Release Zulip Server 4.10.

TestMaybeSendToRegistration needs tweaking here, because it wasn't
setting the subdomain for the dummy request, so
maybe_send_to_registration was actually running with realm=None, which
is not right for these tests.

Also, test_sso_only_when_preregistration_user_exists was creating
PreregistrationUser without setting the realm, which was also incorrect.

.editorconfig

@@ -17,7 +17,7 @@ max_line_length = 100
 [*.{py,pyi}]
 max_line_length = 110
 
-[*.{svg,rb,pp,yaml,yml}]
+[*.{md,svg,rb,pp,yaml,yml}]
 indent_size = 2
 
 [package.json]

.github/pull_request_template.md

@@ -1,14 +1,11 @@
 <!-- What's this PR for?  (Just a link to an issue is fine.) -->
 
-
 **Testing plan:** <!-- How have you tested? -->
 
-
 **GIFs or screenshots:** <!-- If a UI change.  See:
   https://zulip.readthedocs.io/en/latest/tutorials/screenshot-and-gif-software.html
   -->
 
-
 <!-- Also be sure to make clear, coherent commits:
   https://zulip.readthedocs.io/en/latest/contributing/version-control.html
   -->

.github/workflows/cancel-previous-runs.yml

@@ -22,6 +22,7 @@ jobs:
       # so this is required.
       - name: Get workflow IDs.
         id: workflow_ids
+        continue-on-error: true # Don't fail this job on failure
         env:
           # This is in <owner>/<repo> format e.g. zulip/zulip
           REPOSITORY: ${{ github.repository }}
@@ -35,7 +36,8 @@ jobs:
           ids=$(node -e "$script")
           echo "::set-output name=ids::$ids"
 
-      - uses: styfle/cancel-workflow-action@0.4.1
+      - uses: styfle/cancel-workflow-action@0.9.0
+        continue-on-error: true # Don't fail this job on failure
         with:
           workflow_id: ${{ steps.workflow_ids.outputs.ids }}
           access_token: ${{ github.token }}

.github/workflows/codeql-analysis.yml

@@ -4,6 +4,7 @@ on: [push, pull_request]
 
 jobs:
   CodeQL:
+    if: ${{!github.event.repository.private}}
     runs-on: ubuntu-latest
 
     steps:

.github/workflows/legacy-os.yml

@@ -1,24 +0,0 @@
-name: Legacy OS
-
-on: [push, pull_request]
-
-jobs:
-  xenial:
-    name: Ubuntu 16.04 Xenial (Python 3.5, legacy)
-    runs-on: ubuntu-16.04
-    steps:
-      - uses: actions/checkout@v2
-      - name: Check tools/provision error message on xenial
-        run: |
-          { { ! tools/provision 2>&1 >&3; } | tee provision.err; } 3>&1 >&2
-          grep -Fqx 'Error: ubuntu 16.04 is no longer a supported platform for Zulip.' provision.err
-      - name: Check scripts/lib/upgrade-zulip-stage-2 error message on xenial
-        run: |
-          { { ! sudo scripts/lib/upgrade-zulip-stage-2 2>&1 >&3; } | tee upgrade.err; } 3>&1 >&2
-          grep -Fq 'upgrade-zulip-stage-2: Unsupported platform: ubuntu 16.04' upgrade.err
-
-      - name: Report status
-        if: failure()
-        env:
-          ZULIP_BOT_KEY: ${{ secrets.ZULIP_BOT_KEY }}
-        run: tools/ci/send-failure-message

.github/workflows/production-suite.yml

@@ -30,6 +30,8 @@ defaults:
 
 jobs:
   production_build:
+    # This job builds a release tarball from the current commit, which
+    # will be used for all of the following install/upgrade tests.
     name: Bionic production build
     runs-on: ubuntu-latest
 
@@ -66,22 +68,22 @@ jobs:
         uses: actions/cache@v2
         with:
           path: /srv/zulip-npm-cache
-          key: v1-yarn-deps-${{ github.job }}-${{ hashFiles('package.json') }}-${{ hashFiles('yarn.lock') }}
-          restore-keys: v1-yarn-deps-${{ github.job }}
+          key: v1-yarn-deps-bionic-${{ hashFiles('package.json') }}-${{ hashFiles('yarn.lock') }}
+          restore-keys: v1-yarn-deps-bionic
 
       - name: Restore python cache
         uses: actions/cache@v2
         with:
           path: /srv/zulip-venv-cache
-          key: v1-venv-${{ github.job }}-${{ hashFiles('requirements/dev.txt') }}
-          restore-keys: v1-venv-${{ github.job }}
+          key: v1-venv-bionic-${{ hashFiles('requirements/dev.txt') }}
+          restore-keys: v1-venv-bionic
 
       - name: Restore emoji cache
         uses: actions/cache@v2
         with:
           path: /srv/zulip-emoji-cache
-          key: v1-emoji-${{ github.job }}-${{ hashFiles('tools/setup/emoji/emoji_map.json') }}-${{ hashFiles('tools/setup/emoji/build_emoji') }}-${{ hashFiles('tools/setup/emoji/emoji_setup_utils.py') }}-${{ hashFiles('tools/setup/emoji/emoji_names.py') }}-${{ hashFiles('package.json') }}
-          restore-keys: v1-emoji-${{ github.job }}
+          key: v1-emoji-bionic-${{ hashFiles('tools/setup/emoji/emoji_map.json') }}-${{ hashFiles('tools/setup/emoji/build_emoji') }}-${{ hashFiles('tools/setup/emoji/emoji_setup_utils.py') }}-${{ hashFiles('tools/setup/emoji/emoji_names.py') }}-${{ hashFiles('package.json') }}
+          restore-keys: v1-emoji-bionic
 
       - name: Do Bionic hack
         run: |
@@ -106,6 +108,9 @@ jobs:
         run: tools/ci/send-failure-message
 
   production_install:
+    # This job installs the server release tarball built above on a
+    # range of platforms, and does some basic health checks on the
+    # resulting installer Zulip server.
     strategy:
       fail-fast: false
       matrix:
@@ -133,7 +138,9 @@ jobs:
             os: bullseye
 
     name: ${{ matrix.name  }}
-    container: ${{ matrix.docker_image }}
+    container:
+      image: ${{ matrix.docker_image }}
+      options: --init
     runs-on: ubuntu-latest
     needs: production_build
 
@@ -206,3 +213,63 @@ jobs:
         env:
           ZULIP_BOT_KEY: ${{ secrets.ZULIP_BOT_KEY }}
         run: /tmp/send-failure-message
+
+  production_upgrade:
+    # The production upgrade job starts with a container with a
+    # previous Zulip release installed, and attempts to upgrade it to
+    # the release tarball built for the current commit being tested.
+    #
+    # This is intended to catch bugs that result in the upgrade
+    # process failing.
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Base images are built using `tools/ci/Dockerfile.prod.template`.
+          # The comments at the top explain how to build and upload these images.
+          - docker_image: zulip/ci:buster-3.4
+            name: 3.4 Version Upgrade
+            is_focal: true
+            os: buster
+
+    name: ${{ matrix.name  }}
+    container:
+      image: ${{ matrix.docker_image }}
+      options: --init
+    runs-on: ubuntu-latest
+    needs: production_build
+
+    steps:
+      - name: Download built production tarball
+        uses: actions/download-artifact@v2
+        with:
+          name: production-tarball
+          path: /tmp
+
+      - name: Add required permissions and setup
+        run: |
+          # This is the GitHub Actions specific cache directory the
+          # the current github user must be able to access for the
+          # cache action to work. It is owned by root currently.
+          sudo chmod -R 0777 /__w/_temp/
+
+          # Since actions/download-artifact@v2 loses all the permissions
+          # of the tarball uploaded by the upload artifact fix those.
+          chmod +x /tmp/production-upgrade
+          chmod +x /tmp/production-verify
+          chmod +x /tmp/send-failure-message
+
+      - name: Upgrade production
+        run: sudo /tmp/production-upgrade
+
+        # TODO: We should be running production-verify here, but it
+        # doesn't pass yet.
+        #
+        # - name: Verify install
+        #   run: sudo /tmp/production-verify
+
+      - name: Report status
+        if: failure()
+        env:
+          ZULIP_BOT_KEY: ${{ secrets.ZULIP_BOT_KEY }}
+        run: /tmp/send-failure-message

.prettierignore

@@ -1,6 +1,8 @@
 /corporate/tests/stripe_fixtures
 /locale
 /static/third
+/templates/**/*.md
 /tools/setup/emoji/emoji_map.json
 /zerver/tests/fixtures
+/zerver/webhooks/*/doc.md
 /zerver/webhooks/*/fixtures

CODE_OF_CONDUCT.md

@@ -18,15 +18,15 @@ all of us and the technical communities in which we participate.
 
 The following behaviors are expected and requested of all community members:
 
-* Participate. In doing so, you contribute to the health and longevity of
+- Participate. In doing so, you contribute to the health and longevity of
   the community.
-* Exercise consideration and respect in your speech and actions.
-* Attempt collaboration before conflict. Assume good faith.
-* Refrain from demeaning, discriminatory, or harassing behavior and speech.
-* Take action or alert community leaders if you notice a dangerous
+- Exercise consideration and respect in your speech and actions.
+- Attempt collaboration before conflict. Assume good faith.
+- Refrain from demeaning, discriminatory, or harassing behavior and speech.
+- Take action or alert community leaders if you notice a dangerous
   situation, someone in distress, or violations of this code, even if they
   seem inconsequential.
-* Community event venues may be shared with members of the public; be
+- Community event venues may be shared with members of the public; be
   respectful to all patrons of these locations.
 
 ## Unacceptable behavior
@@ -34,24 +34,24 @@ The following behaviors are expected and requested of all community members:
 The following behaviors are considered harassment and are unacceptable
 within the Zulip community:
 
-* Jokes or derogatory language that singles out members of any race,
+- Jokes or derogatory language that singles out members of any race,
   ethnicity, culture, national origin, color, immigration status, social and
   economic class, educational level, language proficiency, sex, sexual
   orientation, gender identity and expression, age, size, family status,
   political belief, religion, and mental and physical ability.
-* Violence, threats of violence, or violent language directed against
+- Violence, threats of violence, or violent language directed against
   another person.
-* Disseminating or threatening to disseminate another person's personal
+- Disseminating or threatening to disseminate another person's personal
   information.
-* Personal insults of any sort.
-* Posting or displaying sexually explicit or violent material.
-* Inappropriate photography or recording.
-* Deliberate intimidation, stalking, or following (online or in person).
-* Unwelcome sexual attention. This includes sexualized comments or jokes,
+- Personal insults of any sort.
+- Posting or displaying sexually explicit or violent material.
+- Inappropriate photography or recording.
+- Deliberate intimidation, stalking, or following (online or in person).
+- Unwelcome sexual attention. This includes sexualized comments or jokes,
   inappropriate touching or groping, and unwelcomed sexual advances.
-* Sustained disruption of community events, including talks and
+- Sustained disruption of community events, including talks and
   presentations.
-* Advocating for, or encouraging, any of the behaviors above.
+- Advocating for, or encouraging, any of the behaviors above.
 
 ## Reporting and enforcement
 

CONTRIBUTING.md

@@ -26,29 +26,30 @@ To make a code or documentation contribution, read our
 [step-by-step guide](#your-first-codebase-contribution) to getting
 started with the Zulip codebase. A small sample of the type of work that
 needs doing:
-* Bug squashing and feature development on our Python/Django
+
+- Bug squashing and feature development on our Python/Django
   [backend](https://github.com/zulip/zulip), web
   [frontend](https://github.com/zulip/zulip), React Native
   [mobile app](https://github.com/zulip/zulip-mobile), or Electron
   [desktop app](https://github.com/zulip/zulip-desktop).
-* Building out our
+- Building out our
   [Python API and bots](https://github.com/zulip/python-zulip-api) framework.
-* [Writing an integration](https://zulip.com/api/integrations-overview).
-* Improving our [user](https://zulip.com/help/) or
+- [Writing an integration](https://zulip.com/api/integrations-overview).
+- Improving our [user](https://zulip.com/help/) or
   [developer](https://zulip.readthedocs.io/en/latest/) documentation.
-* [Reviewing code](https://zulip.readthedocs.io/en/latest/contributing/code-reviewing.html)
+- [Reviewing code](https://zulip.readthedocs.io/en/latest/contributing/code-reviewing.html)
   and manually testing pull requests.
 
 **Non-code contributions**: Some of the most valuable ways to contribute
 don't require touching the codebase at all. We list a few of them below:
 
-* [Reporting issues](#reporting-issues), including both feature requests and
+- [Reporting issues](#reporting-issues), including both feature requests and
   bug reports.
-* [Giving feedback](#user-feedback) if you are evaluating or using Zulip.
-* [Sponsor Zulip](https://github.com/sponsors/zulip) through the GitHub sponsors program.
-* [Translating](https://zulip.readthedocs.io/en/latest/translating/translating.html)
+- [Giving feedback](#user-feedback) if you are evaluating or using Zulip.
+- [Sponsor Zulip](https://github.com/sponsors/zulip) through the GitHub sponsors program.
+- [Translating](https://zulip.readthedocs.io/en/latest/translating/translating.html)
   Zulip.
-* [Outreach](#zulip-outreach): Star us on GitHub, upvote us
+- [Outreach](#zulip-outreach): Star us on GitHub, upvote us
   on product comparison sites, or write for [the Zulip blog](https://blog.zulip.org/).
 
 ## Your first (codebase) contribution
@@ -57,7 +58,8 @@ This section has a step by step guide to starting as a Zulip codebase
 contributor. It's long, but don't worry about doing all the steps perfectly;
 no one gets it right the first time, and there are a lot of people available
 to help.
-* First, make an account on the
+
+- First, make an account on the
   [Zulip community server](https://zulip.readthedocs.io/en/latest/contributing/chat-zulip-org.html),
   paying special attention to the community norms. If you'd like, introduce
   yourself in
@@ -65,17 +67,17 @@ to help.
   your name as the topic. Bonus: tell us about your first impressions of
   Zulip, and anything that felt confusing/broken as you started using the
   product.
-* Read [What makes a great Zulip contributor](#what-makes-a-great-zulip-contributor).
-* [Install the development environment](https://zulip.readthedocs.io/en/latest/development/overview.html),
+- Read [What makes a great Zulip contributor](#what-makes-a-great-zulip-contributor).
+- [Install the development environment](https://zulip.readthedocs.io/en/latest/development/overview.html),
   getting help in
   [#development help](https://chat.zulip.org/#narrow/stream/49-development-help)
   if you run into any troubles.
-* Read the
+- Read the
   [Zulip guide to Git](https://zulip.readthedocs.io/en/latest/git/index.html)
   and do the Git tutorial (coming soon) if you are unfamiliar with
   Git, getting help in
   [#git help](https://chat.zulip.org/#narrow/stream/44-git-help) if
-  you run into any troubles.  Be sure to check out the
+  you run into any troubles. Be sure to check out the
   [extremely useful Zulip-specific tools page](https://zulip.readthedocs.io/en/latest/git/zulip-tools.html).
 
 ### Picking an issue
@@ -84,7 +86,7 @@ Now, you're ready to pick your first issue! There are hundreds of open issues
 in the main codebase alone. This section will help you find an issue to work
 on.
 
-* If you're interested in
+- If you're interested in
   [mobile](https://github.com/zulip/zulip-mobile/issues?q=is%3Aopen+is%3Aissue),
   [desktop](https://github.com/zulip/zulip-desktop/issues?q=is%3Aopen+is%3Aissue),
   or
@@ -93,18 +95,18 @@ on.
   [#mobile](https://chat.zulip.org/#narrow/stream/48-mobile),
   [#desktop](https://chat.zulip.org/#narrow/stream/16-desktop), or
   [#integration](https://chat.zulip.org/#narrow/stream/127-integrations).
-* For the main server and web repository, we recommend browsing
+- For the main server and web repository, we recommend browsing
   recently opened issues to look for issues you are confident you can
   fix correctly in a way that clearly communicates why your changes
-  are the correct fix.  Our GitHub workflow bot, zulipbot, limits
+  are the correct fix. Our GitHub workflow bot, zulipbot, limits
   users who have 0 commits merged to claiming a single issue labeled
   with "good first issue" or "help wanted".
-* We also partition all of our issues in the main repo into areas like
+- We also partition all of our issues in the main repo into areas like
   admin, compose, emoji, hotkeys, i18n, onboarding, search, etc. Look
   through our [list of labels](https://github.com/zulip/zulip/labels), and
   click on some of the `area:` labels to see all the issues related to your
   areas of interest.
-* If the lists of issues are overwhelming, post in
+- If the lists of issues are overwhelming, post in
   [#new members](https://chat.zulip.org/#narrow/stream/95-new-members) with a
   bit about your background and interests, and we'll help you out. The most
   important thing to say is whether you're looking for a backend (Python),
@@ -119,21 +121,22 @@ have a new feature you'd like to add, we recommend you start by posting in
 feature idea and the problem that you're hoping to solve.
 
 Other notes:
-* For a first pull request, it's better to aim for a smaller contribution
+
+- For a first pull request, it's better to aim for a smaller contribution
   than a bigger one. Many first contributions have fewer than 10 lines of
   changes (not counting changes to tests).
-* The full list of issues explicitly looking for a contributor can be
+- The full list of issues explicitly looking for a contributor can be
   found with the
   [good first issue](https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22)
   and
   [help wanted](https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22)
-  labels.  Avoid issues with the "difficult" label unless you
+  labels. Avoid issues with the "difficult" label unless you
   understand why it is difficult and are confident you can resolve the
-  issue correctly and completely.  Issues without one of these labels
+  issue correctly and completely. Issues without one of these labels
   are fair game if Tim has written a clear technical design proposal
   in the issue, or it is a bug that you can reproduce and you are
   confident you can fix the issue correctly.
-* For most new contributors, there's a lot to learn while making your first
+- For most new contributors, there's a lot to learn while making your first
   pull request. It's OK if it takes you a while; that's normal! You'll be
   able to work a lot faster as you build experience.
 
@@ -144,20 +147,20 @@ the issue thread. [Zulipbot](https://github.com/zulip/zulipbot) is a GitHub
 workflow bot; it will assign you to the issue and label the issue as "in
 progress". Some additional notes:
 
-* You can only claim issues with the
+- You can only claim issues with the
   [good first issue](https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22)
   or
   [help wanted](https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22)
   labels. Zulipbot will give you an error if you try to claim an issue
   without one of those labels.
-* You're encouraged to ask questions on how to best implement or debug your
+- You're encouraged to ask questions on how to best implement or debug your
   changes -- the Zulip maintainers are excited to answer questions to help
   you stay unblocked and working efficiently. You can ask questions on
   chat.zulip.org, or on the GitHub issue or pull request.
-* We encourage early pull requests for work in progress. Prefix the title of
+- We encourage early pull requests for work in progress. Prefix the title of
   work in progress pull requests with `[WIP]`, and remove the prefix when
   you think it might be mergeable and want it to be reviewed.
-* After updating a PR, add a comment to the GitHub thread mentioning that it
+- After updating a PR, add a comment to the GitHub thread mentioning that it
   is ready for another review. GitHub only notifies maintainers of the
   changes when you post a comment, so if you don't, your PR will likely be
   neglected by accident!
@@ -172,26 +175,26 @@ labels.
 
 ## What makes a great Zulip contributor?
 
-Zulip has a lot of experience working with new contributors.  In our
+Zulip has a lot of experience working with new contributors. In our
 experience, these are the best predictors of success:
 
-* Posting good questions. This generally means explaining your current
+- Posting good questions. This generally means explaining your current
   understanding, saying what you've done or tried so far, and including
   tracebacks or other error messages if appropriate.
-* Learning and practicing
+- Learning and practicing
   [Git commit discipline](https://zulip.readthedocs.io/en/latest/contributing/version-control.html#commit-discipline).
-* Submitting carefully tested code. This generally means checking your work
+- Submitting carefully tested code. This generally means checking your work
   through a combination of automated tests and manually clicking around the
   UI trying to find bugs in your work. See
   [things to look for](https://zulip.readthedocs.io/en/latest/contributing/code-reviewing.html#things-to-look-for)
   for additional ideas.
-* Posting
+- Posting
   [screenshots or GIFs](https://zulip.readthedocs.io/en/latest/tutorials/screenshot-and-gif-software.html)
   for frontend changes.
-* Being responsive to feedback on pull requests. This means incorporating or
+- Being responsive to feedback on pull requests. This means incorporating or
   responding to all suggested changes, and leaving a note if you won't be
   able to address things within a few days.
-* Being helpful and friendly on chat.zulip.org.
+- Being helpful and friendly on chat.zulip.org.
 
 These are also the main criteria we use to select candidates for all
 of our outreach programs.
@@ -215,9 +218,9 @@ and how to reproduce it if known, your browser/OS if relevant, and a
 if appropriate.
 
 **Reporting security issues**. Please do not report security issues
-  publicly, including on public streams on chat.zulip.org. You can
-  email security@zulip.com.  We create a CVE for every security
-  issue in our released software.
+publicly, including on public streams on chat.zulip.org. You can
+email security@zulip.com. We create a CVE for every security
+issue in our released software.
 
 ## User feedback
 
@@ -227,17 +230,17 @@ hear about your experience with the product. If you're not sure what to
 write, here are some questions we're always very curious to know the answer
 to:
 
-* Evaluation: What is the process by which your organization chose or will
+- Evaluation: What is the process by which your organization chose or will
   choose a group chat product?
-* Pros and cons: What are the pros and cons of Zulip for your organization,
+- Pros and cons: What are the pros and cons of Zulip for your organization,
   and the pros and cons of other products you are evaluating?
-* Features: What are the features that are most important for your
+- Features: What are the features that are most important for your
   organization? In the best-case scenario, what would your chat solution do
   for you?
-* Onboarding: If you remember it, what was your impression during your first
+- Onboarding: If you remember it, what was your impression during your first
   few minutes of using Zulip? What did you notice, and how did you feel? Was
   there anything that stood out to you as confusing, or broken, or great?
-* Organization: What does your organization do? How big is the organization?
+- Organization: What does your organization do? How big is the organization?
   A link to your organization's website?
 
 ## Outreach programs
@@ -252,15 +255,16 @@ summer interns from Harvard, MIT, and Stanford.
 While each third-party program has its own rules and requirements, the
 Zulip community's approaches all of these programs with these ideas in
 mind:
-* We try to make the application process as valuable for the applicant as
+
+- We try to make the application process as valuable for the applicant as
   possible. Expect high-quality code reviews, a supportive community, and
   publicly viewable patches you can link to from your resume, regardless of
   whether you are selected.
-* To apply, you'll have to submit at least one pull request to a Zulip
-  repository.  Most students accepted to one of our programs have
+- To apply, you'll have to submit at least one pull request to a Zulip
+  repository. Most students accepted to one of our programs have
   several merged pull requests (including at least one larger PR) by
   the time of the application deadline.
-* The main criteria we use is quality of your best contributions, and
+- The main criteria we use is quality of your best contributions, and
   the bullets listed at
   [What makes a great Zulip contributor](#what-makes-a-great-zulip-contributor).
   Because we focus on evaluating your best work, it doesn't hurt your
@@ -274,7 +278,7 @@ important parts of the project. We hope you apply!
 ### Google Summer of Code
 
 The largest outreach program Zulip participates in is GSoC (14
-students in 2017; 11 in 2018; 17 in 2019; 18 in 2020).  While we don't control how
+students in 2017; 11 in 2018; 17 in 2019; 18 in 2020). While we don't control how
 many slots Google allocates to Zulip, we hope to mentor a similar
 number of students in future summers.
 
@@ -282,9 +286,9 @@ If you're reading this well before the application deadline and want
 to make your application strong, we recommend getting involved in the
 community and fixing issues in Zulip now. Having good contributions
 and building a reputation for doing good work is the best way to have
-a strong application.  About half of Zulip's GSoC students for Summer
+a strong application. About half of Zulip's GSoC students for Summer
 2017 had made significant contributions to the project by February
-2017, and about half had not.  Our
+2017, and about half had not. Our
 [GSoC project ideas page][gsoc-guide] has lots more details on how
 Zulip does GSoC, as well as project ideas (though the project idea
 list is maintained only during the GSoC application period, so if
@@ -293,9 +297,9 @@ out-of-date).
 
 We also have in some past years run a Zulip Summer of Code (ZSoC)
 program for students who we didn't have enough slots to accept for
-GSoC but were able to find funding for.  Student expectations are the
+GSoC but were able to find funding for. Student expectations are the
 same as with GSoC, and it has no separate application process; your
-GSoC application is your ZSoC application.  If we'd like to select you
+GSoC application is your ZSoC application. If we'd like to select you
 for ZSoC, we'll contact you when the GSoC results are announced.
 
 [gsoc-guide]: https://zulip.readthedocs.io/en/latest/contributing/gsoc-ideas.html
@@ -307,23 +311,24 @@ for ZSoC, we'll contact you when the GSoC results are announced.
 perception of projects like Zulip. We've collected a few sites below
 where we know Zulip has been discussed. Doing everything in the following
 list typically takes about 15 minutes.
-* Star us on GitHub. There are four main repositories:
+
+- Star us on GitHub. There are four main repositories:
   [server/web](https://github.com/zulip/zulip),
   [mobile](https://github.com/zulip/zulip-mobile),
   [desktop](https://github.com/zulip/zulip-desktop), and
   [Python API](https://github.com/zulip/python-zulip-api).
-* [Follow us](https://twitter.com/zulip) on Twitter.
+- [Follow us](https://twitter.com/zulip) on Twitter.
 
 For both of the following, you'll need to make an account on the site if you
 don't already have one.
 
-* [Like Zulip](https://alternativeto.net/software/zulip-chat-server/) on
+- [Like Zulip](https://alternativeto.net/software/zulip-chat-server/) on
   AlternativeTo. We recommend upvoting a couple of other products you like
   as well, both to give back to their community, and since single-upvote
   accounts are generally given less weight. You can also
   [upvote Zulip](https://alternativeto.net/software/slack/) on their page
   for Slack.
-* [Add Zulip to your stack](https://stackshare.io/zulip) on StackShare, star
+- [Add Zulip to your stack](https://stackshare.io/zulip) on StackShare, star
   it, and upvote the reasons why people like Zulip that you find most
   compelling. Again, we recommend adding a few other products that you like
   as well.

README.md

@@ -8,8 +8,8 @@ allows users to easily process hundreds or thousands of messages a day. With
 over 700 contributors merging over 500 commits a month, Zulip is also the
 largest and fastest growing open source group chat project.
 
-[![GitHub Actions build status](https://github.com/zulip/zulip/actions/workflows/zulip-ci.yml/badge.svg?branch=master)](https://github.com/zulip/zulip/actions/workflows/zulip-ci.yml?query=branch%3Amaster)
-[![coverage status](https://img.shields.io/codecov/c/github/zulip/zulip/master.svg)](https://codecov.io/gh/zulip/zulip/branch/master)
+[![GitHub Actions build status](https://github.com/zulip/zulip/actions/workflows/zulip-ci.yml/badge.svg)](https://github.com/zulip/zulip/actions/workflows/zulip-ci.yml?query=branch%3Amain)
+[![coverage status](https://img.shields.io/codecov/c/github/zulip/zulip/main.svg)](https://codecov.io/gh/zulip/zulip)
 [![Mypy coverage](https://img.shields.io/badge/mypy-100%25-green.svg)][mypy-coverage]
 [![code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
@@ -30,13 +30,13 @@ and tell us what's up!
 
 You might be interested in:
 
-* **Contributing code**. Check out our
+- **Contributing code**. Check out our
   [guide for new contributors](https://zulip.readthedocs.io/en/latest/overview/contributing.html)
-  to get started.  Zulip prides itself on maintaining a clean and
+  to get started. Zulip prides itself on maintaining a clean and
   well-tested codebase, and a stock of hundreds of
   [beginner-friendly issues][beginner-friendly].
 
-* **Contributing non-code**.
+- **Contributing non-code**.
   [Report an issue](https://zulip.readthedocs.io/en/latest/overview/contributing.html#reporting-issues),
   [translate](https://zulip.readthedocs.io/en/latest/translating/translating.html) Zulip
   into your language,
@@ -45,12 +45,12 @@ You might be interested in:
   [give us feedback](https://zulip.readthedocs.io/en/latest/overview/contributing.html#user-feedback). We
   would love to hear from you, even if you're just trying the product out.
 
-* **Supporting Zulip**. Advocate for your organization to use Zulip, become a [sponsor](https://github.com/sponsors/zulip), write a
+- **Supporting Zulip**. Advocate for your organization to use Zulip, become a [sponsor](https://github.com/sponsors/zulip), write a
   review in the mobile app stores, or
   [upvote Zulip](https://zulip.readthedocs.io/en/latest/overview/contributing.html#zulip-outreach) on
   product comparison sites.
 
-* **Checking Zulip out**. The best way to see Zulip in action is to drop by
+- **Checking Zulip out**. The best way to see Zulip in action is to drop by
   the
   [Zulip community server](https://zulip.readthedocs.io/en/latest/contributing/chat-zulip-org.html). We
   also recommend reading Zulip for
@@ -58,23 +58,23 @@ You might be interested in:
   [companies](https://zulip.com/for/companies/), or Zulip for
   [working groups and part time communities](https://zulip.com/for/working-groups-and-communities/).
 
-* **Running a Zulip server**. Use a preconfigured [DigitalOcean droplet](https://marketplace.digitalocean.com/apps/zulip),
+- **Running a Zulip server**. Use a preconfigured [DigitalOcean droplet](https://marketplace.digitalocean.com/apps/zulip),
   [install Zulip](https://zulip.readthedocs.io/en/stable/production/install.html)
   directly, or use Zulip's
   experimental [Docker image](https://zulip.readthedocs.io/en/latest/production/deployment.html#zulip-in-docker).
   Commercial support is available; see <https://zulip.com/plans> for details.
 
-* **Using Zulip without setting up a server**. <https://zulip.com>
+- **Using Zulip without setting up a server**. <https://zulip.com>
   offers free and commercial hosting, including providing our paid
   plan for free to fellow open source projects.
 
-* **Participating in [outreach
+- **Participating in [outreach
   programs](https://zulip.readthedocs.io/en/latest/overview/contributing.html#outreach-programs)**
   like Google Summer of Code.
 
 You may also be interested in reading our [blog](https://blog.zulip.org/) or
 following us on [Twitter](https://twitter.com/zulip).
 Zulip is distributed under the
-[Apache 2.0](https://github.com/zulip/zulip/blob/master/LICENSE) license.
+[Apache 2.0](https://github.com/zulip/zulip/blob/main/LICENSE) license.
 
 [beginner-friendly]: https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

SECURITY.md

@@ -8,7 +8,7 @@ so you should subscribe if you are running Zulip in production.
 We love responsible reports of (potential) security issues in Zulip,
 whether in the latest release or our development branch.
 
-Our security contact is security@zulip.com.  Reporters should expect a
+Our security contact is security@zulip.com. Reporters should expect a
 response within 24 hours.
 
 Please include details on the issue and how you'd like to be credited

confirmation/models.py

@@ -34,10 +34,10 @@ def render_confirmation_key_error(
     request: HttpRequest, exception: ConfirmationKeyException
 ) -> HttpResponse:
     if exception.error_type == ConfirmationKeyException.WRONG_LENGTH:
-        return render(request, "confirmation/link_malformed.html")
+        return render(request, "confirmation/link_malformed.html", status=404)
     if exception.error_type == ConfirmationKeyException.EXPIRED:
-        return render(request, "confirmation/link_expired.html")
-    return render(request, "confirmation/link_does_not_exist.html")
+        return render(request, "confirmation/link_expired.html", status=404)
+    return render(request, "confirmation/link_does_not_exist.html", status=404)
 
 
 def generate_key() -> str:
@@ -143,9 +143,9 @@ class ConfirmationType:
 
 
 _properties = {
-    Confirmation.USER_REGISTRATION: ConfirmationType("check_prereg_key_and_redirect"),
+    Confirmation.USER_REGISTRATION: ConfirmationType("get_prereg_key_and_redirect"),
     Confirmation.INVITATION: ConfirmationType(
-        "check_prereg_key_and_redirect", validity_in_days=settings.INVITATION_LINK_VALIDITY_DAYS
+        "get_prereg_key_and_redirect", validity_in_days=settings.INVITATION_LINK_VALIDITY_DAYS
     ),
     Confirmation.EMAIL_CHANGE: ConfirmationType("confirm_email_change"),
     Confirmation.UNSUBSCRIBE: ConfirmationType(
@@ -155,7 +155,7 @@ _properties = {
     Confirmation.MULTIUSE_INVITE: ConfirmationType(
         "join", validity_in_days=settings.INVITATION_LINK_VALIDITY_DAYS
     ),
-    Confirmation.REALM_CREATION: ConfirmationType("check_prereg_key_and_redirect"),
+    Confirmation.REALM_CREATION: ConfirmationType("get_prereg_key_and_redirect"),
     Confirmation.REALM_REACTIVATION: ConfirmationType("realm_reactivation"),
 }
 

docs/conf.py

@@ -12,7 +12,7 @@
 # serve to show the default.
 import os
 import sys
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, Optional
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -20,7 +20,7 @@ from typing import Any, Dict, List, Optional
 # sys.path.insert(0, os.path.abspath('.'))
 
 sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
-from version import ZULIP_VERSION
+from version import LATEST_RELEASE_VERSION, ZULIP_VERSION
 
 # -- General configuration ------------------------------------------------
 
@@ -30,7 +30,14 @@ from version import ZULIP_VERSION
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions: List[str] = []
+extensions = [
+    "myst_parser",
+]
+
+myst_enable_extensions = [
+    "colon_fence",
+    "substitution",
+]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]
@@ -99,6 +106,10 @@ pygments_style = "sphinx"
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = False
 
+myst_substitutions = {
+    "LATEST_RELEASE_VERSION": LATEST_RELEASE_VERSION,
+}
+
 
 # -- Options for HTML output ----------------------------------------------
 
@@ -293,8 +304,6 @@ texinfo_documents = [
 # If true, do not generate a @detailmenu in the "Top" node's menu.
 # texinfo_no_detailmenu = False
 
-from recommonmark.transform import AutoStructify
-
 # The suffix(es) of source filenames. You can specify multiple suffix
 # as a dictionary mapping file extensions to file types
 # https://www.sphinx-doc.org/en/master/usage/markdown.html
@@ -303,39 +312,11 @@ source_suffix = {
     ".md": "markdown",
 }
 
-# Temporary workaround to remove multiple build warnings caused by upstream bug.
-# See https://github.com/zulip/zulip/issues/13263 for details.
-from commonmark.node import Node
-from recommonmark.parser import CommonMarkParser
-
-
-class CustomCommonMarkParser(CommonMarkParser):
-    def visit_document(self, node: Node) -> None:
-        pass
+suppress_warnings = [
+    "myst.header",
+]
 
 
 def setup(app: Any) -> None:
-
-    app.add_source_parser(CustomCommonMarkParser)
-    app.add_config_value(
-        "recommonmark_config",
-        {
-            "enable_eval_rst": True,
-            # Turn off recommonmark features we aren't using.
-            "enable_auto_doc_ref": False,
-            "auto_toc_tree_section": None,
-            "enable_auto_toc_tree": False,
-            "enable_math": False,
-            "enable_inline_math": False,
-            "url_resolver": lambda x: x,
-        },
-        True,
-    )
-
-    # Enable `eval_rst`, and any other features enabled in recommonmark_config.
-    # Docs: https://recommonmark.readthedocs.io/en/latest/auto_structify.html
-    # (But NB those docs are for master, not latest release.)
-    app.add_transform(AutoStructify)
-
     # overrides for wide tables in RTD theme
     app.add_css_file("theme_overrides.css")  # path relative to _static

docs/contributing/accessibility.md

@@ -3,24 +3,24 @@
 ## Guidelines
 
 In order to accommodate all users, Zulip strives to implement accessibility
-best practices in its user interface.  There are many aspects to accessibility;
+best practices in its user interface. There are many aspects to accessibility;
 here are some of the more important ones to keep in mind.
 
-* All images should have alternative text attributes for the benefit of users
+- All images should have alternative text attributes for the benefit of users
   who cannot see them (this includes users who are utilizing a voice interface
   to free up their eyes to look at something else instead).
-* The entire application should be usable via a keyboard (many users are unable
+- The entire application should be usable via a keyboard (many users are unable
   to use a mouse, and many accessibility aids emulate a keyboard).
-* Text should have good enough contrast against the background to enable
+- Text should have good enough contrast against the background to enable
   even users with moderate visual impairment to be able to read it.
-* [ARIA](https://www.w3.org/WAI/intro/aria) (Accessible Rich Internet
+- [ARIA](https://www.w3.org/WAI/intro/aria) (Accessible Rich Internet
   Application) attributes should be used appropriately to enable screen
   readers and other alternative interfaces to navigate the application
   effectively.
 
 There are many different standards for accessibility, but the most relevant
 one for Zulip is the W3C's [WCAG](https://www.w3.org/TR/WCAG20/) (Web Content
-Accessibility Guidelines), currently at version 2.0.  Whenever practical, we
+Accessibility Guidelines), currently at version 2.0. Whenever practical, we
 should strive for compliance with the AA level of this specification.
 (The W3C itself
 [recommends not trying](https://www.w3.org/TR/UNDERSTANDING-WCAG20/conformance.html#uc-conf-req1-head)
@@ -30,26 +30,26 @@ as it is not possible for some content.)
 ## Tools
 
 There are tools available to automatically audit a web page for compliance
-with many of the WCAG guidelines.  Here are some of the more useful ones:
+with many of the WCAG guidelines. Here are some of the more useful ones:
 
-* [Accessibility Developer Tools][chrome-webstore]
+- [Accessibility Developer Tools][chrome-webstore]
   This open source Chrome extension from Google adds an accessibility audit to
-  the "Audits" tab of the Chrome Developer Tools.  The audit is performed
+  the "Audits" tab of the Chrome Developer Tools. The audit is performed
   against the page's DOM via JavaScript, allowing it to identify some issues
   that a static HTML inspector would miss.
-* [aXe](https://www.deque.com/products/axe/) An open source Chrome and Firefox
+- [aXe](https://www.deque.com/products/axe/) An open source Chrome and Firefox
   extension which runs a somewhat different set of checks than Google's Chrome
   extension.
-* [Wave](https://wave.webaim.org/) This web application takes a URL and loads
+- [Wave](https://wave.webaim.org/) This web application takes a URL and loads
   it in a frame, reporting on all the issues it finds with links to more
-  information.  Has the advantage of not requiring installation, but requires
+  information. Has the advantage of not requiring installation, but requires
   a URL which can be directly accessed by an external site.
-* [Web Developer](https://chrispederick.com/work/web-developer/) This browser
+- [Web Developer](https://chrispederick.com/work/web-developer/) This browser
   extension has many useful features, including a convenient link for opening
   the current URL in Wave to get an accessibility report.
 
 Note that these tools cannot catch all possible accessibility problems, and
-sometimes report false positives as well.  They are a useful aid in quickly
+sometimes report false positives as well. They are a useful aid in quickly
 identifying potential problems and checking for regressions, but their
 recommendations should not be blindly obeyed.
 
@@ -57,10 +57,10 @@ recommendations should not be blindly obeyed.
 
 Problems with Zulip's accessibility should be reported as
 [GitHub issues](https://github.com/zulip/zulip/issues) with the "accessibility"
-label.  This label can be added by entering the following text in a separate
+label. This label can be added by entering the following text in a separate
 comment on the issue:
 
-    @zulipbot add "area: accessibility"
+> @zulipbot add "area: accessibility"
 
 If you want to help make Zulip more accessible, here is a list of the
 [currently open accessibility issues][accessibility-issues].
@@ -70,15 +70,14 @@ If you want to help make Zulip more accessible, here is a list of the
 For more information about making Zulip accessible to as many users as
 possible, the following resources may be useful.
 
-* [Font Awesome accessibility guide](https://fontawesome.com/how-to-use/on-the-web/other-topics/accessibility),
+- [Font Awesome accessibility guide](https://fontawesome.com/how-to-use/on-the-web/other-topics/accessibility),
   which is especially helpful since Zulip uses Font Awesome for its icons.
-* [Web Content Accessibility Guidelines (WCAG) 2.0](https://www.w3.org/TR/WCAG/)
-* [WAI-ARIA](https://www.w3.org/WAI/intro/aria) - Web Accessibility Initiative
+- [Web Content Accessibility Guidelines (WCAG) 2.0](https://www.w3.org/TR/WCAG/)
+- [WAI-ARIA](https://www.w3.org/WAI/intro/aria) - Web Accessibility Initiative
   Accessible Rich Internet Application Suite
-* [WebAIM](https://webaim.org/) - Web Accessibility in Mind
-* The [MDN page on accessibility](https://developer.mozilla.org/en-US/docs/Web/Accessibility)
-* The [Open edX Accessibility Guidelines][openedx-guidelines] for developers
-
+- [WebAIM](https://webaim.org/) - Web Accessibility in Mind
+- The [MDN page on accessibility](https://developer.mozilla.org/en-US/docs/Web/Accessibility)
+- The [Open edX Accessibility Guidelines][openedx-guidelines] for developers
 
 [chrome-webstore]: https://chrome.google.com/webstore/detail/accessibility-developer-t/fpkknkljclfencbdbgkenhalefipecmb
 [openedx-guidelines]: https://edx.readthedocs.io/projects/edx-developer-guide/en/latest/conventions/accessibility.html

docs/contributing/bug-reports.md

@@ -2,21 +2,22 @@
 
 Please include these elements in your bug report to make it easier for us to help you.
 
-* A brief title
+- A brief title
 
-* An explanation of what you were expecting vs. the actual result
+- An explanation of what you were expecting vs. the actual result
 
-* Steps to take in order to reproduce the buggy behavior
+- Steps to take in order to reproduce the buggy behavior
 
-* Whether you are using Zulip in production or in the development
-environment, and whether these are old versions
+- Whether you are using Zulip in production or in the development
+  environment, and whether these are old versions
 
-* Whether you are using the web app, a desktop app or a mobile device
-to access Zulip
+- Whether you are using the web app, a desktop app or a mobile device
+  to access Zulip
 
-* Any additional information that would help: screenshots, GIFs, a
-pastebin of the error log
+- Any additional information that would help: screenshots, GIFs, a
+  pastebin of the error log
 
 Further reading:
-* [How to write a bug report that will make your engineers love you](https://testlio.com/blog/the-ideal-bug-report/)
-* [How to Report Bugs Effectively](https://www.chiark.greenend.org.uk/~sgtatham/bugs.html)
+
+- [How to write a bug report that will make your engineers love you](https://testlio.com/blog/the-ideal-bug-report/)
+- [How to Report Bugs Effectively](https://www.chiark.greenend.org.uk/~sgtatham/bugs.html)

docs/contributing/chat-zulip-org.md

@@ -4,38 +4,38 @@
 forum for the Zulip community.
 
 You can go through the simple signup process at that link, and then
-you will soon be talking to core Zulip developers and other users.  To
+you will soon be talking to core Zulip developers and other users. To
 get help in real time, you will have the best luck finding core
 developers roughly between 17:00 UTC and 6:00 UTC, but the sun never
-sets on the Zulip community.  Most questions get a reply within
+sets on the Zulip community. Most questions get a reply within
 minutes to a few hours, depending on the time of day.
 
 ## Community norms
 
-* Send test messages to
+- Send test messages to
   [#test here](https://chat.zulip.org/#narrow/stream/7-test-here) or
   as a PM to yourself to avoid disturbing others.
-* When asking for help, provide the details needed for others to help
-  you.  E.g. include the full traceback in a code block (not a
+- When asking for help, provide the details needed for others to help
+  you. E.g. include the full traceback in a code block (not a
   screenshot), a link to the code or a WIP PR you're having trouble
   debugging, etc.
-* Ask questions on streams rather than PMing core contributors.
+- Ask questions on streams rather than PMing core contributors.
   You'll get answers faster since other people can help, and it makes
   it possible for other developers to learn from reading the discussion.
-* Use @-mentions sparingly.  Unlike IRC or Slack, in Zulip, it's
+- Use @-mentions sparingly. Unlike IRC or Slack, in Zulip, it's
   usually easy to see which message you're replying to, so you don't
   need to mention your conversation partner in every reply.
   Mentioning other users is great for timely questions or making sure
   someone who is not online sees your message.
-* Converse informally; there's no need to use titles like "Sir" or "Madam".
-* Use
+- Converse informally; there's no need to use titles like "Sir" or "Madam".
+- Use
   [gender-neutral language](https://en.wikipedia.org/wiki/Gender-neutral_language).
   For example, avoid using a pronoun like her or his in sentences like
   "Every developer should clean [their] keyboard at least once a week."
-* Follow the community [code of conduct](../code-of-conduct.md).
-* Participate!  Zulip is a friendly and welcoming community, and we
+- Follow the community [code of conduct](../code-of-conduct.md).
+- Participate! Zulip is a friendly and welcoming community, and we
   love meeting new people, hearing about what brought them to Zulip,
-  and getting their feedback.  If you're not sure where to start,
+  and getting their feedback. If you're not sure where to start,
   introduce yourself and your interests in
   [#new members](https://chat.zulip.org/#narrow/stream/95-new-members),
   using your name as the topic.
@@ -44,7 +44,7 @@ minutes to a few hours, depending on the time of day.
 
 The chat.zulip.org community sends several thousand messages every
 single week, about half of them to streams that we have included in
-the default streams for new users for discoverability.  Keeping up
+the default streams for new users for discoverability. Keeping up
 with **everything** happening in the Zulip project is both difficult
 and rarely a useful goal.
 
@@ -54,9 +54,9 @@ streams that are only of occasional interest.
 
 ## This is a bleeding edge development server
 
-The chat.zulip.org server is frequently deployed off of `master` from
+The chat.zulip.org server is frequently deployed off of `main` from
 the Zulip Git repository, so please point out anything you notice that
-seems wrong!  We catch many bugs that escape code review this way.
+seems wrong! We catch many bugs that escape code review this way.
 
 The chat.zulip.org server is a development and testing server, not a
 production service, so don't use it for anything mission-critical,
@@ -67,59 +67,59 @@ secret/embarrassing, etc.
 There are a few streams worth highlighting that are relevant for
 everyone, even non-developers:
 
-* [#announce](https://chat.zulip.org/#narrow/stream/1-announce) is for
+- [#announce](https://chat.zulip.org/#narrow/stream/1-announce) is for
   announcements and discussions thereof; we try to keep traffic there
   to a minimum.
-* [#feedback](https://chat.zulip.org/#narrow/stream/137-feedback) is for
+- [#feedback](https://chat.zulip.org/#narrow/stream/137-feedback) is for
   posting feedback on Zulip.
-* [#design](https://chat.zulip.org/#narrow/stream/101-design) is where we
+- [#design](https://chat.zulip.org/#narrow/stream/101-design) is where we
   discuss UI and feature design and collect feedback on potential design
-  changes.  We love feedback, so don't hesitate to speak up!
-* [#user community](https://chat.zulip.org/#narrow/stream/138-user-community) is
+  changes. We love feedback, so don't hesitate to speak up!
+- [#user community](https://chat.zulip.org/#narrow/stream/138-user-community) is
   for Zulip users to discuss their experiences using and adopting Zulip.
-* [#production help](https://chat.zulip.org/#narrow/stream/31-production-help)
+- [#production help](https://chat.zulip.org/#narrow/stream/31-production-help)
   is for production environment related discussions.
-* [#test here](https://chat.zulip.org/#narrow/stream/7-test-here) is
+- [#test here](https://chat.zulip.org/#narrow/stream/7-test-here) is
   for sending test messages without inconveniencing other users :).
   We recommend muting this stream when not using it.
 
 There are dozens of streams for development discussions in the Zulip
 community (e.g. one for each app, etc.); check out the
 [Streams page](https://chat.zulip.org/#streams/all) to see the
-descriptions for all of them.  Relevant to almost everyone are these:
+descriptions for all of them. Relevant to almost everyone are these:
 
-* [#checkins](https://chat.zulip.org/#narrow/stream/65-checkins) is for
+- [#checkins](https://chat.zulip.org/#narrow/stream/65-checkins) is for
   progress updates on what you're working on and its status; usually
-  folks post with their name as the topic.  Everyone is welcome to
+  folks post with their name as the topic. Everyone is welcome to
   participate!
-* [#development help](https://chat.zulip.org/#narrow/stream/49-development-help)
+- [#development help](https://chat.zulip.org/#narrow/stream/49-development-help)
   is for asking for help with any Zulip server/webapp development work
   (use the app streams for help working on one of the apps).
-* [#code review](https://chat.zulip.org/#narrow/stream/91-code-review)
-  is for getting feedback on your work.  We encourage all developers
+- [#code review](https://chat.zulip.org/#narrow/stream/91-code-review)
+  is for getting feedback on your work. We encourage all developers
   to comment on work posted here, even if you're new to the Zulip
   project; reviewing other PRs is a great way to develop experience,
   and even just manually testing a proposed new feature and posting
   feedback is super helpful.
-* [#documentation](https://chat.zulip.org/#narrow/stream/19-documentation)
+- [#documentation](https://chat.zulip.org/#narrow/stream/19-documentation)
   is where we discuss improving Zulip's user, sysadmin, and developer
   documentation.
-* [#translation](https://chat.zulip.org/#narrow/stream/58-translation) is
+- [#translation](https://chat.zulip.org/#narrow/stream/58-translation) is
   for discussing Zulip's translations.
-* [#learning](https://chat.zulip.org/#narrow/stream/92-learning) is for
+- [#learning](https://chat.zulip.org/#narrow/stream/92-learning) is for
   posting great learning resources one comes across.
 
 There are also official private streams, including large ones for
 established community contributors (and for GSoC mentors), and small
 streams where Kandra Labs staff can discuss customer support,
-production server operations, and security issues.  Because our
+production server operations, and security issues. Because our
 community values are to work in the open, these private streams are
 relatively low traffic.
 
 ## Searching for past conversations
 
 When [searching][] for previous discussions of a given topic, we
-recommend using the `streams:public keyword` set of operators.  This
+recommend using the `streams:public keyword` set of operators. This
 will search the full history of public streams in the organization for
 `keyword` (including messages sent before you joined and on public
 streams you're not subscribed to).

docs/contributing/code-reviewing.md

@@ -1,8 +1,8 @@
 # Reviewing Zulip code
 
-Code review is a key part of how Zulip does development!  If you've
+Code review is a key part of how Zulip does development! If you've
 been contributing to Zulip's code, we'd love for you to do reviews.
-This is a guide to how.  (With some thoughts for writing code too.)
+This is a guide to how. (With some thoughts for writing code too.)
 
 ## Protocol for authors
 
@@ -10,8 +10,9 @@ When you send a PR, try to think of a good person to review it --
 outside of the handful of people who do a ton of reviews -- and
 `@`-mention them with something like "`@person`, would you review
 this?". Good choices include
-* someone based in your timezone or a nearby timezone
-* people working on similar things, or in a loosely related area
+
+- someone based in your timezone or a nearby timezone
+- people working on similar things, or in a loosely related area
 
 Alternatively, posting a message in
 [#code-review](https://chat.zulip.org/#narrow/stream/91-code-review) on [the Zulip
@@ -26,19 +27,19 @@ to dive right into reviewing the PR's core functionality.
 ### Responding to a review feedback
 
 Once you've received a review and resolved any feedback, it's critical
-to update the GitHub thread to reflect that.  Best practices are to:
+to update the GitHub thread to reflect that. Best practices are to:
 
-* Make sure that CI passes and the PR is rebased onto recent master.
-* Post comments on each feedback thread explaining at least how you
+- Make sure that CI passes and the PR is rebased onto recent `main`.
+- Post comments on each feedback thread explaining at least how you
   resolved the feedback, as well as any other useful information
   (problems encountered, reasoning for why you picked one of several
   options, a test you added to make sure the bug won't recur, etc.).
-* Mark any resolved threads as "resolved" in the GitHub UI, if
+- Mark any resolved threads as "resolved" in the GitHub UI, if
   appropriate.
-* Post a summary comment in the main feed for the PR, explaining that
+- Post a summary comment in the main feed for the PR, explaining that
   this is ready for another review, and summarizing any changes from
   the previous version, details on how you tested the changes, new
-  screenshots/etc.  More detail is better than less, as long as you
+  screenshots/etc. More detail is better than less, as long as you
   take the time to write clearly.
 
 If you resolve the feedback, but the PR has merge conflicts, CI
@@ -48,7 +49,7 @@ will assume it isn't ready for review and move on to other work.
 
 If you need help or think an open discussion topic requires more
 feedback or a more complex discussion, move the discussion to a topic
-in the Zulip development community server.  Be sure to provide links
+in the Zulip development community server. Be sure to provide links
 from the GitHub PR to the conversation (and vice versa) so that it's
 convenient to read both conversations together.
 
@@ -60,10 +61,10 @@ Anyone can do a code review -- you don't have to have a ton of
 experience, and you don't have to have the power to ultimately merge
 the PR. If you
 
-* read the code, see if you understand what the change is
+- read the code, see if you understand what the change is
   doing and why, and ask questions if you don't; or
 
-* fetch the code (for Zulip server code,
+- fetch the code (for Zulip server code,
   [tools/fetch-rebase-pull-request][git tool] is super handy), play around
   with it in your dev environment, and say what you think about how
   the feature works
@@ -74,7 +75,7 @@ those are really helpful contributions.
 
 Doing code reviews is an important part of making the project grow.
 It's also an important skill to develop for participating in
-open-source projects and working in the industry in general.  If
+open-source projects and working in the industry in general. If
 you're contributing to Zulip and have been working in our code for a
 little while, we would love for some of your time contributing to come
 in the form of doing code reviews!
@@ -86,7 +87,7 @@ the first couple of weeks as you're getting going) doing code reviews.
 ### Fast replies are key
 
 For the author of a PR, getting feedback quickly is really important
-for making progress quickly and staying productive.  That means that
+for making progress quickly and staying productive. That means that
 if you get @-mentioned on a PR with a request for you to review it,
 it helps the author a lot if you reply promptly.
 
@@ -99,14 +100,14 @@ review the PR.
 
 People in the Zulip project live and work in many timezones, and code
 reviewers also need focused chunks of time to write code and do other
-things, so an immediate reply isn't always possible.  But a good
+things, so an immediate reply isn't always possible. But a good
 benchmark is to try to always reply **within one workday**, at least
-with a short initial reply, if you're working regularly on Zulip.  And
+with a short initial reply, if you're working regularly on Zulip. And
 sooner is better.
 
 ## Things to look for
 
-* *The CI build.* The tests need to pass. One can investigate
+- _The CI build._ The tests need to pass. One can investigate
   any failures and figure out what to fix by clicking on a red X next
   to the commit hash or the Detail links on a pull request. (Example:
   in [#17584](https://github.com/zulip/zulip/pull/17584),
@@ -120,76 +121,76 @@ sooner is better.
   See our docs on [continuous integration](../testing/continuous-integration.md)
   to learn more.
 
-* *Technical design.* There are a lot of considerations here:
+- _Technical design._ There are a lot of considerations here:
   security, migration paths/backwards compatibility, cost of new
   dependencies, interactions with features, speed of performance, API
-  changes.  Security is especially important and worth thinking about
+  changes. Security is especially important and worth thinking about
   carefully with any changes to security-sensitive code like views.
 
-* *User interface and visual design.* If frontend changes are
+- _User interface and visual design._ If frontend changes are
   involved, the reviewer will check out the code, play with the new
   UI, and verify it for both quality and consistency with the rest of
-  the Zulip UI.  We highly encourage posting screenshots to save
+  the Zulip UI. We highly encourage posting screenshots to save
   reviewers time in getting a feel for what the feature looks like --
   you'll get a quicker response that way.
 
-* *Error handling.* The code should always check for invalid user
-  input.  User-facing error messages should be clear and when possible
+- _Error handling._ The code should always check for invalid user
+  input. User-facing error messages should be clear and when possible
   be actionable (it should be obvious to the user what they need to do
   in order to correct the problem).
 
-* *Testing.* The tests should validate that the feature works
+- _Testing._ The tests should validate that the feature works
   correctly, and specifically test for common error conditions, bad
   user input, and potential bugs that are likely for the type of
-  change being made.  Tests that exclude whole classes of potential
+  change being made. Tests that exclude whole classes of potential
   bugs are preferred when possible (e.g., the common test suite
   `test_markdown.py` between the Zulip server's [frontend and backend
   Markdown processors](../subsystems/markdown.md), or the `GetEventsTest` test for
   buggy race condition handling).
 
-* *Translation.* Make sure that the strings are marked for
+- _Translation._ Make sure that the strings are marked for
   [translation].
 
-* *Clear function, argument, variable, and test names.* Every new
+- _Clear function, argument, variable, and test names._ Every new
   piece of Zulip code will be read many times by other developers, and
   future developers will grep for relevant terms when researching a
   problem, so it's important that variable names communicate clearly
   the purpose of each piece of the codebase.
 
-* *Duplicated code.* Code duplication is a huge source of bugs in
+- _Duplicated code._ Code duplication is a huge source of bugs in
   large projects and makes the codebase difficult to understand, so we
-  avoid significant code duplication wherever possible.  Sometimes
+  avoid significant code duplication wherever possible. Sometimes
   avoiding code duplication involves some refactoring of existing
   code; if so, that should usually be done as its own series of
   commits (not squashed into other changes or left as a thing to do
   later). That series of commits can be in the same pull request as
   the feature that they support, and we recommend ordering the history
-  of commits so that the refactoring comes *before* the feature. That
+  of commits so that the refactoring comes _before_ the feature. That
   way, it's easy to merge the refactoring (and minimize risk of merge
   conflicts) if there are still user experience issues under
   discussion for the feature itself.
 
-* *Completeness.* For refactorings, verify that the changes are
-  complete.  Usually one can check that efficiently using `git grep`,
+- _Completeness._ For refactorings, verify that the changes are
+  complete. Usually one can check that efficiently using `git grep`,
   and it's worth it, as we very frequently find issues by doing so.
 
-* *Documentation updates.*  If this changes how something works, does it
-  update the documentation in a corresponding way?  If it's a new
+- _Documentation updates._ If this changes how something works, does it
+  update the documentation in a corresponding way? If it's a new
   feature, is it documented, and documented in the right place?
 
-* *Good comments.* It's often worth thinking about whether explanation
+- _Good comments._ It's often worth thinking about whether explanation
   in a commit message or pull request discussion should be included in
   a comment, `/docs`, or other documentation. But it's better yet if
   verbose explanation isn't needed. We prefer writing code that is
   readable without explanation over a heavily commented codebase using
   lots of clever tricks.
 
-* *Coding style.* See the Zulip [code-style] documentation for
-  details.  Our goal is to have as much of this as possible verified
+- _Coding style._ See the Zulip [code-style] documentation for
+  details. Our goal is to have as much of this as possible verified
   via the linters and tests, but there's always going to be unusual
   forms of Python/JavaScript style that our tools don't check for.
 
-* *Clear commit messages.* See the [Zulip version
+- _Clear commit messages._ See the [Zulip version
   control][commit-messages] documentation for details on what we look
   for.
 
@@ -197,16 +198,16 @@ sooner is better.
 
 Some points specific to the Zulip server codebase:
 
-* *Testing -- Backend.* We are trying to maintain ~100% test coverage
+- _Testing -- Backend._ We are trying to maintain ~100% test coverage
   on the backend, so backend changes should have negative tests for
   the various error conditions.
 
-* *Testing -- Frontend.* If the feature involves frontend changes,
-  there should be frontend tests.  See the [test
+- _Testing -- Frontend._ If the feature involves frontend changes,
+  there should be frontend tests. See the [test
   writing][test-writing] documentation for more details.
 
-* *mypy annotations.* New functions should be annotated using [mypy]
-  and existing annotations should be updated.  Use of `Any`, `ignore`,
+- _mypy annotations._ New functions should be annotated using [mypy]
+  and existing annotations should be updated. Use of `Any`, `ignore`,
   and unparameterized containers should be limited to cases where a
   more precise type cannot be specified.
 
@@ -215,7 +216,7 @@ Some points specific to the Zulip server codebase:
 To make it easier to review pull requests, if you're working in the
 Zulip server codebase, use our [git tool]
 `tools/fetch-rebase-pull-request` to check out a pull request locally
-and rebase it against master.
+and rebase it onto `main`.
 
 If a pull request just needs a little fixing to make it mergeable,
 feel free to do that in a new commit, then push your branch to GitHub
@@ -226,14 +227,14 @@ the maintainer time and get the PR merged quicker.
 
 We also strongly recommend reviewers to go through the following resources.
 
-* [The Gentle Art of Patch Review](https://sage.thesharps.us/2014/09/01/the-gentle-art-of-patch-review/)
+- [The Gentle Art of Patch Review](https://sage.thesharps.us/2014/09/01/the-gentle-art-of-patch-review/)
   article by Sarah Sharp
-* [Zulip & Good Code Review](https://www.harihareswara.net/sumana/2016/05/17/0)
+- [Zulip & Good Code Review](https://www.harihareswara.net/sumana/2016/05/17/0)
   article by Sumana Harihareswara
-* [Code Review - A consolidation of advice and stuff from the
-   sinternet](https://gist.github.com/porterjamesj/002fb27dd70df003646df46f15e898de)
+- [Code Review - A consolidation of advice and stuff from the
+  internet](https://gist.github.com/porterjamesj/002fb27dd70df003646df46f15e898de)
   article by James J. Porter
-* [Zulip code of conduct](../code-of-conduct.md)
+- [Zulip code of conduct](../code-of-conduct.md)
 
 [code-style]: ../contributing/code-style.md
 [commit-messages]: ../contributing/version-control.html#commit-messages

docs/contributing/code-style.md

@@ -2,7 +2,7 @@
 
 One can summarize Zulip's coding philosophy as a relentless focus on
 making the codebase easy to understand and difficult to make dangerous
-mistakes in.  The majority of work in any large software development
+mistakes in. The majority of work in any large software development
 project is understanding the existing code so one can debug or modify
 it, and investments in code readability usually end up paying for
 themselves when someone inevitably needs to debug or improve the code.
@@ -15,10 +15,10 @@ comments/docstrings, and commit messages (roughly in order of priority
 better than writing a comment explaining how the bad interface works).
 
 This page documents code style policies that every Zulip developer
-should understand.  We aim for this document to be short and focused
+should understand. We aim for this document to be short and focused
 only on details that cannot be easily enforced another way (e.g.
 through linters, automated tests, subsystem design that makes classes
-of mistakes unlikely, etc.).  This approach minimizes the cognitive
+of mistakes unlikely, etc.). This approach minimizes the cognitive
 load of ensuring a consistent coding style for both contributors and
 maintainers.
 
@@ -34,25 +34,29 @@ When in doubt, ask in [chat.zulip.org](https://chat.zulip.org).
 
 You can run them all at once with
 
-    ./tools/lint
+```bash
+./tools/lint
+```
 
 You can set this up as a local Git commit hook with
 
-    tools/setup-git-repo
+```bash
+tools/setup-git-repo
+```
 
 The Vagrant setup process runs this for you.
 
 `lint` runs many lint checks in parallel, including
 
--   JavaScript ([ESLint](https://eslint.org/),
-    [Prettier](https://prettier.io/))
--   Python ([mypy](http://mypy-lang.org/),
-    [Pyflakes](https://pypi.python.org/pypi/pyflakes),
-    [Black](https://github.com/psf/black),
-    [isort](https://pycqa.github.io/isort/))
--   templates
--   Puppet configuration
--   custom checks (e.g. trailing whitespace and spaces-not-tabs)
+- JavaScript ([ESLint](https://eslint.org/),
+  [Prettier](https://prettier.io/))
+- Python ([mypy](http://mypy-lang.org/),
+  [Pyflakes](https://pypi.python.org/pypi/pyflakes),
+  [Black](https://github.com/psf/black),
+  [isort](https://pycqa.github.io/isort/))
+- templates
+- Puppet configuration
+- custom checks (e.g. trailing whitespace and spaces-not-tabs)
 
 ## Secrets
 
@@ -66,28 +70,34 @@ to read secrets from `/etc/zulip/secrets.conf`.
 
 Look out for Django code like this:
 
-    bars = Bar.objects.filter(...)
-    for bar in bars:
-        foo = bar.foo
-        # Make use of foo
+```python
+bars = Bar.objects.filter(...)
+for bar in bars:
+    foo = bar.foo
+    # Make use of foo
+```
 
 ...because it equates to:
 
-    bars = Bar.objects.filter(...)
-    for bar in bars:
-        foo = Foo.objects.get(id=bar.foo.id)
-        # Make use of foo
+```python
+bars = Bar.objects.filter(...)
+for bar in bars:
+    foo = Foo.objects.get(id=bar.foo.id)
+    # Make use of foo
+```
 
-...which makes a database query for every Bar.  While this may be fast
-locally in development, it may be quite slow in production!  Instead,
+...which makes a database query for every Bar. While this may be fast
+locally in development, it may be quite slow in production! Instead,
 tell Django's [QuerySet
 API](https://docs.djangoproject.com/en/dev/ref/models/querysets/) to
 _prefetch_ the data in the initial query:
 
-    bars = Bar.objects.filter(...).select_related()
-    for bar in bars:
-        foo = bar.foo  # This doesn't take another query, now!
-        # Make use of foo
+```python
+bars = Bar.objects.filter(...).select_related()
+for bar in bars:
+    foo = bar.foo  # This doesn't take another query, now!
+    # Make use of foo
+```
 
 If you can't rewrite it as a single query, that's a sign that something
 is wrong with the database schema. So don't defer this optimization when
@@ -118,7 +128,7 @@ different database queries:
 
 For example, the following will, surprisingly, fail:
 
-```
+```python
 # Bad example -- will raise!
 obj: UserProfile = get_user_profile_by_id(17)
 some_objs = UserProfile.objects.get(id=17)
@@ -127,15 +137,15 @@ assert obj in set([some_objs])
 
 You should work with the IDs instead:
 
-```
+```python
 obj: UserProfile = get_user_profile_by_id(17)
 some_objs = UserProfile.objects.get(id=17)
 assert obj.id in set([o.id for i in some_objs])
 ```
 
-### user\_profile.save()
+### user_profile.save()
 
-You should always pass the update\_fields keyword argument to .save()
+You should always pass the update_fields keyword argument to .save()
 when modifying an existing Django model object. By default, .save() will
 overwrite every value in the column, which results in lots of race
 conditions where unrelated changes made by one thread can be
@@ -145,7 +155,7 @@ object before the first thread wrote out its change.
 ### Using raw saves to update important model objects
 
 In most cases, we already have a function in zerver/lib/actions.py with
-a name like do\_activate\_user that will correctly handle lookups,
+a name like do_activate_user that will correctly handle lookups,
 caching, and notifying running browsers via the event system about your
 change. So please check whether such a function exists before writing
 new code to modify a model object, since your new code has a good chance
@@ -158,18 +168,19 @@ cause time-related bugs that are hard to catch with a test suite, or bugs
 that only show up during daylight savings time.
 
 Good ways to make timezone-aware datetimes are below. We import timezone
-libraries as `from datetime import datetime, timezone` and `from
-django.utils.timezone import now as timezone_now`.
+libraries as `from datetime import datetime, timezone` and
+`from django.utils.timezone import now as timezone_now`.
 
 Use:
-* `timezone_now()` to get a datetime when Django is available, such as
+
+- `timezone_now()` to get a datetime when Django is available, such as
   in `zerver/`.
-* `datetime.now(tz=timezone.utc)` when Django is not available, such as
+- `datetime.now(tz=timezone.utc)` when Django is not available, such as
   for bots and scripts.
-* `datetime.fromtimestamp(timestamp, tz=timezone.utc)` if creating a
+- `datetime.fromtimestamp(timestamp, tz=timezone.utc)` if creating a
   datetime from a timestamp. This is also available as
   `zerver.lib.timestamp.timestamp_to_datetime`.
-* `datetime.strptime(date_string, format).replace(tzinfo=timezone.utc)` if
+- `datetime.strptime(date_string, format).replace(tzinfo=timezone.utc)` if
   creating a datetime from a formatted string that is in UTC.
 
 Idioms that result in timezone-naive datetimes, and should be avoided, are
@@ -179,10 +190,11 @@ parameter, `datetime.utcnow()` and `datetime.utcfromtimestamp()`, and
 the end.
 
 Additional notes:
-* Especially in scripts and puppet configuration where Django is not
+
+- Especially in scripts and puppet configuration where Django is not
   available, using `time.time()` to get timestamps can be cleaner than
   dealing with datetimes.
-* All datetimes on the backend should be in UTC, unless there is a good
+- All datetimes on the backend should be in UTC, unless there is a good
   reason to do otherwise.
 
 ### `x.attr('zid')` vs. `rows.id(x)`
@@ -231,10 +243,8 @@ generally use modern
 [ECMAScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Language_Resources)
 primitives such as [`for … of`
 loops](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of),
-[`Array.prototype.{entries, every, filter, find, indexOf, map,
-some}`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array),
-[`Object.{assign, entries, keys,
-values}`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object),
+[`Array.prototype.{entries, every, filter, find, indexOf, map, some}`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array),
+[`Object.{assign, entries, keys, values}`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object),
 [spread
 syntax](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax),
 and so on. Our Babel configuration automatically transpiles and
@@ -255,9 +265,9 @@ code a lot uglier, in which case it's fine to go up to 120 or so.
 ### JavaScript and TypeScript
 
 Our JavaScript and TypeScript code is formatted with
-[Prettier](https://prettier.io/).  You can ask Prettier to reformat
-all code via our [linter tool](../testing/linters.md) with `tools/lint
---only=prettier --fix`.  You can also [integrate it with your
+[Prettier](https://prettier.io/). You can ask Prettier to reformat
+all code via our [linter tool](../testing/linters.md) with
+`tools/lint --only=prettier --fix`. You can also [integrate it with your
 editor](https://prettier.io/docs/en/editors.html).
 
 Combine adjacent on-ready functions, if they are logically related.
@@ -266,33 +276,39 @@ The best way to build complicated DOM elements is a Mustache template
 like `static/templates/message_reactions.hbs`. For simpler things
 you can use jQuery DOM building APIs like so:
 
-    var new_tr = $('<tr />').attr('id', object.id);
+```js
+var new_tr = $('<tr />').attr('id', object.id);
+```
 
 Passing a HTML string to jQuery is fine for simple hardcoded things
 that don't need internationalization:
 
-    foo.append('<p id="selected">/</p>');
+```js
+foo.append('<p id="selected">/</p>');
+```
 
 but avoid programmatically building complicated strings.
 
 We used to favor attaching behaviors in templates like so:
 
-    <p onclick="select_zerver({{id}})">
+```js
+<p onclick="select_zerver({{id}})">
+```
 
 but there are some reasons to prefer attaching events using jQuery code:
 
--   Potential huge performance gains by using delegated events where
-    possible
--   When calling a function from an `onclick` attribute, `this` is not
-    bound to the element like you might think
--   jQuery does event normalization
+- Potential huge performance gains by using delegated events where
+  possible
+- When calling a function from an `onclick` attribute, `this` is not
+  bound to the element like you might think
+- jQuery does event normalization
 
 Either way, avoid complicated JavaScript code inside HTML attributes;
 call a helper function instead.
 
 ### HTML / CSS
 
-Our CSS is formatted with [Prettier](https://prettier.io/).  You can
+Our CSS is formatted with [Prettier](https://prettier.io/). You can
 ask Prettier to reformat all code via our [linter
 tool](../testing/linters.md) with `tools/lint --only=prettier --fix`.
 You can also [integrate it with your
@@ -308,37 +324,40 @@ type changes in the future.
 
 ### Python
 
--   Our Python code is formatted with
-    [Black](https://github.com/psf/black) and
-    [isort](https://pycqa.github.io/isort/).  The [linter
-    tool](../testing/linters.md) enforces this by running Black and
-    isort in check mode, or in write mode with `tools/lint
-    --only=black,isort --fix`.  You may find it helpful to [integrate
-    Black](https://black.readthedocs.io/en/stable/editor_integration.html)
-    and
-    [isort](https://pycqa.github.io/isort/#installing-isorts-for-your-preferred-text-editor)
-    with your editor.
--   Don't put a shebang line on a Python file unless it's meaningful to
-    run it as a script. (Some libraries can also be run as scripts, e.g.
-    to run a test suite.)
--   Scripts should be executed directly (`./script.py`), so that the
-    interpreter is implicitly found from the shebang line, rather than
-    explicitly overridden (`python script.py`).
--   Put all imports together at the top of the file, absent a compelling
-    reason to do otherwise.
--   Unpacking sequences doesn't require list brackets:
+- Our Python code is formatted with
+  [Black](https://github.com/psf/black) and
+  [isort](https://pycqa.github.io/isort/). The [linter
+  tool](../testing/linters.md) enforces this by running Black and
+  isort in check mode, or in write mode with
+  `tools/lint --only=black,isort --fix`. You may find it helpful to
+  [integrate
+  Black](https://black.readthedocs.io/en/stable/editor_integration.html)
+  and
+  [isort](https://pycqa.github.io/isort/#installing-isorts-for-your-preferred-text-editor)
+  with your editor.
+- Don't put a shebang line on a Python file unless it's meaningful to
+  run it as a script. (Some libraries can also be run as scripts, e.g.
+  to run a test suite.)
+- Scripts should be executed directly (`./script.py`), so that the
+  interpreter is implicitly found from the shebang line, rather than
+  explicitly overridden (`python script.py`).
+- Put all imports together at the top of the file, absent a compelling
+  reason to do otherwise.
+- Unpacking sequences doesn't require list brackets:
 
-        [x, y] = xs    # unnecessary
-        x, y = xs      # better
+  ```python
+  [x, y] = xs    # unnecessary
+  x, y = xs      # better
+  ```
 
--   For string formatting, use `x % (y,)` rather than `x % y`, to avoid
-    ambiguity if `y` happens to be a tuple.
+- For string formatting, use `x % (y,)` rather than `x % y`, to avoid
+  ambiguity if `y` happens to be a tuple.
 
 ### Tests
 
 Clear, readable code is important for [tests](../testing/testing.md);
 familiarize yourself with our testing frameworks so that you can write
-clean, readable tests.  Comments about anything subtle about what is
+clean, readable tests. Comments about anything subtle about what is
 being verified are appreciated.
 
 ### Third party code

docs/contributing/gsoc-ideas.md

@@ -10,7 +10,7 @@ integrations, all open source.
 Zulip has gained a considerable amount of traction since it was
 [released as open source software][oss-release] in late 2015, with
 code contributions from [over 700 people](https://zulip.com/team)
-from all around the world.  Thousands of people use Zulip every single
+from all around the world. Thousands of people use Zulip every single
 day, and your work on Zulip will have impact on the daily experiences
 of a large and rapidly growing number of people.
 
@@ -19,7 +19,7 @@ of a large and rapidly growing number of people.
 As an organization, we value high-quality, responsive mentorship and
 making sure our product quality is extremely high -- you can expect to
 experience disciplined code reviews by highly experienced
-engineers.  Since Zulip is a team chat product, your GSoC experience
+engineers. Since Zulip is a team chat product, your GSoC experience
 with the Zulip project will be highly interactive.
 
 As part of that commitment, Zulip has over 160,000 words of
@@ -31,17 +31,17 @@ the way that it does.
 ### Our history with Google Open Source Programs
 
 Zulip has been a GSoC mentoring organization since 2016, and we aim
-for 15-20 GSoC students each summer.  We have some of the highest
+for 15-20 GSoC students each summer. We have some of the highest
 standards of any GSoC organization; successful applications generally
 have dozens of commits integrated into Zulip or other open source
-projects by the time we review their application.  See [our
+projects by the time we review their application. See [our
 contributing guide](../overview/contributing.md) for details on
 getting involved with GSoC.
 
 Zulip participated in GSoC 2016 and mentored three successful students
 officially (plus 4 more who did their proposed projects unofficially).
 We had 14 (+3) students in 2017, 10 (+3) students in 2018, 17 (+1) in
-2019, and 18 in 2020.  We've also mentored five Outreachy interns and
+2019, and 18 in 2020. We've also mentored five Outreachy interns and
 hundreds of Google Code-In participants (several of who are major
 contributors to the project today).
 
@@ -55,7 +55,7 @@ the summer).
 
 [Our guide for having a great summer with Zulip](../contributing/summer-with-zulip.md)
 is focused on what one should know once doing a summer project with
-Zulip.  But it has a lot of useful advice on how we expect students to
+Zulip. But it has a lot of useful advice on how we expect students to
 interact, above and beyond what is discussed in Google's materials.
 
 [What makes a great Zulip contributor](../overview/contributing.html#what-makes-a-great-zulip-contributor)
@@ -69,7 +69,7 @@ We also recommend reviewing
 
 Finally, keep your eye on
 [the GSoC timeline](https://developers.google.com/open-source/gsoc/timeline). The
-student application deadline is April 13, 2021.  However, as is
+student application deadline is April 13, 2021. However, as is
 discussed in detail later in this document, we recommend against
 working on a proposal until 2 weeks before the deadline.
 
@@ -100,21 +100,21 @@ make contributions, and make a good proposal.
 
 Your application should include the following:
 
-* Details on any experience you have related to the technologies that
+- Details on any experience you have related to the technologies that
   Zulip has, or related to our product approach.
-* Links to materials to help us evaluate your level of experience and
+- Links to materials to help us evaluate your level of experience and
   how you work, such as personal projects of yours, including any
   existing open source or open culture contributions you've made and
   any bug reports you've submitted to open source projects.
-* Some notes on what you are hoping to get out of your project.
-* A description of the project you'd like to do, and why you're
+- Some notes on what you are hoping to get out of your project.
+- A description of the project you'd like to do, and why you're
   excited about it.
-* Some notes on why you're excited about working on Zulip.
-* A link to the initial contribution(s) you did.
+- Some notes on why you're excited about working on Zulip.
+- A link to the initial contribution(s) you did.
 
 We expect applicants to either have experience with the technologies
 relevant to their project or have strong general programming
-experience.  We also expect applicants to be excited about learning
+experience. We also expect applicants to be excited about learning
 how to do disciplined, professional software engineering, where they
 can demonstrate through reasoning and automated tests that their code
 is correct.
@@ -138,19 +138,19 @@ Also, you're going to find that people give you links to pages that
 answer your questions. Here's how that often works:
 
 1. you [try to solve your problem until you get stuck, including
-looking through our code and our documentation, then start formulating
-your request for
-help](https://blogs.akamai.com/2013/10/you-must-try-and-then-you-must-ask.html)
+   looking through our code and our documentation, then start formulating
+   your request for
+   help](https://blogs.akamai.com/2013/10/you-must-try-and-then-you-must-ask.html)
 1. you ask your question
 1. someone directs you to a document
 1. you go read that document, and try to use it to answer your question
 1. you find you are confused about a new thing
 1. you ask another question
 1. now that you have demonstrated that you have the ability to read,
-think, and learn new things, someone has a longer talk with you to
-answer your new specific question
+   think, and learn new things, someone has a longer talk with you to
+   answer your new specific question
 1. you and the other person collaborate to improve the document that you
-read in step 3 :-)
+   read in step 3 :-)
 
 This helps us make a balance between person-to-person discussion and
 documentation that everyone can read, so we save time answering common
@@ -166,19 +166,19 @@ post.](https://www.harihareswara.net/sumana/2016/10/12/0)
 ## Mentors
 
 Zulip has dozens of longtime contributors who sign up to mentoring
-projects.  We usually decide who will mentor which projects based in
+projects. We usually decide who will mentor which projects based in
 part on who is a good fit for the needs of each student as well as
 technical expertise as well as who has available time during the
-summer.  You can reach us via
+summer. You can reach us via
 [#GSoC](https://chat.zulip.org/#narrow/stream/14-GSoC) on [the Zulip
 development community server](../contributing/chat-zulip-org.md),
 (compose a new stream message with your name as the topic).
 
-Zulip operates under group mentorship.  That means you should
+Zulip operates under group mentorship. That means you should
 generally post in public streams on chat.zulip.org, not send private
-messages, for assistance.  Our preferred approach is to just post in
+messages, for assistance. Our preferred approach is to just post in
 an appropriate public stream on chat.zulip.org and someone will help
-you.  We list the Zulip contributors who are experts for various
+you. We list the Zulip contributors who are experts for various
 projects by name below; they will likely be able to provide you with
 the best feedback on your proposal (feel free to @-mention them in
 your Zulip post). In practice, this allows project leadership to
@@ -188,11 +188,11 @@ However, the first and most important thing to do for building a
 strong application is to show your skills by contributing to a large
 open source project like Zulip, to show that you can work effectively
 in a large codebase (it doesn't matter what part of Zulip, and we're
-happy to consider work in other open source projects).  The quality of
+happy to consider work in other open source projects). The quality of
 your best work is more important to us than the quantity; so be sure
 to test your work before submitting it for review and follow our
 coding guidelines (and don't worry if you make mistakes in your first
-few contributions!  Everyone makes mistakes getting started.  Just
+few contributions! Everyone makes mistakes getting started. Just
 make sure you don't make the same mistakes next time).
 
 Once you have several PRs merged (or at least one significant PR
@@ -206,8 +206,8 @@ online.
 
 These are the seeds of ideas; you will need to do research on the
 Zulip codebase, read issues on GitHub, and talk with developers to put
-together a complete project proposal.  It's also fine for you to come
-up with your own project ideas.  As you'll see below, you can put
+together a complete project proposal. It's also fine for you to come
+up with your own project ideas. As you'll see below, you can put
 together a great project around one of the
 [area labels](https://github.com/zulip/zulip/labels) on GitHub; each
 has a cluster of problems in one part of the Zulip project that we'd
@@ -217,13 +217,13 @@ We don't believe in labeling projects by difficulty (e.g. a project
 that involves writing a lot of documentation will be hard for some
 great programmers, and a UI design project might be hard for a great
 backend programmer, while a great writer might have trouble doing
-performance work).  To help you find a great project, we list the
+performance work). To help you find a great project, we list the
 skills needed, and try to emphasize where strong skills with
 particular tools are likely to be important for a given project.
 
 For all of our projects, an important skill to develop is a good
 command of Git; read [our Git guide](../git/overview.md) in full to
-learn how to use it well.  Of particular importance is mastering using
+learn how to use it well. Of particular importance is mastering using
 Git rebase so that you can construct commits that are clearly correct
 and explain why they are correct. We highly recommend investing in
 learning a [graphical Git client](../git/setup.md) and learning to
@@ -246,13 +246,13 @@ set of 8 issues may not be the right ones to invest in.
 
 For 2021, we are particularly interested in GSoC students who have
 strong skills at visual design, HTML/CSS, mobile development,
-performance optimization, or Electron.  So if you're a student with
+performance optimization, or Electron. So if you're a student with
 those skills and are looking for an organization to join, we'd love to
 talk to you!
 
 The Zulip project has a huge surface area, so even when we're focused
 on something, a huge amount of essential work goes into other parts of
-the project.  Every area of Zulip could benefit from the work of a
+the project. Every area of Zulip could benefit from the work of a
 student with strong programming skills; so don't feel discouraged if
 the areas mentioned above are not your main strength.
 
@@ -273,12 +273,12 @@ CSS](https://github.com/zulip/zulip/).
   Zulip has a [nice framework](../documentation/api.md) for writing
   API documentation built by past GSoC students based on the OpenAPI
   standard with built-in automated tests of the data both the Python
-  and curl examples.  However, the documentation isn't yet what we're
+  and curl examples. However, the documentation isn't yet what we're
   hoping for: there are a few dozen endpoints that are missing,
   several of which are quite important, the visual design isn't
   perfect (especially for e.g. `GET /events`), many template could be
-  deleted with a bit of framework effort, etc.  See the [API docs area
-  label][api-docs-area] for many specific projects in the area.  Our
+  deleted with a bit of framework effort, etc. See the [API docs area
+  label][api-docs-area] for many specific projects in the area. Our
   goal for the summer is for 1-2 students to resolve all open issues
   related to the REST API documentation.
 
@@ -288,46 +288,46 @@ CSS](https://github.com/zulip/zulip/).
   Zulip, including [default stream
   groups](https://github.com/zulip/zulip/issues/13670), [Mute
   User](https://github.com/zulip/zulip/issues/168), and [public
-  access](https://github.com/zulip/zulip/issues/13172).  Expert: Tim
-  Abbott.  Many of these issues have open PRs with substantial work
+  access](https://github.com/zulip/zulip/issues/13172). Expert: Tim
+  Abbott. Many of these issues have open PRs with substantial work
   towards the goal, but each of them is likely to have dozens of
   adjacent or follow-up tasks.
 
 - Fill in gaps, fix bugs, and improve the framework for Zulip's
-  library of native integrations.  We have about 100 integrations, but
-  there are a handful of important integrations that are missing.  The
+  library of native integrations. We have about 100 integrations, but
+  there are a handful of important integrations that are missing. The
   [the integrations label on
   GitHub](https://github.com/zulip/zulip/labels/area%3A%20integrations)
   lists some of the priorities here (many of which are great
   preparatory projects); once those are cleared, we'll likely have
-  many more.  **Skills required**: Strong Python experience, will to
-  do careful manual testing of third-party products.  Fluent English,
+  many more. **Skills required**: Strong Python experience, will to
+  do careful manual testing of third-party products. Fluent English,
   usability sense and/or technical writing skills are all pluses.
   Expert: Eeshan Garg.
 
 - Optimize performance and scalability, either for the web frontend or
-  the server.  Zulip is already one of the faster webapps out there,
+  the server. Zulip is already one of the faster webapps out there,
   but there are a bunch of ideas for how to make it substantially
-  faster.  This is likely a particularly challenging project to do
+  faster. This is likely a particularly challenging project to do
   well, since there are a lot of subtle interactions to understand.
   **Skill recommended**: Strong debugging, communication, and code
-  reading skills are most important here.  JavaScript experience; some
+  reading skills are most important here. JavaScript experience; some
   Python/Django experience, some skill with CSS, ideally experience
   using the Chrome Timeline profiling tools (but you can pick this up
-  as you go) can be useful depending on what profiling shows.  Our
+  as you go) can be useful depending on what profiling shows. Our
   [backend scalability design doc](../subsystems/performance.md) and
   the [production issue label][prod-label] (where
   performance/scalability issues tend to be filed) may be helpful
-  reading for the backend part of this.  Expert: Steve Howell.
+  reading for the backend part of this. Expert: Steve Howell.
 
 [prod-label]: https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22area%3A+production%22
 
 - Extract JavaScript logic modules from the Zulip webapp that we'd
-  like to be able to share with the Zulip webapp.  This work can have
+  like to be able to share with the Zulip webapp. This work can have
   big benefits it terms of avoiding code duplication for complex
-  logic.  We have prototyped for a few modules by migrating them to
+  logic. We have prototyped for a few modules by migrating them to
   `static/shared/`; this project will involve closely collaborating
-  with the mobile team to prioritize the modules to migrate.  **Skills
+  with the mobile team to prioritize the modules to migrate. **Skills
   recommended**: JavaScript experience, careful refactoring, API
   design, React.
 
@@ -338,12 +338,12 @@ CSS](https://github.com/zulip/zulip/).
   permissions (and implementing the enforcement logic), adding an
   OAuth system for presenting those controls to users, as well as
   making the /integrations page UI have buttons to create a bot,
-  rather than sending users to the administration page.  **Skills
+  rather than sending users to the administration page. **Skills
   recommended**: Strong Python/Django; JavaScript, CSS, and design
-  sense helpful.  Understanding of implementing OAuth providers,
+  sense helpful. Understanding of implementing OAuth providers,
   e.g. having built a prototype with
   [the Django OAuth toolkit](https://django-oauth-toolkit.readthedocs.io/en/latest/)
-  would be great to demonstrate as part of an application.  The
+  would be great to demonstrate as part of an application. The
   [Zulip integration writing guide](../documentation/integrations.md)
   and
   [integration documentation](https://zulip.com/integrations/)
@@ -351,69 +351,69 @@ CSS](https://github.com/zulip/zulip/).
   and
   [the integrations label on GitHub](https://github.com/zulip/zulip/labels/area%3A%20integrations)
   has a bunch of good starter issues to demonstrate your skills if
-  you're interested in this area.  Expert: Eeshan Garg.
+  you're interested in this area. Expert: Eeshan Garg.
 
 - Extend Zulip's meta-integration that converts the Slack incoming webhook
   API to post messages into Zulip. Zulip has several dozen native
   integrations (https://zulip.com/integrations/), but Slack has a
-  ton more.  We should build an interface to make all of Slack’s
+  ton more. We should build an interface to make all of Slack’s
   numerous third-party integrations work with Zulip as well, by
   basically building a Zulip incoming webhook interface that accepts
   the Slack API (if you just put in a Zulip server URL as your "Slack
-  server").  **Skills required**: Strong Python experience; experience
-  with the Slack API a plus.  Work should include documenting the
-  system and advertising it.  Expert: Tim Abbott.
+  server"). **Skills required**: Strong Python experience; experience
+  with the Slack API a plus. Work should include documenting the
+  system and advertising it. Expert: Tim Abbott.
 
 - Visual and user experience design work on the core Zulip web UI.
   We're particularly excited about students who are interested in
   making our CSS clean and readable as part of working on the UI.
   **Skills required**: Design, HTML and CSS skills; JavaScript and
-  illustration experience are helpful.  A great application would
+  illustration experience are helpful. A great application would
   include PRs making small, clean improvements to the Zulip UI
-  (whether logged-in or logged-out pages).  Expert: Aman Agrawal.
+  (whether logged-in or logged-out pages). Expert: Aman Agrawal.
 
 - Build support for outgoing webhooks and slash commands into Zulip to
-  improve its chat-ops capabilities.  There's an existing
+  improve its chat-ops capabilities. There's an existing
   [pull request](https://github.com/zulip/zulip/pull/1393) with a lot
   of work on the outgoing webhooks piece of this feature that would
   need to be cleaned up and finished, and then we need to build support for slash
   commands, some example integrations, and a full set of
-  documentation and tests.  Recommended reading includes Slack's
+  documentation and tests. Recommended reading includes Slack's
   documentation for these features, the Zulip message sending code
   path, and the linked pull request. **Skills required**: Strong
-  Python/Django skills.  Expert: Steve Howell.
+  Python/Django skills. Expert: Steve Howell.
 
 - Build a system for managing Zulip bots entirely on the web.
   Right now, there's a somewhat cumbersome process where you download
   the API bindings, create a bot with an API key, put it in
-  configuration files, etc.  We'd like to move to a model where a bot
+  configuration files, etc. We'd like to move to a model where a bot
   could easily progress from being a quick prototype to being a third-party extension to
-  being built into Zulip.  And then for built-in bots, one should be able to click a few
+  being built into Zulip. And then for built-in bots, one should be able to click a few
   buttons of configuration on the web to set them up and include them in
-  your organization.  We've developed a number of example bots
-  in the (`zulip_bots`](https://github.com/zulip/python-zulip-api/tree/master/zulip_bots)
+  your organization. We've developed a number of example bots
+  in the [`zulip_bots`](https://github.com/zulip/python-zulip-api/tree/main/zulip_bots)
   PyPI package.
   **Skills recommended**: Python and JavaScript/CSS, plus devops
   skills (Linux deployment, Docker, Puppet etc.) are all useful here.
   Experience writing tools using various popular APIs is helpful for
-  being able to make good choices.  Expert: Steve Howell.
+  being able to make good choices. Expert: Steve Howell.
 
 - Improve the UI and visual design of the existing Zulip settings and
-  administration pages while fixing bugs and adding new settings.  The
+  administration pages while fixing bugs and adding new settings. The
   pages have improved a great deal during recent GSoCs, but because
-  they have a ton of surface area, there's a lot to do.  You can get a
+  they have a ton of surface area, there's a lot to do. You can get a
   great sense of what needs to be done by playing with the
   settings/administration/streams overlays in a development
-  environment.  You can get experience working on the subsystem by
+  environment. You can get experience working on the subsystem by
   working on some of [our open settings/admin
   issues](https://github.com/zulip/zulip/labels/area%3A%20admin).
   **Skills recommended**: JavaScript, HTML, CSS, and an eye for visual
-  design.  Expert: Shubham Dhama.
+  design. Expert: Shubham Dhama.
 
 - Build out the administration pages for Zulip to add new permissions
   and other settings more features that will make Zulip better for
-  larger organizations.  We get constant requests for these kinds of
-  features from Zulip users.  The Zulip bug tracker has plentiful open
+  larger organizations. We get constant requests for these kinds of
+  features from Zulip users. The Zulip bug tracker has plentiful open
   issues( [settings
   (admin/org)](https://github.com/zulip/zulip/labels/area%3A%20settings%20%28admin%2Forg%29),
   [settings
@@ -422,32 +422,32 @@ CSS](https://github.com/zulip/zulip/).
   (user)](https://github.com/zulip/zulip/labels/area%3A%20settings%20%28user%29),
   [stream
   settings](https://github.com/zulip/zulip/labels/area%3A%20stream%20settings)
-  ) in the space of improving the Zulip administrative UI.  Many are
+  ) in the space of improving the Zulip administrative UI. Many are
   little bite-size fixes in those pages, which are great for getting a
   feel for things, but a solid project here would be implementing 5-10
   of the major missing features as full-stack development projects.
   The first part of this project will be refactoring the admin UI
   interfaces to require writing less semi-duplicate code for each
   feature. **Skills recommended**: A good mix of Python/Django and
-  HTML/CSS/JavaScript skill is ideal.  The system for adding new
+  HTML/CSS/JavaScript skill is ideal. The system for adding new
   features is [well documented](../tutorials/new-feature-tutorial.md).
   Expert: Shubham Dhama.
 
-- Write cool new features for Zulip.  Play around with the software,
+- Write cool new features for Zulip. Play around with the software,
   browse Zulip's issues for things that seem important, and suggest
-  something you’d like to build!  A great project can combine 3-5
-  significant features.  Experts: Depends on the features!
+  something you’d like to build! A great project can combine 3-5
+  significant features. Experts: Depends on the features!
 
-- Work on Zulip's development and testing infrastructure.  Zulip is a
+- Work on Zulip's development and testing infrastructure. Zulip is a
   project that takes great pride in building great tools for
   development, but there's always more to do to make the experience
-  delightful.  Significantly, a full 10% of Zulip's open issues are
+  delightful. Significantly, a full 10% of Zulip's open issues are
   ideas for how to improve the project, and are
   [in](https://github.com/zulip/zulip/labels/area%3A%20tooling)
   [these](https://github.com/zulip/zulip/labels/area%3A%20testing-coverage)
   [four](https://github.com/zulip/zulip/labels/area%3A%20testing-infrastructure)
   [labels](https://github.com/zulip/zulip/labels/area%3A%20provision)
-  for tooling improvements.  A good place to start is
+  for tooling improvements. A good place to start is
   [backend test coverage](https://github.com/zulip/zulip/issues/7089).
 
   This is a somewhat unusual project, in that it would likely consist
@@ -459,14 +459,14 @@ CSS](https://github.com/zulip/zulip/).
 
   A possible specific larger project in this space is working on
   adding [mypy](../testing/mypy.md) stubs
-  for Django in mypy to make our type checking more powerful.  Read
+  for Django in mypy to make our type checking more powerful. Read
   [our mypy blog post](https://blog.zulip.org/2016/10/13/static-types-in-python-oh-mypy/)
-  for details on how mypy works and is integrated into Zulip.  This
+  for details on how mypy works and is integrated into Zulip. This
   specific project is ideal for a strong contributor interested in
   type systems.
 
   **Skills required**: Python, some DevOps, and a passion for checking
-  your work carefully.  A strong applicant for this will have
+  your work carefully. A strong applicant for this will have
   completed several projects in these areas.
 
   Experts: Anders Kaseorg (provision, testing), Steve Howell (tooling, testing).
@@ -476,25 +476,25 @@ CSS](https://github.com/zulip/zulip/).
   [python](https://github.com/zulip/python-zulip-api),
   [JavaScript](https://github.com/zulip/zulip-js),
   [PHP](https://packagist.org/packages/mrferos/zulip-php), and
-  [Haskell](https://hackage.haskell.org/package/hzulip)).  The
+  [Haskell](https://hackage.haskell.org/package/hzulip)). The
   JavaScript bindings are a particularly high priority, since they are
   a project that hasn't gotten a lot of attention since being adopted
   from its original author, and we'd like to convert them to
-  Typescript.  **Skills required**: Experience with the target
-  language and API design.  Expert: Depends on language.
+  Typescript. **Skills required**: Experience with the target
+  language and API design. Expert: Depends on language.
 
 - Develop [**@zulipbot**](https://github.com/zulip/zulipbot), the GitHub
-workflow bot for the Zulip organization and its repositories. By utilizing the
-[GitHub API](https://developer.github.com/v3/),
-[**@zulipbot**](https://github.com/zulipbot) improves the experience of Zulip
-contributors by managing the issues and pull requests in the Zulip repositories,
-such as assigning issues to contributors and appropriately labeling issues with
-their current status to help contributors gain a better understanding of which
-issues are being worked on. Since the project is in its early stages of
-development, there are a variety of possible tasks that can be done, including
-adding new features, writing unit tests and creating a testing framework, and
-writing documentation. **Skills required**: Node.js, ECMAScript 6, and API
-experience. Experts: Cynthia Lin, Joshua Pan.
+  workflow bot for the Zulip organization and its repositories. By utilizing the
+  [GitHub API](https://developer.github.com/v3/),
+  [**@zulipbot**](https://github.com/zulipbot) improves the experience of Zulip
+  contributors by managing the issues and pull requests in the Zulip repositories,
+  such as assigning issues to contributors and appropriately labeling issues with
+  their current status to help contributors gain a better understanding of which
+  issues are being worked on. Since the project is in its early stages of
+  development, there are a variety of possible tasks that can be done, including
+  adding new features, writing unit tests and creating a testing framework, and
+  writing documentation. **Skills required**: Node.js, ECMAScript 6, and API
+  experience. Experts: Cynthia Lin, Joshua Pan.
 
 ### React Native mobile app
 
@@ -505,12 +505,12 @@ Experts: Greg Price, Chris Bobbe.
 The highest priority for the Zulip project overall is improving the
 Zulip React Native mobile app.
 
-- Work on issues and polish for the app.  You can see the open issues
-  [here](https://github.com/zulip/zulip-mobile/issues).  There are a
+- Work on issues and polish for the app. You can see the open issues
+  [here](https://github.com/zulip/zulip-mobile/issues). There are a
   few hundred open issues across the project, and likely many more
   problems that nobody has found yet; in the short term, it needs
-  polish, bug finding/squashing, and debugging.  So browse the open
-  issues, play with the app, and get involved!  Goals include parity
+  polish, bug finding/squashing, and debugging. So browse the open
+  issues, play with the app, and get involved! Goals include parity
   with the webapp (in terms of what you can do), parity with Slack (in
   terms of the visuals), world-class scrolling and narrowing
   performance, and a great codebase.
@@ -518,15 +518,15 @@ Zulip React Native mobile app.
 A good project proposal here will bundle together a few focus areas
 that you want to make really great (e.g. the message composing,
 editing, and reacting experience), that you can work on over the
-summer.  We'd love to have multiple students working on this area if
+summer. We'd love to have multiple students working on this area if
 we have enough strong applicants.
 
 **Skills required**: Strong programming experience, especially in
-  reading the documentation of unfamiliar projects and communicating
-  what you learned.  JavaScript and React experience are great pluses,
-  as are iOS or Android development/design experience is useful as
-  well.  You'll need to learn React Native as part of getting
-  involved.  There's tons of good online tutorials, courses, etc.
+reading the documentation of unfamiliar projects and communicating
+what you learned. JavaScript and React experience are great pluses,
+as are iOS or Android development/design experience is useful as
+well. You'll need to learn React Native as part of getting
+involved. There's tons of good online tutorials, courses, etc.
 
 ### Electron desktop app
 
@@ -535,14 +535,14 @@ Code:
 Experts: Anders Kaseorg, Akash Nimare, Abhighyan Khaund.
 
 - Contribute to our [Electron-based desktop client
-  application](https://github.com/zulip/zulip-desktop).  There's
+  application](https://github.com/zulip/zulip-desktop). There's
   plenty of feature/UI work to do, but focus areas for us include
   things to (1) improve the release process for the app, using
-  automated testing, TypeScript, etc. and (2) polish the UI.  Browse
+  automated testing, TypeScript, etc. and (2) polish the UI. Browse
   the open issues and get involved!
 
-**Skills required**: JavaScript experience, Electron experience.  You
-  can learn electron as part of your application!
+**Skills required**: JavaScript experience, Electron experience. You
+can learn electron as part of your application!
 
 Good preparation for desktop app projects is to (1) try out the app
 and see if you can find bugs or polish problems lacking open issues
@@ -556,10 +556,10 @@ Experts: Aman Agrawal, Neil Pilgrim.
 
 - Work on Zulip Terminal, the official terminal client for Zulip.
   zulip-terminal is already a basic usable client, but it needs a lot
-  of work to approach the webapp's quality level.  We would be happy
-  to accept multiple strong students to work on this project.  Our
+  of work to approach the webapp's quality level. We would be happy
+  to accept multiple strong students to work on this project. Our
   goal for this summer is to improve its quality enough that we can
-  upgrade it from an alpha to an advertised feature.  **Skills
+  upgrade it from an alpha to an advertised feature. **Skills
   required**: Python 3 development skills, good communication and
   project management skills, good at reading code and testing.
 
@@ -569,7 +569,7 @@ Code: [zulip-archive](https://github.com/zulip/zulip-archive)
 Experts: Rein Zustand, Steve Howell
 
 - Work on zulip-archive, which provides a Google-indexable read-only
-  archive of Zulip conversations.  The issue tracker for the project
+  archive of Zulip conversations. The issue tracker for the project
   has a great set of introductory/small projects; the overall goal is
   to make the project super convenient to use for our OSS communities.
   **Skills useful**: Python 3, reading feedback from users, CSS,
@@ -584,16 +584,16 @@ two before the application deadline. That way, the whole developer
 community -- not just the mentors and administrators -- have a chance
 to give you feedback and help you improve your proposal.
 
-Where should you publish your draft?  We prefer Dropbox Paper or
+Where should you publish your draft? We prefer Dropbox Paper or
 Google Docs, since those platforms allow people to look at the text
 without having to log in or download a particular app, and you can
-update the draft as you improve your idea.  In either case, you should
+update the draft as you improve your idea. In either case, you should
 post the draft for feedback in chat.zulip.org.
 
 Rough is fine! The ideal first draft to get feedback from the
 community on should include primarily (1) links to your contributions
 to Zulip (or other projects) and (2) a paragraph or two explaining
-what you plan to work on.  Your friends are likely better able to help
+what you plan to work on. Your friends are likely better able to help
 you improve the sections of your application explaining who you are,
 and this helps the community focus feedback on the areas you can most
 improve (e.g. either doing more contributions or adjusting the project

docs/contributing/summer-with-zulip.md

@@ -88,14 +88,14 @@ materials](https://developers.google.com/open-source/gsoc/resources/manual).
 
   - If you work in one a smaller Zulip project
     (e.g. `zulip-terminal`), follow the project on GitHub so you can
-    keep track of what's happening there.  For folks working in
+    keep track of what's happening there. For folks working in
     `zulip/zulip`, doing that will send you too many notifications.
     So instead, we recommend that you join Zulip's GitHub teams that
     relate to your projects and/or interests, so that you see new
-    issues and PRs coming in that are relevant to your work.  When we
+    issues and PRs coming in that are relevant to your work. When we
     label an issue or PR with one of our area labels, `zulipbot` will
     automatically mention the relevant teams for that area,
-    subscribing you to those issues/PR threads.  You can browse the
+    subscribing you to those issues/PR threads. You can browse the
     area teams here: https://github.com/orgs/zulip/teams (You need to
     be a member of the Zulip organization to see them;
     ask Tim for an invite if needed).
@@ -225,7 +225,6 @@ materials](https://developers.google.com/open-source/gsoc/resources/manual).
   your contributions to the open source world this summer will be something you
   can be proud of for the rest of your life.
 
-
 ## What makes a successful summer
 
 Success for the student means a few things, in order of importance:
@@ -247,7 +246,6 @@ Success for the student means a few things, in order of importance:
   student has implemented. That section of code should be more readable,
   better-tested, and have clearer documentation.
 
-
 ## Extra notes for mentors
 
 - You're personally accountable for your student having a successful summer. If
@@ -268,9 +266,9 @@ Success for the student means a few things, in order of importance:
   plan it, you can get several round trips in per day even with big timezone
   differences like USA + India.
 
--  What exactly you focus on in your mentorship will vary from week to week and
-   depend somewhat on what the student needs. It might be any combination of
-   these things:
+- What exactly you focus on in your mentorship will vary from week to week and
+  depend somewhat on what the student needs. It might be any combination of
+  these things:
 
   - Helping the student plan, chunk, and prioritize their work.
 

docs/contributing/version-control.md

@@ -11,68 +11,68 @@ helps a lot in preventing bugs.
 
 Commits must be coherent:
 
--   It should pass tests (so test updates needed by a change should be
-    in the same commit as the original change, not a separate "fix the
-    tests that were broken by the last commit" commit).
--   It should be safe to deploy individually, or explain in detail in
-    the commit message as to why it isn't (maybe with a [manual] tag).
-    So implementing a new API endpoint in one commit and then adding the
-    security checks in a future commit should be avoided -- the security
-    checks should be there from the beginning.
--   Error handling should generally be included along with the code that
-    might trigger the error.
--   TODO comments should be in the commit that introduces the issue or
-    the functionality with further work required.
+- It should pass tests (so test updates needed by a change should be
+  in the same commit as the original change, not a separate "fix the
+  tests that were broken by the last commit" commit).
+- It should be safe to deploy individually, or explain in detail in
+  the commit message as to why it isn't (maybe with a [manual] tag).
+  So implementing a new API endpoint in one commit and then adding the
+  security checks in a future commit should be avoided -- the security
+  checks should be there from the beginning.
+- Error handling should generally be included along with the code that
+  might trigger the error.
+- TODO comments should be in the commit that introduces the issue or
+  the functionality with further work required.
 
 Commits should generally be minimal:
 
--   Significant refactorings should be done in a separate commit from
-    functional changes.
--   Moving code from one file to another should be done in a separate
-    commits from functional changes or even refactoring within a file.
--   2 different refactorings should be done in different commits.
--   2 different features should be done in different commits.
--   If you find yourself writing a commit message that reads like a list
-    of somewhat dissimilar things that you did, you probably should have
-    just done multiple commits.
+- Significant refactorings should be done in a separate commit from
+  functional changes.
+- Moving code from one file to another should be done in a separate
+  commits from functional changes or even refactoring within a file.
+- 2 different refactorings should be done in different commits.
+- 2 different features should be done in different commits.
+- If you find yourself writing a commit message that reads like a list
+  of somewhat dissimilar things that you did, you probably should have
+  just done multiple commits.
 
 When not to be overly minimal:
 
--   For completely new features, you don't necessarily need to split out
-    new commits for each little subfeature of the new feature. E.g., if
-    you're writing a new tool from scratch, it's fine to have the
-    initial tool have plenty of options/features without doing separate
-    commits for each one. That said, reviewing a 2000-line giant blob of
-    new code isn't fun, so please be thoughtful about submitting things
-    in reviewable units.
--   Don't bother to split backend commits from frontend commits, even
-    though the backend can often be coherent on its own.
+- For completely new features, you don't necessarily need to split out
+  new commits for each little subfeature of the new feature. E.g., if
+  you're writing a new tool from scratch, it's fine to have the
+  initial tool have plenty of options/features without doing separate
+  commits for each one. That said, reviewing a 2000-line giant blob of
+  new code isn't fun, so please be thoughtful about submitting things
+  in reviewable units.
+- Don't bother to split backend commits from frontend commits, even
+  though the backend can often be coherent on its own.
 
 Other considerations:
 
--   Overly fine commits are easy to squash later, but not vice versa.
-    So err toward small commits, and the code reviewer can advise on
-    squashing.
--   If a commit you write doesn't pass tests, you should usually fix
-    that by amending the commit to fix the bug, not writing a new "fix
-    tests" commit on top of it.
+- Overly fine commits are easy to squash later, but not vice versa.
+  So err toward small commits, and the code reviewer can advise on
+  squashing.
+- If a commit you write doesn't pass tests, you should usually fix
+  that by amending the commit to fix the bug, not writing a new "fix
+  tests" commit on top of it.
 
 Zulip expects you to structure the commits in your pull requests to form
-a clean history before we will merge them.  It's best to write your
+a clean history before we will merge them. It's best to write your
 commits following these guidelines in the first place, but if you don't,
 you can always fix your history using `git rebase -i` (more on that
 [here](../git/fixing-commits.md)).
 
 Never mix multiple changes together in a single commit, but it's great
 to include several related changes, each in their own commit, in a
-single pull request.  If you notice an issue that is only somewhat
+single pull request. If you notice an issue that is only somewhat
 related to what you were working on, but you feel that it's too minor
 to create a dedicated pull request, feel free to append it as an
 additional commit in the pull request for your main project (that
 commit should have a clear explanation of the bug in its commit
-message).  This way, the bug gets fixed, but this independent change
-is highlighted for reviewers.  Or just create a dedicated pull request
-for it.  Whatever you do, don't squash unrelated changes together in a
+message). This way, the bug gets fixed, but this independent change
+is highlighted for reviewers. Or just create a dedicated pull request
+for it. Whatever you do, don't squash unrelated changes together in a
 single commit; the reviewer will ask you to split the changes out into
 their own commits.
 
@@ -91,21 +91,22 @@ First, check out
 of commits with good commit messages.
 
 The first line of the commit message is the **summary**. The summary:
-* is written in the imperative (e.g., "Fix ...", "Add ...")
-* is kept short (max 76 characters, ideally less), while concisely
+
+- is written in the imperative (e.g., "Fix ...", "Add ...")
+- is kept short (max 76 characters, ideally less), while concisely
   explaining what the commit does
-* is clear about what part of the code is affected -- often by prefixing
+- is clear about what part of the code is affected -- often by prefixing
   with the name of the subsystem and a colon, like "zjsunit: ..." or "docs: ..."
-* is a complete sentence.
+- is a complete sentence.
 
 ### Good summaries:
 
-Below is an example of a good commit summary line.  It starts with the
-prefix "provision:", using lowercase "**p**".  Next, "Improve performance of
+Below is an example of a good commit summary line. It starts with the
+prefix "provision:", using lowercase "**p**". Next, "Improve performance of
 install npm." starts with a capital "**I**", uses imperative tense,
 and ends with a period.
 
-> *provision: Improve performance of installing npm.*
+> _provision: Improve performance of installing npm._
 
 Here are some more positive examples:
 
@@ -121,16 +122,15 @@ Here are some more positive examples:
 
 > gather_subscriptions: Fix exception handling bad input.
 
+Compare "_gather_subscriptions: Fix exception handling bad input._" with:
 
-Compare "*gather_subscriptions: Fix exception handling bad input.*" with:
-
-* "*gather_subscriptions was broken*", which doesn't explain how
+- "_gather_subscriptions was broken_", which doesn't explain how
   it was broken (and isn't in the imperative)
-* "*Fix exception when given bad input*", in which it's impossible to
+- "_Fix exception when given bad input_", in which it's impossible to
   tell from the summary what part of the codebase was changed
-* "*gather_subscriptions: Fixing exception when given bad input.*",
+- "_gather_subscriptions: Fixing exception when given bad input._",
   not in the imperative
-* "*gather_subscriptions: Fixed exception when given bad input.*",
+- "_gather_subscriptions: Fixed exception when given bad input._",
   not in the imperative
 
 The summary is followed by a blank line, and then the body of the
@@ -143,29 +143,29 @@ automatically catch common mistakes in the commit message itself.
 
 ### Message body:
 
--   The body is written in prose, with full paragraphs; each paragraph should
-    be separated from the next by a single blank line.
--   The body explains:
-    -   why and how the change was made
-    -   any manual testing you did in addition to running the automated tests
-    -   any aspects of the commit that you think are questionable and
-        you'd like special attention applied to.
--   If the commit makes performance improvements, you should generally
-    include some rough benchmarks showing that it actually improves the
-    performance.
--   When you fix a GitHub issue, [mark that you've fixed the issue in
-    your commit
-    message](https://help.github.com/en/articles/closing-issues-via-commit-messages)
-    so that the issue is automatically closed when your code is merged.
-    Zulip's preferred style for this is to have the final paragraph of
-    the commit message read e.g. "Fixes: \#123.".
--   Avoid `Partially fixes #1234`; GitHub's regular expressions ignore
-    the "partially" and close the issue. `Fixes part of #1234` is a good alternative.
--   Any paragraph content in the commit message should be line-wrapped
-    to about 68 characters per line, but no more than 70, so that your
-    commit message will be reasonably readable in `git log` in a normal
-    terminal. You may find it helpful to:
-    - configure Git to use your preferred editor, with the EDITOR
+- The body is written in prose, with full paragraphs; each paragraph should
+  be separated from the next by a single blank line.
+- The body explains:
+  - why and how the change was made
+  - any manual testing you did in addition to running the automated tests
+  - any aspects of the commit that you think are questionable and
+    you'd like special attention applied to.
+- If the commit makes performance improvements, you should generally
+  include some rough benchmarks showing that it actually improves the
+  performance.
+- When you fix a GitHub issue, [mark that you've fixed the issue in
+  your commit
+  message](https://help.github.com/en/articles/closing-issues-via-commit-messages)
+  so that the issue is automatically closed when your code is merged.
+  Zulip's preferred style for this is to have the final paragraph of
+  the commit message read e.g. "Fixes: \#123.".
+- Avoid `Partially fixes #1234`; GitHub's regular expressions ignore
+  the "partially" and close the issue. `Fixes part of #1234` is a good alternative.
+- Any paragraph content in the commit message should be line-wrapped
+  to about 68 characters per line, but no more than 70, so that your
+  commit message will be reasonably readable in `git log` in a normal
+  terminal. You may find it helpful to:
+  - configure Git to use your preferred editor, with the EDITOR
     environment variable or `git config --global core.editor`, and
-    - configure the editor to automatically wrap text to 70 or fewer
+  - configure the editor to automatically wrap text to 70 or fewer
     columns per line (all text editors support this).

docs/contributing/zulipbot-usage.md

@@ -6,89 +6,89 @@ repositories in order to create a better workflow for Zulip contributors.
 
 Its purpose is to work around various limitations in GitHub's
 permissions and notifications systems to make it possible to have a
-much more democractic workflow for our contributors.  It allows anyone
+much more democractic workflow for our contributors. It allows anyone
 to self-assign or label an issue, not just the core contributors
 trusted with full write access to the repository (which is the only
 model GitHub supports).
 
 ## Usage
 
-* **Claim an issue** — Comment `@zulipbot claim` on the issue you want
-to claim; **@zulipbot** will assign you to the issue and label the issue as
-**in progress**.
+- **Claim an issue** — Comment `@zulipbot claim` on the issue you want
+  to claim; **@zulipbot** will assign you to the issue and label the issue as
+  **in progress**.
 
-    * If you're a new contributor, **@zulipbot** will give you read-only
+  - If you're a new contributor, **@zulipbot** will give you read-only
     collaborator access to the repository and leave a welcome message on the
     issue you claimed.
 
-    * You can also claim an issue that you've opened by including
+  - You can also claim an issue that you've opened by including
     `@zulipbot claim` in the body of your issue.
 
-    * If you accidentally claim an issue you didn't want to claim, comment
+  - If you accidentally claim an issue you didn't want to claim, comment
     `@zulipbot abandon` to abandon an issue.
 
-* **Label your issues** — Add appropriate labels to issues that you opened by
-including `@zulipbot add` in an issue comment or the body of your issue
-followed by the desired labels enclosed within double quotes (`""`).
+- **Label your issues** — Add appropriate labels to issues that you opened by
+  including `@zulipbot add` in an issue comment or the body of your issue
+  followed by the desired labels enclosed within double quotes (`""`).
 
-    * For example, to add the **bug** and **help wanted** labels to your
+  - For example, to add the **bug** and **help wanted** labels to your
     issue, comment or include `@zulipbot add "bug" "help wanted"` in the
     issue body.
 
-    * You'll receive an error message if you try to add any labels to your issue
+  - You'll receive an error message if you try to add any labels to your issue
     that don't exist in your repository.
 
-    * If you accidentally added the wrong labels, you can remove them by commenting
+  - If you accidentally added the wrong labels, you can remove them by commenting
     `@zulipbot remove` followed by the desired labels enclosed with double quotes
     (`""`).
 
-* **Find unclaimed issues** — Use the [GitHub search
-feature](https://help.github.com/en/articles/using-search-to-filter-issues-and-pull-requests)
-to find unclaimed issues by adding one of the following filters to your search:
+- **Find unclaimed issues** — Use the [GitHub search
+  feature](https://help.github.com/en/articles/using-search-to-filter-issues-and-pull-requests)
+  to find unclaimed issues by adding one of the following filters to your search:
 
-    * `-label: "in progress"` (excludes issues labeled with the **in progress** label)
+  - `-label: "in progress"` (excludes issues labeled with the **in progress** label)
 
-    * `no:assignee` (shows issues without assignees)
+  - `no:assignee` (shows issues without assignees)
 
-    Issues labeled with the **in progress** label and/or assigned to other users have
-    already been claimed.
+  Issues labeled with the **in progress** label and/or assigned to other users have
+  already been claimed.
 
-* **Collaborate in area label teams** — Receive notifications on
-issues and pull requests within your fields of expertise on the
-[Zulip server repository](https://github.com/zulip/zulip) by joining
-the Zulip server
-[area label teams](https://github.com/orgs/zulip/teams?utf8=✓&query=Server)
-(Note: this link only works for members of the Zulip organization;
-we'll happily add you if you're interested).  These teams correspond
-to the repository's
-[area labels](https://github.com/zulip/zulip/labels), although some
-teams are associated with multiple labels; for example, the **area:
-message-editing** and **area: message view** labels are both related
-to the
-[Server message view](https://github.com/orgs/zulip/teams/server-message-view)
-team.  Feel free to join as many area label teams as as you'd like!
+- **Collaborate in area label teams** — Receive notifications on
+  issues and pull requests within your fields of expertise on the
+  [Zulip server repository](https://github.com/zulip/zulip) by joining
+  the Zulip server
+  [area label teams](https://github.com/orgs/zulip/teams?utf8=✓&query=Server)
+  (Note: this link only works for members of the Zulip organization;
+  we'll happily add you if you're interested). These teams correspond
+  to the repository's
+  [area labels](https://github.com/zulip/zulip/labels), although some
+  teams are associated with multiple labels; for example, the **area:
+  message-editing** and **area: message view** labels are both related
+  to the
+  [Server message view](https://github.com/orgs/zulip/teams/server-message-view)
+  team. Feel free to join as many area label teams as as you'd like!
 
-    After your request to join an area label team is approved, you'll receive
-    notifications for any issues labeled with the team's corresponding area
-    label as well as any pull requests that reference issues labeled with your
-    team's area label.
+  After your request to join an area label team is approved, you'll receive
+  notifications for any issues labeled with the team's corresponding area
+  label as well as any pull requests that reference issues labeled with your
+  team's area label.
 
-* **Track inactive claimed issues** — If a claimed issue has not been updated
-for a week, **@zulipbot** will post a comment on the inactive issue to ask the
-assignee(s) if they are still working on the issue.
+- **Track inactive claimed issues** — If a claimed issue has not been updated
+  for a week, **@zulipbot** will post a comment on the inactive issue to ask the
+  assignee(s) if they are still working on the issue.
 
-    If you see this comment on an issue you claimed, you should post a comment
-    on the issue to notify **@zulipbot** that you're still working on it.
+  If you see this comment on an issue you claimed, you should post a comment
+  on the issue to notify **@zulipbot** that you're still working on it.
 
-    If **@zulipbot** does not receive a response from the assignee within 3 days
-    of an inactive issue prompt, **@zulipbot** will automatically remove the
-    issue's current assignee(s) and the "in progress" label to allow others to
-    work on an inactive issue.
+  If **@zulipbot** does not receive a response from the assignee within 3 days
+  of an inactive issue prompt, **@zulipbot** will automatically remove the
+  issue's current assignee(s) and the "in progress" label to allow others to
+  work on an inactive issue.
 
 ### Contributing
 
 If you wish to help develop and contribute to **@zulipbot**, check out the
 [zulip/zulipbot](https://github.com/zulip/zulipbot) repository on GitHub and read
 the project's [contributing
-guidelines](https://github.com/zulip/zulipbot/blob/master/.github/CONTRIBUTING.md#contributing) for
+guidelines](https://github.com/zulip/zulipbot/blob/main/.github/CONTRIBUTING.md#contributing) for
 more information.

docs/development/authentication.md

@@ -14,9 +14,9 @@ through the real flow.
 
 The steps to do this are a variation of the steps discussed in the
 production documentation, including the comments in
-`zproject/prod_settings_template.py`.  The differences here are driven
+`zproject/prod_settings_template.py`. The differences here are driven
 by the fact that `dev_settings.py` is in Git, so it is inconvenient
-for local [settings configuration](../subsystems/settings.md).  As a
+for local [settings configuration](../subsystems/settings.md). As a
 result, in the development environment, we allow setting certain
 settings in the untracked file `zproject/dev-secrets.conf` (which is
 also serves as `/etc/zulip/zulip-secrets.conf`).
@@ -28,105 +28,106 @@ methods supported by Zulip.
 
 Zulip's default EmailAuthBackend authenticates users by verifying
 control over their email address, and then allowing them to set a
-password for their account.  There are two development environment
+password for their account. There are two development environment
 details worth understanding:
 
-* All of our authentication flows in the development environment have
+- All of our authentication flows in the development environment have
   special links to the `/emails` page (advertised in `/devtools`),
   which shows all emails that the Zulip server has "sent" (emails are
   not actually sent by the development environment), to make it
   convenient to click through the UI of signup, password reset, etc.
-* There's a management command, `manage.py print_initial_password
-  username@example.com`, that prints out **default** passwords for the
-  development environment users.  Note that if you change a user's
-  password in the development environment, those passwords will no longer
-  work.  It also prints out the user's **current** API key.
+- There's a management command,
+  `manage.py print_initial_password username@example.com`, that prints
+  out **default** passwords for the development environment users.
+  Note that if you change a user's password in the development
+  environment, those passwords will no longer work. It also prints
+  out the user's **current** API key.
 
 ### Google
 
-* Visit [the Google developer
-console](https://console.developers.google.com) and navigate to "APIs
-& services" > "Credentials". Create a "Project", which will correspond
-to your dev environment.
+- Visit [the Google developer
+  console](https://console.developers.google.com) and navigate to "APIs
+  & services" > "Credentials". Create a "Project", which will correspond
+  to your dev environment.
 
-* Navigate to "APIs & services" > "Library", and find the "Identity
-  Toolkit API".  Choose "Enable".
+- Navigate to "APIs & services" > "Library", and find the "Identity
+  Toolkit API". Choose "Enable".
 
-* Return to "Credentials", and select "Create credentials".  Choose
+- Return to "Credentials", and select "Create credentials". Choose
   "OAuth client ID", and follow prompts to create a consent screen, etc.
   For "Authorized redirect URIs", fill in
   `http://zulipdev.com:9991/complete/google/` .
 
-* You should get a client ID and a client secret. Copy them. In
+- You should get a client ID and a client secret. Copy them. In
   `dev-secrets.conf`, set `social_auth_google_key` to the client ID
   and `social_auth_google_secret` to the client secret.
 
 ### GitHub
 
-* Register an OAuth2 application with GitHub at one of
+- Register an OAuth2 application with GitHub at one of
   <https://github.com/settings/developers> or
   <https://github.com/organizations/ORGNAME/settings/developers>.
   Specify `http://zulipdev.com:9991/complete/github/` as the callback URL.
 
-* You should get a page with settings for your new application,
-  showing a client ID and a client secret.  In `dev-secrets.conf`, set
+- You should get a page with settings for your new application,
+  showing a client ID and a client secret. In `dev-secrets.conf`, set
   `social_auth_github_key` to the client ID and `social_auth_github_secret`
   to the client secret.
 
 ### GitLab
 
-* Register an OAuth application with GitLab at
+- Register an OAuth application with GitLab at
   <https://gitlab.com/oauth/applications>.
   Specify `http://zulipdev.com:9991/complete/gitlab` as the callback URL.
 
-* You should get a page containing the Application ID and Secret for
-  your new application.  In `dev-secrets.conf`, enter the Application
+- You should get a page containing the Application ID and Secret for
+  your new application. In `dev-secrets.conf`, enter the Application
   ID as `social_auth_gitlab_key` and the Secret as
   `social_auth_gitlab_secret`.
 
 ### Apple
 
-* Visit <https://developer.apple.com/account/resources/>,
+- Visit <https://developer.apple.com/account/resources/>,
   Enable App ID and Create a Services ID with the instructions in
   <https://help.apple.com/developer-account/?lang=en#/dev1c0e25352> .
   When prompted for a "Return URL", enter
   `http://zulipdev.com:9991/complete/apple/` .
 
-* [Create a Sign in with Apple private key](https://help.apple.com/developer-account/?lang=en#/dev77c875b7e)
+- [Create a Sign in with Apple private key](https://help.apple.com/developer-account/?lang=en#/dev77c875b7e)
 
-* In `dev-secrets.conf`, set
-    * `social_auth_apple_services_id` to your
-      "Services ID" (eg. com.application.your).
-    * `social_auth_apple_app_id` to "App ID" or "Bundle ID".
-      This is only required if you are testing Apple auth on iOS.
-    * `social_auth_apple_key` to your "Key ID".
-    * `social_auth_apple_team` to your "Team ID".
-* Put the private key file you got from apple at the path
+- In `dev-secrets.conf`, set
+  - `social_auth_apple_services_id` to your
+    "Services ID" (eg. com.application.your).
+  - `social_auth_apple_app_id` to "App ID" or "Bundle ID".
+    This is only required if you are testing Apple auth on iOS.
+  - `social_auth_apple_key` to your "Key ID".
+  - `social_auth_apple_team` to your "Team ID".
+- Put the private key file you got from apple at the path
   `zproject/dev_apple.key`.
 
 ### SAML
 
-* Sign up for a [developer Okta account](https://developer.okta.com/).
-* Set up SAML authentication by following
+- Sign up for a [developer Okta account](https://developer.okta.com/).
+- Set up SAML authentication by following
   [Okta's documentation](https://developer.okta.com/docs/guides/saml-application-setup/overview/).
   Specify:
-    * `http://localhost:9991/complete/saml/` for the "Single sign on URL"`.
-    * `http://localhost:9991` for the "Audience URI (SP Entity ID)".
-    * Skip "Default RelayState".
-    * Skip "Name ID format".
-    * Set 'Email` for "Application username format".
-    * Provide "Attribute statements" of `email` to `user.email`,
-      `first_name` to `user.firstName`, and `last_name` to `user.lastName`.
-* Assign at least one account in the "Assignments" tab. You'll use it for
+  - `http://localhost:9991/complete/saml/` for the "Single sign on URL"`.
+  - `http://localhost:9991` for the "Audience URI (SP Entity ID)".
+  - Skip "Default RelayState".
+  - Skip "Name ID format".
+  - Set 'Email` for "Application username format".
+  - Provide "Attribute statements" of `email` to `user.email`,
+    `first_name` to `user.firstName`, and `last_name` to `user.lastName`.
+- Assign at least one account in the "Assignments" tab. You'll use it for
   signing up / logging in to Zulip.
-* Visit the big "Setup instructions" button on the "Sign on" tab.
-* Edit `zproject/dev-secrets.conf` to add the two values provided:
-    * Set `saml_url = http...` from "Identity Provider Single Sign-On
-      URL".
-    * Set `saml_entity_id = http://...` from "Identity Provider Issuer".
-    * Download the certificate and put it at the path `zproject/dev_saml.cert`.
-* Now you should have working SAML authentication!
-* You can sign up to the target realm with the account that you've "assigned"
+- Visit the big "Setup instructions" button on the "Sign on" tab.
+- Edit `zproject/dev-secrets.conf` to add the two values provided:
+  - Set `saml_url = http...` from "Identity Provider Single Sign-On
+    URL".
+  - Set `saml_entity_id = http://...` from "Identity Provider Issuer".
+  - Download the certificate and put it at the path `zproject/dev_saml.cert`.
+- Now you should have working SAML authentication!
+- You can sign up to the target realm with the account that you've "assigned"
   in the previous steps (if the account's email address is allowed in the realm,
   so you may have to change the realm settings to allow the appropriate email domain)
   and then you'll be able to log in freely. Alternatively, you can create an account
@@ -136,7 +137,7 @@ to your dev environment.
 
 Some OAuth providers (such as Facebook) require HTTPS on the callback
 URL they post back to, which isn't supported directly by the Zulip
-development environment.  If you run a
+development environment. If you run a
 [remote Zulip development server](../development/remote.md), we have
 instructions for
 [an nginx reverse proxy with SSL](../development/remote.html#using-an-nginx-reverse-proxy)
@@ -147,23 +148,24 @@ that you can use for your development efforts.
 Before Zulip 2.0, one of the more common classes of bug reports with
 Zulip's authentication was users having trouble getting [LDAP
 authentication](../production/authentication-methods.html#ldap-including-active-directory)
-working.  The root cause was because setting up a local LDAP server
+working. The root cause was because setting up a local LDAP server
 for development was difficult, which meant most developers were unable
 to work on fixing even simple issues with it.
 
 We solved this problem for our unit tests long ago by using the
-popular [fakeldap](https://github.com/zulip/fakeldap) library.  And in
+popular [fakeldap](https://github.com/zulip/fakeldap) library. And in
 2018, we added convenient support for using fakeldap in the Zulip
 development environment as well, so that you can go through all the
 actual flows for LDAP configuration.
 
 - To enable fakeldap, set `FAKE_LDAP_MODE` in
-`zproject/dev_settings.py` to one of the following options.  For more
-information on these modes, refer to
-[our production docs](../production/authentication-methods.html#ldap-including-active-directory):
+  `zproject/dev_settings.py` to one of the following options. For more
+  information on these modes, refer to
+  [our production docs](../production/authentication-methods.html#ldap-including-active-directory):
+
   - `a`: If users' email addresses are in LDAP and used as username.
   - `b`: If LDAP only has usernames but email addresses are of the form
-  username@example.com
+    username@example.com
   - `c`: If LDAP usernames are completely unrelated to email addresses.
 
 - To disable fakeldap, set `FAKE_LDAP_MODE` back to `None`.
@@ -173,8 +175,8 @@ information on these modes, refer to
   `ldapuser1`).
 
 - `FAKE_LDAP_NUM_USERS` in `zproject/dev_settings.py` can be used to
-specify the number of LDAP users to be added. The default value for
-the number of LDAP users is 8.
+  specify the number of LDAP users to be added. The default value for
+  the number of LDAP users is 8.
 
 ### Testing avatar and custom profile field synchronization
 
@@ -184,14 +186,14 @@ contain data one might want to sync, including avatars and custom
 profile fields.
 
 We also have configured `AUTH_LDAP_USER_ATTR_MAP` in
-`zproject/dev_settings.py` to sync several of those fields.  For
+`zproject/dev_settings.py` to sync several of those fields. For
 example:
 
-* Modes `a` and `b` will set the user's avatar on account creation and
+- Modes `a` and `b` will set the user's avatar on account creation and
   update it when `manage.py sync_ldap_user_data` is run.
-* Mode `b` is configured to automatically have the `birthday` and
+- Mode `b` is configured to automatically have the `birthday` and
   `Phone number` custom profile fields populated/synced.
-* Mode `a` is configured to deactivate/reactivate users whose accounts
+- Mode `a` is configured to deactivate/reactivate users whose accounts
   are disabled in LDAP when `manage.py sync_ldap_user_data` is run.
   (Note that you'll likely need to edit
   `zerver/lib/dev_ldap_directory.py` to ensure there are some accounts
@@ -202,7 +204,7 @@ example:
 For our automated tests, we generally configure custom LDAP data for
 each individual test, because that generally means one can understand
 exactly what data is being used in the test without looking at other
-resources.  It also gives us more freedom to edit the development
+resources. It also gives us more freedom to edit the development
 environment directory without worrying about tests.
 
 ## Two factor authentication
@@ -212,13 +214,13 @@ Zulip uses [django-two-factor-auth][0] as a beta 2FA integration.
 To enable 2FA, set `TWO_FACTOR_AUTHENTICATION_ENABLED` in settings to
 `True`, then log in to Zulip and add an OTP device from the settings
 page. Once the device is added, password based authentication will ask
-for a one-time-password.  In the development environment, this
+for a one-time-password. In the development environment, this
 one-time-password will be printed to the console when you try to
-log in.  Just copy-paste it into the form field to continue.
+log in. Just copy-paste it into the form field to continue.
 
 Direct development logins don't prompt for 2FA one-time-passwords, so
 to test 2FA in development, make sure that you log in using a
-password.  You can get the passwords for the default test users using
+password. You can get the passwords for the default test users using
 `./manage.py print_initial_password`.
 
 ## Password form implementation
@@ -226,7 +228,7 @@ password.  You can get the passwords for the default test users using
 By default, Zulip uses `autocomplete=off` for password fields where we
 enter the current password, and `autocomplete="new-password"` for
 password fields where we create a new account or change the existing
-password.  This prevents the browser from auto-filling the existing
+password. This prevents the browser from auto-filling the existing
 password.
 
 Visit <https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete> for more details.

docs/development/overview.md

@@ -28,8 +28,8 @@ performs well.
 Zulip also supports a wide range of ways to install the Zulip
 development environment:
 
-* On Linux platforms, you can **[install directly][install-direct]**.
-* On Windows, you can **[install directly][install-via-wsl]** via WSL 2.
+- On Linux platforms, you can **[install directly][install-direct]**.
+- On Windows, you can **[install directly][install-via-wsl]** via WSL 2.
 
 ## Slow internet connections
 
@@ -65,8 +65,8 @@ need to.
 Once you've installed the Zulip development environment, you'll want
 to read these documents to learn how to use it:
 
-* [Using the development environment][using-dev-env]
-* [Testing][testing] (and [Configuring CI][ci])
+- [Using the development environment][using-dev-env]
+- [Testing][testing] (and [Configuring CI][ci])
 
 And if you've set up the Zulip development environment on a remote
 machine, take a look at our tips for

docs/development/remote.md

@@ -16,12 +16,12 @@ need to.
 
 The best way to connect to your server is using the command line tool `ssh`.
 
-* On macOS and Linux/UNIX, `ssh` is a part of Terminal.
-* On Windows, `ssh` comes with [Bash for Git][git-bash].
+- On macOS and Linux/UNIX, `ssh` is a part of Terminal.
+- On Windows, `ssh` comes with [Bash for Git][git-bash].
 
-Open *Terminal* or *Bash for Git*, and connect with the following:
+Open _Terminal_ or _Bash for Git_, and connect with the following:
 
-```
+```console
 $ ssh username@host
 ```
 
@@ -32,19 +32,20 @@ networks.
 ## Setting up user accounts
 
 You will need a non-root user account with sudo privileges to set up
-the Zulip development environment.  If you have one already, continue
+the Zulip development environment. If you have one already, continue
 to the next section.
 
 You can create a new user with sudo privileges by running the
 following commands as root:
-* You can create a `zulipdev` user by running the command `adduser
-zulipdev`. Run through the prompts to assign a password and user
-information.  (You can pick any username you like for this user
-account.)
-* You can add the user to the sudo group by running the command
-`usermod -aG sudo zulipdev`.
-* Finally, you can switch to the user by running the command `su -
-zulipdev` (or just log in to that user using `ssh`).
+
+- You can create a `zulipdev` user by running the command
+  `adduser zulipdev`. Run through the prompts to assign a password and
+  user information. (You can pick any username you like for this user
+  account.)
+- You can add the user to the sudo group by running the command
+  `usermod -aG sudo zulipdev`.
+- Finally, you can switch to the user by running the command
+  `su - zulipdev` (or just log in to that user using `ssh`).
 
 ## Setting up the development environment
 
@@ -75,7 +76,7 @@ Once you have set up the development environment, you can start up the
 development server with the following command in the directory where
 you cloned Zulip:
 
-```
+```bash
 ./tools/run-dev.py --interface=''
 ```
 
@@ -93,12 +94,12 @@ developing on your laptop).
 To properly secure your remote development environment, you can
 [port forward](https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding)
 using ssh instead of running the development environment on an exposed
-interface.  For example, if you're running Zulip on a remote server
+interface. For example, if you're running Zulip on a remote server
 such as a DigitalOcean Droplet or an AWS EC2 instance, you can set up
 port-forwarding to access Zulip by running the following command in
 your terminal:
 
-```
+```bash
 ssh -L 3000:127.0.0.1:9991 <username>@<remote_server_ip> -N
 ```
 
@@ -112,10 +113,10 @@ environment][rtd-using-dev-env].
 
 To see changes on your remote development server, you need to do one of the following:
 
-* [Edit locally](#editing-locally): Clone Zulip code to your computer and
+- [Edit locally](#editing-locally): Clone Zulip code to your computer and
   then use your favorite editor to make changes. When you want to see changes
   on your remote Zulip development instance, sync with Git.
-* [Edit remotely](#editing-remotely): Edit code directly on your remote
+- [Edit remotely](#editing-remotely): Edit code directly on your remote
   Zulip development instance using a [Web-based IDE](#web-based-ide) (recommended for
   beginners) or a [command line editor](#command-line-editors), or a
   [desktop IDE](#desktop-gui-editors) using a plugin to sync your
@@ -126,12 +127,12 @@ To see changes on your remote development server, you need to do one of the foll
 If you want to edit code locally install your favorite text editor. If you
 don't have a favorite, here are some suggestions:
 
-* [atom](https://atom.io/)
-* [emacs](https://www.gnu.org/software/emacs/)
-* [vim](https://www.vim.org/)
-* [spacemacs](https://github.com/syl20bnr/spacemacs)
-* [sublime](https://www.sublimetext.com/)
-* [PyCharm](https://www.jetbrains.com/pycharm/)
+- [atom](https://atom.io/)
+- [emacs](https://www.gnu.org/software/emacs/)
+- [vim](https://www.vim.org/)
+- [spacemacs](https://github.com/syl20bnr/spacemacs)
+- [sublime](https://www.sublimetext.com/)
+- [PyCharm](https://www.jetbrains.com/pycharm/)
 
 Next, follow our [Git and GitHub guide](../git/index.md) to clone and configure
 your fork of zulip on your local computer.
@@ -149,7 +150,7 @@ guide][rtd-git-guide]. In brief, the steps are as follows.
 
 On your **local computer**:
 
-1. Open *Terminal* (macOS/Linux) or *Git for BASH*.
+1. Open _Terminal_ (macOS/Linux) or _Git for BASH_.
 2. Change directory to where you cloned Zulip (e.g. `cd zulip`).
 3. Use `git add` and `git commit` to stage and commit your changes (if you
    haven't already).
@@ -160,7 +161,7 @@ Be sure to replace `branchname` with the name of your actual feature branch.
 Once `git push` has completed successfully, you are ready to fetch the commits
 from your remote development instance:
 
-1. In *Terminal* or *Git BASH*, connect to your remote development
+1. In _Terminal_ or _Git BASH_, connect to your remote development
    instance with `ssh user@host`.
 2. Change to the zulip directory (e.g., `cd zulip`).
 3. Fetch new commits from GitHub with `git fetch origin`.
@@ -172,10 +173,10 @@ from your remote development instance:
 There are a few good ways to edit code in your remote development
 environment:
 
-* With a command-line editor like vim or emacs run over SSH.
-* With a desktop GUI editor like VS Code or Atom and a plugin for
+- With a command-line editor like vim or emacs run over SSH.
+- With a desktop GUI editor like VS Code or Atom and a plugin for
   syncing your changes to the remote server.
-* With a web-based IDE like CodeAnywhere.
+- With a web-based IDE like CodeAnywhere.
 
 We document these options below; we recommend using whatever editor
 you prefer for development in general.
@@ -193,16 +194,17 @@ Similar packages/extensions exist for other popular code editors as
 well; contributions of precise documentation for them are welcome!
 
 - [VSCode Remote - SSH][vscode-remote-ssh]: Lets you use Visual Studio
-Code against a remote repository with a similar user experience to
-developing locally.
+  Code against a remote repository with a similar user experience to
+  developing locally.
 
 [vscode-remote-ssh]: https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-ssh
 
 - [rmate](https://github.com/textmate/rmate) for TextMate + VS Code:
+
 1. Install the extension
    [Remote VSCode](https://marketplace.visualstudio.com/items?itemName=rafaelmaiolla.remote-vscode).
 2. On your remote machine, run:
-   ```
+   ```console
    $ mkdir -p ~/bin
    $ curl -Lo ~/bin/rmate https://raw.githubusercontent.com/textmate/rmate/master/bin/rmate
    $ chmod a+x ~/bin/rmate
@@ -210,11 +212,11 @@ developing locally.
 3. Make sure the remote server is running in VS Code (you can
    force-start through the Command Palette).
 4. SSH to your remote machine using
-   ```
+   ```console
    $ ssh -R 52698:localhost:52698 user@example.org
    ```
 5. On your remote machine, run
-   ```
+   ```console
    $ rmate [options] file
    ```
    and the file should open up in VS Code. Any changes you make now will be saved remotely.
@@ -226,20 +228,20 @@ a command line text editor on the remote machine.
 
 Two editors often available by default on Linux systems are:
 
-* **Nano**: A very simple, beginner-friendly editor. However, it lacks a lot of
+- **Nano**: A very simple, beginner-friendly editor. However, it lacks a lot of
   features useful for programming, such as syntax highlighting, so we only
   recommended it for quick edits to things like configuration files. Launch by
-  running command `nano <filename>`. Exit by pressing *Ctrl-X*.
+  running command `nano <filename>`. Exit by pressing _Ctrl-X_.
 
-* **[Vim](https://www.vim.org/)**: A very powerful editor that can take a while
-  to learn. Launch by running `vim <filename>`. Quit Vim by pressing *Esc*,
-  typing `:q`, and then pressing *Enter*. Vim comes with a program to learn it
+- **[Vim](https://www.vim.org/)**: A very powerful editor that can take a while
+  to learn. Launch by running `vim <filename>`. Quit Vim by pressing _Esc_,
+  typing `:q`, and then pressing _Enter_. Vim comes with a program to learn it
   called `vimtutor` (just run that command to start it).
 
 Other options include:
 
-* [emacs](https://www.gnu.org/software/emacs/)
-* [spacemacs](https://github.com/syl20bnr/spacemacs)
+- [emacs](https://www.gnu.org/software/emacs/)
+- [spacemacs](https://github.com/syl20bnr/spacemacs)
 
 ##### Web-based IDE
 
@@ -250,12 +252,12 @@ started working quickly, we recommend web-based IDE
 To set up Codeanywhere for Zulip:
 
 1. Create a [Codeanywhere][codeanywhere] account and log in.
-2. Create a new **SFTP-SSH** project. Use *Public key* for authentication.
+2. Create a new **SFTP-SSH** project. Use _Public key_ for authentication.
 3. Click **GET YOUR PUBLIC KEY** to get the new public key that
    Codeanywhere generates when you create a new project. Add this public key to
    `~/.ssh/authorized_keys` on your remote development instance.
 4. Once you've added the new public key to your remote development instance, click
-   *CONNECT*.
+   _CONNECT_.
 
 Now your workspace should look similar this:
 ![Codeanywhere workspace][img-ca-workspace]
@@ -264,9 +266,9 @@ Now your workspace should look similar this:
 
 Next, read the following to learn more about developing for Zulip:
 
-* [Git & GitHub guide][rtd-git-guide]
-* [Using the development environment][rtd-using-dev-env]
-* [Testing][rtd-testing]
+- [Git & GitHub guide][rtd-git-guide]
+- [Using the development environment][rtd-using-dev-env]
+- [Testing][rtd-testing]
 
 [install-direct]: ../development/setup-advanced.html#installing-directly-on-ubuntu-debian-centos-or-fedora
 [install-vagrant]: ../development/setup-vagrant.md
@@ -282,7 +284,7 @@ Next, read the following to learn more about developing for Zulip:
 
 For some applications (e.g. developing an OAuth2 integration for
 Facebook), you may need your Zulip development to have a valid SSL
-certificate.  While `run-dev.py` doesn't support that, you can do this
+certificate. While `run-dev.py` doesn't support that, you can do this
 with an `nginx` reverse proxy sitting in front of `run-dev.py.`.
 
 The following instructions assume you have a Zulip Droplet working and
@@ -290,32 +292,33 @@ that the user is `zulipdev`; edit accordingly if the situation is
 different.
 
 1. First, get an SSL certificate; you can use
-    [our certbot wrapper script used for production](../production/ssl-certificates.html#certbot-recommended)
-    by running the following commands as root:
-    ```
-    # apt install -y crudini
-    mkdir -p /var/lib/zulip/certbot-webroot/
-    # if nginx running this will fail and you need to run `service nginx stop`
-    /home/zulipdev/zulip/scripts/setup/setup-certbot \
-      hostname.example.com --no-zulip-conf \
-      --email=username@example.com --method=standalone
-    ```
+   [our certbot wrapper script used for production](../production/ssl-certificates.html#certbot-recommended)
+   by running the following commands as root:
+
+   ```bash
+   # apt install -y crudini
+   mkdir -p /var/lib/zulip/certbot-webroot/
+   # if nginx running this will fail and you need to run `service nginx stop`
+   /home/zulipdev/zulip/scripts/setup/setup-certbot \
+     hostname.example.com \
+     --email=username@example.com --method=standalone
+   ```
 
 1. Install nginx configuration:
 
-    ```
-    apt install -y nginx-full
-    cp -a /home/zulipdev/zulip/tools/droplets/zulipdev /etc/nginx/sites-available/
-    ln -nsf /etc/nginx/sites-available/zulipdev /etc/nginx/sites-enabled/
-    nginx -t  # Verifies your nginx configuration
-    service nginx reload  # Actually enabled your nginx configuration
-    ```
+   ```bash
+   apt install -y nginx-full
+   cp -a /home/zulipdev/zulip/tools/droplets/zulipdev /etc/nginx/sites-available/
+   ln -nsf /etc/nginx/sites-available/zulipdev /etc/nginx/sites-enabled/
+   nginx -t  # Verifies your nginx configuration
+   service nginx reload  # Actually enabled your nginx configuration
+   ```
 
-1. Edit `zproject/dev_settings.py` to set `EXTERNAL_URI_SCHEME =
-   "https://"`, so that URLs served by the development environment
-   will be HTTPS.
+1. Edit `zproject/dev_settings.py` to set
+   `EXTERNAL_URI_SCHEME = "https://"`, so that URLs served by the
+   development environment will be HTTPS.
 
 1. Start the Zulip development environment with the following command:
-   ```
+   ```bash
    env EXTERNAL_HOST="hostname.example.com" ./tools/run-dev.py --interface=''
    ```

docs/development/request-remote.md

@@ -1,4 +1,4 @@
-```eval_rst
+```{eval-rst}
 :orphan:
 ```
 
@@ -70,14 +70,14 @@ Once your remote dev instance is ready:
 
 Once you've confirmed you can connect to your remote server, take a look at:
 
-* [developing remotely](../development/remote.md) for tips on using the remote dev
+- [developing remotely](../development/remote.md) for tips on using the remote dev
   instance, and
-* our [Git & GitHub guide](../git/index.md) to learn how to use Git with Zulip.
+- our [Git & GitHub guide](../git/index.md) to learn how to use Git with Zulip.
 
 Next, read the following to learn more about developing for Zulip:
 
-* [Using the development environment](../development/using.md)
-* [Testing](../testing/testing.md)
+- [Using the development environment](../development/using.md)
+- [Testing](../testing/testing.md)
 
 [github-join]: https://github.com/join
 [github-help-add-ssh-key]: https://help.github.com/en/articles/adding-a-new-ssh-key-to-your-github-account

docs/development/setup-advanced.md

@@ -2,22 +2,22 @@
 
 Contents:
 
-* [Installing directly on Ubuntu, Debian, CentOS, or Fedora](#installing-directly-on-ubuntu-debian-centos-or-fedora)
-* [Installing directly on Windows 10 with WSL 2](#installing-directly-on-windows-10-with-wsl-2)
-* [Using the Vagrant Hyper-V provider on Windows](#using-the-vagrant-hyper-v-provider-on-windows-beta)
-* [Newer versions of supported platforms](#newer-versions-of-supported-platforms)
-* [Installing directly on cloud9](#installing-on-cloud9)
+- [Installing directly on Ubuntu, Debian, CentOS, or Fedora](#installing-directly-on-ubuntu-debian-centos-or-fedora)
+- [Installing directly on Windows 10 with WSL 2](#installing-directly-on-windows-10-with-wsl-2)
+- [Using the Vagrant Hyper-V provider on Windows](#using-the-vagrant-hyper-v-provider-on-windows-beta)
+- [Newer versions of supported platforms](#newer-versions-of-supported-platforms)
+- [Installing directly on cloud9](#installing-on-cloud9)
 
 ## Installing directly on Ubuntu, Debian, CentOS, or Fedora
 
 If you'd like to install a Zulip development environment on a computer
 that's running one of:
 
-* Ubuntu 20.04 Focal, 18.04 Bionic
-* Debian 10 Buster, 11 Bullseye (beta)
-* CentOS 7 (beta)
-* Fedora 33 (beta)
-* RHEL 7 (beta)
+- Ubuntu 20.04 Focal, 18.04 Bionic
+- Debian 10 Buster, 11 Bullseye (beta)
+- CentOS 7 (beta)
+- Fedora 33 (beta)
+- RHEL 7 (beta)
 
 You can just run the Zulip provision script on your machine.
 
@@ -26,23 +26,22 @@ If you are using a [remote server](../development/remote.md), see
 the
 [section on creating appropriate user accounts](../development/remote.html#setting-up-user-accounts).
 
-```eval_rst
-.. warning::
-    There is no supported uninstallation process with this
-    method.  If you want that, use the Vagrant environment, where you can
-    just do `vagrant destroy` to clean up the development environment.
-```
+:::{warning}
+There is no supported uninstallation process with this
+method. If you want that, use the Vagrant environment, where you can
+just do `vagrant destroy` to clean up the development environment.
+:::
 
 Start by [cloning your fork of the Zulip repository][zulip-rtd-git-cloning]
 and [connecting the Zulip upstream repository][zulip-rtd-git-connect]:
 
-```
+```bash
 git clone --config pull.rebase git@github.com:YOURUSERNAME/zulip.git
 cd zulip
 git remote add -f upstream https://github.com/zulip/zulip.git
 ```
 
-```
+```bash
 # On CentOS/RHEL, you must first install epel-release, and then python36,
 # and finally you must run `sudo ln -nsf /usr/bin/python36 /usr/bin/python3`
 # On Fedora, you must first install python3
@@ -64,27 +63,27 @@ the [WSL 2](https://docs.microsoft.com/en-us/windows/wsl/wsl2-about)
 installation method described here.
 
 1. Install WSL 2 by following the instructions provided by Microsoft
-[here](https://docs.microsoft.com/en-us/windows/wsl/wsl2-install).
+   [here](https://docs.microsoft.com/en-us/windows/wsl/wsl2-install).
 
 1. Install the `Ubuntu 18.04` Linux distribution from the Microsoft
    Store.
 
 1. Launch the `Ubuntu 18.04` shell and run the following commands:
 
-   ```
+   ```bash
    sudo apt update && sudo apt upgrade
    sudo apt install rabbitmq-server memcached redis-server postgresql
    ```
 
 1. Open `/etc/rabbitmq/rabbitmq-env.conf` using e.g.:
 
-   ```
+   ```bash
    sudo vim /etc/rabbitmq/rabbitmq-env.conf
    ```
 
    Add the following lines at the end of your file and save:
 
-   ```
+   ```ini
    NODE_IP_ADDRESS=127.0.0.1
    NODE_PORT=5672
    ```
@@ -92,14 +91,15 @@ installation method described here.
 1. Make sure you are inside the WSL disk and not in a Windows mounted disk.
    You will run into permission issues if you run `provision` from `zulip`
    in a Windows mounted disk.
-   ```
+
+   ```bash
    cd ~  # or cd /home/USERNAME
    ```
 
 1. [Clone your fork of the Zulip repository][zulip-rtd-git-cloning]
    and [connecting the Zulip upstream repository][zulip-rtd-git-connect]:
 
-   ```
+   ```bash
    git clone --config pull.rebase git@github.com:YOURUSERNAME/zulip.git ~/zulip
    cd zulip
    git remote add -f upstream https://github.com/zulip/zulip.git
@@ -109,7 +109,7 @@ installation method described here.
    start it (click `Allow access` if you get popups for Windows Firewall
    blocking some services)
 
-   ```
+   ```bash
    # Start database, cache, and other services
    ./tools/wsl/start_services
    # Install/update the Zulip development environment
@@ -120,11 +120,10 @@ installation method described here.
    ./tools/run-dev.py
    ```
 
-   ```eval_rst
-   .. note::
-       If you shut down WSL, after starting it again, you will have to manually start
-       the services using ``./tools/wsl/start_services``.
-   ```
+   :::{note}
+   If you shut down WSL, after starting it again, you will have to manually start
+   the services using `./tools/wsl/start_services`.
+   :::
 
 1. If you are facing problems or you see error messages after running `./tools/run-dev.py`,
    you can try running `./tools/provision` again.
@@ -132,7 +131,7 @@ installation method described here.
 1. [Visual Studio Code Remote - WSL](https://code.visualstudio.com/docs/remote/wsl) is
    recommended for editing files when developing with WSL.
 
-1. You're done!  You can pick up the [documentation on using the
+1. You're done! You can pick up the [documentation on using the
    Zulip development
    environment](../development/setup-vagrant.html#step-4-developing),
    ignoring the parts about `vagrant` (since you're not using it).
@@ -154,7 +153,7 @@ expected.
 1. Start by [cloning your fork of the Zulip repository][zulip-rtd-git-cloning]
    and [connecting the Zulip upstream repository][zulip-rtd-git-connect]:
 
-   ```
+   ```bash
    git clone --config pull.rebase git@github.com:YOURUSERNAME/zulip.git
    cd zulip
    git remote add -f upstream https://github.com/zulip/zulip.git
@@ -169,7 +168,7 @@ expected.
 
    You should get output like this:
 
-   ```text
+   ```console
    Bringing machine 'default' up with 'hyperv' provider...
    ==> default: Verifying Hyper-V is enabled...
    ==> default: Verifying Hyper-V is accessible...
@@ -203,36 +202,35 @@ expected.
 
 1. Set the `EXTERNAL_HOST` environment variable.
 
-   ```bash
+   ```console
    (zulip-py3-venv) vagrant@ubuntu-18:/srv/zulip$ export EXTERNAL_HOST="$(hostname -I | xargs):9991"
    (zulip-py3-venv) vagrant@ubuntu-18:/srv/zulip$ echo $EXTERNAL_HOST
    ```
 
    The output will be like:
 
-   ```text
+   ```console
    172.28.122.156:9991
    ```
 
    Make sure you note down this down. This is where your zulip development web
    server can be accessed.
 
-   ```eval_rst
-   .. important::
-      The output of the above command changes every time you restart the Vagrant
-      development machine. Thus, it will have to be run every time you bring one up.
-      This quirk is one reason this method is marked experimental.
-   ```
+   :::{important}
+   The output of the above command changes every time you restart the Vagrant
+   development machine. Thus, it will have to be run every time you bring one up.
+   This quirk is one reason this method is marked experimental.
+   :::
 
 1. You should now be able to start the Zulip development server.
 
-   ```bash
+   ```console
    (zulip-py3-venv) vagrant@ubuntu-18:/srv/zulip$ ./tools/run-dev.py
    ```
 
    The output will look like:
 
-   ```text
+   ```console
    Starting Zulip on:
 
         http://172.30.24.235:9991/
@@ -253,11 +251,11 @@ expected.
 
 1. If you get the error `Hyper-V could not initialize memory`, this is
    likely because your system has insufficient free memory to start
-   the virtual machine.  You can generally work around this error by
-   closing all other running programs and running `vagrant up
-   --provider=hyperv` again. You can reopen the other programs after
-   the provisioning is completed. If it still isn't enough, try
-   restarting your system and running the command again.
+   the virtual machine. You can generally work around this error by
+   closing all other running programs and running
+   `vagrant up --provider=hyperv` again. You can reopen the other
+   programs after the provisioning is completed. If it still isn't
+   enough, try restarting your system and running the command again.
 
 2. Be patient the first time you run `./tools/run-dev.py`.
 
@@ -276,7 +274,7 @@ these platforms reliably and easily, so we no longer maintain manual
 installation instructions for these platforms.
 
 If `tools/provision` doesn't yet support a newer release of Debian or
-Ubuntu that you're using, we'd love to add support for it.  It's
+Ubuntu that you're using, we'd love to add support for it. It's
 likely only a few lines of changes to `tools/lib/provision.py` and
 `scripts/lib/setup-apt-repo` if you'd like to do it yourself and
 submit a pull request, or you can ask for help in
@@ -291,20 +289,21 @@ that lets you write, run, and debug your code with just a browser. It
 includes a code editor, debugger, and terminal.
 
 This section documents how to set up the Zulip development environment
-in a Cloud9 workspace.  If you don't have an existing Cloud9 account,
+in a Cloud9 workspace. If you don't have an existing Cloud9 account,
 you can sign up [here](https://aws.amazon.com/cloud9/).
 
-* Create a Workspace, and select the blank template.
-* Resize the workspace to be 1GB of memory and 4GB of disk
+- Create a Workspace, and select the blank template.
+- Resize the workspace to be 1GB of memory and 4GB of disk
   space. (This is under free limit for both the old Cloud9 and the AWS
   Free Tier).
-* Clone the zulip repo: `git clone --config pull.rebase
-  https://github.com/<your-username>/zulip.git`
-* Restart rabbitmq-server since its broken on Cloud9: `sudo service
-  rabbitmq-server restart`.
-* And run provision `cd zulip && ./tools/provision`, once this is done.
-* Activate the Zulip virtual environment by `source
-  /srv/zulip-py3-venv/bin/activate` or by opening a new terminal.
+- Clone the zulip repo:
+  `git clone --config pull.rebase https://github.com/<your-username>/zulip.git`
+- Restart rabbitmq-server since its broken on Cloud9:
+  `sudo service rabbitmq-server restart`.
+- And run provision `cd zulip && ./tools/provision`, once this is done.
+- Activate the Zulip virtual environment by
+  `source /srv/zulip-py3-venv/bin/activate` or by opening a new
+  terminal.
 
 #### Install zulip-cloud9
 
@@ -312,7 +311,7 @@ There's a NPM package, `zulip-cloud9`, that provides a wrapper around
 the Zulip development server for use in the Cloud9 environment.
 
 Note: `npm i -g zulip-cloud9` does not work in zulip's virtual
-environment.  Although by default, any packages installed in workspace
+environment. Although by default, any packages installed in workspace
 folder (i.e. the top level folder) are added to `$PATH`.
 
 ```bash
@@ -325,7 +324,7 @@ If you get error of the form `bash: cannot find command zulip-dev`,
 you need to start a new terminal.
 
 Your development server would be running at
-`https://<workspace-name>-<username>.c9users.io` on port 8080.  You
+`https://<workspace-name>-<username>.c9users.io` on port 8080. You
 dont need to add `:8080` to your URL, since the Cloud9 proxy should
 automatically forward the connection. You might want to visit
 [zulip-cloud9 repo](https://github.com/cPhost/zulip-cloud9) and it's

docs/development/setup-vagrant.md

@@ -10,16 +10,17 @@ or a Linux container (for Ubuntu) inside which the Zulip server and
 all related services will run.
 
 Contents:
-* [Requirements](#requirements)
-* [Step 0: Set up Git & GitHub](#step-0-set-up-git-github)
-* [Step 1: Install prerequisites](#step-1-install-prerequisites)
-* [Step 2: Get Zulip code](#step-2-get-zulip-code)
-* [Step 3: Start the development environment](#step-3-start-the-development-environment)
-* [Step 4: Developing](#step-4-developing)
-* [Troubleshooting and common errors](#troubleshooting-and-common-errors)
-* [Specifying an Ubuntu mirror](#specifying-an-ubuntu-mirror)
-* [Specifying a proxy](#specifying-a-proxy)
-* [Customizing CPU and RAM allocation](#customizing-cpu-and-ram-allocation)
+
+- [Requirements](#requirements)
+- [Step 0: Set up Git & GitHub](#step-0-set-up-git-github)
+- [Step 1: Install prerequisites](#step-1-install-prerequisites)
+- [Step 2: Get Zulip code](#step-2-get-zulip-code)
+- [Step 3: Start the development environment](#step-3-start-the-development-environment)
+- [Step 4: Developing](#step-4-developing)
+- [Troubleshooting and common errors](#troubleshooting-and-common-errors)
+- [Specifying an Ubuntu mirror](#specifying-an-ubuntu-mirror)
+- [Specifying a proxy](#specifying-a-proxy)
+- [Customizing CPU and RAM allocation](#customizing-cpu-and-ram-allocation)
 
 **If you encounter errors installing the Zulip development
 environment,** check [troubleshooting and common
@@ -32,10 +33,10 @@ server](../contributing/chat-zulip-org.md) for real-time help or
 
 When reporting your issue, please include the following information:
 
-* host operating system
-* installation method (Vagrant or direct)
-* whether or not you are using a proxy
-* a copy of Zulip's `vagrant` provisioning logs, available in
+- host operating system
+- installation method (Vagrant or direct)
+- whether or not you are using a proxy
+- a copy of Zulip's `vagrant` provisioning logs, available in
   `/var/log/provision.log` on your virtual machine
 
 ### Requirements
@@ -65,7 +66,7 @@ to GitHub working on your machine.
 
 Follow our [Git guide][set-up-git] in order to install Git, set up a
 GitHub account, create an SSH key to access code on GitHub
-efficiently, etc.  Be sure to create an SSH key and add it to your
+efficiently, etc. Be sure to create an SSH key and add it to your
 GitHub account using
 [these instructions](https://help.github.com/en/articles/generating-an-ssh-key).
 
@@ -73,10 +74,10 @@ GitHub account using
 
 Jump to:
 
-* [macOS](#macos)
-* [Ubuntu](#ubuntu)
-* [Debian](#debian)
-* [Windows](#windows-10)
+- [macOS](#macos)
+- [Ubuntu](#ubuntu)
+- [Debian](#debian)
+- [Windows](#windows-10)
 
 #### macOS
 
@@ -94,14 +95,14 @@ Now you are ready for [Step 2: Get Zulip code](#step-2-get-zulip-code).
 
 ##### 1. Install Vagrant, Docker, and Git
 
-```
+```console
 christie@ubuntu-desktop:~
 $ sudo apt install vagrant docker.io git
 ```
 
 ##### 2. Add yourself to the `docker` group:
 
-```
+```console
 christie@ubuntu-desktop:~
 $ sudo adduser $USER docker
 Adding user `christie' to group `docker' ...
@@ -109,10 +110,10 @@ Adding user christie to group docker
 Done.
 ```
 
-You will need to reboot for this change to take effect.  If it worked,
+You will need to reboot for this change to take effect. If it worked,
 you will see `docker` in your list of groups:
 
-```
+```console
 christie@ubuntu-desktop:~
 $ groups | grep docker
 christie adm cdrom sudo dip plugdev lpadmin sambashare docker
@@ -124,9 +125,9 @@ If you had previously installed and removed an older version of
 Docker, an [Ubuntu
 bug](https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1844894)
 may prevent Docker from being automatically enabled and started after
-installation.  You can check using the following:
+installation. You can check using the following:
 
-```
+```console
 $ systemctl status docker
 ● docker.service - Docker Application Container Engine
    Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
@@ -137,7 +138,7 @@ If the service is not running, you'll see `Active: inactive (dead)` on
 the second line, and will need to enable and start the Docker service
 using the following:
 
-```
+```bash
 sudo systemctl unmask docker
 sudo systemctl enable docker
 sudo systemctl start docker
@@ -154,16 +155,15 @@ Debian](https://docs.docker.com/install/linux/docker-ce/debian/).
 
 #### Windows 10
 
-```eval_rst
-.. note::
-    We recommend using `WSL 2 for Windows development <../development/setup-advanced.html#installing-directly-on-windows-10-with-wsl-2>`_.
-```
+:::{note}
+We recommend using [WSL 2 for Windows development](../development/setup-advanced.html#installing-directly-on-windows-10-with-wsl-2).
+:::
 
-1. Install [Git for Windows][git-bash], which installs *Git BASH*.
+1. Install [Git for Windows][git-bash], which installs _Git BASH_.
 2. Install [VirtualBox][vbox-dl] (latest).
 3. Install [Vagrant][vagrant-dl] (latest).
 
-(Note: While *Git BASH* is recommended, you may also use [Cygwin][cygwin-dl].
+(Note: While _Git BASH_ is recommended, you may also use [Cygwin][cygwin-dl].
 If you do, make sure to **install default required packages** along with
 **git**, **curl**, **openssh**, and **rsync** binaries.)
 
@@ -189,13 +189,13 @@ In **Git for BASH**:
 
 Open **Git BASH as an administrator** and run:
 
-```
+```console
 $ git config --global core.symlinks true
 ```
 
 Now confirm the setting:
 
-```
+```console
 $ git config core.symlinks
 true
 ```
@@ -210,7 +210,7 @@ In **Cygwin**:
 
 Open a Cygwin window **as an administrator** and do this:
 
-```
+```console
 christie@win10 ~
 $ echo 'export "CYGWIN=$CYGWIN winsymlinks:native"' >> ~/.bash_profile
 ```
@@ -218,7 +218,7 @@ $ echo 'export "CYGWIN=$CYGWIN winsymlinks:native"' >> ~/.bash_profile
 Next, close that Cygwin window and open another. If you `echo` $CYGWIN you
 should see:
 
-```
+```console
 christie@win10 ~
 $ echo $CYGWIN
 winsymlinks:native
@@ -229,7 +229,7 @@ Now you are ready for [Step 2: Get Zulip code](#step-2-get-zulip-code).
 (Note: The **GitHub Desktop client** for Windows has a bug where it
 will automatically set `git config core.symlink false` on a repository
 if you use it to clone a repository, which will break the Zulip
-development environment, because we use symbolic links.  For that
+development environment, because we use symbolic links. For that
 reason, we recommend avoiding using GitHub Desktop client to clone
 projects and to instead follow these instructions exactly.)
 
@@ -244,7 +244,7 @@ projects and to instead follow these instructions exactly.)
    [clone your fork of the Zulip repository](../git/cloning.html#step-1b-clone-to-your-machine) and
    [connect the Zulip upstream repository](../git/cloning.html#step-1c-connect-your-fork-to-zulip-upstream):
 
-```
+```bash
 git clone --config pull.rebase git@github.com:YOURUSERNAME/zulip.git
 cd zulip
 git remote add -f upstream https://github.com/zulip/zulip.git
@@ -255,7 +255,7 @@ This will create a 'zulip' directory and download the Zulip code into it.
 Don't forget to replace YOURUSERNAME with your Git username. You will see
 something like:
 
-```
+```console
 christie@win10 ~
 $ git clone --config pull.rebase git@github.com:YOURUSERNAME/zulip.git
 Cloning into 'zulip'...
@@ -276,7 +276,7 @@ environment](#step-3-start-the-development-environment).
 Change into the zulip directory and tell vagrant to start the Zulip
 development environment with `vagrant up`:
 
-```
+```bash
 # On Windows or macOS:
 cd zulip
 vagrant plugin install vagrant-vbguest
@@ -298,56 +298,57 @@ does the following:
 - runs the `tools/provision` script inside the virtual machine/container, which
   downloads all required dependencies, sets up the python environment for
   the Zulip development server, and initializes a default test
-  database.  We call this process "provisioning", and it is documented
+  database. We call this process "provisioning", and it is documented
   in some detail in our [dependencies documentation](../subsystems/dependencies.md).
 
 You will need an active internet connection during the entire
 process. (See [Specifying a proxy](#specifying-a-proxy) if you need a
 proxy to access the internet.) `vagrant up` can fail while
-provisioning if your Internet connection is unreliable.  To retry, you
+provisioning if your Internet connection is unreliable. To retry, you
 can use `vagrant provision` (`vagrant up` will just boot the guest
-without provisioning after the first time).  Other common issues are
+without provisioning after the first time). Other common issues are
 documented in the
 [Troubleshooting and common errors](#troubleshooting-and-common-errors)
-section.  If that doesn't help, please visit
+section. If that doesn't help, please visit
 [#provision help](https://chat.zulip.org/#narrow/stream/21-provision-help)
 in the [Zulip development community server](../contributing/chat-zulip-org.md) for
 real-time help.
 
-On Windows, you will see the message `The system cannot find the path
-specified.` several times.  This is normal and is not a problem.
+On Windows, you will see the message
+`The system cannot find the path specified.` several times. This is
+normal and is not a problem.
 
 Once `vagrant up` has completed, connect to the development
 environment with `vagrant ssh`:
 
-```
+```console
 christie@win10 ~/zulip
 $ vagrant ssh
 ```
 
 You should see output that starts like this:
 
-```
+```console
 Welcome to Ubuntu 18.04.2 LTS (GNU/Linux 4.15.0-54-generic x86_64)
 ```
 
 Congrats, you're now inside the Zulip development environment!
 
 You can confirm this by looking at the command prompt, which starts
-with `(zulip-py3-venv)vagrant@`.  If it just starts with `vagrant@`, your
+with `(zulip-py3-venv)vagrant@`. If it just starts with `vagrant@`, your
 provisioning failed and you should look at the
 [troubleshooting section](#troubleshooting-and-common-errors).
 
 Next, start the Zulip server:
 
-```
+```console
 (zulip-py3-venv) vagrant@ubuntu-bionic:/srv/zulip
 $ ./tools/run-dev.py
 ```
 
 You will see several lines of output starting with something like:
 
-```
+```console
 2016-05-04 22:20:33,895 INFO: process_fts_updates starting
 Recompiling templates
 2016-05-04 18:20:34,804 INFO: Not in recovery; listening for FTS updates
@@ -362,9 +363,10 @@ Quit the server with CTRL-C.
 2016-05-04 18:20:40,722 INFO     Tornado  95.5% busy over the past  0.0 seconds
 Performing system checks...
 ```
+
 And ending with something similar to:
 
-```
+```console
 http://localhost:9994/webpack-dev-server/
 webpack result is served from http://localhost:9991/webpack/
 content is served from /srv/zulip
@@ -385,7 +387,7 @@ The Zulip server will continue to run and send output to the terminal window.
 When you navigate to Zulip in your browser, check your terminal and you
 should see something like:
 
-```
+```console
 2016-05-04 18:21:57,547 INFO     127.0.0.1       GET     302 582ms (+start: 417ms) / (unauth@zulip via ?)
 [04/May/2016 18:21:57]"GET / HTTP/1.0" 302 0
 2016-05-04 18:21:57,568 INFO     127.0.0.1       GET     301   4ms /login (unauth@zulip via ?)
@@ -409,7 +411,7 @@ development environment on the virtual machine/container.
 Each component of the Zulip development server will automatically
 restart itself or reload data appropriately when you make changes. So,
 to see your changes, all you usually have to do is reload your
-browser.  More details on how this works are available below.
+browser. More details on how this works are available below.
 
 Zulip's whitespace rules are all enforced by linters, so be sure to
 run `tools/lint` often to make sure you're following our coding style
@@ -438,10 +440,10 @@ guide][rtd-git-guide].
 
 If after rebasing onto a new version of the Zulip server, you receive
 new errors while starting the Zulip server or running tests, this is
-probably not because Zulip's master branch is broken.  Instead, this
+probably not because Zulip's `main` branch is broken. Instead, this
 is likely because we've recently merged changes to the development
 environment provisioning process that you need to apply to your
-development environment.  To update your environment, you'll need to
+development environment. To update your environment, you'll need to
 re-provision your vagrant machine using `vagrant provision` (this just
 runs `tools/provision` from your Zulip checkout inside the Vagrant
 guest); this should complete in about a minute.
@@ -460,16 +462,16 @@ help.
 If you ever want to recreate your development environment again from
 scratch (e.g. to test a change you've made to the provisioning
 process, or because you think something is broken), you can do so
-using `vagrant destroy` and then `vagrant up`.  This will usually be
+using `vagrant destroy` and then `vagrant up`. This will usually be
 much faster than the original `vagrant up` since the base image is
 already cached on your machine (it takes about 5 minutes to run with a
 fast Internet connection).
 
 Any additional programs (e.g. Zsh, emacs, etc.) or configuration that
 you may have installed in the development environment will be lost
-when you recreate it.  To address this, you can create a script called
+when you recreate it. To address this, you can create a script called
 `tools/custom_provision` in your Zulip Git checkout; and place any
-extra setup commands there.  Vagrant will run `tools/custom_provision`
+extra setup commands there. Vagrant will run `tools/custom_provision`
 every time you run `vagrant provision` (or create a Vagrant guest via
 `vagrant up`).
 
@@ -484,7 +486,7 @@ can halt vagrant from another Terminal/Git BASH window.
 
 From the window where run-dev.py is running:
 
-```
+```console
 2016-05-04 18:33:13,330 INFO     127.0.0.1       GET     200  92ms /register/ (unauth@zulip via ?)
 ^C
 KeyboardInterrupt
@@ -493,9 +495,10 @@ logout
 Connection to 127.0.0.1 closed.
 christie@win10 ~/zulip
 ```
+
 Now you can suspend the development environment:
 
-```
+```console
 christie@win10 ~/zulip
 $ vagrant suspend
 ==> default: Saving VM state and suspending execution...
@@ -503,7 +506,7 @@ $ vagrant suspend
 
 If `vagrant suspend` doesn't work, try `vagrant halt`:
 
-```
+```console
 christie@win10 ~/zulip
 $ vagrant halt
 ==> default: Attempting graceful shutdown of VM...
@@ -520,7 +523,7 @@ pass the `--provider` option required above). You will also need to
 connect to the virtual machine with `vagrant ssh` and re-start the
 Zulip server:
 
-```
+```console
 christie@win10 ~/zulip
 $ vagrant up
 $ vagrant ssh
@@ -533,15 +536,15 @@ $ ./tools/run-dev.py
 
 Next, read the following to learn more about developing for Zulip:
 
-* [Git & GitHub guide][rtd-git-guide]
-* [Using the development environment][rtd-using-dev-env]
-* [Testing][rtd-testing] (and [Configuring CI][ci] to
-run the full test suite against any branches you push to your fork,
-which can help you optimize your development workflow).
+- [Git & GitHub guide][rtd-git-guide]
+- [Using the development environment][rtd-using-dev-env]
+- [Testing][rtd-testing] (and [Configuring CI][ci] to
+  run the full test suite against any branches you push to your fork,
+  which can help you optimize your development workflow).
 
 ### Troubleshooting and common errors
 
-Below you'll find a list of common errors and their solutions.  Most
+Below you'll find a list of common errors and their solutions. Most
 issues are resolved by just provisioning again (by running
 `./tools/provision` (from `/srv/zulip`) inside the Vagrant guest or
 equivalently `vagrant provision` from outside).
@@ -549,17 +552,17 @@ equivalently `vagrant provision` from outside).
 If these solutions aren't working for you or you encounter an issue not
 documented below, there are a few ways to get further help:
 
-* Ask in [#provision help](https://chat.zulip.org/#narrow/stream/21-provision-help)
+- Ask in [#provision help](https://chat.zulip.org/#narrow/stream/21-provision-help)
   in the [Zulip development community server](../contributing/chat-zulip-org.md).
-* [File an issue](https://github.com/zulip/zulip/issues).
+- [File an issue](https://github.com/zulip/zulip/issues).
 
 When reporting your issue, please include the following information:
 
-* host operating system
-* installation method (Vagrant or direct)
-* whether or not you are using a proxy
-* a copy of Zulip's `vagrant` provisioning logs, available in
-  `/var/log/provision.log` on your virtual machine.  If you choose to
+- host operating system
+- installation method (Vagrant or direct)
+- whether or not you are using a proxy
+- a copy of Zulip's `vagrant` provisioning logs, available in
+  `/var/log/provision.log` on your virtual machine. If you choose to
   post just the error output, please include the **beginning of the
   error output**, not just the last few lines.
 
@@ -568,11 +571,11 @@ usually helpful.
 
 #### Vagrant guest doesn't show (zulip-py3-venv) at start of prompt
 
-This is caused by provisioning failing to complete successfully.  You
+This is caused by provisioning failing to complete successfully. You
 can see the errors in `var/log/provision.log`; it should end with
 something like this:
 
-```
+```text
 ESC[94mZulip development environment setup succeeded!ESC[0m
 ```
 
@@ -589,7 +592,8 @@ shell and run `vagrant ssh` again to get the virtualenv setup properly.
 #### Vagrant was unable to mount VirtualBox shared folders
 
 For the following error:
-```
+
+```console
 Vagrant was unable to mount VirtualBox shared folders. This is usually
 because the filesystem "vboxsf" is not available. This filesystem is
 made available via the VirtualBox Guest Additions and kernel
@@ -603,19 +607,19 @@ was:
 
 If this error starts happening unexpectedly, then just run:
 
-```
+```bash
 vagrant halt
 vagrant up
 ```
 
-to reboot the guest.  After this, you can do `vagrant provision` and
+to reboot the guest. After this, you can do `vagrant provision` and
 `vagrant ssh`.
 
 #### ssl read error
 
 If you receive the following error while running `vagrant up`:
 
-```
+```console
 SSL read: error:00000000:lib(0):func(0):reason(0), errno 104
 ```
 
@@ -627,14 +631,14 @@ better network connection).
 
 When running `vagrant up` or `provision`, if you see the following error:
 
-```
+```console
 ==> default: E:unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
 ```
 
 It means that your local apt repository has been corrupted, which can
 usually be resolved by executing the command:
 
-```
+```bash
 apt-get -f install
 ```
 
@@ -642,12 +646,12 @@ apt-get -f install
 
 On running `vagrant ssh`, if you see the following error:
 
-```
+```console
 ssh_exchange_identification: Connection closed by remote host
 ```
 
 It usually means the Vagrant guest is not running, which is usually
-solved by rebooting the Vagrant guest via `vagrant halt; vagrant up`.  See
+solved by rebooting the Vagrant guest via `vagrant halt; vagrant up`. See
 [Vagrant was unable to communicate with the guest machine](#vagrant-was-unable-to-communicate-with-the-guest-machine)
 for more details.
 
@@ -655,7 +659,7 @@ for more details.
 
 If you receive the following error while running `vagrant up`:
 
-```
+```console
 ==> default: Traceback (most recent call last):
 ==> default: File "./emoji_dump.py", line 75, in <module>
 ==> default:
@@ -669,9 +673,9 @@ Then Vagrant was not able to create a symbolic link.
 
 First, if you are using Windows, **make sure you have run Git BASH (or
 Cygwin) as an administrator**. By default, only administrators can
-create symbolic links on Windows.  Additionally [UAC][windows-uac], a
+create symbolic links on Windows. Additionally [UAC][windows-uac], a
 Windows feature intended to limit the impact of malware, can prevent
-even administrator accounts from creating symlinks.  [Turning off
+even administrator accounts from creating symlinks. [Turning off
 UAC][disable-uac] will allow you to create symlinks. You can also try
 some of the solutions mentioned
 [here](https://superuser.com/questions/124679/how-do-i-create-a-link-in-windows-7-home-premium-as-a-regular-user).
@@ -681,7 +685,7 @@ some of the solutions mentioned
 
 If you ran Git BASH as administrator but you already had VirtualBox
 running, you might still get this error because VirtualBox is not
-running as administrator.  In that case: close the Zulip VM with
+running as administrator. In that case: close the Zulip VM with
 `vagrant halt`; close any other VirtualBox VMs that may be running;
 exit VirtualBox; and try again with `vagrant up --provision` from a
 Git BASH running as administrator.
@@ -697,7 +701,7 @@ Get the name of your virtual machine by running `vboxmanage list vms` and
 then print out the custom settings for this virtual machine with
 `vboxmanage getextradata YOURVMNAME enumerate`:
 
-```
+```console
 christie@win10 ~/zulip
 $ vboxmanage list vms
 "zulip_default_1462498139595_55484" {5a65199d-8afa-4265-b2f6-6b1f162f157d}
@@ -716,7 +720,7 @@ If `vboxmanage enumerate` prints nothing, or shows a value of 0 for
 VBoxInternal2/SharedFoldersEnableSymlinksCreate/srv_zulip, then enable
 symbolic links by running this command in Terminal/Git BASH/Cygwin:
 
-```
+```bash
 vboxmanage setextradata YOURVMNAME VBoxInternal2/SharedFoldersEnableSymlinksCreate/srv_zulip 1
 ```
 
@@ -727,10 +731,10 @@ The virtual machine needs to be shut down when you run this command.
 If you get an error message on Windows about lack of Windows Home
 support for Hyper-V when running `vagrant up`, the problem is that
 Windows is incorrectly attempting to use Hyper-V rather than
-Virtualbox as the virtualization provider.  You can fix this by
+Virtualbox as the virtualization provider. You can fix this by
 explicitly passing the virtualbox provider to `vagrant up`:
 
-```
+```console
 christie@win10 ~/zulip
 $ vagrant up --provide=virtualbox
 ```
@@ -739,15 +743,15 @@ $ vagrant up --provide=virtualbox
 
 If you see the following error after running `vagrant up`:
 
-```
+```console
 default: SSH address: 127.0.0.1:2222
 default: SSH username: vagrant
 default: SSH auth method: private key
 default: Error: Connection timeout. Retrying...
 default: Error: Connection timeout. Retrying...
 default: Error: Connection timeout. Retrying...
-
 ```
+
 A likely cause is that hardware virtualization is not enabled for your
 computer. This must be done via your computer's BIOS settings. Look for a
 setting called VT-x (Intel) or (AMD-V).
@@ -762,7 +766,7 @@ this post](https://stackoverflow.com/questions/22575261/vagrant-stuck-connection
 
 If you see the following error when you run `vagrant up`:
 
-```
+```console
 Timed out while waiting for the machine to boot. This means that
 Vagrant was unable to communicate with the guest machine within
 the configured ("config.vm.boot_timeout" value) time period.
@@ -782,26 +786,26 @@ the timeout ("config.vm.boot_timeout") value.
 ```
 
 This has a range of possible causes, that usually amount to a bug in
-Virtualbox or Vagrant.  If you see this error, you usually can fix it
+Virtualbox or Vagrant. If you see this error, you usually can fix it
 by rebooting the guest via `vagrant halt; vagrant up`.
 
 #### Vagrant up fails with subprocess.CalledProcessError
 
 The `vagrant up` command basically does the following:
 
-* Downloads an Ubuntu image and starts it using a Vagrant provider.
-* Uses `vagrant ssh` to connect to that Ubuntu guest, and then runs
+- Downloads an Ubuntu image and starts it using a Vagrant provider.
+- Uses `vagrant ssh` to connect to that Ubuntu guest, and then runs
   `tools/provision`, which has a lot of subcommands that are
-  executed via Python's `subprocess` module.  These errors mean that
+  executed via Python's `subprocess` module. These errors mean that
   one of those subcommands failed.
 
 To debug such errors, you can log in to the Vagrant guest machine by
 running `vagrant ssh`, which should present you with a standard shell
-prompt.  You can debug interactively by using e.g. `cd zulip &&
-./tools/provision`, and then running the individual subcommands
-that failed.  Once you've resolved the problem, you can rerun
-`tools/provision` to proceed; the provisioning system is designed
-to recover well from failures.
+prompt. You can debug interactively by using e.g.
+`cd zulip && ./tools/provision`, and then running the individual
+subcommands that failed. Once you've resolved the problem, you can
+rerun `tools/provision` to proceed; the provisioning system is
+designed to recover well from failures.
 
 The Zulip provisioning system is generally highly reliable; the most common
 cause of issues here is a poor network connection (or one where you need a
@@ -809,18 +813,19 @@ proxy to access the Internet and haven't [configured the development
 environment to use it](#specifying-a-proxy).
 
 Once you've provisioned successfully, you'll get output like this:
-```
+
+```console
 Zulip development environment setup succeeded!
 (zulip-py3-venv) vagrant@vagrant-base-trusty-amd64:~/zulip$
 ```
 
 If the `(zulip-py3-venv)` part is missing, this is because your
 installation failed the first time before the Zulip virtualenv was
-created.  You can fix this by just closing the shell and running
+created. You can fix this by just closing the shell and running
 `vagrant ssh` again, or using `source /srv/zulip-py3-venv/bin/activate`.
 
 Finally, if you encounter any issues that weren't caused by your
-Internet connection, please report them!  We try hard to keep Zulip
+Internet connection, please report them! We try hard to keep Zulip
 development environment provisioning free of bugs.
 
 ##### `pip install` fails during `vagrant up` on Ubuntu
@@ -829,14 +834,14 @@ Likely causes are:
 
 1. Networking issues
 2. Insufficient RAM. Check whether you've allotted at least two
-gigabytes of RAM, which is the minimum Zulip
-[requires](../development/setup-vagrant.html#requirements). If
-not, go to your VM settings and increase the RAM, then restart
-the VM.
+   gigabytes of RAM, which is the minimum Zulip
+   [requires](../development/setup-vagrant.html#requirements). If
+   not, go to your VM settings and increase the RAM, then restart
+   the VM.
 
 ##### yarn install warnings
 
-```
+```console
 $ yarn install
 yarn install v0.24.5
 [1/4] Resolving packages...
@@ -853,7 +858,7 @@ It is okay to proceed and start the Zulip server.
 
 #### VBoxManage errors related to VT-x or WHvSetupPartition
 
-```
+```console
 There was an error while executing `VBoxManage`, a CLI used by Vagrant
 for controlling VirtualBox. The command and stderr is shown below.
 
@@ -866,7 +871,7 @@ VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap,
 
 or
 
-```
+```console
 Stderr: VBoxManage.exe: error: Call to WHvSetupPartition failed: ERROR_SUCCESS (Last=0xc000000d/87) (VERR_NEM_VM_CREATE_FAILED)
 VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole
 ```
@@ -875,14 +880,15 @@ First, ensure that hardware virtualization support (VT-x or AMD-V) is
 enabled in your BIOS.
 
 If the error persists, you may have run into an incompatibility
-between VirtualBox and Hyper-V on Windows.  To disable Hyper-V, open
-command prompt as administrator, run `bcdedit /set
-hypervisorlaunchtype off`, and reboot.  If you need to enable it
-later, run `bcdedit /deletevalue hypervisorlaunchtype`, and reboot.
+between VirtualBox and Hyper-V on Windows. To disable Hyper-V, open
+command prompt as administrator, run
+`bcdedit /set hypervisorlaunchtype off`, and reboot. If you need to
+enable it later, run `bcdedit /deletevalue hypervisorlaunchtype`, and
+reboot.
 
 #### OSError: [Errno 26] Text file busy
 
-```
+```console
 default: Traceback (most recent call last):
 …
 default:   File "/srv/zulip-py3-venv/lib/python3.6/shutil.py", line 426, in _rmtree_safe_fd
@@ -892,26 +898,26 @@ default: OSError: [Errno 26] Text file busy: 'baremetrics'
 
 This error is caused by a
 [bug](https://www.virtualbox.org/ticket/19004) in recent versions of
-the VirtualBox Guest Additions for Linux on Windows hosts.  You can
+the VirtualBox Guest Additions for Linux on Windows hosts. You can
 check the running version of VirtualBox Guest Additions with this
 command:
 
-```
+```bash
 vagrant ssh -- 'modinfo -F version vboxsf'
 ```
 
 The bug has not been fixed upstream as of this writing, but you may be
 able to work around it by downgrading VirtualBox Guest Additions to
-6.0.4.  To do this, create a `~/.zulip-vagrant-config` file and add
+6.0.4. To do this, create a `~/.zulip-vagrant-config` file and add
 this line:
 
-```
+```text
 VBOXADD_VERSION 6.0.4
 ```
 
 Then run these commands (yes, reload is needed twice):
 
-```
+```bash
 vagrant plugin install vagrant-vbguest
 vagrant reload
 vagrant reload --provision
@@ -920,14 +926,14 @@ vagrant reload --provision
 ### Specifying an Ubuntu mirror
 
 Bringing up a development environment for the first time involves
-downloading many packages from the Ubuntu archive.  The Ubuntu cloud
+downloading many packages from the Ubuntu archive. The Ubuntu cloud
 images use the global mirror `http://archive.ubuntu.com/ubuntu/` by
 default, but you may find that you can speed up the download by using
-a local mirror closer to your location.  To do this, create
+a local mirror closer to your location. To do this, create
 `~/.zulip-vagrant-config` and add a line like this, replacing the URL
 as appropriate:
 
-```
+```text
 UBUNTU_MIRROR http://us.archive.ubuntu.com/ubuntu/
 ```
 
@@ -937,14 +943,14 @@ If you need to use a proxy server to access the Internet, you will
 need to specify the proxy settings before running `Vagrant up`.
 First, install the Vagrant plugin `vagrant-proxyconf`:
 
-```
+```bash
 vagrant plugin install vagrant-proxyconf
 ```
 
 Then create `~/.zulip-vagrant-config` and add the following lines to
 it (with the appropriate values in it for your proxy):
 
-```
+```text
 HTTP_PROXY http://proxy_host:port
 HTTPS_PROXY http://proxy_host:port
 NO_PROXY localhost,127.0.0.1,.example.com,.zulipdev.com
@@ -953,14 +959,14 @@ NO_PROXY localhost,127.0.0.1,.example.com,.zulipdev.com
 For proxies that require authentication, the config will be a bit more
 complex, e.g.:
 
-```
+```text
 HTTP_PROXY http://userName:userPassword@192.168.1.1:8080
 HTTPS_PROXY http://userName:userPassword@192.168.1.1:8080
 NO_PROXY localhost,127.0.0.1,.example.com,.zulipdev.com
 ```
 
 You'll want to **double-check** your work for mistakes (a common one
-is using `https://` when your proxy expects `http://`).  Invalid proxy
+is using `https://` when your proxy expects `http://`). Invalid proxy
 configuration can cause confusing/weird exceptions; if you're using a
 proxy and get an error, the first thing you should investigate is
 whether you entered your proxy configuration correctly.
@@ -976,9 +982,9 @@ then do a `vagrant reload`.
 ### Using a different port for Vagrant
 
 You can also change the port on the host machine that Vagrant uses by
-adding to your `~/.zulip-vagrant-config` file.  E.g. if you set:
+adding to your `~/.zulip-vagrant-config` file. E.g. if you set:
 
-```
+```text
 HOST_PORT 9971
 ```
 
@@ -989,7 +995,7 @@ If you'd like to be able to connect to your development environment from other
 machines than the VM host, you can manually set the host IP address in the
 '~/.zulip-vagrant-config' file as well. For example, if you set:
 
-```
+```text
 HOST_IP_ADDR 0.0.0.0
 ```
 
@@ -1007,7 +1013,7 @@ described here are ignored).
 
 Our default Vagrant settings allocate 2 cpus with 2GiB of memory for
 the guest, which is sufficient to run everything in the development
-environment.  If your host system has more CPUs, or you have enough
+environment. If your host system has more CPUs, or you have enough
 RAM that you'd like to allocate more than 2GiB to the guest, you can
 improve performance of the Zulip development environment by allocating
 more resources.
@@ -1015,14 +1021,14 @@ more resources.
 To do so, create a `~/.zulip-vagrant-config` file containing the
 following lines:
 
-```
+```text
 GUEST_CPUS <number of cpus>
 GUEST_MEMORY_MB <system memory (in MB)>
 ```
 
 For example:
 
-```
+```text
 GUEST_CPUS 4
 GUEST_MEMORY_MB 8192
 ```

docs/development/test-install.md

@@ -1,23 +1,24 @@
 # Testing the installer
 
 Zulip's install process is tested as part of [its continuous
-integrations suite][CI], but that only tests the most common
+integrations suite][ci], but that only tests the most common
 configurations; when making changes to more complicated [installation
 options][installer-docs], Zulip provides tooling to repeatedly test
 the installation process in a clean environment each time.
 
-[CI]: https://github.com/zulip/zulip/actions/workflows/production-suite.yml?query=branch%3Amaster
+[ci]: https://github.com/zulip/zulip/actions/workflows/production-suite.yml?query=branch%3Amain
 [installer-docs]: ../production/install.md
 
 ## Configuring
 
 Using the test installer framework requires a Linux operating system;
-it will not work on WSL, for instance.  It requires at least 3G of
+it will not work on WSL, for instance. It requires at least 3G of
 RAM, in order to accommodate the VMs and the steps which build the
 release assets.
 
 To begin, install the LXC toolchain:
-```
+
+```bash
 sudo apt-get install lxc lxc-utils
 ```
 
@@ -32,7 +33,8 @@ You only need to do this step once per time you work on a set of
 changes, to refresh the package that the installer uses. The installer
 doesn't work cleanly out of a source checkout; it wants a release
 checkout, so we build a tarball of one of those first:
-```
+
+```bash
 ./tools/build-release-tarball test-installer
 ```
 
@@ -43,10 +45,11 @@ as the last step; for example,
 Next, unpack that file into a local directory; we will make any
 changes we want in our source checkout and copy them into this
 directory. The test installer needs the release directory to be named
-`zulip-server`, so we rename it and move it appropriately.  In the
+`zulip-server`, so we rename it and move it appropriately. In the
 first line, you'll need to substitute the actual path that you got for
 the tarball, above:
-```
+
+```bash
 tar xzf /tmp/tmp.fepqqNBWxp/zulip-server-test-installer.tar.gz
 mkdir zulip-test-installer
 mv zulip-server-test-installer zulip-test-installer/zulip-server
@@ -65,7 +68,8 @@ into the installer.
 
 For example, to test an install onto Ubuntu 20.04 "Focal", we might
 call:
-```
+
+```bash
 sudo ./tools/test-install/install \
   -r focal \
   ./zulip-test-installer/ \
@@ -82,7 +86,8 @@ take a while.
 Regardless of if the install succeeds or fails, it will stay running
 so you can inspect it. You can see all of the containers which are
 running, and their randomly-generated names, by running:
-```
+
+```bash
 sudo lxc-ls -f
 ```
 
@@ -90,7 +95,8 @@ sudo lxc-ls -f
 
 After using `lxc-ls` to list containers, you can choose one of them
 and connect to its terminal:
-```
+
+```bash
 sudo lxc-attach --clear-env -n zulip-install-focal-PUvff
 ```
 
@@ -98,24 +104,25 @@ sudo lxc-attach --clear-env -n zulip-install-focal-PUvff
 
 To destroy all containers (but leave the base containers, which speed
 up the initial install):
-```
+
+```bash
 sudo ./tools/test-install/destroy-all -f
 ```
 
 To destroy just one container:
-```
+
+```bash
 sudo lxc-destroy -f -n zulip-install-focal-PUvff
 ```
 
-
-
 ### Iterating on the installer
 
 Iterate on the installer by making changes to your source tree,
 copying them into the release directory, and re-running the installer,
 which will start up a new container. Here, we update just the
 `scripts` and `puppet` directories of the release directory:
-```
+
+```bash
 rsync -az scripts puppet zulip-test-installer/zulip-server/
 
 sudo ./tools/test-install/install \
@@ -124,4 +131,3 @@ sudo ./tools/test-install/install \
  --hostname=zulip.example.net \
  --email=username@example.net
 ```
-

docs/development/using.md

@@ -1,10 +1,9 @@
-Using the development environment
-=================================
+# Using the development environment
 
 This page describes the basic edit/refresh workflows for working with
-the Zulip development environment.  Generally, the development
+the Zulip development environment. Generally, the development
 environment will automatically update as soon as you save changes
-using your editor.  Details for work on the [server](#server),
+using your editor. Details for work on the [server](#server),
 [webapp](#web), and [mobile apps](#mobile) are below.
 
 If you're working on authentication methods or need to use the [Zulip
@@ -13,79 +12,80 @@ the development environment][authentication-dev-server].
 
 ## Common
 
-* Zulip's master branch moves quickly, and you should rebase
-  constantly with e.g. `git fetch upstream; git rebase
-  upstream/master` to avoid developing on an old version of the Zulip
-  codebase (leading to unnecessary merge conflicts).
-* Remember to run `tools/provision` to update your development
+- Zulip's `main` branch moves quickly, and you should rebase
+  constantly with e.g.
+  `git fetch upstream; git rebase upstream/main` to avoid developing
+  on an old version of the Zulip codebase (leading to unnecessary
+  merge conflicts).
+- Remember to run `tools/provision` to update your development
   environment after switching branches; it will run in under a second
   if no changes are required.
-* After making changes, you'll often want to run the
+- After making changes, you'll often want to run the
   [linters](../testing/linters.md) and relevant [test
-  suites](../testing/testing.md).  Consider using our [Git pre-commit
+  suites](../testing/testing.md). Consider using our [Git pre-commit
   hook](../git/zulip-tools.html#set-up-git-repo-script) to
   automatically lint whenever you make a commit.
-* All of our test suites are designed to support quickly testing just
+- All of our test suites are designed to support quickly testing just
   a single file or test case, which you should take advantage of to
   save time.
-* Many useful development tools, including tools for rebuilding the
+- Many useful development tools, including tools for rebuilding the
   database with different test data, are documented in-app at
   `https://localhost:9991/devtools`.
-* If you want to restore your development environment's database to a
+- If you want to restore your development environment's database to a
   pristine state, you can use `./tools/rebuild-dev-database`.
 
 ## Server
 
-* For changes that don't affect the database model, the Zulip
+- For changes that don't affect the database model, the Zulip
   development environment will automatically detect changes and
   restart:
-    * The main Django/Tornado server processes are run on top of
+  - The main Django/Tornado server processes are run on top of
     Django's [manage.py runserver][django-runserver], which will
     automatically restart them when you save changes to Python code
-    they use.  You can watch this happen in the `run-dev.py` console
+    they use. You can watch this happen in the `run-dev.py` console
     to make sure the backend has reloaded.
-   * The Python queue workers will also automatically restart when you
+  - The Python queue workers will also automatically restart when you
     save changes, as long as they haven't crashed (which can happen if
     they reloaded into a version with a syntax error).
-* If you change the database schema (`zerver/models.py`), you'll need
+- If you change the database schema (`zerver/models.py`), you'll need
   to use the [Django migrations
   process](../subsystems/schema-migrations.md); see also the [new
   feature tutorial][new-feature-tutorial] for an example.
-* While testing server changes, it's helpful to watch the `run-dev.py`
+- While testing server changes, it's helpful to watch the `run-dev.py`
   console output, which will show tracebacks for any 500 errors your
   Zulip development server encounters (which are probably caused by
   bugs in your code).
-* To manually query Zulip's database interactively, use `./manage.py
-  shell` or `manage.py dbshell`.
-* The database(s) used for the automated tests are independent from
+- To manually query Zulip's database interactively, use
+  `./manage.py shell` or `manage.py dbshell`.
+- The database(s) used for the automated tests are independent from
   the one you use for manual testing in the UI, so changes you make to
   the database manually will never affect the automated tests.
 
 ## Web
 
-* Once the development server (`run-dev.py`) is running, you can visit
+- Once the development server (`run-dev.py`) is running, you can visit
   <http://localhost:9991/> in your browser.
-* By default, the development server homepage just shows a list of the
+- By default, the development server homepage just shows a list of the
   users that exist on the server and you can log in as any of them by
   just clicking on a user.
-    * This setup saves time for the common case where you want to test
+  - This setup saves time for the common case where you want to test
     something other than the login process.
-    * You can test the login or registration process by clicking the
+  - You can test the login or registration process by clicking the
     links for the normal login page.
-* Most changes will take effect automatically.  Details:
-  * If you change CSS files, your changes will appear immediately via
+- Most changes will take effect automatically. Details:
+  - If you change CSS files, your changes will appear immediately via
     webpack hot module replacement.
-  * If you change JavaScript code (`static/js`) or Handlebars
+  - If you change JavaScript code (`static/js`) or Handlebars
     templates (`static/templates`), the browser window will be
     reloaded automatically.
-  * For Jinja2 backend templates (`templates/*`), you'll need to reload
+  - For Jinja2 backend templates (`templates/*`), you'll need to reload
     the browser window to see your changes.
-* Any JavaScript exceptions encountered while using the webapp in a
+- Any JavaScript exceptions encountered while using the webapp in a
   development environment will be displayed as a large notice, so you
   don't need to watch the JavaScript console for exceptions.
-* Both Chrome and Firefox have great debuggers, inspectors, and
+- Both Chrome and Firefox have great debuggers, inspectors, and
   profilers in their built-in developer tools.
-* `debug.js` has some occasionally useful JavaScript profiling code.
+- `debug.js` has some occasionally useful JavaScript profiling code.
 
 ## Mobile
 

docs/documentation/api.md

@@ -4,7 +4,7 @@ This document explains the system for documenting [Zulip's REST
 API](https://zulip.com/api/rest).
 
 Zulip's API documentation is an essential resource both for users and
-for the developers of Zulip's mobile and terminal apps.  Our vision is
+for the developers of Zulip's mobile and terminal apps. Our vision is
 for the documentation to be sufficiently good that developers of
 Zulip's apps should never need to look at the server's implementation
 to answer questions about the API's semantics.
@@ -15,44 +15,44 @@ and remains so as Zulip's API evolves.
 
 In particular, the top goal for this system is that all mistakes in
 verifiable content (i.e. not the English explanations) should cause
-the Zulip test suite to fail.  This is incredibly important, because
+the Zulip test suite to fail. This is incredibly important, because
 once you notice one error in API documentation, you no longer trust it
 to be correct, which ends up wasting the time of its users.
 
 Since it's very difficult to not make little mistakes when writing any
 untested code, the only good solution to this is a way to test
-the documentation.  We found dozens of errors in the process of adding
+the documentation. We found dozens of errors in the process of adding
 the validation Zulip has today.
 
 Our API documentation is defined by a few sets of files:
 
-* Most data describing API endpoints and examples is stored in our
+- Most data describing API endpoints and examples is stored in our
   [OpenAPI configuration](../documentation/openapi.md) at
   `zerver/openapi/zulip.yaml`.
-* The top-level templates live under `templates/zerver/api/*`, and are
+- The top-level templates live under `templates/zerver/api/*`, and are
   written using the Markdown framework that powers our [user
   docs](../documentation/user.md), with some special extensions for
-  rendering nice code blocks and example responses.  We expect to
+  rendering nice code blocks and example responses. We expect to
   eventually remove most of these files where it is possible to
   fully generate the documentation from the OpenAPI files.
-* The text for the Python examples comes from a test suite for the
+- The text for the Python examples comes from a test suite for the
   Python API documentation (`zerver/openapi/python_examples.py`; run via
-  `tools/test-api`).  The `generate_code_example` macro will magically
+  `tools/test-api`). The `generate_code_example` macro will magically
   read content from that test suite and render it as the code example.
   This structure ensures that Zulip's API documentation is robust to a
   wide range of possible typos and other bugs in the API
   documentation.
-* The JavaScript examples are similarly generated and tested using
+- The JavaScript examples are similarly generated and tested using
   `zerver/openapi/javascript_examples.js`.
-* The cURL examples are generated and tested using
+- The cURL examples are generated and tested using
   `zerver/openapi/curl_param_value_generators.py`.
-* The REST API index
+- The REST API index
   (`templates/zerver/help/include/rest-endpoints.md`) in the broader
   /api left sidebar (`templates/zerver/api/sidebar_index.md`).
-* We have an extensive set of tests designed to validate that the data
+- We have an extensive set of tests designed to validate that the data
   in this file is correct, `zerver/tests/test_openapi.py` compares
   every endpoint's accepted parameters in `views` code with those
-  declared in `zulip.yaml`.  And [backend test
+  declared in `zulip.yaml`. And [backend test
   suite](../testing/testing-with-django.md) and checks that every API
   response served during our extensive backend test suite matches one
   the declared OpenAPI schema for that endpoint.
@@ -74,10 +74,10 @@ We highly recommend looking at those resources while reading this page.
 If you look at the documentation for existing endpoints, you'll notice
 that a typical endpoint's documentation is divided into four sections:
 
-* The top-level **Description**
-* **Usage examples**
-* **Arguments**
-* **Responses**
+- The top-level **Description**
+- **Usage examples**
+- **Arguments**
+- **Responses**
 
 The rest of this guide describes how each of these sections works.
 
@@ -94,14 +94,14 @@ relevant feature in `/help/`.
 ### Usage examples
 
 We display usage examples in three languages: Python, JavaScript and
-`curl`; we may add more in the future.  Every endpoint should have
+`curl`; we may add more in the future. Every endpoint should have
 Python and `curl` documentation; `JavaScript` is optional as we don't
-consider that API library to be fully supported.  The examples are
+consider that API library to be fully supported. The examples are
 defined using a special Markdown extension
-(`zerver/openapi/markdown_extension.py`).  To use this extension, one
+(`zerver/openapi/markdown_extension.py`). To use this extension, one
 writes a Markdown file block that looks something like this:
 
-```
+```md
 {start_tabs}
 {tab|python}
 
@@ -121,10 +121,10 @@ writes a Markdown file block that looks something like this:
 
 For the Python examples, you'll write the example in
 `zerver/openapi/python_examples.py`, and it'll be run and verified
-automatically in Zulip's automated test suite.  The code there will
+automatically in Zulip's automated test suite. The code there will
 look something like this:
 
-``` python
+```python
 @openapi_test_function('/messages/render:post')
 def render_message(client: Client) -> None:
     # {code_example|start}
@@ -139,14 +139,14 @@ def render_message(client: Client) -> None:
 ```
 
 This is an actual Python function which will be run as part of the
-`tools/test-api` test suite.  The `validate_against_opanapi_schema`
+`tools/test-api` test suite. The `validate_against_opanapi_schema`
 function will verify that the result of that request is as defined in
 the examples in `zerver/openapi/zulip.yaml`.
 
 To run as part of the testsuite, the `render_message` function needs
 to be called from `test_messages` (or one of the other functions at
-the bottom of the file).  The final function, `test_the_api`, is what
-actually runs the tests.  Tests with the `openapi_test_function`
+the bottom of the file). The final function, `test_the_api`, is what
+actually runs the tests. Tests with the `openapi_test_function`
 decorator that are not called will fail tests, as will new endpoints
 that are not covered by an `openapi_test_function`-decorated test.
 
@@ -164,12 +164,12 @@ wherever that string appears in the API documentation.
 ### Parameters
 
 We have a separate Markdown extension to document the parameters that
-an API endpoint supports.  You'll see this in files like
+an API endpoint supports. You'll see this in files like
 `templates/zerver/api/render-message.md` via the following Markdown
 directive (implemented in
 `zerver/lib/markdown/api_arguments_table_generator.py`):
 
-```
+```md
 {generate_api_arguments_table|zulip.yaml|/messages/render:post}
 ```
 
@@ -186,24 +186,24 @@ You can use the following Markdown directive to render the fixtures
 defined in the OpenAPI `zulip.yaml` for a given endpoint and status
 code:
 
-```
+```md
 {generate_code_example|/messages/render:post|fixture(200)}
 ```
 
 ## Step by step guide
 
 This section offers a step-by-step process for adding documentation
-for a new API endpoint.  It assumes you've read and understood the
+for a new API endpoint. It assumes you've read and understood the
 above.
 
 1. Start by adding [OpenAPI format](../documentation/openapi.md)
-   data to `zerver/openapi/zulip.yaml` for the endpoint.  If you
+   data to `zerver/openapi/zulip.yaml` for the endpoint. If you
    copy-paste (which is helpful to get the indentation structure
    right), be sure to update all the content that you copied to
    correctly describe your endpoint!
 
    In order to do this, you need to figure out how the endpoint in
-   question works by reading the code!  To understand how arguments
+   question works by reading the code! To understand how arguments
    are specified in Zulip backend endpoints, read our [REST API
    tutorial][rest-api-tutorial], paying special attention to the
    details of `REQ` and `has_request_variables`.
@@ -215,13 +215,14 @@ above.
    declared using `REQ`.
 
    You can check your formatting using these helpful tools.
-   * `tools/check-openapi` will verify the syntax of `zerver/openapi/zulip.yaml`.
-   * `tools/test-backend zerver/tests/test_openapi.py`; this test compares
-      your documentation against the code and can find many common
-      mistakes in how arguments are declared.
-   * `test-backend`: The full Zulip backend test suite will fail if
+
+   - `tools/check-openapi` will verify the syntax of `zerver/openapi/zulip.yaml`.
+   - `tools/test-backend zerver/tests/test_openapi.py`; this test compares
+     your documentation against the code and can find many common
+     mistakes in how arguments are declared.
+   - `test-backend`: The full Zulip backend test suite will fail if
      any actual API responses generated by the tests don't match your
-     defined OpenAPI schema.  Use `test-backend --rerun` for a fast
+     defined OpenAPI schema. Use `test-backend --rerun` for a fast
      edit/refresh cycle when debugging.
 
    [rest-api-tutorial]: ../tutorials/writing-views.html#writing-api-rest-endpoints
@@ -229,7 +230,7 @@ above.
 1. Add a function for the endpoint you'd like to document to
    `zerver/openapi/python_examples.py`, decorated with
    `@openapi_test_function`. `render_message` is a good example to
-   follow.  There are generally two key pieces to your test: (1) doing
+   follow. There are generally two key pieces to your test: (1) doing
    an API query and (2) verifying its result has the expected format
    using `validate_against_openapi_schema`.
 
@@ -237,7 +238,7 @@ above.
    bindings don't have a dedicated method for a specific API call,
    you may either use `client.call_endpoint` or add a dedicated
    function to the [zulip PyPI
-   package](https://github.com/zulip/python-zulip-api/tree/master/zulip).
+   package](https://github.com/zulip/python-zulip-api/tree/main/zulip).
    Ultimately, the goal is for every endpoint to be documented the
    latter way, but it's useful to be able to write working
    documentation for an endpoint that isn't supported by
@@ -248,11 +249,11 @@ above.
    function will be called when running `test-api`.
 
 1. Capture the JSON response returned by the API call (the test
-   "fixture").  The easiest way to do this is add an appropriate print
+   "fixture"). The easiest way to do this is add an appropriate print
    statement (usually `json.dumps(result, indent=4, sort_keys=True)`),
-   and then run `tools/test-api`.  You can also use
+   and then run `tools/test-api`. You can also use
    <https://jsonformatter.curiousconcept.com/> to format the JSON
-   fixtures.  Add the fixture to the `example` subsection of the
+   fixtures. Add the fixture to the `example` subsection of the
    `responses` section for the endpoint in
    `zerver/openapi/zulip.yaml`.
 
@@ -266,7 +267,7 @@ above.
    code example on our `/api` page.
 
 1. Finally, write the Markdown file for your API endpoint under
-   `templates/zerver/api/`.  This is usually pretty easy to template
+   `templates/zerver/api/`. This is usually pretty easy to template
    off existing endpoints; but refer to the system explanations above
    for details.
 
@@ -275,7 +276,7 @@ above.
 1. Test your endpoint, pretending to be a new user in a hurry, by
    visiting it via the links on `http://localhost:9991/api` (the API
    docs are rendered from the Markdown source files on page load, so
-   just reload to see an updated version as you edit).  You should
+   just reload to see an updated version as you edit). You should
    make sure that copy-pasting the code in your examples works, and
    post an example of the output in the pull request.
 
@@ -285,22 +286,22 @@ above.
    in `zerver/openapi/zulip.yaml`, which mentions the API feature level
    at which they were added.
 
-[javascript-examples]: https://github.com/zulip/zulip-js/tree/master/examples
+[javascript-examples]: https://github.com/zulip/zulip-js/tree/main/examples
 
 ## Why a custom system?
 
 Given that our documentation is written in large part using the
 OpenAPI format, why maintain a custom Markdown system for displaying
-it?  There's several major benefits to this system:
+it? There's several major benefits to this system:
 
-* It is extremely common for API documentation to become out of date
+- It is extremely common for API documentation to become out of date
   as an API evolves; this automated testing system helps make it
   possible for Zulip to maintain accurate documentation without a lot
   of manual management.
-* Every Zulip server can host correct API documentation for its
+- Every Zulip server can host correct API documentation for its
   version, with the key variables (like the Zulip server URL) already
   pre-substituted for the user.
-* We're able to share implementation language and visual styling with
+- We're able to share implementation language and visual styling with
   our Help Center, which is especially useful for the extensive
   non-REST API documentation pages (e.g. our bot framework).
 

docs/documentation/integrations.md

@@ -10,23 +10,23 @@ integrations).
 
 Usually, this involves a few steps:
 
-* Add text explaining all of the steps required to set up the
+- Add text explaining all of the steps required to set up the
   integration, including what URLs to use, etc. See
   [Writing guidelines](#writing-guidelines) for detailed writing guidelines.
 
   Zulip's pre-defined Markdown macros can be used for some of these steps.
   See [Markdown macros](#markdown-macros) for further details.
 
-* Make sure you've added your integration to
+- Make sure you've added your integration to
   `zerver/lib/integrations.py` in both the `WEBHOOK_INTEGRATIONS`
   section (or `INTEGRATIONS` if not a webhook), and the
-  `DOC_SCREENSHOT_CONFIG` sections.  These registries configure your
+  `DOC_SCREENSHOT_CONFIG` sections. These registries configure your
   integration to appear on the `/integrations` page and make it
   possible to automatically generate the screenshot of a sample
   message (which is important for the screenshots to be updated as
   Zulip's design changes).
 
-* You'll need to add an SVG graphic
+- You'll need to add an SVG graphic
   of your integration's logo under the
   `static/images/integrations/logos/<name>.svg`, where `<name>` is the
   name of the integration, all in lower case; you can usually find them in the
@@ -40,13 +40,13 @@ Usually, this involves a few steps:
   If you cannot find an SVG graphic of the logo, please find and include a PNG
   image of the logo instead.
 
-* Finally, generate a message sent by the integration and take a screenshot of
+- Finally, generate a message sent by the integration and take a screenshot of
   the message to provide an example message in the documentation.
 
   If your new integration is an incoming webhook integration, you can generate
   the screenshot using `tools/generate-integration-docs-screenshot`:
 
-  ```sh
+  ```bash
   ./tools/generate-integration-docs-screenshot --integration integrationname
   ```
 
@@ -71,82 +71,82 @@ always create a new macro by adding a new file to that folder.
 
 Here are a few common macros used to document Zulip's integrations:
 
-* `{!create-stream.md!}` macro - Recommends that users create a dedicated
+- `{!create-stream.md!}` macro - Recommends that users create a dedicated
   stream for a given integration. Usually the first step is setting up an
   integration or incoming webhook. For an example rendering, see **Step 1** of
-  [the docs for Zulip's GitHub integration][GitHub].
+  [the docs for Zulip's GitHub integration][github-integration].
 
-* `{!create-bot-construct-url-indented.md!}` macro - Instructs users to create a bot
+- `{!create-bot-construct-url-indented.md!}` macro - Instructs users to create a bot
   for a given integration and construct a webhook URL using the bot API key
   and stream name. The URL is generated automatically for every incoming webhook
   by using attributes in the `WebhookIntegration` class in
   [zerver/lib/integrations.py][integrations-file].
   This macro is usually used right after `{!create-stream!}`. For an example
-  rendering, see **Step 2** of [the docs for Zulip's GitHub integration][GitHub].
+  rendering, see **Step 2** of [the docs for Zulip's GitHub integration][github-integration].
 
-    **Note:** If special configuration is
-    required to set up the URL and you can't use this macro, be sure to use the
-    `{{ api_url }}` template variable, so that your integration
-    documentation will provide the correct URL for whatever server it is
-    deployed on.  If special configuration is required to set the `SITE`
-    variable, you should document that too.
+  **Note:** If special configuration is
+  required to set up the URL and you can't use this macro, be sure to use the
+  `{{ api_url }}` template variable, so that your integration
+  documentation will provide the correct URL for whatever server it is
+  deployed on. If special configuration is required to set the `SITE`
+  variable, you should document that too.
 
-* `{!append-stream-name.md!}` macro - Recommends appending `&stream=stream_name`
+- `{!append-stream-name.md!}` macro - Recommends appending `&stream=stream_name`
   to a URL in cases where supplying a stream name in the URL is optional.
   Supplying a stream name is optional for most Zulip integrations. If you use
   `{!create-bot-construct-url-indented.md!}`, this macro need not be used.
 
-* `{!append-topic.md!}` macro - Recommends appending `&topic=my_topic` to a URL
+- `{!append-topic.md!}` macro - Recommends appending `&topic=my_topic` to a URL
   to supply a custom topic for webhook notification messages. Supplying a custom
   topic is optional for most Zulip integrations. If you use
   `{!create-bot-construct-url-indented.md!}`, this macro need not be used.
 
-* `{!congrats.md!}` macro - Inserts congratulatory lines signifying the
+- `{!congrats.md!}` macro - Inserts congratulatory lines signifying the
   successful setup of a given integration. This macro is usually used at
   the end of the documentation, right before the sample message screenshot.
   For an example rendering, see the end of
-  [the docs for Zulip's GitHub integration][GitHub].
+  [the docs for Zulip's GitHub integration][github-integration].
 
-* `{!download-python-bindings.md!}` macro - Links to Zulip's
+- `{!download-python-bindings.md!}` macro - Links to Zulip's
   [API page](https://zulip.com/api/) to download and install Zulip's
   API bindings. This macro is usually used in non-webhook integration docs under
   `templates/zerver/integrations/<integration_name>.md`. For an example
   rendering, see **Step 2** of
   [the docs for Zulip's Codebase integration][codebase].
 
-* `{!change-zulip-config-file.md!}` macro - Instructs users to create a bot and
+- `{!change-zulip-config-file.md!}` macro - Instructs users to create a bot and
   specify said bot's credentials in the config file for a given non-webhook
   integration. This macro is usually used in non-webhook integration docs under
   `templates/zerver/integrations/<integration_name>.md`. For an example
   rendering, see **Step 4** of
   [the docs for Zulip's Codebase integration][codebase].
 
-* `{!git-append-branches.md!}` and `{!git-webhook-url-with-branches.md!}` -
+- `{!git-append-branches.md!}` and `{!git-webhook-url-with-branches.md!}` -
   These two macros explain how to specify a list of branches in the webhook URL
   to filter notifications in our Git-related webhooks. For an example rendering,
   see the last paragraph of **Step 2** in
-  [the docs for Zulip's GitHub integration][GitHub].
+  [the docs for Zulip's GitHub integration][github-integration].
 
-* `{!webhook-url.md!}` - Used internally by `{!create-bot-construct-url-indented.md!}`
+- `{!webhook-url.md!}` - Used internally by `{!create-bot-construct-url-indented.md!}`
   to generate the webhook URL.
 
-* `{!zulip-config.md!}` - Used internally by `{!change-zulip-config-file.md!}`
+- `{!zulip-config.md!}` - Used internally by `{!change-zulip-config-file.md!}`
   to specify the lines in the config file for a non-webhook integration.
 
-* `{!webhook-url-with-bot-email.md!}` - Used in certain non-webhook integrations
+- `{!webhook-url-with-bot-email.md!}` - Used in certain non-webhook integrations
   to generate URLs of the form:
 
-    ```
-    https://bot_email:bot_api_key@yourZulipDomain.zulipchat.com/api/v1/external/beanstalk
-    ```
+  ```text
+  https://bot_email:bot_api_key@yourZulipDomain.zulipchat.com/api/v1/external/beanstalk
+  ```
 
-    For an example rendering, see
-    [Zulip's Beanstalk integration](https://zulip.com/integrations/doc/beanstalk).
+  For an example rendering, see
+  [Zulip's Beanstalk integration](https://zulip.com/integrations/doc/beanstalk).
 
-[GitHub]: https://zulip.com/integrations/doc/github
+[github-integration]: https://zulip.com/integrations/doc/github
 [codebase]: https://zulip.com/integrations/doc/codebase
 [beanstalk]: https://zulip.com/integrations/doc/beanstalk
-[integrations-file]: https://github.com/zulip/zulip/blob/master/zerver/lib/integrations.py
+[integrations-file]: https://github.com/zulip/zulip/blob/main/zerver/lib/integrations.py
 
 ## Writing guidelines
 
@@ -189,7 +189,6 @@ concrete guidelines.
 
 - Follow the organization and wording of existing docs as much as possible.
 
-
 ### Guidelines for specific steps
 
 Most doc files should start with a generic sentence about the

docs/documentation/openapi.md

@@ -1,14 +1,14 @@
 # OpenAPI configuration
 
-[OpenAPI][openapi-spec] is a popular format for describing an API.  An
+[OpenAPI][openapi-spec] is a popular format for describing an API. An
 OpenAPI file can be used by various tools to generate documentation
 for the API or even basic client-side bindings for dozens of
 programming languages.
 
-Zulip's API is described in `zerver/openapi/zulip.yaml`.  Our aim is
+Zulip's API is described in `zerver/openapi/zulip.yaml`. Our aim is
 for that file to fully describe every endpoint in the Zulip API, and
 for the Zulip test suite to fail should the API every change without a
-corresponding adjustment to the documentation.  In particular,
+corresponding adjustment to the documentation. In particular,
 essentially all content in Zulip's [REST API
 documentation](../documentation/api.md) is generated from our OpenAPI
 file.
@@ -40,7 +40,8 @@ types of authentication, and configure other settings. Once defined,
 information in this section rarely changes.
 
 For example, the `swagger` and `info` objects look like this:
-```
+
+```yaml
 # Basic Swagger UI info
 openapi: 3.0.1
 info:
@@ -79,7 +80,7 @@ expects a GET request with one
 Basic authentication, and returns a JSON response containing `msg`,
 `result`, and `presence` values.
 
-```
+```yaml
 /users/{user}/presence:
   get:
     description: Get presence data for another user.
@@ -116,10 +117,10 @@ The
 [Definitions Object](https://swagger.io/specification/#definitionsObject)
 contains schemas referenced by other objects. For example,
 `MessageResponse`, the response from the `/messages` endpoint,
-contains three required parameters.  Two are strings, and one is an
+contains three required parameters. Two are strings, and one is an
 integer.
 
-```
+```yaml
 MessageResponse:
   type: object
   required:
@@ -144,14 +145,14 @@ You can find more examples, including GET requests and nested objects, in
 We're collecting decisions we've made on how our Swagger YAML files
 should be organized here:
 
-* Use shared definitions and YAML anchors to avoid duplicating content
+- Use shared definitions and YAML anchors to avoid duplicating content
   where possible.
 
 ## Tips for working with YAML:
 
 You can edit YAML files in any text editor. Indentation defines
 blocks, so whitespace is important (as it is in Python.) TAB
-characters are not permitted.  If your editor has an option to replace
+characters are not permitted. If your editor has an option to replace
 tabs with spaces, this is helpful.
 
 You can also use the
@@ -169,21 +170,21 @@ correct.
 
 ### Formatting help:
 
-* Comments begin with a # character.
+- Comments begin with a # character.
 
-* Descriptions do not need to be in quotes, and may use common
+- Descriptions do not need to be in quotes, and may use common
   Markdown format options like inline code \` (backtick) and `#`
   headings.
 
-* A single `|` (pipe) character begins a multi-line description on the
-  next line.  Single spaced lines (one newline at the end of each) are
-  joined. Use an extra blank line for a paragraph break.  We prefer
+- A single `|` (pipe) character begins a multi-line description on the
+  next line. Single spaced lines (one newline at the end of each) are
+  joined. Use an extra blank line for a paragraph break. We prefer
   to use this format for all descriptions because it doesn't require
   extra effort to expand.
 
 ### Examples:
 
-```
+```yaml
 Description: |
              This description has multiple lines.
              Sometimes descriptions can go on for

docs/documentation/overview.md

@@ -2,27 +2,27 @@
 
 Zulip has three major documentation systems:
 
-* Developer and sysadmin documentation: Documentation for people
+- Developer and sysadmin documentation: Documentation for people
   actually interacting with the Zulip codebase (either by developing
   it or installing it), and written in Markdown.
 
-* Core website documentation: Complete webpages for complex topics,
+- Core website documentation: Complete webpages for complex topics,
   written in HTML, JavaScript, and CSS (using the Django templating
-  system).  These roughly correspond to the documentation someone
-  might look at when deciding whether to use Zulip.  We don't expect
+  system). These roughly correspond to the documentation someone
+  might look at when deciding whether to use Zulip. We don't expect
   to ever have more than about 10 pages written using this system.
 
-* User-facing documentation: Our scalable system for documenting
+- User-facing documentation: Our scalable system for documenting
   Zulip's huge collection of specific features without a lot of
-  overhead or duplicated code/syntax, written in Markdown.  We have
-  several hundred pages written using this system.  There are 3
+  overhead or duplicated code/syntax, written in Markdown. We have
+  several hundred pages written using this system. There are 3
   branches of this documentation:
-  * User documentation (with a target audience of individual Zulip
-  users),
-  * Integrations documentation (with a target audience of IT folks
-  setting up integrations), and
-  * API documentation (with a target audience of developers writing
-  code to extend Zulip).
+  - User documentation (with a target audience of individual Zulip
+    users),
+  - Integrations documentation (with a target audience of IT folks
+    setting up integrations), and
+  - API documentation (with a target audience of developers writing
+    code to extend Zulip).
 
 These three systems are documented in detail.
 
@@ -30,10 +30,10 @@ These three systems are documented in detail.
 
 What you are reading right now is part of the collection of
 documentation targeted at developers and people running their own
-Zulip servers.  These docs are written in
+Zulip servers. These docs are written in
 [CommonMark Markdown](https://commonmark.org/) with a small bit of rST.
 We've chosen Markdown because it is
-[easy to write](https://commonmark.org/help/).  The source for Zulip's
+[easy to write](https://commonmark.org/help/). The source for Zulip's
 developer documentation is at `docs/` in the Zulip Git repository, and
 they are served in production at
 [zulip.readthedocs.io](https://zulip.readthedocs.io/en/latest/).
@@ -43,12 +43,12 @@ your changes), the dependencies are automatically installed as part of
 Zulip development environment provisioning, and you can build the
 documentation using:
 
-```
+```bash
 ./tools/build-docs
 ```
 
 and then opening `http://127.0.0.1:9991/docs/index.html` in your
-browser.  The raw files are available at
+browser. The raw files are available at
 `file:///path/to/zulip/docs/_build/html/index.html` in your browser
 (so you can also use e.g. `firefox docs/_build/html/index.html` from
 the root of your Zulip checkout).
@@ -73,10 +73,10 @@ dependencies).
 
 Zulip has around 10 HTML documentation pages under `templates/zerver`
 for specific major topics, like the features list, client apps,
-integrations, hotkeys, API bindings, etc.  These documents often have
+integrations, hotkeys, API bindings, etc. These documents often have
 somewhat complex HTML and JavaScript, without a great deal of common
 patterns between them other than inheriting from the `portico.html`
-template.  We generally avoid adding new pages to this collection
+template. We generally avoid adding new pages to this collection
 unless there's a good reason, but we don't intend to migrate them,
 either, since this system gives us the flexibility to express these
 important elements of the product clearly.
@@ -91,16 +91,16 @@ to do the things one does a lot in each type of documentation.
 ### General user documentation
 
 Zulip's [help center](https://zulip.com/help/) documentation is
-designed to explain how the product works to end users.  We aim for
+designed to explain how the product works to end users. We aim for
 this to be clear, concise, correct, and readable to nontechnical
-audiences where possible.  See our guide on [writing user
+audiences where possible. See our guide on [writing user
 documentation](user.md).
 
 ### Integrations documentation
 
 Zulip's [integrations documentation](https://zulip.com/integrations)
 is user-facing documentation explaining to end users how to setup each
-of Zulip's more than 100 integrations.  There is a detailed [guide on
+of Zulip's more than 100 integrations. There is a detailed [guide on
 documenting integrations](integrations.md), including style guidelines
 to ensure that the documentation is high quality and consistent.
 
@@ -111,7 +111,7 @@ guide](https://zulip.com/api/integrations-overview).
 
 Zulip's [API documentation](https://zulip.com/api/) is intended to make
 it easy for a technical user to write automation tools that interact
-with Zulip.  This documentation also serves as our main mechanism for
+with Zulip. This documentation also serves as our main mechanism for
 Zulip server developers to communicate with client developers about
 how the Zulip API works.
 
@@ -123,31 +123,31 @@ details on how to contribute to this documentation.
 Zulip has several automated test suites that we run in CI and
 recommend running locally when making significant edits:
 
-* `tools/lint` catches a number of common mistakes, and we highly
-recommend
-[using our linter pre-commit hook](../git/zulip-tools.html#set-up-git-repo-script).
-See the [main linter doc](../testing/linters.md) for more details.
+- `tools/lint` catches a number of common mistakes, and we highly
+  recommend
+  [using our linter pre-commit hook](../git/zulip-tools.html#set-up-git-repo-script).
+  See the [main linter doc](../testing/linters.md) for more details.
 
-* The ReadTheDocs docs are built and the links tested by
-`tools/test-documentation`, which runs `build-docs` and then checks
-all the links.
+- The ReadTheDocs docs are built and the links tested by
+  `tools/test-documentation`, which runs `build-docs` and then checks
+  all the links.
 
 There's an exclude list for the link testing at this horrible path:
 `tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py`,
 which is relevant for flaky links.
 
-* The API docs are tested by `tools/test-api`, which does some basic
-payload verification.  Note that this test does not check for broken
-links (those are checked by `test-help-documentation`).
+- The API docs are tested by `tools/test-api`, which does some basic
+  payload verification. Note that this test does not check for broken
+  links (those are checked by `test-help-documentation`).
 
-* `tools/test-help-documentation` checks `/help/`, `/api/`,
+- `tools/test-help-documentation` checks `/help/`, `/api/`,
   `/integrations/`, and the core website ("portico") documentation for
-  broken links.  Note that the "portico" documentation check has a
+  broken links. Note that the "portico" documentation check has a
   manually maintained whitelist of pages, so if you add a new page to
   this site, you will need to edit `PorticoDocumentationSpider` to add it.
 
-* `tools/test-backend test_docs.py` tests various internal details of
-  the variable substitution logic, as well as rendering.  It's
+- `tools/test-backend test_docs.py` tests various internal details of
+  the variable substitution logic, as well as rendering. It's
   essential when editing the documentation framework, but not
   something you'll usually need to interact with when editing
   documentation.

docs/documentation/user.md

@@ -8,12 +8,13 @@ There are two types of documents: articles about specific features, and a
 handful of longer guides.
 
 The feature articles serve a few different purposes:
-* Feature discovery, for someone browsing the `/help` page, and looking at
+
+- Feature discovery, for someone browsing the `/help` page, and looking at
   the set of titles.
-* Public documentation of our featureset, for someone googling "can zulip do .."
-* Canned responses to support questions; if someone emails a Zulip admin
+- Public documentation of our featureset, for someone googling "can zulip do .."
+- Canned responses to support questions; if someone emails a Zulip admin
   asking "how do I change my name", they can reply with a link to the doc.
-* Feature explanations for new Zulip users and admins, especially for
+- Feature explanations for new Zulip users and admins, especially for
   organization settings.
 
 This system is designed to make writing and maintaining such documentation
@@ -29,7 +30,7 @@ ReadTheDocs, since Zulip supports running a server completely disconnected
 from the Internet, and we'd like the documentation to be available in that
 environment.
 
- The source for this user documentation is the Markdown files under
+The source for this user documentation is the Markdown files under
 `templates/zerver/help/` in the
 [main Zulip server repository](https://github.com/zulip/zulip). The file
 `foo.md` is automatically rendered by the `render_markdown_path` function in
@@ -40,7 +41,7 @@ are usually linked from `static/images/help/`.
 
 This means that you can contribute to the Zulip user documentation by just
 adding to or editing the collection of Markdown files under
-`templates/zerver/help`.  If you have the Zulip development environment
+`templates/zerver/help`. If you have the Zulip development environment
 set up, you simply need to reload your browser on
 `http://localhost:9991/help/foo` to see the latest version of `foo.md`
 rendered.
@@ -52,22 +53,22 @@ experience with.
 
 Tips for adding a new article:
 
-* Find an existing article in the same section of the help documentation,
+- Find an existing article in the same section of the help documentation,
   and copy the format, wording, style, etc as closely as you can.
 
-* If the feature exists in other team chat products, check out their
+- If the feature exists in other team chat products, check out their
   documentation for inspiration.
 
-* Fewer words is better than more. Many Zulip users have English as a second
+- Fewer words is better than more. Many Zulip users have English as a second
   language.
 
-* Try to put yourself in the shoes of a new Zulip user. What would you want
+- Try to put yourself in the shoes of a new Zulip user. What would you want
   to know?
 
-* The goal of user-facing documentation is not to be comprehensive. The goal
+- The goal of user-facing documentation is not to be comprehensive. The goal
   is to give the right bits of information for the intended audience.
 
-* Real estate in the left sidebar is somewhat precious. Minor features
+- Real estate in the left sidebar is somewhat precious. Minor features
   should rarely get their own article.
 
 An anti-pattern is trying to make up for bad UX by adding user
@@ -98,24 +99,24 @@ allows .." rather than "we also allow ..". `You` is ok and used liberally.
 Zulip's Markdown processor allows you to include several special features in
 your documentation to help improve its readability:
 
-* Since raw HTML is supported in Markdown, you can include arbitrary
-HTML/CSS in your documentation as needed.
-* Code blocks allow you to highlight syntax, similar to Zulip's own Markdown.
-* Anchor tags can be used to link to headers in other documents.
-* [Images](#images) of Zulip UI can be added to documentation.
-* Inline [icons](#icons) used to refer to features in the Zulip UI.
-* You can utilize [macros](#macros) to limit repeated content in the
-documentation.
-* You can create special highlight warning blocks using
-[tips and warnings](#tips-and-warnings).
-* You can create tabs using [Markdown tab switcher](#tab-switcher).
+- Since raw HTML is supported in Markdown, you can include arbitrary
+  HTML/CSS in your documentation as needed.
+- Code blocks allow you to highlight syntax, similar to Zulip's own Markdown.
+- Anchor tags can be used to link to headers in other documents.
+- [Images](#images) of Zulip UI can be added to documentation.
+- Inline [icons](#icons) used to refer to features in the Zulip UI.
+- You can utilize [macros](#macros) to limit repeated content in the
+  documentation.
+- You can create special highlight warning blocks using
+  [tips and warnings](#tips-and-warnings).
+- You can create tabs using [Markdown tab switcher](#tab-switcher).
 
 ### Images
 
 Images and screenshots should be included in user documentation only
 if they will help guide the user in how to do something (e.g. if the
 image will make it much clearer which element on the page the user
-should interact with).  For instance, an image of an element should
+should interact with). For instance, an image of an element should
 not be included if the element the user needs to interact with is the
 only thing on the page, but images can be included to show the end
 result of an interaction with the UI.
@@ -126,8 +127,8 @@ instructions for something simple look long and complicated.
 
 When taking screenshots, the image should never include the whole
 Zulip browser window in a screenshot; instead, it should only show
-relevant parts of the app.  In addition, the screenshot should always
-come *after* the text that describes it, never before.
+relevant parts of the app. In addition, the screenshot should always
+come _after_ the text that describes it, never before.
 
 Images are often a part of a numbered step and must be indented four
 spaces to be formatted correctly.
@@ -141,40 +142,40 @@ base class `icon-vector` and have dropped support for it. We now only support
 icons from [FontAwesome](https://fontawesome.com/v4.7.0/) (version 4.7.0) which
 make use of `fa` as a base class.
 
-* cog (<i class="fa fa-cog"></i>) icon — `cog (<i
-class="fa fa-cog"></i>) icon`
-* down chevron (<i class="fa fa-chevron-down"></i>) icon —
-`down chevron (<i class="fa fa-chevron-down"></i>) icon`
-* eye (<i class="fa fa-eye"></i>) icon — `eye (<i
-class="fa fa-eye"></i>) icon`
-* file (<i class="fa fa-file-code-o"></i>) icon — `file (<i
-class="fa fa-file-code-o"></i>) icon`
-* filled star (<i class="fa fa-star"></i>) icon —
-`filled star (<i class="fa fa-star"></i>) icon`
-* formatting (<i class="fa fa-font"></i>) icon —
-`formatting (<i class="fa fa-font"></i>) icon`
-* menu (<i class="fa fa-bars"></i>) icon — `menu (<i
-class="fa fa-bars"></i>) icon`
-* overflow ( <i class="fa fa-ellipsis-v"></i> ) icon —
-`overflow ( <i class="fa fa-ellipsis-v"></i> ) icon`
-* paperclip (<i class="fa fa-paperclip"></i>) icon —
-`paperclip (<i class="fa fa-paperclip"></i>) icon`
-* pencil (<i class="fa fa-pencil"></i>) icon —
-`pencil (<i class="fa fa-pencil"></i>) icon`
-* pencil and paper (<i class="fa fa-pencil-square-o"></i>) icon —
-`pencil and paper (<i class="fa fa-pencil-square-o"></i>) icon`
-* plus (<i class="fa fa-plus"></i>) icon —
-`plus (<i class="fa fa-plus"></i>) icon`
-* smiley face (<i class="fa fa-smile-o"></i>) icon —
-`smiley face (<i class="fa fa-smile-o"></i>) icon`
-* star (<i class="fa fa-star-o"></i>) icon —
-`star (<i class="fa fa-star-o"></i>) icon`
-* trash (<i class="fa fa-trash-o"></i>) icon —
-`trash (<i class="fa fa-trash-o"></i>) icon`
-* video-camera (<i class="fa fa-video-camera"></i>) icon —
-`video-camera (<i class="fa fa-video-camera"></i>) icon`
-* x (<i class="fa fa-times"></i>) icon —
-`x (<i class="fa fa-times"></i>) icon`
+- cog (<i class="fa fa-cog"></i>) icon —
+  `cog (<i class="fa fa-cog"></i>) icon`
+- down chevron (<i class="fa fa-chevron-down"></i>) icon —
+  `down chevron (<i class="fa fa-chevron-down"></i>) icon`
+- eye (<i class="fa fa-eye"></i>) icon —
+  `eye (<i class="fa fa-eye"></i>) icon`
+- file (<i class="fa fa-file-code-o"></i>) icon —
+  `file (<i class="fa fa-file-code-o"></i>) icon`
+- filled star (<i class="fa fa-star"></i>) icon —
+  `filled star (<i class="fa fa-star"></i>) icon`
+- formatting (<i class="fa fa-font"></i>) icon —
+  `formatting (<i class="fa fa-font"></i>) icon`
+- menu (<i class="fa fa-bars"></i>) icon —
+  `menu (<i class="fa fa-bars"></i>) icon`
+- overflow ( <i class="fa fa-ellipsis-v"></i> ) icon —
+  `overflow ( <i class="fa fa-ellipsis-v"></i> ) icon`
+- paperclip (<i class="fa fa-paperclip"></i>) icon —
+  `paperclip (<i class="fa fa-paperclip"></i>) icon`
+- pencil (<i class="fa fa-pencil"></i>) icon —
+  `pencil (<i class="fa fa-pencil"></i>) icon`
+- pencil and paper (<i class="fa fa-pencil-square-o"></i>) icon —
+  `pencil and paper (<i class="fa fa-pencil-square-o"></i>) icon`
+- plus (<i class="fa fa-plus"></i>) icon —
+  `plus (<i class="fa fa-plus"></i>) icon`
+- smiley face (<i class="fa fa-smile-o"></i>) icon —
+  `smiley face (<i class="fa fa-smile-o"></i>) icon`
+- star (<i class="fa fa-star-o"></i>) icon —
+  `star (<i class="fa fa-star-o"></i>) icon`
+- trash (<i class="fa fa-trash-o"></i>) icon —
+  `trash (<i class="fa fa-trash-o"></i>) icon`
+- video-camera (<i class="fa fa-video-camera"></i>) icon —
+  `video-camera (<i class="fa fa-video-camera"></i>) icon`
+- x (<i class="fa fa-times"></i>) icon —
+  `x (<i class="fa fa-times"></i>) icon`
 
 ### Macros
 
@@ -186,22 +187,22 @@ The source for macros is the Markdown files under
 `templates/zerver/help/include` in the
 [main Zulip server repository](https://github.com/zulip/zulip).
 
-* **Administrator only feature** `{!admin-only.md!}`: Notes that the feature
+- **Administrator only feature** `{!admin-only.md!}`: Notes that the feature
   is only available to organization administrators.
 
-* **Message actions** `{!message-actions.md!}`: First step to navigating to
+- **Message actions** `{!message-actions.md!}`: First step to navigating to
   the on-hover message actions.
 
-* **Message actions menu** `{!message-actions-menu.md!}`: Navigate to the
+- **Message actions menu** `{!message-actions-menu.md!}`: Navigate to the
   message actions menu.
 
-* **Save changes** `{!save-changes.md!}`: Save changes after modifying
+- **Save changes** `{!save-changes.md!}`: Save changes after modifying
   organization settings.
 
-* **Stream actions** `{!stream-actions.md!}`: Navigate to the stream actions
+- **Stream actions** `{!stream-actions.md!}`: Navigate to the stream actions
   menu from the left sidebar.
 
-* **Start composing** `{!start-composing.md!}`: Open the compose box.
+- **Start composing** `{!start-composing.md!}`: Open the compose box.
 
 ### Tips and warnings
 
@@ -210,7 +211,7 @@ instructions. For instance, it may address a common problem users may
 encounter while following the instructions, or point to an option for power
 users.
 
-```
+```md
 !!! tip ""
     If you've forgotten your password, see the
     [Change your password](/help/change-your-password) page for
@@ -220,7 +221,7 @@ users.
 A **warning** is a note on what happens when there is some kind of problem.
 Tips are more common than warnings.
 
-```
+```md
 !!! warn ""
     **Note:** If you attempt to input a nonexistent stream name, an error
     message will appear.
@@ -230,27 +231,29 @@ All tips/warnings should appear inside tip/warning blocks. There
 should be only one tip/warning inside each block, and they usually
 should be formatted as a continuation of a numbered step.
 
-###  Tab switcher
+### Tab switcher
 
 Our Markdown processor supports easily creating a tab switcher widget
 design to easily show the instructions for different
 [platforms](https://zulip.com/help/logging-out) in user docs,
-languages in API docs, etc.  To create a tab switcher, write:
+languages in API docs, etc. To create a tab switcher, write:
 
-    {start_tabs}
-    {tab|desktop-web}
-    # First tab's content
-    {tab|ios}
-    # Second tab's content
-    {tab|android}
-    # Third tab's content
-    {end_tabs}
+```md
+{start_tabs}
+{tab|desktop-web}
+# First tab's content
+{tab|ios}
+# Second tab's content
+{tab|android}
+# Third tab's content
+{end_tabs}
+```
 
 The tab identifiers (e.g. `desktop-web` above) and their mappings to
 the tabs' labels are declared in
 [zerver/lib/markdown/tabbed_sections.py][tabbed-sections-code].
 
-[tabbed-sections-code]: https://github.com/zulip/zulip/blob/master/zerver/lib/markdown/tabbed_sections.py
+[tabbed-sections-code]: https://github.com/zulip/zulip/blob/main/zerver/lib/markdown/tabbed_sections.py
 
 This widget can also be used just to create a nice box around a set of
 instructions

docs/git/cheat-sheet.md

@@ -5,111 +5,111 @@ See also [fixing commits][fix-commit]
 ## Common commands
 
 - add
-    - `git add foo.py`
+  - `git add foo.py`
 - checkout
-    - `git checkout -b new-branch-name`
-    - `git checkout master`
-    - `git checkout old-branch-name`
+  - `git checkout -b new-branch-name`
+  - `git checkout main`
+  - `git checkout old-branch-name`
 - commit
-    - `git commit -m "topic: Commit message title."`
-    - `git commit --amend`: Modify the previous commit.
+  - `git commit -m "topic: Commit message title."`
+  - `git commit --amend`: Modify the previous commit.
 - config
-    - `git config --global core.editor nano`
-    - `git config --global core.symlinks true`
+  - `git config --global core.editor nano`
+  - `git config --global core.symlinks true`
 - diff
-    - `git diff`
-    - `git diff --cached`
-    - `git diff HEAD~2..`
+  - `git diff`
+  - `git diff --cached`
+  - `git diff HEAD~2..`
 - fetch
-    - `git fetch origin`
-    - `git fetch upstream`
+  - `git fetch origin`
+  - `git fetch upstream`
 - grep
-    - `git grep update_unread_counts`
+  - `git grep update_unread_counts`
 - log
-    - `git log`
+  - `git log`
 - pull
-    - `git pull --rebase`: **Use this**. Zulip uses a [rebase oriented workflow][git-overview].
-    - `git pull` (with no options): Will either create a merge commit
-      (which you don't want) or do the same thing as `git pull --rebase`,
-      depending on [whether you've configured Git properly][git-config-clone]
+  - `git pull --rebase`: **Use this**. Zulip uses a [rebase oriented workflow][git-overview].
+  - `git pull` (with no options): Will either create a merge commit
+    (which you don't want) or do the same thing as `git pull --rebase`,
+    depending on [whether you've configured Git properly][git-config-clone]
 - push
-    - `git push origin +branch-name`
+  - `git push origin +branch-name`
 - rebase
-    - `git rebase -i HEAD~3`
-    - `git rebase -i master`
-    - `git rebase upstream/master`
+  - `git rebase -i HEAD~3`
+  - `git rebase -i main`
+  - `git rebase upstream/main`
 - reflog
-    - `git reflog | head -10`
+  - `git reflog | head -10`
 - remote
-    - `git remote -v`
+  - `git remote -v`
 - reset
-    - `git reset HEAD~2`
+  - `git reset HEAD~2`
 - rm
-    - `git rm oops.txt`
+  - `git rm oops.txt`
 - show
-    - `git show HEAD`
-    - `git show HEAD~~~`
-    - `git show master`
+  - `git show HEAD`
+  - `git show HEAD~~~`
+  - `git show main`
 - status
-    - `git status`
+  - `git status`
 
 ## Detailed cheat sheet
 
 - add
-    - `git add foo.py`: add `foo.py` to the staging area
-    - `git add foo.py bar.py`: add `foo.py` AND `bar.py` to the staging area
-    - `git add -u`: Adds all tracked files to the staging area.
+  - `git add foo.py`: add `foo.py` to the staging area
+  - `git add foo.py bar.py`: add `foo.py` AND `bar.py` to the staging area
+  - `git add -u`: Adds all tracked files to the staging area.
 - checkout
-    - `git checkout -b new-branch-name`: create branch `new-branch-name` and switch to/check out that new branch
-    - `git checkout master`: switch to your `master` branch
-    - `git checkout old-branch-name`: switch to an existing branch `old-branch-name`
+  - `git checkout -b new-branch-name`: create branch `new-branch-name` and switch to/check out that new branch
+  - `git checkout main`: switch to your `main` branch
+  - `git checkout old-branch-name`: switch to an existing branch `old-branch-name`
 - commit
-    - `git commit -m "commit message"`: It is recommended to type a
-       multiline commit message, however.
-    - `git commit`: Opens your default text editor to write a commit message.
-    - `git commit --amend`: changing the last commit message. Read more [here][fix-commit]
+  - `git commit -m "commit message"`: It is recommended to type a
+    multiline commit message, however.
+  - `git commit`: Opens your default text editor to write a commit message.
+  - `git commit --amend`: changing the last commit message. Read more [here][fix-commit]
 - config
-    - `git config --global core.editor nano`: set core editor to `nano` (you can set this to `vim` or others)
-    - `git config --global core.symlinks true`: allow symbolic links
+  - `git config --global core.editor nano`: set core editor to `nano` (you can set this to `vim` or others)
+  - `git config --global core.symlinks true`: allow symbolic links
 - diff
-    - `git diff`: display the changes you have made to all files
-    - `git diff --cached`: display the changes you have made to staged files
-    - `git diff HEAD~2..`: display the 2 most recent changes you have made to files
+  - `git diff`: display the changes you have made to all files
+  - `git diff --cached`: display the changes you have made to staged files
+  - `git diff HEAD~2..`: display the 2 most recent changes you have made to files
 - fetch
-    - `git fetch origin`: fetch origin repository
-    - `git fetch upstream`: fetch upstream repository
+  - `git fetch origin`: fetch origin repository
+  - `git fetch upstream`: fetch upstream repository
 - grep
-    - `git grep update_unread_counts static/js`: Search our JS for references to update_unread_counts.
+  - `git grep update_unread_counts static/js`: Search our JS for references to update_unread_counts.
 - log
-    - `git log`: show commit logs
-    - `git log --oneline | head`: To quickly see the latest ten commits on a branch.
+  - `git log`: show commit logs
+  - `git log --oneline | head`: To quickly see the latest ten commits on a branch.
 - pull
-    - `git pull --rebase`: rebase your changes on top of master.
-    - `git pull` (with no options): Will either create a merge commit
-      (which you don't want) or do the same thing as `git pull --rebase`,
-      depending on [whether you've configured Git properly][git-config-clone]
+  - `git pull --rebase`: rebase your changes on top of `main`.
+  - `git pull` (with no options): Will either create a merge commit
+    (which you don't want) or do the same thing as `git pull --rebase`,
+    depending on [whether you've configured Git properly][git-config-clone]
 - push
-    - `git push origin branch-name`: push you commits to the origin repository *only if* there are no conflicts.
-      Use this when collaborating with others to prevent overwriting their work.
-    - `git push origin +branch-name`: force push your commits to your origin repository.
+  - `git push origin branch-name`: push you commits to the origin repository _only if_ there are no conflicts.
+    Use this when collaborating with others to prevent overwriting their work.
+  - `git push origin +branch-name`: force push your commits to your origin repository.
 - rebase
-    - `git rebase -i HEAD~3`: interactive rebasing current branch with first three items on HEAD
-    - `git rebase -i master`: interactive rebasing current branch with master branch
-    - `git rebase upstream/master`: rebasing current branch with master branch from upstream repository
+  - `git rebase -i HEAD~3`: interactive rebasing current branch with first three items on HEAD
+  - `git rebase -i main`: interactive rebasing current branch with `main` branch
+  - `git rebase upstream/main`: rebasing current branch with `main` branch from upstream repository
 - reflog
-    - `git reflog | head -10`: manage reference logs for the past 10 commits
+  - `git reflog | head -10`: manage reference logs for the past 10 commits
 - remote
-    - `git remote -v`: display your origin and upstream repositories
+  - `git remote -v`: display your origin and upstream repositories
 - reset
-    - `git reset HEAD~2`: reset two most recent commits
+  - `git reset HEAD~2`: reset two most recent commits
 - rm
-    - `git rm oops.txt`: remove `oops.txt`
+  - `git rm oops.txt`: remove `oops.txt`
 - show
-    - `git show HEAD`: display most recent commit
-    - `git show HEAD~~~`: display third most recent commit
-    - `git show master`: display most recent commit on `master`
+  - `git show HEAD`: display most recent commit
+  - `git show HEAD~~~`: display third most recent commit
+  - `git show main`: display most recent commit on `main`
 - status
-    - `git status`: show the working tree status, unstaged and staged files
+  - `git status`: show the working tree status, unstaged and staged files
 
 [fix-commit]: fixing-commits.md
 [git-config-clone]: cloning.html#step-1b-clone-to-your-machine

docs/git/cloning.md

@@ -20,7 +20,7 @@ the main server app, this is [zulip/zulip][github-zulip-zulip].
 
 Next, clone your fork to your local machine:
 
-```
+```console
 $ git clone --config pull.rebase https://github.com/YOUR_USERNAME/zulip.git
 Cloning into 'zulip'
 remote: Counting objects: 86768, done.
@@ -32,12 +32,12 @@ Checking connectivity... done.
 ```
 
 (The `--config pull.rebase` option configures Git so that `git pull`
-will behave like `git pull --rebase` by default.  Using `git pull
---rebase` to update your changes to resolve merge conflicts is
-expected by essentially all of open source projects, including Zulip.
-You can also set that option after cloning using `git config --add
-pull.rebase true`, or just be careful to always run `git pull
---rebase`, never `git pull`).
+will behave like `git pull --rebase` by default. Using
+`git pull --rebase` to update your changes to resolve merge conflicts
+is expected by essentially all of open source projects, including
+Zulip. You can also set that option after cloning using
+`git config --add pull.rebase true`, or just be careful to always run
+`git pull --rebase`, never `git pull`).
 
 Note: If you receive an error while cloning, you may not have [added your ssh
 key to GitHub][github-help-add-ssh-key].
@@ -56,7 +56,7 @@ your fork.
 
 First, show the currently configured remote repository:
 
-```
+```console
 $ git remote -v
 origin  git@github.com:YOUR_USERNAME/zulip.git (fetch)
 origin  git@github.com:YOUR_USERNAME/zulip.git (push)
@@ -65,10 +65,10 @@ origin  git@github.com:YOUR_USERNAME/zulip.git (push)
 Note: If you've cloned the repository using a graphical client, you may already
 have the upstream remote repository configured. For example, when you clone
 [zulip/zulip][github-zulip-zulip] with the GitHub desktop client it configures
-the remote repository `zulip` and you see the following output from `git remote
--v`:
+the remote repository `zulip` and you see the following output from
+`git remote -v`:
 
-```
+```console
 origin  git@github.com:YOUR_USERNAME/zulip.git (fetch)
 origin  git@github.com:YOUR_USERNAME/zulip.git (push)
 zulip    https://github.com/zulip/zulip.git (fetch)
@@ -78,13 +78,13 @@ zulip    https://github.com/zulip/zulip.git (push)
 If your client hasn't automatically configured a remote for zulip/zulip, you'll
 need to with:
 
-```
+```console
 $ git remote add -f upstream https://github.com/zulip/zulip.git
 ```
 
 Finally, confirm that the new remote repository, upstream, has been configured:
 
-```
+```console
 $ git remote -v
 origin  git@github.com:YOUR_USERNAME/zulip.git (fetch)
 origin  git@github.com:YOUR_USERNAME/zulip.git (push)
@@ -115,13 +115,13 @@ will run tests for new refs you push to GitHub and email you the outcome
 
 Running CI against your fork can help save both your and the
 Zulip maintainers time by making it easy to test a change fully before
-submitting a pull request.  We generally recommend a workflow where as
+submitting a pull request. We generally recommend a workflow where as
 you make changes, you use a fast edit-refresh cycle running individual
-tests locally until your changes work.  But then once you've gotten
+tests locally until your changes work. But then once you've gotten
 the tests you'd expect to be relevant to your changes working, push a
 branch to run the full test suite in GitHub Actions before
-you create a pull request.  While you wait for GitHub Actions jobs
-to run, you can start working on your next task.  When the tests finish,
+you create a pull request. While you wait for GitHub Actions jobs
+to run, you can start working on your next task. When the tests finish,
 you can create a pull request that you already know passes the tests.
 
 GitHub Actions will run all the jobs by default on your forked repository.

docs/git/collaborate.md

@@ -6,7 +6,7 @@ What happens when you would like to collaborate with another contributor and
 they have work-in-progress on their own fork of Zulip? No problem! Just add
 their fork as a remote and pull their changes.
 
-```
+```console
 $ git remote add <username> https://github.com/<username>/zulip.git
 $ git fetch <username>
 ```
@@ -15,12 +15,13 @@ Now you can check out their branch just like you would any other. You can name
 the branch anything you want, but using both the username and branch name will
 help you keep things organized.
 
-```
+```console
 $ git checkout -b <username>/<branchname>
 ```
 
 You can choose to rename the branch if you prefer:
-```
+
+```bash
 git checkout -b <custombranchname> <username>/<branchname>
 ```
 
@@ -31,27 +32,28 @@ pull request locally. GitHub provides a special syntax
 ([details][github-help-co-pr-locally]) for this since pull requests are
 specific to GitHub rather than Git.
 
-First, fetch and create a branch for the pull request, replacing *ID* and
-*BRANCHNAME* with the ID of the pull request and your desired branch name:
+First, fetch and create a branch for the pull request, replacing _ID_ and
+_BRANCHNAME_ with the ID of the pull request and your desired branch name:
 
-```
+```console
 $ git fetch upstream pull/ID/head:BRANCHNAME
 ```
 
 Now switch to the branch:
 
-```
+```console
 $ git checkout BRANCHNAME
 ```
 
 Now you work on this branch as you would any other.
 
 Note: you can use the scripts provided in the tools/ directory to fetch pull
-requests. You can read more about what they do [here][tools-PR].
-```
+requests. You can read more about what they do [here][tools-pr].
+
+```bash
 tools/fetch-rebase-pull-request <PR-number>
 tools/fetch-pull-request <PR-number>
 ```
 
 [github-help-co-pr-locally]: https://help.github.com/en/articles/checking-out-pull-requests-locally
-[tools-PR]: ../git/zulip-tools.html#fetch-a-pull-request-and-rebase
+[tools-pr]: ../git/zulip-tools.html#fetch-a-pull-request-and-rebase

docs/git/fixing-commits.md

@@ -1,35 +1,45 @@
 # Fixing commits
+
 This is mostly from
 [here](https://help.github.com/en/articles/changing-a-commit-message#rewriting-the-most-recent-commit-message).
 
 ## Fixing the last commit
+
 ### Changing the last commit message
+
 1. `git commit --amend -m "New message"`
 
 ### Changing the last commit
+
 1. Make your changes to the files
 2. Run `git add <filename>` to add one file or `git add <filename1> <filename2> ...` to add multiple files
 3. `git commit --amend`
 
 ## Fixing older commits
+
 ### Changing commit messages
+
 1. `git rebase -i HEAD~5` (if, for example, you are editing some of the last five commits)
 2. For each commit that you want to change the message, change `pick` to `reword`, and save
 3. Change the commit messages
 
 ### Deleting old commits
+
 1. `git rebase -i HEAD~n` where `n` is the number of commits you are looking at
 2. For each commit that you want to delete, change `pick` to `drop`, and save
 
 ## Squashing commits
+
 Sometimes, you want to make one commit out of a bunch of commits. To do this,
 
 1. `git rebase -i HEAD~n` where `n` is the number of commits you are interested in
 2. Change `pick` to `squash` on the lines containing the commits you want to squash and save
 
 ## Reordering commits
+
 1. `git rebase -i HEAD~n` where `n` is the number of commits you are interested in
 2. Reorder the lines containing the commits and save
 
 ## Pushing commits after tidying them
-1. `git push origin +my-feature-branch`  (Note the `+` there and substitute your actual branch name.)
+
+1. `git push origin +my-feature-branch` (Note the `+` there and substitute your actual branch name.)

docs/git/overview.md

@@ -10,7 +10,7 @@ with these details in mind:
   [repository][github-zulip], if you are working on something else besides
   Zulip server) to your own account and then create feature/issue branches.
   When you're ready to get feedback, submit a work-in-progress (WIP) pull
-  request. *We encourage you to submit WIP pull requests early and often.*
+  request. _We encourage you to submit WIP pull requests early and often._
 
 - We use a **[rebase][gitbook-rebase]-oriented workflow.** We do not use merge
   commits. This means you should use `git fetch` followed by `git rebase`
@@ -22,15 +22,15 @@ with these details in mind:
 
   We use this strategy in order to avoid the extra commits that appear
   when another branch is merged, that clutter the commit history (it's
-  popular with other large projects such as Django).  This makes
+  popular with other large projects such as Django). This makes
   Zulip's commit history more readable, but a side effect is that many
-  pull requests we merge will be reported by GitHub's UI as *closed*
-  instead of *merged*, since GitHub has poor support for
+  pull requests we merge will be reported by GitHub's UI as _closed_
+  instead of _merged_, since GitHub has poor support for
   rebase-oriented workflows.
 
 - We have a **[code style guide][zulip-rtd-code-style]**, a **[commit message
-  guide][zulip-rtd-commit-messages]**, and strive for each commit to be *a
-  minimal coherent idea* (see **[commit
+  guide][zulip-rtd-commit-messages]**, and strive for each commit to be _a
+  minimal coherent idea_ (see **[commit
   discipline][zulip-rtd-commit-discipline]** for details).
 
 - We provide **many tools to help you submit quality code.** These include
@@ -48,7 +48,7 @@ with these details in mind:
 Finally, install the [Zulip developer environment][zulip-rtd-dev-overview], and then
 [configure continuous integration for your fork][zulip-git-guide-fork-ci].
 
-***
+---
 
 The following sections will help you be awesome with Zulip and Git/GitHub in a
 rebased-based workflow. Read through it if you're new to Git, to a rebase-based

docs/git/pull-requests.md

@@ -3,7 +3,7 @@
 When you're ready for feedback, submit a pull request. Pull requests
 are a feature specific to GitHub. They provide a simple, web-based way
 to submit your work (often called "patches") to a project. It's called
-a *pull request* because you're asking the project to *pull changes*
+a _pull request_ because you're asking the project to _pull changes_
 from your fork.
 
 If you're unfamiliar with how to create a pull request, you can check
@@ -20,22 +20,22 @@ requests early and often. This allows you to share your code to make
 it easier to get feedback and help with your changes. Prefix the
 titles of work-in-progress pull requests with **[WIP]**, which in our
 project means that you don't think your pull request is ready to be
-merged (e.g. it might not work or pass tests).  This sets expectations
+merged (e.g. it might not work or pass tests). This sets expectations
 correctly for any feedback from other developers, and prevents your
 work from being merged before you're confident in it.
 
 ## Create a pull request
 
-### Step 0: Make sure you're on a feature branch (not `master`)
+### Step 0: Make sure you're on a feature branch (not `main`)
 
 It is important to [work on a feature
 branch](using.html#work-on-a-feature-branch) when creating a pull
-request.  Your new pull request will be inextricably linked with your
+request. Your new pull request will be inextricably linked with your
 branch while it is open, so you will need to reserve your branch only
 for changes related to your issue, and avoid introducing extraneous
 changes for other issues or from upstream.
 
-If you are working on a branch named `master`, you need to create and
+If you are working on a branch named `main`, you need to create and
 switch to a feature branch before proceeding.
 
 ### Step 1: Update your branch with git rebase
@@ -44,9 +44,9 @@ The best way to update your branch is with `git fetch` and `git rebase`. Do not
 use `git pull` or `git merge` as this will create merge commits. See [keep your
 fork up to date][keep-up-to-date] for details.
 
-Here's an example (you would replace *issue-123* with the name of your feature branch):
+Here's an example (you would replace _issue-123_ with the name of your feature branch):
 
-```
+```console
 $ git checkout issue-123
 Switched to branch 'issue-123'
 
@@ -56,9 +56,9 @@ remote: Compressing objects: 100% (23/23), done.
 remote: Total 69 (delta 49), reused 39 (delta 39), pack-reused 7
 Unpacking objects: 100% (69/69), done.
 From https://github.com/zulip/zulip
-   69fa600..43e21f6  master     -> upstream/master
+   69fa600..43e21f6  main     -> upstream/main
 
-$ git rebase upstream/master
+$ git rebase upstream/main
 
 First, rewinding head to replay your work on top of it...
 Applying: troubleshooting tip about provisioning
@@ -68,7 +68,7 @@ Applying: troubleshooting tip about provisioning
 
 Once you've updated your local feature branch, push the changes to GitHub:
 
-```
+```console
 $ git push origin issue-123
 Counting objects: 6, done.
 Delta compression using up to 4 threads.
@@ -83,7 +83,7 @@ To git@github.com:christi3k/zulip.git
 If your push is rejected with error **failed to push some refs** then you need
 to prefix the name of your branch with a `+`:
 
-```
+```console
 $ git push origin +issue-123
 Counting objects: 6, done.
 Delta compression using up to 4 threads.
@@ -117,7 +117,7 @@ pull request** button.
 Alternatively, if you've recently pushed to your fork, you will see a green
 **Compare & pull request** button.
 
-You'll see the *Open a pull request* page:
+You'll see the _Open a pull request_ page:
 
 ![images-create-pr]
 

docs/git/reviewing.md

@@ -8,20 +8,20 @@ on reviewing changes by other contributors.
 
 Display changes between index and working tree (what is not yet staged for commit):
 
-```
+```console
 $ git diff
 ```
 
 Display changes between index and last commit (what you have staged for commit):
 
-```
+```console
 $ git diff --cached
 ```
 
 Display changes in working tree since last commit (changes that are staged as
 well as ones that are not):
 
-```
+```console
 $ git diff HEAD
 ```
 
@@ -31,34 +31,34 @@ Use any git-ref to compare changes between two commits on the current branch.
 
 Display changes between commit before last and last commit:
 
-```
+```console
 $ git diff HEAD^ HEAD
 ```
 
 Display changes between two commits using their hashes:
 
-```
+```console
 $ git diff e2f404c 7977169
 ```
 
 ## Changes between branches
 
-Display changes between tip of topic branch and tip of master branch:
+Display changes between tip of `topic` branch and tip of `main` branch:
 
-```
-$ git diff topic master
+```console
+$ git diff topic main
 ```
 
-Display changes that have occurred on master branch since topic branch was created:
+Display changes that have occurred on `main` branch since `topic` branch was created:
 
-```
-$ git diff topic...master
+```console
+$ git diff topic...main
 ```
 
-Display changes you've committed so far since creating a branch from upstream/master:
+Display changes you've committed so far since creating a branch from `upstream/main`:
 
-```
-$ git diff upstream/master...HEAD
+```console
+$ git diff upstream/main...HEAD
 ```
 
 [zulip-rtd-review]: ../contributing/code-reviewing.md

docs/git/setup.md

@@ -15,14 +15,14 @@ You'll also need a GitHub account, which you can sign up for
 [here][github-join].
 
 We highly recommend you create an SSH key if you don't already have
-one and [add it to your GitHub account][github-help-add-ssh-key].  If
+one and [add it to your GitHub account][github-help-add-ssh-key]. If
 you don't, you'll have to type your GitHub username and password every
 time you interact with GitHub, which is usually several times a day.
 
 We also highly recommend the following:
 
 - [Configure Git][gitbook-config] with your name and email and
-  [aliases][gitbook-aliases] for commands you'll use often.  We
+  [aliases][gitbook-aliases] for commands you'll use often. We
   recommend using your full name (not just your first name), since
   that's what we'll use to give credit to your work in places like the
   Zulip release notes.

docs/git/terminology.md

@@ -2,9 +2,10 @@
 
 When you install Git, it adds a manual entry for `gitglossary`. You can view
 this glossary by running `man gitglossary`. Below we've included the Git terms
-you'll encounter most often along with their definitions from *gitglossary*.
+you'll encounter most often along with their definitions from _gitglossary_.
 
 ## branch
+
 A "branch" is an active line of development. The most recent commit
 on a branch is referred to as the tip of that branch. The tip of
 the branch is referenced by a branch head, which moves forward as
@@ -14,14 +15,17 @@ working tree is associated with just one of them (the "current" or
 "checked out" branch), and HEAD points to that branch.
 
 ## cache
+
 Obsolete for: index
 
 ## checkout
+
 The action of updating all or part of the working tree with a tree
 object or blob from the object database, and updating the index and
 HEAD if the whole working tree has been pointed at a new branch.
 
 ## commit
+
 As a noun: A single point in the Git history; the entire history of
 a project is represented as a set of interrelated commits. The word
 "commit" is often used by Git in the same places other revision
@@ -33,6 +37,7 @@ state in the Git history, by creating a new commit representing the
 current state of the index and advancing HEAD to point at the new
 
 ## fast-forward
+
 A fast-forward is a special type of merge where you have a revision
 and you are "merging" another branch's changes that happen to be a
 descendant of what you have. In such these cases, you do not make a
@@ -41,19 +46,23 @@ happen frequently on a remote-tracking branch of a remote
 repository.
 
 ## fetch
+
 Fetching a branch means to get the branch's head ref from a remote
 repository, to find out which objects are missing from the local
 object database, and to get them, too. See also [git-fetch(1)](https://git-scm.com/docs/git-fetch)
 
 ## hash
+
 In Git's context, synonym for object name.
 
 ## head
+
 A named reference to the commit at the tip of a branch. Heads are
 stored in a file in $GIT_DIR/refs/heads/ directory, except when
 using packed refs. See also [git-pack-refs(1)](https://git-scm.com/docs/git-pack-refs).
 
 ## HEAD
+
 The current branch. In more detail: Your working tree is normally
 derived from the state of the tree referred to by HEAD. HEAD is a
 reference to one of the heads in your repository, except when using
@@ -61,15 +70,18 @@ a detached HEAD, in which case it directly references an arbitrary
 commit.
 
 ## index
+
 A collection of files with stat information, whose contents are
 stored as objects. The index is a stored version of your working
 tree. Truth be told, it can also contain a second, and even a third
 version of a working tree, which are used when merging.
 
 ## pull
+
 Pulling a branch means to fetch it and merge it. See also [git-pull(1)](https://git-scm.com/docs/git-pull)
 
 ## push
+
 Pushing a branch means to get the branch's head ref from a remote
 repository, find out if it is a direct ancestor to the branch's
 local head ref, and in that case, putting all objects, which are
@@ -79,5 +91,6 @@ the remote head ref. If the remote head is not an ancestor to the
 local head, the push fails.
 
 ## rebase
+
 To reapply a series of changes from a branch to a different base,
 and reset the head of that branch to the result.

docs/git/the-git-difference.md

@@ -2,22 +2,22 @@
 
 Whether you're new to Git or have experience with another version control
 system (VCS), it's a good idea to learn a bit about how Git works. We recommend
-this excellent presentation *[Understanding Git][understanding-git]* from
+this excellent presentation _[Understanding Git][understanding-git]_ from
 Nelson Elhage and Anders Kaseorg and the [Git Basics][gitbook-basics] chapter
-from *Pro Git* by Scott Chacon and Ben Straub.
+from _Pro Git_ by Scott Chacon and Ben Straub.
 
 Here are the top things to know:
 
 - **Git works on snapshots.** Unlike other version control systems (e.g.,
   Subversion, Perforce, Bazaar), which track files and changes to those files
-  made over time, Git tracks *snapshots* of your project. Each time you commit
+  made over time, Git tracks _snapshots_ of your project. Each time you commit
   or otherwise make a change to your repository, Git takes a snapshot of your
   project and stores a reference to that snapshot. If a file hasn't changed,
   Git creates a link to the identical file rather than storing it again.
 
 - **Most Git operations are local.** Git is a distributed version control
   system, so once you've cloned a repository, you have a complete copy of that
-  repository's *entire history*. Staging, committing, branching, and browsing
+  repository's _entire history_. Staging, committing, branching, and browsing
   history are all things you can do locally without network access and without
   immediately affecting any remote repositories. To make or receive changes
   from remote repositories, you need to `git fetch`, `git pull`, or `git push`.
@@ -45,9 +45,9 @@ Here are the top things to know:
 
 - **Cloning a repository creates a working copy.** Every working copy has a
   `.git` subdirectory, which contains its own Git repository. The `.git`
-  subdirectory also tracks the *index*, a staging area for changes that will
-  become part of the next commit. All files outside of `.git` is the *working
-  tree*.
+  subdirectory also tracks the _index_, a staging area for changes that will
+  become part of the next commit. All files outside of `.git` is the _working
+  tree_.
 
 - **Files tracked with Git have possible three states: committed, modified, and
   staged.** Committed files are those safely stored in your local `.git`
@@ -56,8 +56,8 @@ Here are the top things to know:
   changes but have not yet been marked for inclusion in the next commit; they
   have not been added to the index.
 
-- **Git commit workflow is as follows.** Edit files in your *working tree*. Add
-  to the *index* (that is *stage*) with `git add`. *Commit* to the HEAD of the
+- **Git commit workflow is as follows.** Edit files in your _working tree_. Add
+  to the _index_ (that is _stage_) with `git add`. _Commit_ to the HEAD of the
   current branch with `git commit`.
 
 [gitbook-basics]: https://git-scm.com/book/en/v2/Getting-Started-Git-Basics

docs/git/troubleshooting.md

@@ -26,8 +26,8 @@ A merge commit is usually created when you've run `git pull` or `git merge`.
 You'll know you're creating a merge commit if you're prompted for a commit
 message and the default is something like this:
 
-```
-Merge branch 'master' of https://github.com/zulip/zulip
+```text
+Merge branch 'main' of https://github.com/zulip/zulip
 
 # Please enter a commit message to explain why this merge is necessary,
 # especially if it merges an updated upstream into a topic branch.
@@ -38,13 +38,13 @@ Merge branch 'master' of https://github.com/zulip/zulip
 
 And the first entry for `git log` will show something like:
 
-```
+```console
 commit e5f8211a565a5a5448b93e98ed56415255546f94
 Merge: 13bea0e e0c10ed
 Author: Christie Koehler <ck@christi3k.net>
 Date:   Mon Oct 10 13:25:51 2016 -0700
 
-    Merge branch 'master' of https://github.com/zulip/zulip
+    Merge branch 'main' of https://github.com/zulip/zulip
 ```
 
 Some graphical Git clients may also create merge commits.
@@ -52,10 +52,10 @@ Some graphical Git clients may also create merge commits.
 To undo a merge commit, first run `git reflog` to identify the commit you want
 to roll back to:
 
-```
+```console
 $ git reflog
 
-e5f8211 HEAD@{0}: pull upstream master: Merge made by the 'recursive' strategy.
+e5f8211 HEAD@{0}: pull upstream main: Merge made by the 'recursive' strategy.
 13bea0e HEAD@{1}: commit: test commit for docs.
 ```
 
@@ -67,19 +67,18 @@ by `git pull` and `13bea0e HEAD@{1}:` is the last commit I made before running
 Once you'd identified the ref you want to revert to, you can do so with [git
 reset][gitbook-reset]:
 
-```
+```console
 $ git reset --hard 13bea0e
 HEAD is now at 13bea0e test commit for docs.
 ```
 
-```eval_rst
-.. important::
-    ``git reset --hard <commit>`` will discard all changes in your
-    working directory and index since the commit you're resetting to with
-    ``<commit>``. *This is the main way you can lose work in Git*. If you need
-    to keep any changes that are in your working directory or that you have
-    committed, use ``git reset --merge <commit>`` instead.
-```
+:::{important}
+`git reset --hard <commit>` will discard all changes in your
+working directory and index since the commit you're resetting to with
+`<commit>`. _This is the main way you can lose work in Git_. If you need
+to keep any changes that are in your working directory or that you have
+committed, use `git reset --merge <commit>` instead.
+:::
 
 You can also use the relative reflog `HEAD@{1}` instead of the commit hash,
 just keep in mind that this changes as you run git commands.
@@ -87,17 +86,17 @@ just keep in mind that this changes as you run git commands.
 Now when you look at the output of `git reflog`, you should see that the tip of your branch points to your
 last commit `13bea0e` before the merge:
 
-```
+```console
 $ git reflog
 
 13bea0e HEAD@{2}: reset: moving to HEAD@{1}
-e5f8211 HEAD@{3}: pull upstream master: Merge made by the 'recursive' strategy.
+e5f8211 HEAD@{3}: pull upstream main: Merge made by the 'recursive' strategy.
 13bea0e HEAD@{4}: commit: test commit for docs.
 ```
 
 And the first entry `git log` shows is this:
 
-```
+```console
 commit 13bea0e40197b1670e927a9eb05aaf50df9e8277
 Author: Christie Koehler <ck@christi3k.net>
 Date:   Mon Oct 10 13:25:38 2016 -0700
@@ -115,32 +114,32 @@ with `git cherry-pick` ([docs][gitbook-git-cherry-pick]).
 For example, let's say you just committed "some work" and your `git log` looks
 like this:
 
-```
-* 67aea58 (HEAD -> master) some work
+```console
+* 67aea58 (HEAD -> main) some work
 * 13bea0e test commit for docs.
 ```
 
 You then mistakenly run `git reset --hard 13bea0e`:
 
-```
+```console
 $ git reset --hard 13bea0e
 HEAD is now at 13bea0e test commit for docs.
 
 $ git log
-* 13bea0e (HEAD -> master) test commit for docs.
+* 13bea0e (HEAD -> main) test commit for docs.
 ```
 
-And then realize you actually needed to keep commit 67aea58. First, use `git
-reflog` to confirm that commit you want to restore and then run `git
-cherry-pick <commit>`:
+And then realize you actually needed to keep commit 67aea58. First, use
+`git reflog` to confirm that commit you want to restore and then run
+`git cherry-pick <commit>`:
 
-```
+```console
 $ git reflog
 13bea0e HEAD@{0}: reset: moving to 13bea0e
 67aea58 HEAD@{1}: commit: some work
 
 $ git cherry-pick 67aea58
- [master 67aea58] some work
+ [main 67aea58] some work
  Date: Thu Oct 13 11:51:19 2016 -0700
  1 file changed, 1 insertion(+)
  create mode 100644 test4.txt
@@ -154,13 +153,13 @@ which ever branch you are rebasing on top of, is to code that has been changed
 by those new commits.
 
 For example, while I'm working on a file, another contributor makes a change to
-that file, submits a pull request and has their code merged into master.
+that file, submits a pull request and has their code merged into `main`.
 Usually this is not a problem, but in this case the other contributor made a
 change to a part of the file I also want to change. When I try to bring my
-branch up to date with `git fetch` and then `git rebase upstream/master`, I see
+branch up to date with `git fetch` and then `git rebase upstream/main`, I see
 the following:
 
-```
+```console
 First, rewinding head to replay your work on top of it...
 Applying: test change for docs
 Using index info to reconstruct a base tree...
@@ -178,11 +177,11 @@ To check out the original branch and stop rebasing, run "git rebase --abort".
 ```
 
 This message tells me that Git was not able to apply my changes to README.md
-after bringing in the new commits from upstream/master.
+after bringing in the new commits from upstream/main.
 
 Running `git status` also gives me some information:
 
-```
+```console
 rebase in progress; onto 5ae56e6
 You are currently rebasing branch 'docs-test' on '5ae56e6'.
   (fix conflicts and then run "git rebase --continue")
@@ -204,10 +203,12 @@ and `>>>>>>>`) markers to indicate where in files there are conflicts.
 
 Tip: You can see recent changes made to a file by running the following
 commands:
-```
+
+```bash
 git fetch upstream
-git log -p upstream/master -- /path/to/file
+git log -p upstream/main -- /path/to/file
 ```
+
 You can use this to compare the changes that you have made to a file with the
 ones in upstream, helping you avoid undoing changes from a previous commit when
 you are rebasing.
@@ -215,7 +216,7 @@ you are rebasing.
 Once you've done that, save the file(s), stage them with `git add` and then
 continue the rebase with `git rebase --continue`:
 
-```
+```console
 $ git add README.md
 
 $ git rebase --continue
@@ -234,14 +235,14 @@ pay attention and do a bit of work to ensure all of your work is readily
 available.
 
 Recall that most Git operations are local. When you commit your changes with
-`git commit` they are safely stored in your *local* Git database only. That is,
-until you *push* the commits to GitHub, they are only available on the computer
+`git commit` they are safely stored in your _local_ Git database only. That is,
+until you _push_ the commits to GitHub, they are only available on the computer
 where you committed them.
 
 So, before you stop working for the day, or before you switch computers, push
 all of your commits to GitHub with `git push`:
 
-```
+```console
 $ git push origin <branchname>
 ```
 
@@ -254,7 +255,7 @@ But if you're switching to another computer on which you have already cloned
 Zulip, you need to update your local Git database with new refs from your
 GitHub fork. You do this with `git fetch`:
 
-```
+```console
 $ git fetch <usermame>
 ```
 
@@ -262,11 +263,11 @@ Ideally you should do this before you have made any commits on the same branch
 on the second computer. Then you can `git merge` on whichever branch you need
 to update:
 
-```
+```console
 $ git checkout <my-branch>
 Switched to branch '<my-branch>'
 
-$ git merge origin/master
+$ git merge origin/main
 ```
 
 **If you have already made commits on the second computer that you need to

docs/git/using.md

@@ -8,7 +8,7 @@ determine the currently checked out branch several ways.
 
 One way is with [git status][gitbook-git-status]:
 
-```
+```console
 $ git status
 On branch issue-demo
 nothing to commit, working directory clean
@@ -17,23 +17,23 @@ nothing to commit, working directory clean
 Another is with [git branch][gitbook-git-branch] which will display all local
 branches, with a star next to the current branch:
 
-```
+```console
 $ git branch
 * issue-demo
-  master
+  main
 ```
 
 To see even more information about your branches, including remote branches,
 use `git branch -vva`:
 
-```
+```console
 $ git branch -vva
 * issue-123                 517468b troubleshooting tip about provisioning
-  master                    f0eaee6 [origin/master] bug: Fix traceback in get_missed_message_token_from_address().
-  remotes/origin/HEAD       -> origin/master
+  main                      f0eaee6 [origin/main] bug: Fix traceback in get_missed_message_token_from_address().
+  remotes/origin/HEAD       -> origin/main
   remotes/origin/issue-1234 4aeccb7 Another test commit, with longer message.
-  remotes/origin/master     f0eaee6 bug: Fix traceback in get_missed_message_token_from_address().
-  remotes/upstream/master   dbeab6a Optimize checks of test database state by moving into Python.
+  remotes/origin/main       f0eaee6 bug: Fix traceback in get_missed_message_token_from_address().
+  remotes/upstream/main     dbeab6a Optimize checks of test database state by moving into Python.
 ```
 
 You can also configure [Bash][gitbook-other-envs-bash] and
@@ -46,48 +46,48 @@ from Zulip's main repositories.
 
 **Note about git pull**: You might be used to using `git pull` on other
 projects. With Zulip, because we don't use merge commits, you'll want to avoid
-it. Rather than using `git pull`, which by default is a shortcut for `git fetch
-&& git merge FETCH_HEAD` ([docs][gitbook-git-pull]), you should use `git fetch`
-and then `git rebase`.
+it. Rather than using `git pull`, which by default is a shortcut for
+`git fetch && git merge FETCH_HEAD` ([docs][gitbook-git-pull]), you
+should use `git fetch` and then `git rebase`.
 
 First, [fetch][gitbook-fetch] changes from Zulip's upstream repository you
 configured in the step above:
 
-```
+```console
 $ git fetch upstream
 ```
 
-Next, check out your `master` branch and [rebase][gitbook-git-rebase] it on top
-of `upstream/master`:
+Next, check out your `main` branch and [rebase][gitbook-git-rebase] it on top
+of `upstream/main`:
 
-```
-$ git checkout master
-Switched to branch 'master'
+```console
+$ git checkout main
+Switched to branch 'main'
 
-$ git rebase upstream/master
+$ git rebase upstream/main
 ```
 
-This will rollback any changes you've made to master, update it from
-`upstream/master`, and then re-apply your changes. Rebasing keeps the commit
+This will rollback any changes you've made to `main`, update it from
+`upstream/main`, and then re-apply your changes. Rebasing keeps the commit
 history clean and readable.
 
 When you're ready, [push your changes][github-help-push] to your remote fork.
-Make sure you're in branch `master` and then run `git push`:
+Make sure you're in branch `main` and then run `git push`:
 
-```
-$ git checkout master
-$ git push origin master
+```console
+$ git checkout main
+$ git push origin main
 ```
 
 You can keep any branch up to date using this method. If you're working on a
 feature branch (see next section), which we recommend, you would change the
-command slightly, using the name of your `feature-branch` rather than `master`:
+command slightly, using the name of your `feature-branch` rather than `main`:
 
-```
+```console
 $ git checkout feature-branch
 Switched to branch 'feature-branch'
 
-$ git rebase upstream/master
+$ git rebase upstream/main
 
 $ git push origin feature-branch
 ```
@@ -99,25 +99,25 @@ feature. Recall from [how Git is different][how-git-is-different] that
 **Git is designed for lightweight branching and merging.** You can and should
 create as many branches as you'd like.
 
-First, make sure your master branch is up-to-date with Zulip upstream ([see
+First, make sure your `main` branch is up-to-date with Zulip upstream ([see
 how][zulip-git-guide-up-to-date]).
 
-Next, from your master branch, create a new tracking branch, providing a
+Next, from your `main` branch, create a new tracking branch, providing a
 descriptive name for your feature branch:
 
-```
-$ git checkout master
-Switched to branch 'master'
+```console
+$ git checkout main
+Switched to branch 'main'
 
 $ git checkout -b issue-1755-fail2ban
 Switched to a new branch 'issue-1755-fail2ban'
 ```
 
 Alternatively, you can create a new branch explicitly based off
-`upstream/master`:
+`upstream/main`:
 
-```
-$ git checkout -b issue-1755-fail2ban upstream/master
+```console
+$ git checkout -b issue-1755-fail2ban upstream/main
 Switched to a new branch 'issue-1755-fail2ban'
 ```
 
@@ -135,7 +135,7 @@ Recall that files tracked with Git have possible three states:
 committed, modified, and staged.
 
 To prepare a commit, first add the files with changes that you want
-to include in your commit to your staging area. You *add* both new files and
+to include in your commit to your staging area. You _add_ both new files and
 existing ones. You can also remove files from staging when necessary.
 
 ### Get status of working directory
@@ -146,7 +146,7 @@ staged, use `git status`.
 If you have no changes in the working directory, you'll see something like
 this:
 
-```
+```console
 $ git status
 On branch issue-123
 nothing to commit, working directory clean
@@ -154,7 +154,7 @@ nothing to commit, working directory clean
 
 If you have unstaged changes, you'll see something like this:
 
-```
+```console
 On branch issue-123
 Untracked files:
   (use "git add <file>..." to include in what will be committed)
@@ -166,14 +166,15 @@ nothing added to commit but untracked files present (use "git add" to track)
 
 ### Stage additions with git add
 
-To add changes to your staging area, use `git add <filename>`. Because `git
-add` is all about staging the changes you want to commit, you use it to add
-*new files* as well as *files with changes* to your staging area.
+To add changes to your staging area, use `git add <filename>`. Because
+`git add` is all about staging the changes you want to commit, you use
+it to add _new files_ as well as _files with changes_ to your staging
+area.
 
 Continuing our example from above, after we run `git add newfile.py`, we'll see
 the following from `git status`:
 
-```
+```console
 On branch issue-123
 Changes to be committed:
   (use "git reset HEAD <file>..." to unstage)
@@ -187,13 +188,12 @@ view changes to files you haven't yet staged, just use `git diff`.
 If you want to add all changes in the working directory, use `git add -A`
 ([documentation][gitbook-add]).
 
-
 You can also stage changes using your graphical Git client.
 
 If you stage a file, you can undo it with `git reset HEAD <filename>`. Here's
 an example where we stage a file `test3.txt` and then unstage it:
 
-```
+```console
 $ git add test3.txt
 On branch issue-1234
 Changes to be committed:
@@ -222,7 +222,7 @@ stage the file for deletion and leave it in your working directory.
 To stage a file for deletion and **remove** it from your working directory, use
 `git rm <filename>`:
 
-```
+```console
 $ git rm test.txt
 rm 'test.txt'
 
@@ -240,7 +240,7 @@ ls: No such file or directory
 To stage a file for deletion and **keep** it in your working directory, use
 `git rm --cached <filename>`:
 
-```
+```console
 $ git rm --cached test2.txt
 rm 'test2.txt'
 
@@ -258,7 +258,7 @@ test2.txt
 If you stage a file for deletion with the `--cached` option, and haven't yet
 run `git commit`, you can undo it with `git reset HEAD <filename>`:
 
-```
+```console
 $ git reset HEAD test2.txt
 ```
 
@@ -273,7 +273,7 @@ with `git commit -m "My commit message."` to include a commit message.
 
 Here's an example of committing with the `-m` for a one-line commit message:
 
-```
+```console
 $ git commit -m "Add a test commit for docs."
 [issue-123 173e17a] Add a test commit for docs.
  1 file changed, 1 insertion(+)
@@ -295,7 +295,7 @@ messages][zulip-rtd-commit-messages] for details.
 
 Here's an example of a longer commit message that will be used for a pull request:
 
-```
+```text
 Integrate Fail2Ban.
 
 Updates Zulip logging to put an unambiguous entry into the logs such
@@ -317,13 +317,13 @@ testing in a more production-like environment.
 
 The final paragraph indicates that this commit addresses and fixes issue #1755.
 When you submit your pull request, GitHub will detect and link this reference
-to the appropriate issue. Once your commit is merged into zulip/master, GitHub
+to the appropriate issue. Once your commit is merged into `upstream/main`, GitHub
 will automatically close the referenced issue. See [Closing issues via commit
 messages][github-help-closing-issues] for details.
 
 Note in particular that GitHub's regular expressions for this feature
 are sloppy, so phrases like `Partially fixes #1234` will automatically
-close the issue.  Phrases like `Fixes part of #1234` are a good
+close the issue. Phrases like `Fixes part of #1234` are a good
 alternative.
 
 Make as many commits as you need to to address the issue or implement your feature.
@@ -335,9 +335,9 @@ This ensures your work is backed up should something happen to your local
 machine and allows others to follow your progress. It also allows you to
 [work from multiple computers][self-multiple-computers] without losing work.
 
-Pushing to a feature branch is just like pushing to master:
+Pushing to a feature branch is just like pushing to `main`:
 
-```
+```console
 $ git push origin <branch-name>
 Counting objects: 6, done.
 Delta compression using up to 4 threads.
@@ -367,7 +367,7 @@ your commit history be able to clearly understand your progression of work?
 On the command line, you can use the `git log` command to display an easy to
 read list of your commits:
 
-```
+```console
 $ git log --all --graph --oneline --decorate
 
 * 4f8d75d (HEAD -> 1754-docs-add-git-workflow) docs: Add details about configuring Travis CI.
@@ -376,7 +376,7 @@ $ git log --all --graph --oneline --decorate
 * 985116b docs: Add graphic client recs to Git Guide.
 * 3c40103 docs: Add stubs for remaining Git Guide sections.
 * fc2c01e docs: Add git guide quickstart.
-| * f0eaee6 (upstream/master) bug: Fix traceback in get_missed_message_token_from_address().
+| * f0eaee6 (upstream/main) bug: Fix traceback in get_missed_message_token_from_address().
 ```
 
 Alternatively, use your graphical client to view the history for your feature branch.
@@ -404,7 +404,7 @@ Any time you alter history for commits you have already pushed to GitHub,
 you'll need to prefix the name of your branch with a `+`. Without this, your
 updates will be rejected with a message such as:
 
-```
+```console
 $ git push origin 1754-docs-add-git-workflow
 To git@github.com:christi3k/zulip.git
  ! [rejected] 1754-docs-add-git-workflow -> 1754-docs-add-git-workflow (non-fast-forward)
@@ -413,13 +413,12 @@ hint: Updates were rejected because the tip of your current branch is behind
 hint: its remote counterpart. Integrate the remote changes (e.g.
 hint: 'git pull ...') before pushing again.
 hint: See the 'Note about fast-forwards' in 'git push --help' for details.
-
 ```
 
 Re-running the command with `+<branch>` allows the push to continue by
 re-writing the history for the remote repository:
 
-```
+```console
 $ git push origin +1754-docs-add-git-workflow
 Counting objects: 12, done.
 Delta compression using up to 4 threads.
@@ -429,7 +428,6 @@ Total 12 (delta 8), reused 0 (delta 0)
 remote: Resolving deltas: 100% (8/8), completed with 2 local objects.
 To git@github.com:christi3k/zulip.git
  + 2d49e2d...bfb2433 1754-docs-add-git-workflow -> 1754-docs-add-git-workflow (forced update)
-
 ```
 
 This is perfectly okay to do on your own feature branches, especially if you're

docs/git/working-copies.md

@@ -3,8 +3,8 @@
 When you work on Zulip code, there are three copies of the Zulip Git
 repository that you are generally concerned with:
 
-- The `upstream` remote.  This is the [official Zulip
-  repository](https://github.com/zulip/zulip) on GitHub.  You probably
+- The `upstream` remote. This is the [official Zulip
+  repository](https://github.com/zulip/zulip) on GitHub. You probably
   don't have write access to this repository.
 - The **origin** remote: Your personal remote repository on GitHub.
   You'll use this to share your code and create [pull requests](../git/pull-requests.md).
@@ -31,7 +31,7 @@ Sometimes you want to publish commits. Here are some scenarios:
 Finally, the Zulip core team will occasionally want your changes!
 
 - The Zulip core team can accept your changes and add them to
-  the official repo, usually on the master branch.
+  the official repo, usually on the `main` branch.
 
 ## Relevant Git commands
 
@@ -44,7 +44,7 @@ working copies:
 - `git push`: This pushes code from your local repository to one of the remotes.
 - `git remote`: This helps you configure short names for remotes.
 - `git pull`: This pulls code, but by default creates a merge commit
-  (which you definitely don't want).  However, if you've followed our
-  [cloning documentation](../git/cloning.md), this will do `git pull
-  --rebase` instead, which is the only mode you'll want to use when
-  working on Zulip.
+  (which you definitely don't want). However, if you've followed our
+  [cloning documentation](../git/cloning.md), this will do
+  `git pull --rebase` instead, which is the only mode you'll want to
+  use when working on Zulip.

docs/git/zulip-tools.md

@@ -5,7 +5,7 @@ time when working with Git on the Zulip project.
 
 ## Set up Git repo script
 
-**Extremely useful**.  In the `tools` directory of
+**Extremely useful**. In the `tools` directory of
 [zulip/zulip][github-zulip-zulip] you'll find a bash script
 `setup-git-repo`. This script installs a pre-commit hook, which will
 run each time you `git commit` to automatically run
@@ -16,7 +16,7 @@ notices or warnings it displays.
 
 It's simple to use. Make sure you're in the clone of zulip and run the following:
 
-```
+```console
 $ ./tools/setup-git-repo
 ```
 
@@ -24,7 +24,7 @@ The script doesn't produce any output if successful. To check that the hook has
 been installed, print a directory listing for `.git/hooks` and you should see
 something similar to:
 
-```
+```console
 $ ls -l .git/hooks
 pre-commit -> ../../tools/pre-commit
 ```
@@ -41,16 +41,16 @@ described above in that it does not create a branch for the pull request
 checkout.
 
 **This tool checks for uncommitted changes, but it will move the
-  current branch using `git reset --hard`.  Use with caution.**
+current branch using `git reset --hard`. Use with caution.**
 
 First, make sure you are working in a branch you want to move (in this
-example, we'll use the local `master` branch). Then run the script
+example, we'll use the local `main` branch). Then run the script
 with the ID number of the pull request as the first argument.
 
-```
-$ git checkout master
-Switched to branch 'master'
-Your branch is up-to-date with 'origin/master'.
+```console
+$ git checkout main
+Switched to branch 'main'
+Your branch is up-to-date with 'origin/main'.
 
 $ ./tools/reset-to-pull-request 1900
 + request_id=1900
@@ -70,11 +70,11 @@ HEAD is now at 2bcd1d8 troubleshooting tip about provisioning
 
 `tools/fetch-rebase-pull-request` is a short-cut for [checking out a pull
 request locally][zulip-git-guide-fetch-pr] in its own branch and then updating it with any
-changes from upstream/master with `git rebase`.
+changes from `upstream/main` with `git rebase`.
 
 Run the script with the ID number of the pull request as the first argument.
 
-```
+```console
 $ tools/fetch-rebase-pull-request 1913
 + request_id=1913
 + git fetch upstream pull/1913/head
@@ -84,8 +84,8 @@ remote: Total 4 (delta 0), reused 0 (delta 0), pack-reused 0
 Unpacking objects: 100% (4/4), done.
 From https://github.com/zulip/zulip
  * branch            refs/pull/1913/head -> FETCH_HEAD
-+ git checkout upstream/master -b review-1913
-Branch review-1913 set up to track remote branch master from upstream.
++ git checkout upstream/main -b review-1913
+Branch review-1913 set up to track remote branch main from upstream.
 Switched to a new branch 'review-1913'
 + git reset --hard FETCH_HEAD
 HEAD is now at 99aa2bf Add provision.py fails issue in common errors
@@ -96,12 +96,12 @@ Current branch review-1913 is up to date.
 ## Fetch a pull request without rebasing
 
 `tools/fetch-pull-request` is a similar to `tools/fetch-rebase-pull-request`, but
-it does not rebase the pull request against upstream/master, thereby getting
+it does not rebase the pull request against `upstream/main`, thereby getting
 exactly the same repository state as the commit author had.
 
 Run the script with the ID number of the pull request as the first argument.
 
-```
+```console
 $ tools/fetch-pull-request 5156
 + git diff-index --quiet HEAD
 + request_id=5156
@@ -118,18 +118,18 @@ HEAD is now at 5a1e982 tools: Update clean-branches to clean review branches.
 ## Push to a pull request
 
 `tools/push-to-pull-request` is primarily useful for maintainers who
-are merging other users' commits into a Zulip repository.  After doing
+are merging other users' commits into a Zulip repository. After doing
 `reset-to-pull-request` or `fetch-pull-request` and making some
 changes, you can push a branch back to a pull request with e.g.
-`tools/push-to-pull-request 1234`.  This is useful for a few things:
+`tools/push-to-pull-request 1234`. This is useful for a few things:
 
-* Getting CI to run and enabling you to use the GitHub "Merge" buttons
+- Getting CI to run and enabling you to use the GitHub "Merge" buttons
   to merge a PR after you make some corrections to a PR, without
   waiting for an extra round trip with the PR author.
-* For commits that aren't ready to merge yet, communicating clearly
+- For commits that aren't ready to merge yet, communicating clearly
   any changes you'd like to see happen that are easier for you to
   explain by just editing the code than in words.
-* Saving a contributor from needing to duplicate any rebase work that
+- Saving a contributor from needing to duplicate any rebase work that
   you did as part of integrating parts of the PR.
 
 You'll likely want to comment on the PR after doing so, to ensure that
@@ -139,23 +139,23 @@ next batch of changes.
 
 Note that in order to do this you need permission to do such a push,
 which GitHub offers by default to users with write access to the
-repository.  For multiple developers collaborating on a PR, you can
+repository. For multiple developers collaborating on a PR, you can
 achieve this by granting other users permission to write to your fork.
 
 ## Delete unimportant branches
 
 `tools/clean-branches` is a shell script that removes branches that are either:
 
-1. Local branches that are ancestors of origin/master.
-2. Branches in origin that are ancestors of origin/master and named like `$USER-*`.
+1. Local branches that are ancestors of `origin/main`.
+2. Branches in origin that are ancestors of `origin/main` and named like `$USER-*`.
 3. Review branches created by `tools/fetch-rebase-pull-request` and `tools/fetch-pull-request`.
 
-First, make sure you are working in branch `master`. Then run the script without any
+First, make sure you are working in branch `main`. Then run the script without any
 arguments for default behavior. Since removing review branches can inadvertently remove any
 feature branches whose names are like `review-*`, it is not done by default. To
 use it, run `tools/clean-branches --reviews`.
 
-```
+```console
 $ tools/clean-branches --reviews
 Deleting local branch review-original-5156 (was 5a1e982)
 ```
@@ -163,12 +163,13 @@ Deleting local branch review-original-5156 (was 5a1e982)
 ## Merge conflict on yarn.lock file
 
 If there is a merge conflict on yarn.lock, yarn should be run to
-regenerate the file. *Important* don't delete the yarn.lock file. Check out the
-latest one from origin/master so that yarn knows the previous asset versions.
+regenerate the file. _Important_ don't delete the yarn.lock file. Check out the
+latest one from `origin/main` so that yarn knows the previous asset versions.
 
 Run the following commands
-```
-git checkout origin/master -- yarn.lock
+
+```bash
+git checkout origin/main -- yarn.lock
 yarn install
 git add yarn.lock
 git rebase --continue

docs/overview/architecture-overview.md

@@ -1,10 +1,8 @@
-Zulip architectural overview
-============================
+# Zulip architectural overview
 
-Key codebases
--------------
+## Key codebases
 
-The main Zulip codebase is at <https://github.com/zulip/zulip>.  It
+The main Zulip codebase is at <https://github.com/zulip/zulip>. It
 contains the Zulip backend (written in Python 3.x and Django), the
 webapp (written in JavaScript and TypeScript) and our library of
 incoming webhook [integrations](https://zulip.com/integrations)
@@ -37,22 +35,21 @@ translations.
 In this overview, we'll mainly discuss the core Zulip server and web
 application.
 
-Usage assumptions and concepts
-------------------------------
+## Usage assumptions and concepts
 
 Zulip is a real-time team chat application meant to provide a great
 experience for a wide range of organizations, from companies to
 volunteer projects to groups of friends, ranging in size from a small
-team to 10,000s of users.  It has [hundreds of
+team to 10,000s of users. It has [hundreds of
 features](https://zulip.com/features) both larger and small, and
 supports dedicated apps for iOS, Android, Linux, Windows, and macOS,
 all modern web browsers, several cross-protocol chat clients, and
 numerous dedicated [Zulip API](https://zulip.com/api) clients
 (e.g. bots).
 
-A server can host multiple Zulip *realms* (organizations), each on its
-own (sub)domain.  While most installations host only one organization, some
-such as zulip.com host thousands.  Each organization is a private
+A server can host multiple Zulip _realms_ (organizations), each on its
+own (sub)domain. While most installations host only one organization, some
+such as zulip.com host thousands. Each organization is a private
 chamber with its own users, streams, customizations, and so on. This
 means that one person might be a user of multiple Zulip realms. The
 administrators of an organization have a great deal of control over
@@ -61,15 +58,14 @@ more on security considerations and options, see [the security model
 section](../production/security-model.md) and the [Zulip Help
 Center](https://zulip.com/help).
 
-Components
-----------
+## Components
 
-  ![architecture-simple](../images/architecture_simple.png)
+![architecture-simple](../images/architecture_simple.png)
 
 ### Django and Tornado
 
 Zulip is primarily implemented in the
-[Django](https://www.djangoproject.com/) Python web framework.  We
+[Django](https://www.djangoproject.com/) Python web framework. We
 also make use of [Tornado](https://www.tornadoweb.org) for the
 real-time push system.
 
@@ -86,10 +82,10 @@ connection from every running client. For this reason, it's
 responsible for event (message) delivery, but not much else. We try to
 avoid any blocking calls in Tornado because we don't want to delay
 delivery to thousands of other connections (as this would make Zulip
-very much not real-time).  For instance, we avoid doing cache or
+very much not real-time). For instance, we avoid doing cache or
 database queries inside the Tornado code paths, since those blocking
 requests carry a very high performance penalty for a single-threaded,
-asynchronous server system.  (In principle, we could do non-blocking
+asynchronous server system. (In principle, we could do non-blocking
 requests to those services, but the Django-based database libraries we
 use in most of our codebase using don't support that, and in any case,
 our architecture doesn't require Tornado to do that).
@@ -116,8 +112,8 @@ For more details on the frontend, see our documentation on
 [directory structure](../overview/directory-structure.md), and
 [the static asset pipeline](../subsystems/html-css.html#static-asset-pipeline).
 
-[Jinja2]: http://jinja.pocoo.org/
-[Handlebars]: https://handlebarsjs.com/
+[jinja2]: http://jinja.pocoo.org/
+[handlebars]: https://handlebarsjs.com/
 
 ### nginx
 
@@ -130,19 +126,19 @@ according to the rules laid down in the many config files found in
 important of these files. It explains what happens when requests come in
 from outside.
 
--   In production, all requests to URLs beginning with `/static/` are
-    served from the corresponding files in `/home/zulip/prod-static/`,
-    and the production build process (`tools/build-release-tarball`)
-    compiles, minifies, and installs the static assets into the
-    `prod-static/` tree form. In development, files are served directly
-    from `/static/` in the Git repository.
--   Requests to `/json/events` and `/api/v1/events`, i.e. the
-    real-time push system, are sent to the Tornado server.
--   Requests to all other paths are sent to the Django app running via
-    `uWSGI` via `unix:/home/zulip/deployments/uwsgi-socket`.
+- In production, all requests to URLs beginning with `/static/` are
+  served from the corresponding files in `/home/zulip/prod-static/`,
+  and the production build process (`tools/build-release-tarball`)
+  compiles, minifies, and installs the static assets into the
+  `prod-static/` tree form. In development, files are served directly
+  from `/static/` in the Git repository.
+- Requests to `/json/events` and `/api/v1/events`, i.e. the
+  real-time push system, are sent to the Tornado server.
+- Requests to all other paths are sent to the Django app running via
+  `uWSGI` via `unix:/home/zulip/deployments/uwsgi-socket`.
 - By default (i.e. if `LOCAL_UPLOADS_DIR` is set), nginx will serve
   user-uploaded content like avatars, custom emoji, and uploaded
-  files.  However, one can configure Zulip to store these in a cloud
+  files. However, one can configure Zulip to store these in a cloud
   storage service like Amazon S3 instead.
 
 Note that we do not use `nginx` in the development environment, opting
@@ -168,7 +164,7 @@ memcached is used to cache database model
 objects. `zerver/lib/cache.py` and `zerver/lib/cache_helpers.py`
 manage putting things into memcached, and invalidating the cache when
 values change. The memcached configuration is in
-`puppet/zulip/files/memcached.conf`.  See our
+`puppet/zulip/files/memcached.conf`. See our
 [caching guide](../subsystems/caching.md) to learn how this works in
 detail.
 
@@ -181,25 +177,27 @@ Redis is configured in `zulip/puppet/zulip/files/redis` and it's a
 pretty standard configuration except for the last line, which turns off
 persistence:
 
-    # Zulip-specific configuration: disable saving to disk.
-    save ""
+```text
+# Zulip-specific configuration: disable saving to disk.
+save ""
+```
 
 People often wonder if we could replace memcached with Redis (or
 replace RabbitMQ with Redis, with some loss of functionality).
 
 The answer is likely yes, but it wouldn't improve Zulip.
 Operationally, our current setup is likely easier to develop and run
-in production than a pure Redis system would be.  Meanwhile, the
+in production than a pure Redis system would be. Meanwhile, the
 perceived benefit for using Redis is usually to reduce memory
 consumption by running fewer services, and no such benefit would
 materialize:
 
-* Our cache uses significant memory, but that memory usage would be
+- Our cache uses significant memory, but that memory usage would be
   essentially the same with Redis as it is with memcached.
-* All of these services have low minimum memory requirements, and in
+- All of these services have low minimum memory requirements, and in
   fact our applications for Redis and RabbitMQ do not use significant
   memory even at scale.
-* We would likely need to run multiple Redis services (with different
+- We would likely need to run multiple Redis services (with different
   configurations) in order to ensure the pure LRU use case (memcached)
   doesn't push out data that we want to persist until expiry
   (Redis-based rate limiting) or until consumed (RabbitMQ-based
@@ -219,7 +217,7 @@ and the Tornado push system.
 
 Two simple wrappers around `pika` (the Python RabbitMQ client) are in
 `zulip/zerver/lib/queue.py`. There's an asynchronous client for use in
-Tornado and a more general client for use elsewhere.  Most of the
+Tornado and a more general client for use elsewhere. Most of the
 processes started by Supervisor are queue processors that continually
 pull things out of a RabbitMQ queue and handle them; they are defined
 in `zerver/worker/queue_processors.py`.
@@ -241,7 +239,7 @@ list of stopwords used by a PostgreSQL extension.
 
 In a development environment, configuration of that PostgreSQL
 extension is handled by `tools/postgresql-init-dev-db` (invoked by
-`tools/provision`).  That file also manages setting up the
+`tools/provision`). That file also manages setting up the
 development PostgreSQL user.
 
 `tools/provision` also invokes `tools/rebuild-dev-database`
@@ -265,53 +263,53 @@ component of the Zulip server (e.g.
 ## Glossary
 
 This section gives names for some of the elements in the Zulip UI used
-in Zulip development conversations.  In general, our goal is to
+in Zulip development conversations. In general, our goal is to
 minimize the set of terminology listed here by giving elements
 self-explanatory names.
 
-* **bankruptcy**: When a user has been off Zulip for several days and
-    has hundreds of unread messages, they are prompted for whether
-    they want to mark all their unread messages as read.  This is
-    called "declaring bankruptcy" (in reference to the concept in
-    finance).
+- **bankruptcy**: When a user has been off Zulip for several days and
+  has hundreds of unread messages, they are prompted for whether
+  they want to mark all their unread messages as read. This is
+  called "declaring bankruptcy" (in reference to the concept in
+  finance).
 
-* **chevron**: A small downward-facing arrow next to a message's
-    timestamp, offering contextual options, e.g., "Reply", "Mute [this
-    topic]", or "Link to this conversation". To avoid visual clutter,
-    the chevron only appears in the web UI upon hover.
+- **chevron**: A small downward-facing arrow next to a message's
+  timestamp, offering contextual options, e.g., "Reply", "Mute [this
+  topic]", or "Link to this conversation". To avoid visual clutter,
+  the chevron only appears in the web UI upon hover.
 
-* **ellipsis**: A small vertical three dot icon (technically called
-    as ellipsis-v), present in sidebars as a menu icon.
-    It offers contextual options for global filters (All messages
-    and Starred messages), stream filters and topics in left
-    sidebar and users in right sidebar. To avoid visual clutter
-    ellipsis only appears in the web UI upon hover.
+- **ellipsis**: A small vertical three dot icon (technically called
+  as ellipsis-v), present in sidebars as a menu icon.
+  It offers contextual options for global filters (All messages
+  and Starred messages), stream filters and topics in left
+  sidebar and users in right sidebar. To avoid visual clutter
+  ellipsis only appears in the web UI upon hover.
 
-* **huddle**: What the codebase calls a "group private message".
+- **huddle**: What the codebase calls a "group private message".
 
-* **message editing**: If the realm admin allows it, then after a user
-    posts a message, the user has a few minutes to click "Edit" and
-    change the content of their message. If they do, Zulip adds a
-    marker such as "(EDITED)" at the top of the message, visible to
-    anyone who can see the message.
+- **message editing**: If the realm admin allows it, then after a user
+  posts a message, the user has a few minutes to click "Edit" and
+  change the content of their message. If they do, Zulip adds a
+  marker such as "(EDITED)" at the top of the message, visible to
+  anyone who can see the message.
 
-* **realm**: What the codebase calls an "organization" in the UI.
+- **realm**: What the codebase calls an "organization" in the UI.
 
-* **recipient bar**: A visual indication of the context of a message
-    or group of messages, displaying the stream and topic or private
-    message recipient list, at the top of a group of messages. A
-    typical 1-line message to a new recipient shows to the user as
-    three lines of content: first the recipient bar, second the
-    sender's name and avatar alongside the timestamp (and, on hover,
-    the star and the chevron), and third the message content. The
-    recipient bar is or contains hyperlinks to help the user narrow.
+- **recipient bar**: A visual indication of the context of a message
+  or group of messages, displaying the stream and topic or private
+  message recipient list, at the top of a group of messages. A
+  typical 1-line message to a new recipient shows to the user as
+  three lines of content: first the recipient bar, second the
+  sender's name and avatar alongside the timestamp (and, on hover,
+  the star and the chevron), and third the message content. The
+  recipient bar is or contains hyperlinks to help the user narrow.
 
-* **star**: Zulip allows a user to mark any message they can see,
-    public or private, as "starred". A user can easily access messages
-    they've starred through the "Starred messages" link in the
-    left sidebar, or use "is:starred" as a narrow or a search
-    constraint. Whether a user has or has not starred a particular
-    message is private; other users and realm admins don't know
-    whether a message has been starred, or by whom.
+- **star**: Zulip allows a user to mark any message they can see,
+  public or private, as "starred". A user can easily access messages
+  they've starred through the "Starred messages" link in the
+  left sidebar, or use "is:starred" as a narrow or a search
+  constraint. Whether a user has or has not starred a particular
+  message is private; other users and realm admins don't know
+  whether a message has been starred, or by whom.
 
-* **subject**: What the codebase calls a "topic" in many places.
+- **subject**: What the codebase calls a "topic" in many places.

docs/overview/directory-structure.md

@@ -13,173 +13,172 @@ Zulip uses the [Django web
 framework](https://docs.djangoproject.com/en/1.8/), so a lot of these
 paths will be familiar to Django developers.
 
-* `zproject/urls.py` Main
+- `zproject/urls.py` Main
   [Django routes file](https://docs.djangoproject.com/en/1.8/topics/http/urls/).
   Defines which URLs are handled by which view functions or templates.
 
-* `zerver/models.py` Main
+- `zerver/models.py` Main
   [Django models](https://docs.djangoproject.com/en/1.8/topics/db/models/)
-  file.  Defines Zulip's database tables.
+  file. Defines Zulip's database tables.
 
-* `zerver/lib/*.py` Most library code.
+- `zerver/lib/*.py` Most library code.
 
-* `zerver/lib/actions.py` Most code doing writes to user-facing
-  database tables lives here.  In particular, we have a policy that
+- `zerver/lib/actions.py` Most code doing writes to user-facing
+  database tables lives here. In particular, we have a policy that
   all code calling `send_event` to trigger [pushing data to
   clients](../subsystems/events-system.md) must live here.
 
-* `zerver/views/*.py` Most [Django views](https://docs.djangoproject.com/en/1.8/topics/http/views/).
+- `zerver/views/*.py` Most [Django views](https://docs.djangoproject.com/en/1.8/topics/http/views/).
 
-* `zerver/webhooks/` Webhook views and tests for [Zulip's incoming webhook integrations](
-  https://zulip.com/api/incoming-webhooks-overview).
+- `zerver/webhooks/` Webhook views and tests for [Zulip's incoming webhook integrations](https://zulip.com/api/incoming-webhooks-overview).
 
-* `zerver/tornado/views.py` Tornado views.
+- `zerver/tornado/views.py` Tornado views.
 
-* `zerver/worker/queue_processors.py` [Queue workers](../subsystems/queuing.md).
+- `zerver/worker/queue_processors.py` [Queue workers](../subsystems/queuing.md).
 
-* `zerver/lib/markdown/` [Backend Markdown processor](../subsystems/markdown.md).
+- `zerver/lib/markdown/` [Backend Markdown processor](../subsystems/markdown.md).
 
-* `zproject/backends.py` [Authentication backends](https://docs.djangoproject.com/en/1.8/topics/auth/customizing/).
+- `zproject/backends.py` [Authentication backends](https://docs.djangoproject.com/en/1.8/topics/auth/customizing/).
 
--------------------------------------------------------------------
+---
 
 ### HTML templates
 
 See [our docs](../subsystems/html-css.md) for details on Zulip's
 templating systems.
 
-* `templates/zerver/` For [Jinja2](http://jinja.pocoo.org/) templates
+- `templates/zerver/` For [Jinja2](http://jinja.pocoo.org/) templates
   for the backend (for zerver app; logged-in content is in `templates/zerver/app`).
 
-* `static/templates/` [Handlebars](https://handlebarsjs.com/) templates for the frontend.
+- `static/templates/` [Handlebars](https://handlebarsjs.com/) templates for the frontend.
 
-----------------------------------------
+---
 
 ### JavaScript, TypeScript, and other static assets
 
-* `static/js/` Zulip's own JavaScript and TypeScript sources.
+- `static/js/` Zulip's own JavaScript and TypeScript sources.
 
-* `static/styles/` Zulip's own CSS.
+- `static/styles/` Zulip's own CSS.
 
-* `static/images/` Zulip's images.
+- `static/images/` Zulip's images.
 
-* `static/third/` Third-party JavaScript and CSS that has been vendored.
+- `static/third/` Third-party JavaScript and CSS that has been vendored.
 
-* `node_modules/` Third-party JavaScript installed via `yarn`.
+- `node_modules/` Third-party JavaScript installed via `yarn`.
 
-* `static/assets/` For assets not to be served to the web (e.g. the system to
-                   generate our favicons).
+- `static/assets/` For assets not to be served to the web (e.g. the system to
+  generate our favicons).
 
------------------------------------------------------------------------
+---
 
 ### Tests
 
-* `zerver/tests/` Backend tests.
+- `zerver/tests/` Backend tests.
 
-* `frontend_tests/node_tests/` Node Frontend unit tests.
+- `frontend_tests/node_tests/` Node Frontend unit tests.
 
-* `frontend_tests/puppeteer_tests/` Puppeteer frontend integration tests.
+- `frontend_tests/puppeteer_tests/` Puppeteer frontend integration tests.
 
-* `tools/test-*` Developer-facing test runner scripts.
+- `tools/test-*` Developer-facing test runner scripts.
 
------------------------------------------------------
+---
 
 ### Management commands
 
 These are distinguished from scripts, below, by needing to run a
 Django context (i.e. with database access).
 
-* `zerver/management/commands/`
+- `zerver/management/commands/`
   [Management commands](../subsystems/management-commands.md) one might run at a
   production deployment site (e.g. scripts to change a value or
   deactivate a user properly).
 
-* `zilencer/management/commands/` includes some dev-specific
-   commands such as `populate_db`, which are not included in
-   the production distribution.
+- `zilencer/management/commands/` includes some dev-specific
+  commands such as `populate_db`, which are not included in
+  the production distribution.
 
----------------------------------------------------------------
+---
 
 ### Scripts
 
-* `scripts/` Scripts that production deployments might run manually
+- `scripts/` Scripts that production deployments might run manually
   (e.g., `restart-server`).
 
-* `scripts/lib/` Scripts that are needed on production deployments but
+- `scripts/lib/` Scripts that are needed on production deployments but
   humans should never run directly.
 
-* `scripts/setup/` Scripts that production deployments will only run
+- `scripts/setup/` Scripts that production deployments will only run
   once, during installation.
 
-* `tools/` Scripts used only in a Zulip development environment.
+- `tools/` Scripts used only in a Zulip development environment.
   These are not included in production release tarballs for Zulip, so
   that we can include scripts here one wouldn't want someone to run in
   production accidentally (e.g. things that delete the Zulip database
   without prompting).
 
-* `tools/setup/` Subdirectory of `tools/` for things only used during
+- `tools/setup/` Subdirectory of `tools/` for things only used during
   the development environment setup process.
 
-* `tools/ci/` Subdirectory of `tools/` for things only used to
-  set up and run our tests in CI.  Actual test suites should
+- `tools/ci/` Subdirectory of `tools/` for things only used to
+  set up and run our tests in CI. Actual test suites should
   go in `tools/`.
 
----------------------------------------------------------
+---
 
 ### API and bots
 
-* See the [Zulip API repository](https://github.com/zulip/python-zulip-api).
+- See the [Zulip API repository](https://github.com/zulip/python-zulip-api).
   Zulip's Python API bindings, a number of Zulip integrations and
   bots, and a framework for running and testing Zulip bots, used to be
   developed in the main Zulip server repo but are now in their own repo.
 
-* `templates/zerver/integrations/` (within `templates/zerver/`, above).
+- `templates/zerver/integrations/` (within `templates/zerver/`, above).
   Documentation for these integrations.
 
--------------------------------------------------------------------------
+---
 
 ### Production Puppet configuration
 
 This is used to deploy essentially all configuration in production.
 
-* `puppet/zulip/` For configuration for production deployments.
+- `puppet/zulip/` For configuration for production deployments.
 
-* `puppet/zulip/manifests/profile/standalone.pp` Main manifest for Zulip standalone deployments.
+- `puppet/zulip/manifests/profile/standalone.pp` Main manifest for Zulip standalone deployments.
 
------------------------------------------------------------------------
+---
 
 ### Additional Django apps
 
-* `confirmation` Email confirmation system.
+- `confirmation` Email confirmation system.
 
-* `analytics` Analytics for the Zulip server administrator (needs work to
+- `analytics` Analytics for the Zulip server administrator (needs work to
   be useful to normal Zulip sites).
 
-* `corporate` The old Zulip.com website.  Not included in production
+- `corporate` The old Zulip.com website. Not included in production
   distribution.
 
-* `zilencer` Primarily used to hold management commands that aren't
-  used in production.  Not included in production distribution.
+- `zilencer` Primarily used to hold management commands that aren't
+  used in production. Not included in production distribution.
 
------------------------------------------------------------------------
+---
 
 ### Jinja2 compatibility files
 
-* `zproject/jinja2/__init__.py` Jinja2 environment.
+- `zproject/jinja2/__init__.py` Jinja2 environment.
 
------------------------------------------------------------------------
+---
 
 ### Translation files
 
-* `locale/` Backend (Django) and frontend translation data files.
+- `locale/` Backend (Django) and frontend translation data files.
 
------------------------------------------------------------------------
+---
 
 ### Documentation
 
-*  `docs/`        Source for this documentation.
+- `docs/` Source for this documentation.
 
---------------------------------------------------------------
+---
 
 You can consult the repository's `.gitattributes` file to see exactly
 which components are excluded from production releases (release

docs/overview/release-lifecycle.md

@@ -4,20 +4,20 @@ This page details the release lifecycle for the Zulip server and
 client-apps, well as our policies around backwards-compatibility and
 security support policies. In short:
 
-* We recommend always running the latest releases of the Zulip clients
+- We recommend always running the latest releases of the Zulip clients
   and servers. Server upgrades are designed to Just Work; mobile and
   desktop client apps update automatically.
-* The server and client apps are backwards and forwards compatible
+- The server and client apps are backwards and forwards compatible
   across a wide range of versions. So while it's important to upgrade
   the server to get security updates, bug fixes, and new features, the
   mobile and desktop apps will continue working for at least 18 months
   if you don't do so.
-* New server releases are announced via the low-traffic
+- New server releases are announced via the low-traffic
   [zulip-announce email
   list](https://groups.google.com/forum/#!forum/zulip-announce). We
   highly recommend subscribing so that you are notified about new
   security releases.
-* Zulip Cloud runs the branch that will become the next major
+- Zulip Cloud runs the branch that will become the next major
   server/webapp release, so it is always "newer" than the latest
   stable release.
 
@@ -28,16 +28,16 @@ server repository][zulip-server].
 
 ### Stable releases
 
-* Zulip Server **stable releases**, such as Zulip 4.5.
+- Zulip Server **stable releases**, such as Zulip 4.5.
   Organizations self-hosting Zulip primarily use stable releases.
-* The numbering scheme is simple: the first digit indicates the major
-  release series (which we'll refer to as "4.x").  (Before Zulip 3.0,
+- The numbering scheme is simple: the first digit indicates the major
+  release series (which we'll refer to as "4.x"). (Before Zulip 3.0,
   Zulip versions had another digit, e.g. 1.9.2 was a bug fix release
   in the Zulip 1.9.x major release series).
-* [New major releases][blog-major-releases], like Zulip 4.0, are
+- [New major releases][blog-major-releases], like Zulip 4.0, are
   published every 3-6 months, and contain hundreds of features, bug
   fixes, and improvements to Zulip's internals.
-* New maintenance releases, like 4.3, are published roughly once a
+- New maintenance releases, like 4.3, are published roughly once a
   month. Maintenance releases are designed to have no risky changes
   and be easy to reverse, to minimize stress for administrators. When
   upgrading to a new major release series, We recommend always
@@ -45,7 +45,7 @@ server repository][zulip-server].
   you use the latest version of the upgrade code.
 
 Starting with Zulip 4.0, the Zulip webapp displays the current server
-version in the gear menu.  With older releases, the server version is
+version in the gear menu. With older releases, the server version is
 available [via the API](https://zulip.com/api/get-server-settings).
 
 This ReadTheDocs documentation has a widget in the lower-left corner
@@ -60,25 +60,25 @@ the Zulip server itself (E.g. `https://zulip.example.com/help/`).
 Many Zulip servers run versions from Git that have not been published
 in a stable release.
 
-* [Zulip Cloud](https://zulip.com) essentially runs the master
-  branch. It is usually a few days behind master (with some
+- [Zulip Cloud](https://zulip.com) essentially runs the `main`
+  branch. It is usually a few days behind `main` (with some
   cherry-picked bug fixes), but can fall up to 2 weeks behind when
   major UI or internals changes mean we'd like to bake changes longer
   on chat.zulip.org before exposing them to the full Zulip Cloud
   userbase.
-* [chat.zulip.org][chat-zulip-org], the bleeding-edge server for the
-  Zulip development community, is upgraded to master several times
-  every week.  We also often "test deploy" changes not yet in master
+- [chat.zulip.org][chat-zulip-org], the bleeding-edge server for the
+  Zulip development community, is upgraded to `main` several times
+  every week. We also often "test deploy" changes not yet in `main`
   to chat.zulip.org to facilitate design feedback.
-* We maintain Git branches with names like `4.x` containing backported
-  commits from master that we plan to include in the next maintenance
-  release.  Self hosters can [upgrade][upgrade-from-git] to these
+- We maintain Git branches with names like `4.x` containing backported
+  commits from `main` that we plan to include in the next maintenance
+  release. Self hosters can [upgrade][upgrade-from-git] to these
   stable release branches to get bug fixes staged for the next stable
   release (which is very useful when you reported a bug whose fix we
   choose to backport). We support these branches as though they were a
   stable release.
-* Self-hosters who want new features not yet present in a major
-  release can [upgrade to master][upgrading-to-master] or run [a fork
+- Self-hosters who want new features not yet present in a major
+  release can [upgrade to `main`][upgrading-to-main] or run [a fork
   of Zulip][fork-zulip].
 
 ### Compatibility and upgrading
@@ -89,15 +89,15 @@ for self-hosters, has no regressions, and that the [Zulip upgrade
 process](../production/upgrade-or-modify.md) Just Works.
 
 The Zulip server and clients apps are all carefully engineered to
-ensure compatibility with old versions.  In particular:
+ensure compatibility with old versions. In particular:
 
-* The Zulip mobile and desktop apps maintain backwards-compatibility
-  code to support any Zulip server since 2.1.0.  (They may also work
+- The Zulip mobile and desktop apps maintain backwards-compatibility
+  code to support any Zulip server since 2.1.0. (They may also work
   with older versions, with a degraded experience).
-* Zulip maintains an [API changelog](https://zulip.com/api/changelog)
+- Zulip maintains an [API changelog](https://zulip.com/api/changelog)
   detailing all changes to the API to make it easy for client
   developers to do this correctly.
-* The Zulip server preserves backwards-compatibility in its API to
+- The Zulip server preserves backwards-compatibility in its API to
   support versions of the mobile and desktop apps released in roughly
   the last year. Because these clients auto-update, generally there
   are only a handful of active clients left by the time we desupport a
@@ -117,7 +117,7 @@ bug fix release, transparently documenting the issue(s) using the
 industry-standard [CVE advisory process](https://cve.mitre.org/).
 
 When new security releases are published, we simultaneously publish
-the fixes to the `master` and stable release branches (E.g. `4.x`), so
+the fixes to the `main` and stable release branches (E.g. `4.x`), so
 that anyone using those branches can immediately upgrade as well.
 
 See also our [security model][security-model] documentation.
@@ -130,9 +130,9 @@ Starting with Zulip 4.0, the Zulip webapp will display a banner
 warning users of a server running a Zulip release that is more than 18
 months old. We do this for a few reasons:
 
-* It is unlikely that a server of that age is not vulnerable to
+- It is unlikely that a server of that age is not vulnerable to
   a security bug in Zulip or one of its dependencies.
-* The Zulip mobile and desktop apps are only guaranteed to support
+- The Zulip mobile and desktop apps are only guaranteed to support
   server versions less than 18 months old.
 
 The nag will appear only to organization administrators starting a
@@ -147,7 +147,7 @@ You can adjust the deadline for your installation by setting e.g.
 
 For platforms we support, like Debian and Ubuntu, Zulip aims to
 support all versions of the upstream operating systems that are fully
-supported by the vendor.  We document how to correctly [upgrade the
+supported by the vendor. We document how to correctly [upgrade the
 operating system][os-upgrade] for a Zulip server, including how to
 correctly chain upgrades when the latest Zulip release no longer
 supports your OS.
@@ -163,11 +163,11 @@ releases, and do not support them in production.
 The Zulip server project uses several GitHub labels to structure
 communication within the project about priorities:
 
-* The [high priority][label-high] label tags issues that we consider
+- The [high priority][label-high] label tags issues that we consider
   important. This label is meant to be a determination of importance
   that can be done quickly and then used as an input to planning
   processes.
-* The [release goal][label-release-goal] label is used for work that
+- The [release goal][label-release-goal] label is used for work that
   we hope to include in the next major release. The related [post
   release][label-post-release] label is used to track work we want to
   focus on shortly after the next major release.
@@ -177,7 +177,7 @@ aggregate, just as important as the big things. Most resolved issues
 do not have any of these priority labels.
 
 We welcome participation from our user community in influencing the
-Zulip roadmap.  If a bug or missing feature is causing significant
+Zulip roadmap. If a bug or missing feature is causing significant
 pain for you, we'd love to hear from you, either in
 [chat.zulip.org](../contributing/chat-zulip-org.md) or on the relevant
 GitHub issue. Please an include an explanation of your use case: such
@@ -192,12 +192,12 @@ Zulip's client apps officially support all Zulip server versions (and
 Git commits) released in the previous 18 months, matching the behavior
 of our [upgrade nag](#upgrade-nag).
 
-* The Zulip mobile apps release new versions from the development
+- The Zulip mobile apps release new versions from the development
   branch frequently (usually every couple weeks). Except when fixing a
   critical bug, releases are first published to our [beta
   channels][mobile-beta].
 
-* The Zulip desktop apps are implemented in [Electron][electron], the
+- The Zulip desktop apps are implemented in [Electron][electron], the
   browser-based desktop application framework used by essentially all
   modern chat applications. The Zulip UI in these apps is served from
   the Zulip server (and thus can vary between tabs when it is
@@ -227,19 +227,13 @@ core community, like the Python and JavaScript bindings, are released
 independently as needed.
 
 [electron]: https://www.electronjs.org/
-[upgrading-to-master]: ../production/upgrade-or-modify.html#upgrading-to-master
+[upgrading-to-main]: ../production/upgrade-or-modify.html#upgrading-to-main
 [os-upgrade]: ../production/upgrade-or-modify.html#upgrading-the-operating-system
 [chat-zulip-org]: ../contributing/chat-zulip-org.md
 [fork-zulip]: ../production/upgrade-or-modify.html#modifying-zulip
 [zulip-server]: https://github.com/zulip/zulip
-
 [mobile-beta]: https://github.com/zulip/zulip-mobile#using-the-beta
-
-[label-blocker]:
-https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22priority%3A+blocker%22
-[label-high]:
-https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22priority%3A+high%22
-[label-release-goal]:
-https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22release+goal%22
-[label-post-release]:
-https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22post+release%22
+[label-blocker]: https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22priority%3A+blocker%22
+[label-high]: https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22priority%3A+high%22
+[label-release-goal]: https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22release+goal%22
+[label-post-release]: https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22post+release%22

docs/production/authentication-methods.md

@@ -1,6 +1,6 @@
 # Authentication methods
 
-Zulip supports a wide variety of authentication methods.  Some of them
+Zulip supports a wide variety of authentication methods. Some of them
 require configuration to set up.
 
 To configure or disable authentication methods on your Zulip server,
@@ -19,22 +19,25 @@ Users set a password with the Zulip server, and log in with their
 email and password.
 
 When first setting up your Zulip server, this method must be used for
-creating the initial realm and user.  You can disable it after that.
+creating the initial realm and user. You can disable it after that.
 
 ## Plug-and-play SSO (Google, GitHub, GitLab)
 
 With just a few lines of configuration, your Zulip server can
 authenticate users with any of several single-sign-on (SSO)
 authentication providers:
-* Google accounts, with `GoogleAuthBackend`
-* GitHub accounts, with `GitHubAuthBackend`
-* GitLab accounts, with `GitLabAuthBackend`
-* Microsoft Azure Active Directory, with `AzureADAuthBackend`
+
+- Google accounts, with `GoogleAuthBackend`
+- GitHub accounts, with `GitHubAuthBackend`
+- GitLab accounts, with `GitLabAuthBackend`
+- Microsoft Azure Active Directory, with `AzureADAuthBackend`
 
 Each of these requires one to a handful of lines of configuration in
-`settings.py`, as well as a secret in `zulip-secrets.conf`.  Details
+`settings.py`, as well as a secret in `zulip-secrets.conf`. Details
 are documented in your `settings.py`.
 
+(ldap)=
+
 ## LDAP (including Active Directory)
 
 Zulip supports retrieving information about users via LDAP, and
@@ -43,26 +46,28 @@ optionally using LDAP as an authentication mechanism.
 In either configuration, you will need to do the following:
 
 1. These instructions assume you have an installed Zulip server and
-   are logged into a shell there.  You can have created an
+   are logged into a shell there. You can have created an
    organization already using EmailAuthBackend, or plan to create the
    organization using LDAP authentication.
 
 1. Tell Zulip how to connect to your LDAP server:
-   * Fill out the section of your `/etc/zulip/settings.py` headed "LDAP
+
+   - Fill out the section of your `/etc/zulip/settings.py` headed "LDAP
      integration, part 1: Connecting to the LDAP server".
-   * If a password is required, put it in
+   - If a password is required, put it in
      `/etc/zulip/zulip-secrets.conf` by setting
-     `auth_ldap_bind_password`.  For example: `auth_ldap_bind_password
-     = abcd1234`.
+     `auth_ldap_bind_password`. For example:
+     `auth_ldap_bind_password = abcd1234`.
 
 1. Decide how you want to map the information in your LDAP database to
-   users' account data in Zulip.  For each Zulip user, two closely
+   users' account data in Zulip. For each Zulip user, two closely
    related concepts are:
-   * their **email address**.  Zulip needs this in order to send, for
+
+   - their **email address**. Zulip needs this in order to send, for
      example, a notification when they're offline and another user
      sends a PM.
-   * their **Zulip username**.  This means the name the user types into the
-     Zulip login form.  You might choose for this to be the user's
+   - their **Zulip username**. This means the name the user types into the
+     Zulip login form. You might choose for this to be the user's
      email address (`sam@example.com`), or look like a traditional
      "username" (`sam`), or be something else entirely, depending on
      your environment.
@@ -71,78 +76,82 @@ In either configuration, you will need to do the following:
    in your LDAP database.
 
 1. Tell Zulip how to map the user information in your LDAP database to
-   the form it needs for authentication.  There are three supported
+   the form it needs for authentication. There are three supported
    ways to set up the username and/or email mapping:
 
    (A) Using email addresses as Zulip usernames, if LDAP has each
-      user's email address:
-      * Make `AUTH_LDAP_USER_SEARCH` a query by email address.
-      * Set `AUTH_LDAP_REVERSE_EMAIL_SEARCH` to the same query with
-        `%(email)s` rather than `%(user)s` as the search parameter.
-      * Set `AUTH_LDAP_USERNAME_ATTR` to the name of the LDAP
-        attribute for the user's LDAP username in the search result
-        for `AUTH_LDAP_REVERSE_EMAIL_SEARCH`.
+   user's email address:
+
+   - Make `AUTH_LDAP_USER_SEARCH` a query by email address.
+   - Set `AUTH_LDAP_REVERSE_EMAIL_SEARCH` to the same query with
+     `%(email)s` rather than `%(user)s` as the search parameter.
+   - Set `AUTH_LDAP_USERNAME_ATTR` to the name of the LDAP
+     attribute for the user's LDAP username in the search result
+     for `AUTH_LDAP_REVERSE_EMAIL_SEARCH`.
 
    (B) Using LDAP usernames as Zulip usernames, with email addresses
-      formed consistently like `sam` -> `sam@example.com`:
-      * Set `AUTH_LDAP_USER_SEARCH` to query by LDAP username
-      * Set `LDAP_APPEND_DOMAIN = "example.com"`.
+   formed consistently like `sam` -> `sam@example.com`:
+
+   - Set `AUTH_LDAP_USER_SEARCH` to query by LDAP username
+   - Set `LDAP_APPEND_DOMAIN = "example.com"`.
 
    (C) Using LDAP usernames as Zulip usernames, with email addresses
-      taken from some other attribute in LDAP (for example, `mail`):
-      * Set `AUTH_LDAP_USER_SEARCH` to query by LDAP username
-      * Set `LDAP_EMAIL_ATTR = "mail"`.
-      * Set `AUTH_LDAP_REVERSE_EMAIL_SEARCH` to a query that will find
-        an LDAP user given their email address (i.e. a search by
-        `LDAP_EMAIL_ATTR`).  For example:
-        ```
-        AUTH_LDAP_REVERSE_EMAIL_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
-                                                    ldap.SCOPE_SUBTREE, "(mail=%(email)s)")
-        ```
-      * Set `AUTH_LDAP_USERNAME_ATTR` to the name of the LDAP
-        attribute for the user's LDAP username in that search result.
+   taken from some other attribute in LDAP (for example, `mail`):
+
+   - Set `AUTH_LDAP_USER_SEARCH` to query by LDAP username
+   - Set `LDAP_EMAIL_ATTR = "mail"`.
+   - Set `AUTH_LDAP_REVERSE_EMAIL_SEARCH` to a query that will find
+     an LDAP user given their email address (i.e. a search by
+     `LDAP_EMAIL_ATTR`). For example:
+     ```python
+     AUTH_LDAP_REVERSE_EMAIL_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
+                                                 ldap.SCOPE_SUBTREE, "(mail=%(email)s)")
+     ```
+   - Set `AUTH_LDAP_USERNAME_ATTR` to the name of the LDAP
+     attribute for the user's LDAP username in that search result.
 
 You can quickly test whether your configuration works by running:
 
-```
+```bash
 /home/zulip/deployments/current/manage.py query_ldap username
 ```
 
-from the root of your Zulip installation.  If your configuration is
+from the root of your Zulip installation. If your configuration is
 working, that will output the full name for your user (and that user's
 email address, if it isn't the same as the "Zulip username").
 
 **Active Directory**: Most Active Directory installations will use one
 of the following configurations:
 
-* To access by Active Directory username:
-    ```
-    AUTH_LDAP_USER_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
-                                       ldap.SCOPE_SUBTREE, "(sAMAccountName=%(user)s)")
-    AUTH_LDAP_REVERSE_EMAIL_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
-                                       ldap.SCOPE_SUBTREE, "(mail=%(email)s)")
-    AUTH_LDAP_USERNAME_ATTR = "sAMAccountName"
-    ```
+- To access by Active Directory username:
 
-* To access by Active Directory email address:
-    ```
-    AUTH_LDAP_USER_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
-                                       ldap.SCOPE_SUBTREE, "(mail=%(user)s)")
-    AUTH_LDAP_REVERSE_EMAIL_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
-                                                ldap.SCOPE_SUBTREE, "(mail=%(email)s)")
-    AUTH_LDAP_USERNAME_ATTR = "mail"
-    ```
+  ```python
+  AUTH_LDAP_USER_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
+                                     ldap.SCOPE_SUBTREE, "(sAMAccountName=%(user)s)")
+  AUTH_LDAP_REVERSE_EMAIL_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
+                                     ldap.SCOPE_SUBTREE, "(mail=%(email)s)")
+  AUTH_LDAP_USERNAME_ATTR = "sAMAccountName"
+  ```
+
+- To access by Active Directory email address:
+  ```python
+  AUTH_LDAP_USER_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
+                                     ldap.SCOPE_SUBTREE, "(mail=%(user)s)")
+  AUTH_LDAP_REVERSE_EMAIL_SEARCH = LDAPSearch("ou=users,dc=example,dc=com",
+                                              ldap.SCOPE_SUBTREE, "(mail=%(email)s)")
+  AUTH_LDAP_USERNAME_ATTR = "mail"
+  ```
 
 **If you are using LDAP for authentication**: you will need to enable
 the `zproject.backends.ZulipLDAPAuthBackend` auth backend, in
-`AUTHENTICATION_BACKENDS` in `/etc/zulip/settings.py`.  After doing so
+`AUTHENTICATION_BACKENDS` in `/etc/zulip/settings.py`. After doing so
 (and as always [restarting the Zulip server](settings.md) to ensure
 your settings changes take effect), you should be able to log in to
 Zulip by entering your email address and LDAP password on the Zulip
 login form.
 
 You may also want to configure Zulip's settings for [inviting new
-users](https://zulip.com/help/invite-new-users).  If LDAP is the
+users](https://zulip.com/help/invite-new-users). If LDAP is the
 only enabled authentication method, the main use case for Zulip's
 invitation feature is selecting the initial streams for invited users
 (invited users will still need to use their LDAP password to create an
@@ -154,7 +163,7 @@ Zulip can automatically synchronize data declared in
 `AUTH_LDAP_USER_ATTR_MAP` from LDAP into Zulip, via the following
 management command:
 
-```
+```bash
 /home/zulip/deployments/current/manage.py sync_ldap_user_data
 ```
 
@@ -165,11 +174,12 @@ We recommend running this command in a **regular cron job**, to pick
 up changes made on your LDAP server.
 
 All of these data synchronization options have the same model:
-* New users will be populated automatically with the
+
+- New users will be populated automatically with the
   name/avatar/etc. from LDAP (as configured) on account creation.
-* The `manage.py sync_ldap_user_data` cron job will automatically
+- The `manage.py sync_ldap_user_data` cron job will automatically
   update existing users with any changes that were made in LDAP.
-* You can easily test your configuration using `manage.py query_ldap`.
+- You can easily test your configuration using `manage.py query_ldap`.
   Once you're happy with the configuration, remember to restart the
   Zulip server with
   `/home/zulip/deployments/current/scripts/restart-server` so that
@@ -193,10 +203,10 @@ or `jpegPhoto` attribute in LDAP) by configuring the `avatar` key in
 
 Starting with Zulip 2.0, Zulip supports syncing
 [custom profile fields][custom-profile-fields] from LDAP / Active
-Directory.  To configure this, you first need to
+Directory. To configure this, you first need to
 [configure some custom profile fields][custom-profile-fields] for your
-Zulip organization.  Then, define a mapping from the fields you'd like
-to sync from LDAP to the corresponding LDAP attributes.  For example,
+Zulip organization. Then, define a mapping from the fields you'd like
+to sync from LDAP to the corresponding LDAP attributes. For example,
 if you have a custom profile field `LinkedIn Profile` and the
 corresponding LDAP attribute is `linkedinProfile` then you just need
 to add `'custom_profile_field__linkedin_profile': 'linkedinProfile'`
@@ -207,22 +217,22 @@ to the `AUTH_LDAP_USER_ATTR_MAP`.
 #### Automatically deactivating users with Active Directory
 
 Starting with Zulip 2.0, Zulip supports synchronizing the
-disabled/deactivated status of users from Active Directory.  You can
-configure this by uncommenting the sample line `"userAccountControl":
-"userAccountControl",` in `AUTH_LDAP_USER_ATTR_MAP` (and restarting
-the Zulip server).  Zulip will then treat users that are disabled via
-the "Disable Account" feature in Active Directory as deactivated in
-Zulip.
+disabled/deactivated status of users from Active Directory. You can
+configure this by uncommenting the sample line
+`"userAccountControl": "userAccountControl",` in
+`AUTH_LDAP_USER_ATTR_MAP` (and restarting the Zulip server). Zulip
+will then treat users that are disabled via the "Disable Account"
+feature in Active Directory as deactivated in Zulip.
 
 Users disabled in active directory will be immediately unable to log in
 to Zulip, since Zulip queries the LDAP/Active Directory server on
-every login attempt.  The user will be fully deactivated the next time
+every login attempt. The user will be fully deactivated the next time
 your `manage.py sync_ldap_user_data` cron job runs (at which point
 they will be forcefully logged out from all active browser sessions,
 appear as deactivated in the Zulip UI, etc.).
 
 This feature works by checking for the `ACCOUNTDISABLE` flag on the
-`userAccountControl` field in Active Directory.  See
+`userAccountControl` field in Active Directory. See
 [this handy resource](https://jackstromberg.com/2013/01/useraccountcontrol-attributeflag-values/)
 for details on the various `userAccountControl` flags.
 
@@ -231,28 +241,28 @@ for details on the various `userAccountControl` flags.
 Starting with Zulip 2.0, Zulip supports automatically deactivating
 users if they are not found by the `AUTH_LDAP_USER_SEARCH` query
 (either because the user is no longer in LDAP/Active Directory, or
-because the user no longer matches the query).  This feature is
+because the user no longer matches the query). This feature is
 enabled by default if LDAP is the only authentication backend
-configured on the Zulip server.  Otherwise, you can enable this
+configured on the Zulip server. Otherwise, you can enable this
 feature by setting `LDAP_DEACTIVATE_NON_MATCHING_USERS` to `True` in
-`/etc/zulip/settings.py`.  Nonmatching users will be fully deactivated
+`/etc/zulip/settings.py`. Nonmatching users will be fully deactivated
 the next time your `manage.py sync_ldap_user_data` cron job runs.
 
 #### Other fields
 
 Other fields you may want to sync from LDAP include:
 
-* Boolean flags; `is_realm_admin` (the organization's administrator
-  permission) is the main one.  You can use the
+- Boolean flags; `is_realm_admin` (the organization's administrator
+  permission) is the main one. You can use the
   [AUTH_LDAP_USER_FLAGS_BY_GROUP][django-auth-booleans] feature of
   `django-auth-ldap` to configure a group to get this permissions.
   (We don't recommend using this flags feature for managing
   `is_active` because deactivating a user this way would not disable
   any active sessions the user might have; see the above discussion of
   automatic deactivation for how to do that properly).
-* String fields like `default_language` (e.g. `en`) or `timezone`, if
+- String fields like `default_language` (e.g. `en`) or `timezone`, if
   you have that data in the right format in your LDAP database.
-* [Coming soon][custom-profile-fields-ldap]: Support for syncing
+- [Coming soon][custom-profile-fields-ldap]: Support for syncing
   [custom profile fields](https://zulip.com/help/add-custom-profile-fields)
   from your LDAP database.
 
@@ -260,14 +270,15 @@ You can look at the [full list of fields][models-py] in the Zulip user
 model; search for `class UserProfile`, but the above should cover all
 the fields that would be useful to sync from your LDAP databases.
 
-[models-py]: https://github.com/zulip/zulip/blob/master/zerver/models.py
+[models-py]: https://github.com/zulip/zulip/blob/main/zerver/models.py
 [django-auth-booleans]: https://django-auth-ldap.readthedocs.io/en/latest/users.html#easy-attributes
 [custom-profile-fields-ldap]: https://github.com/zulip/zulip/issues/10976
 
 ### Multiple LDAP searches
 
-To do the union of multiple LDAP searches, use `LDAPSearchUnion`.  For example:
-```
+To do the union of multiple LDAP searches, use `LDAPSearchUnion`. For example:
+
+```python
 AUTH_LDAP_USER_SEARCH = LDAPSearchUnion(
     LDAPSearch("ou=users,dc=example,dc=com", ldap.SCOPE_SUBTREE, "(uid=%(user)s)"),
     LDAPSearch("ou=otherusers,dc=example,dc=com", ldap.SCOPE_SUBTREE, "(uid=%(user)s)"),
@@ -278,7 +289,7 @@ AUTH_LDAP_USER_SEARCH = LDAPSearchUnion(
 
 You can restrict access to your Zulip server to a set of LDAP groups
 using the `AUTH_LDAP_REQUIRE_GROUP` and `AUTH_LDAP_DENY_GROUP`
-settings in `/etc/zulip/settings.py`.  See the
+settings in `/etc/zulip/settings.py`. See the
 [upstream django-auth-ldap documentation][upstream-ldap-groups] for
 details.
 
@@ -289,7 +300,7 @@ details.
 If you're hosting multiple Zulip organizations, you can restrict which
 users have access to which organizations.
 This is done by setting `org_membership` in `AUTH_LDAP_USER_ATTR_MAP` to the name of
-the LDAP attribute which will contain a list of  subdomains that the
+the LDAP attribute which will contain a list of subdomains that the
 user should be allowed to access.
 
 For the root subdomain, `www` in the list will work, or any other of
@@ -297,7 +308,8 @@ For the root subdomain, `www` in the list will work, or any other of
 
 For example, with `org_membership` set to `department`, a user with
 the following attributes will have access to the root and `engineering` subdomains:
-```
+
+```text
 ...
 department: engineering
 department: www
@@ -305,7 +317,7 @@ department: www
 ```
 
 More complex access control rules are possible via the
-`AUTH_LDAP_ADVANCED_REALM_ACCESS_CONTROL` setting.  Note that
+`AUTH_LDAP_ADVANCED_REALM_ACCESS_CONTROL` setting. Note that
 `org_membership` takes precedence over
 `AUTH_LDAP_ADVANCED_REALM_ACCESS_CONTROL`:
 
@@ -313,34 +325,33 @@ More complex access control rules are possible via the
 2. If `org_membership` is not set or does not allow access,
    `AUTH_LDAP_ADVANCED_REALM_ACCESS_CONTROL` will control access.
 
-This contains a map keyed by the organization's subdomain.  The
+This contains a map keyed by the organization's subdomain. The
 organization list with multiple maps, that contain a map with an attribute, and a required
 value for that attribute. If for any of the attribute maps, all user's
 LDAP attributes match what is configured, access is granted.
 
-```eval_rst
-.. warning::
-    Restricting access using these mechanisms only affects authentication via LDAP,
-    and won't prevent users from accessing the organization using any other
-    authentication backends that are enabled for the organization.
-```
+:::{warning}
+Restricting access using these mechanisms only affects authentication via LDAP,
+and won't prevent users from accessing the organization using any other
+authentication backends that are enabled for the organization.
+:::
 
 ### Troubleshooting
 
 Most issues with LDAP authentication are caused by misconfigurations of
-the user and email search settings.  Some things you can try to get to
+the user and email search settings. Some things you can try to get to
 the bottom of the problem:
 
-* Review the instructions for the LDAP configuration type you're
+- Review the instructions for the LDAP configuration type you're
   using: (A), (B) or (C) (described above), and that you have
   configured all of the required settings documented in the
   instructions for that configuration type.
-* Use the `manage.py query_ldap` tool to verify your configuration.
+- Use the `manage.py query_ldap` tool to verify your configuration.
   The output of the command will usually indicate the cause of any
-  configuration problem.  For the LDAP integration to work, this
+  configuration problem. For the LDAP integration to work, this
   command should be able to successfully fetch a complete, correct set
   of data for the queried user.
-* You can find LDAP-specific logs in `/var/log/zulip/ldap.log`. If
+- You can find LDAP-specific logs in `/var/log/zulip/ldap.log`. If
   you're asking for help with your setup, please provide logs from
   this file (feel free to anonymize any email addresses to
   `username@example.com`) in your report.
@@ -348,7 +359,7 @@ the bottom of the problem:
 ## SAML
 
 Zulip 2.1 and later supports SAML authentication, used by Okta,
-OneLogin, and many other IdPs (identity providers).  You can configure
+OneLogin, and many other IdPs (identity providers). You can configure
 it as follows:
 
 1. These instructions assume you have an installed Zulip server; if
@@ -361,39 +372,39 @@ it as follows:
 
 1. Tell your IdP how to find your Zulip server:
 
-    * **SP Entity ID**: `https://yourzulipdomain.example.com`.
+   - **SP Entity ID**: `https://yourzulipdomain.example.com`.
 
-      The `Entity ID` should match the value of
-      `SOCIAL_AUTH_SAML_SP_ENTITY_ID` computed in the Zulip settings.
-       You can get the correct value by running the following:
-      `/home/zulip/deployments/current/scripts/get-django-setting
-       SOCIAL_AUTH_SAML_SP_ENTITY_ID`.
+     The `Entity ID` should match the value of
+     `SOCIAL_AUTH_SAML_SP_ENTITY_ID` computed in the Zulip settings.
+     You can get the correct value by running the following:
+     `/home/zulip/deployments/current/scripts/get-django-setting SOCIAL_AUTH_SAML_SP_ENTITY_ID`.
 
-    * **SSO URL**:
-      `https://yourzulipdomain.example.com/complete/saml/`.  This is
-      the "SAML ACS url" in SAML terminology.
+   - **SSO URL**:
+     `https://yourzulipdomain.example.com/complete/saml/`. This is
+     the "SAML ACS url" in SAML terminology.
 
-      If you're
-      [hosting multiple organizations](../production/multiple-organizations.html#authentication),
-      you need to use `SOCIAL_AUTH_SUBDOMAIN`.  For example,
-      if `SOCIAL_AUTH_SUBDOMAIN="auth"` and `EXTERNAL_HOST=zulip.example.com`,
-      this should be `https://auth.zulip.example.com/complete/saml/`.
+     If you're
+     [hosting multiple organizations](../production/multiple-organizations.html#authentication),
+     you need to use `SOCIAL_AUTH_SUBDOMAIN`. For example,
+     if `SOCIAL_AUTH_SUBDOMAIN="auth"` and `EXTERNAL_HOST=zulip.example.com`,
+     this should be `https://auth.zulip.example.com/complete/saml/`.
 
-2. Tell Zulip how to connect to your SAML provider(s) by filling
+1. Tell Zulip how to connect to your SAML provider(s) by filling
    out the section of `/etc/zulip/settings.py` on your Zulip server
    with the heading "SAML Authentication".
-   * You will need to update `SOCIAL_AUTH_SAML_ORG_INFO` with your
+
+   - You will need to update `SOCIAL_AUTH_SAML_ORG_INFO` with your
      organization name (`displayname` may appear in the IdP's
      authentication flow; `name` won't be displayed to humans).
-   * Fill out `SOCIAL_AUTH_SAML_ENABLED_IDPS` with data provided by
-     your identity provider.  You may find [the python-social-auth
+   - Fill out `SOCIAL_AUTH_SAML_ENABLED_IDPS` with data provided by
+     your identity provider. You may find [the python-social-auth
      SAML
      docs](https://python-social-auth.readthedocs.io/en/latest/backends/saml.html)
-     helpful.  You'll need to obtain several values from your IdP's
+     helpful. You'll need to obtain several values from your IdP's
      metadata and enter them on the right-hand side of this
      Python dictionary:
      1. Set the outer `idp_name` key to be an identifier for your IdP,
-        e.g. `testshib` or `okta`.  This field appears in URLs for
+        e.g. `testshib` or `okta`. This field appears in URLs for
         parts of your Zulip server's SAML authentication flow.
      2. The IdP should provide the `url` and `entity_id` values.
      3. Save the `x509cert` value to a file; you'll use it in the
@@ -401,55 +412,57 @@ it as follows:
      4. The values needed in the `attr_` fields are often configurable
         in your IdP's interface when setting up SAML authentication
         (referred to as "Attribute Statements" with Okta, or
-        "Attribute Mapping" with GSuite).  You'll want to connect
+        "Attribute Mapping" with GSuite). You'll want to connect
         these so that Zulip gets the email address (used as a unique
         user ID) and name for the user.
      5. The `display_name` and `display_icon` fields are used to
         display the login/registration buttons for the IdP.
+     6. The `auto_signup` field determines how Zulip should handle
+        login attempts by users who don't have an account yet.
 
-3. Install the certificate(s) required for SAML authentication.  You
-    will definitely need the public certificate of your IdP.  Some IdP
-    providers also support the Zulip server (Service Provider) having
-    a certificate used for encryption and signing.  We detail these
-    steps as optional below, because they aren't required for basic
-    setup, and some IdPs like Okta don't fully support Service
-    Provider certificates.  You should install them as follows:
+1. Install the certificate(s) required for SAML authentication. You
+   will definitely need the public certificate of your IdP. Some IdP
+   providers also support the Zulip server (Service Provider) having
+   a certificate used for encryption and signing. We detail these
+   steps as optional below, because they aren't required for basic
+   setup, and some IdPs like Okta don't fully support Service
+   Provider certificates. You should install them as follows:
 
-    1. On your Zulip server, `mkdir -p /etc/zulip/saml/idps/`
-    2. Put the IDP public certificate in `/etc/zulip/saml/idps/{idp_name}.crt`
-    3. (Optional) Put the Zulip server public certificate in `/etc/zulip/saml/zulip-cert.crt`
-       and the corresponding private key in `/etc/zulip/saml/zulip-private-key.key`. Note that
-       the certificate should be the single X.509 certificate for the server, not a full chain of
-       trust, which consists of multiple certificates.
-    4. Set the proper permissions on these files and directories:
+   1. On your Zulip server, `mkdir -p /etc/zulip/saml/idps/`
+   2. Put the IDP public certificate in `/etc/zulip/saml/idps/{idp_name}.crt`
+   3. (Optional) Put the Zulip server public certificate in `/etc/zulip/saml/zulip-cert.crt`
+      and the corresponding private key in `/etc/zulip/saml/zulip-private-key.key`. Note that
+      the certificate should be the single X.509 certificate for the server, not a full chain of
+      trust, which consists of multiple certificates.
+   4. Set the proper permissions on these files and directories:
 
-    ```
-    chown -R zulip.zulip /etc/zulip/saml/
-    find /etc/zulip/saml/ -type f -exec chmod 644 -- {} +
-    chmod 640 /etc/zulip/saml/zulip-private-key.key
-    ```
+      ```bash
+      chown -R zulip.zulip /etc/zulip/saml/
+      find /etc/zulip/saml/ -type f -exec chmod 644 -- {} +
+      chmod 640 /etc/zulip/saml/zulip-private-key.key
+      ```
 
-4. (Optional) If you configured the optional public and private server
+1. (Optional) If you configured the optional public and private server
    certificates above, you can enable the additional setting
    `"authnRequestsSigned": True` in `SOCIAL_AUTH_SAML_SECURITY_CONFIG`
    to have the SAMLRequests the server will be issuing to the IdP
-   signed using those certificates.  Additionally, if the IdP supports
+   signed using those certificates. Additionally, if the IdP supports
    it, you can upload the public certificate to enable encryption of
    assertions in the SAMLResponses the IdP will send about
    authenticated users.
 
-5. Enable the `zproject.backends.SAMLAuthBackend` auth backend, in
-`AUTHENTICATION_BACKENDS` in `/etc/zulip/settings.py`.
+1. Enable the `zproject.backends.SAMLAuthBackend` auth backend, in
+   `AUTHENTICATION_BACKENDS` in `/etc/zulip/settings.py`.
 
-6. [Restart the Zulip server](../production/settings.md) to ensure
-your settings changes take effect.  The Zulip login page should now
-have a button for SAML authentication that you can use to log in or
-create an account (including when creating a new organization).
+1. [Restart the Zulip server](../production/settings.md) to ensure
+   your settings changes take effect. The Zulip login page should now
+   have a button for SAML authentication that you can use to log in or
+   create an account (including when creating a new organization).
 
-7. If the configuration was successful, the server's metadata can be
-found at `https://yourzulipdomain.example.com/saml/metadata.xml`. You
-can use this for verifying your configuration or provide it to your
-IdP.
+1. If the configuration was successful, the server's metadata can be
+   found at `https://yourzulipdomain.example.com/saml/metadata.xml`. You
+   can use this for verifying your configuration or provide it to your
+   IdP.
 
 [saml-help-center]: https://zulip.com/help/saml-authentication
 
@@ -457,7 +470,7 @@ IdP.
 
 The above configuration is sufficient for Service Provider initialized
 SSO, i.e. you can visit the Zulip webapp and click "Sign in with
-{IdP}" and it'll correctly start the authentication flow.  If you are
+{IdP}" and it'll correctly start the authentication flow. If you are
 not hosting multiple organizations, with Zulip 3.0+, the above
 configuration is also sufficient for Identity Provider initiated SSO,
 i.e. clicking a "Sign in to Zulip" button on the IdP's website can
@@ -465,15 +478,11 @@ correctly authenticate the user to Zulip.
 
 If you're hosting multiple organizations and thus using the
 `SOCIAL_AUTH_SUBDOMAIN` setting, you'll need to configure a custom
-`RelayState` in your IdP of the form `{"subdomain":
-"yourzuliporganization"}` to let Zulip know which organization to
-authenticate the user to when they visit your SSO URL from the IdP.
-(If the organization is on the root domain, use the empty string:
-`{"subdomain": ""}`.).
-
-```eval_rst
-.. _ldap:
-```
+`RelayState` in your IdP of the form
+`{"subdomain": "yourzuliporganization"}` to let Zulip know which
+organization to authenticate the user to when they visit your SSO URL
+from the IdP. (If the organization is on the root domain, use the
+empty string: `{"subdomain": ""}`.).
 
 ### Restricting access to specific organizations
 
@@ -491,7 +500,7 @@ For example, with `attr_org_membership` set to `member`, a user with
 the following attribute in their `AttributeStatement` will have access
 to the root and `engineering` subdomains:
 
-```
+```xml
 <saml2:Attribute Name="member" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified">
   <saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">
     www
@@ -502,7 +511,6 @@ to the root and `engineering` subdomains:
 </saml2:Attribute>
 ```
 
-
 ## Apache-based SSO with `REMOTE_USER`
 
 If you have any existing SSO solution where a preferred way to deploy
@@ -514,17 +522,17 @@ straightforward way to deploy that SSO solution with Zulip.
 
 1. In `/etc/zulip/settings.py`, configure two settings:
 
-   * `AUTHENTICATION_BACKENDS`: `'zproject.backends.ZulipRemoteUserBackend'`,
+   - `AUTHENTICATION_BACKENDS`: `'zproject.backends.ZulipRemoteUserBackend'`,
      and no other entries.
 
-   * `SSO_APPEND_DOMAIN`: see documentation in `settings.py`.
+   - `SSO_APPEND_DOMAIN`: see documentation in `settings.py`.
 
    Make sure that you've restarted the Zulip server since making this
    configuration change.
 
 2. Edit `/etc/zulip/zulip.conf` and change the `puppet_classes` line to read:
 
-   ```
+   ```ini
    puppet_classes = zulip::profile::standalone, zulip::apache_sso
    ```
 
@@ -533,7 +541,7 @@ straightforward way to deploy that SSO solution with Zulip.
 
 4. To configure our SSO integration, edit a copy of
    `/etc/apache2/sites-available/zulip-sso.example`, saving the result
-   as `/etc/apache2/sites-available/zulip-sso.conf`.  The example sets
+   as `/etc/apache2/sites-available/zulip-sso.conf`. The example sets
    up HTTP basic auth, with an `htpasswd` file; you'll want to replace
    that with configuration for your SSO solution to authenticate the
    user and set `REMOTE_USER`.
@@ -541,8 +549,9 @@ straightforward way to deploy that SSO solution with Zulip.
    For testing, you may want to move ahead with the rest of the setup
    using the `htpasswd` example configuration and demonstrate that
    working end-to-end, before returning later to configure your SSO
-   solution.  You can do that with the following steps:
-   ```
+   solution. You can do that with the following steps:
+
+   ```bash
    /home/zulip/deployments/current/scripts/restart-server
    cd /etc/apache2/sites-available/
    cp zulip-sso.example zulip-sso.conf
@@ -551,9 +560,9 @@ straightforward way to deploy that SSO solution with Zulip.
 
 5. Run `a2ensite zulip-sso` to enable the SSO integration within Apache.
 
-6. Run `service apache2 reload` to use your new configuration.  If
-   Apache isn't already running, you may need to run `service apache2
-   start` instead.
+6. Run `service apache2 reload` to use your new configuration. If
+   Apache isn't already running, you may need to run
+   `service apache2 start` instead.
 
 Now you should be able to visit your Zulip server in a browser (e.g.,
 at `https://zulip.example.com/`) and log in via the SSO solution.
@@ -561,28 +570,28 @@ at `https://zulip.example.com/`) and log in via the SSO solution.
 ### Troubleshooting Apache-based SSO
 
 Most issues with this setup tend to be subtle issues with the
-hostname/DNS side of the configuration.  Suggestions for how to
+hostname/DNS side of the configuration. Suggestions for how to
 improve this SSO setup documentation are very welcome!
 
-* For example, common issues have to do with `/etc/hosts` not mapping
+- For example, common issues have to do with `/etc/hosts` not mapping
   `settings.EXTERNAL_HOST` to the Apache listening on
   `127.0.0.1`/`localhost`.
 
-* While debugging, it can often help to temporarily change the Apache
+- While debugging, it can often help to temporarily change the Apache
   config in `/etc/apache2/sites-available/zulip-sso` to listen on all
   interfaces rather than just `127.0.0.1`.
 
-* While debugging, it can also be helpful to change `proxy_pass` in
+- While debugging, it can also be helpful to change `proxy_pass` in
   `/etc/nginx/zulip-include/app.d/external-sso.conf` to point to a
   more explicit URL, possibly not over HTTPS.
 
-* The following log files can be helpful when debugging this setup:
+- The following log files can be helpful when debugging this setup:
 
-   * `/var/log/zulip/{errors.log,server.log}` (the usual places)
-   * `/var/log/nginx/access.log` (nginx access logs)
-   * `/var/log/apache2/zulip_auth_access.log` (from the
-     `zulip-sso.conf` Apache config file; you may want to change
-     `LogLevel` in that file to "debug" to make this more verbose)
+  - `/var/log/zulip/{errors.log,server.log}` (the usual places)
+  - `/var/log/nginx/access.log` (nginx access logs)
+  - `/var/log/apache2/zulip_auth_access.log` (from the
+    `zulip-sso.conf` Apache config file; you may want to change
+    `LogLevel` in that file to "debug" to make this more verbose)
 
 ### Life of an Apache-based SSO login attempt
 
@@ -591,31 +600,31 @@ assuming you're using the example configuration with HTTP basic auth.
 This summary should help with understanding what's going on as you try
 to debug.
 
-* Since you've configured `/etc/zulip/settings.py` to only define the
+- Since you've configured `/etc/zulip/settings.py` to only define the
   `zproject.backends.ZulipRemoteUserBackend`,
   `zproject/computed_settings.py` configures `/accounts/login/sso/` as
-  `HOME_NOT_LOGGED_IN`.  This makes `https://zulip.example.com/`
+  `HOME_NOT_LOGGED_IN`. This makes `https://zulip.example.com/`
   (a.k.a. the homepage for the main Zulip Django app running behind
   nginx) redirect to `/accounts/login/sso/` for a user that isn't
   logged in.
 
-* nginx proxies requests to `/accounts/login/sso/` to an Apache
+- nginx proxies requests to `/accounts/login/sso/` to an Apache
   instance listening on `localhost:8888`, via the config in
   `/etc/nginx/zulip-include/app.d/external-sso.conf` (using the
   upstream `localhost_sso`, defined in `/etc/nginx/zulip-include/upstreams`).
 
-* The Apache `zulip-sso` site which you've enabled listens on
+- The Apache `zulip-sso` site which you've enabled listens on
   `localhost:8888` and (in the example config) presents the `htpasswd`
-  dialogue.  (In a real configuration, it takes the user through
-  whatever more complex interaction your SSO solution performs.)  The
+  dialogue. (In a real configuration, it takes the user through
+  whatever more complex interaction your SSO solution performs.) The
   user provides correct login information, and the request reaches a
   second Zulip Django app instance, running behind Apache, with
-  `REMOTE_USER` set.  That request is served by
+  `REMOTE_USER` set. That request is served by
   `zerver.views.remote_user_sso`, which just checks the `REMOTE_USER`
   variable and either logs the user in or, if they don't have an
-  account already, registers them.  The login sets a cookie.
+  account already, registers them. The login sets a cookie.
 
-* After succeeding, that redirects the user back to `/` on port 443.
+- After succeeding, that redirects the user back to `/` on port 443.
   This request is sent by nginx to the main Zulip Django app, which
   sees the cookie, treats them as logged in, and proceeds to serve
   them the main app page normally.
@@ -623,43 +632,44 @@ to debug.
 ## Sign in with Apple
 
 Zulip supports using the web flow for Sign in with Apple on
-self-hosted servers.  To do so, you'll need to do the following:
+self-hosted servers. To do so, you'll need to do the following:
 
 1. Visit [the Apple Developer site][apple-developer] and [Create a
-Services ID.][apple-create-services-id]. When prompted for a "Return
-URL", enter `https://zulip.example.com/complete/apple/` (using the
-domain for your server).
+   Services ID.][apple-create-services-id]. When prompted for a "Return
+   URL", enter `https://zulip.example.com/complete/apple/` (using the
+   domain for your server).
 
 1. Create a [Sign in with Apple private key][apple-create-private-key].
 
 1. Store the resulting private key at
-   `/etc/zulip/apple-auth-key.p8`.  Be sure to set
+   `/etc/zulip/apple-auth-key.p8`. Be sure to set
    permissions correctly:
 
-   ```
+   ```bash
    chown zulip:zulip /etc/zulip/apple-auth-key.p8
    chmod 640 /etc/zulip/apple-auth-key.p8
    ```
 
 1. Configure Apple authentication in `/etc/zulip/settings.py`:
-   * `SOCIAL_AUTH_APPLE_TEAM`: Your Team ID from Apple, which is a
+
+   - `SOCIAL_AUTH_APPLE_TEAM`: Your Team ID from Apple, which is a
      string like "A1B2C3D4E5".
-   * `SOCIAL_AUTH_APPLE_SERVICES_ID`: The Services ID you created in
+   - `SOCIAL_AUTH_APPLE_SERVICES_ID`: The Services ID you created in
      step 1, which might look like "com.example.services".
-   * `SOCIAL_AUTH_APPLE_APP_ID`: The App ID, or Bundle ID, of your
+   - `SOCIAL_AUTH_APPLE_APP_ID`: The App ID, or Bundle ID, of your
      app that you used in step 1 to configure your Services ID.
      This might look like "com.example.app".
-   * `SOCIAL_AUTH_APPLE_KEY`: Despite the name this is not a key, but
-     rather the Key ID of the key you created in step 2.  This looks
+   - `SOCIAL_AUTH_APPLE_KEY`: Despite the name this is not a key, but
+     rather the Key ID of the key you created in step 2. This looks
      like "F6G7H8I9J0".
-   * `AUTHENTICATION_BACKENDS`: Uncomment (or add) a line like
+   - `AUTHENTICATION_BACKENDS`: Uncomment (or add) a line like
      `'zproject.backends.AppleAuthBackend',` to enable Apple auth
      using the created configuration.
 
 1. Register with Apple the email addresses or domains your Zulip
-   server sends email to users from.  For instructions and background,
+   server sends email to users from. For instructions and background,
    see the "Email Relay Service" subsection of
-   [this page][apple-get-started].  For details on what email
+   [this page][apple-get-started]. For details on what email
    addresses Zulip sends from, see our
    [outgoing email documentation][outgoing-email].
 
@@ -679,7 +689,7 @@ bit of code, and pull requests to add new backends are welcome.
 For example, the
 [Azure Active Directory integration](https://github.com/zulip/zulip/commit/49dbd85a8985b12666087f9ea36acb6f7da0aa4f)
 was about 30 lines of code, plus some documentation and an
-[automatically generated migration][schema-migrations].  We also have
+[automatically generated migration][schema-migrations]. We also have
 helpful developer documentation on
 [testing auth backends](../development/authentication.md).
 
@@ -689,5 +699,5 @@ helpful developer documentation on
 ## Development only
 
 The `DevAuthBackend` method is used only in development, to allow
-passwordless login as any user in a development environment.  It's
+passwordless login as any user in a development environment. It's
 mentioned on this page only for completeness.

docs/production/deployment.md

@@ -4,14 +4,14 @@ The default Zulip installation instructions will install a complete
 Zulip server, with all of the services it needs, on a single machine.
 
 For production deployment, however, it's common to want to do
-something more complicated.  This page documents the options for doing so.
+something more complicated. This page documents the options for doing so.
 
 ## Installing Zulip from Git
 
 To install a development version of Zulip from Git, just clone the Git
 repository from GitHub:
 
-```
+```bash
 # First, install Git if you don't have it installed already
 sudo apt install git
 git clone https://github.com/zulip/zulip.git zulip-server-git
@@ -21,25 +21,25 @@ and then
 [continue the normal installation instructions](../production/install.html#step-2-install-zulip).
 You can also [upgrade Zulip from Git](../production/upgrade-or-modify.html#upgrading-from-a-git-repository).
 
-The most common use case for this is upgrading to `master` to get a
+The most common use case for this is upgrading to `main` to get a
 feature that hasn't made it into an official release yet (often
-support for a new base OS release).  See [upgrading to
-master][upgrade-to-master] for notes on how `master` works and the
+support for a new base OS release). See [upgrading to
+main][upgrade-to-main] for notes on how `main` works and the
 support story for it, and [upgrading to future
 releases][upgrade-to-future-release] for notes on upgrading Zulip
 afterwards.
 
 In particular, we are always very glad to investigate problems with
-installing Zulip from `master`; they are rare and help us ensure that
+installing Zulip from `main`; they are rare and help us ensure that
 our next major release has a reliable install experience.
 
-[upgrade-to-master]: ../production/upgrade-or-modify.html#upgrading-to-master
+[upgrade-to-main]: ../production/upgrade-or-modify.html#upgrading-to-main
 [upgrade-to-future-release]: ../production/upgrade-or-modify.html#upgrading-to-future-releases
 
 ## Zulip in Docker
 
 Zulip has an officially supported, experimental
-[docker image](https://github.com/zulip/docker-zulip).  Please note
+[docker image](https://github.com/zulip/docker-zulip). Please note
 that Zulip's [normal installer](../production/install.md) has been
 extremely reliable for years, whereas the Docker image is new and has
 rough edges, so we recommend the normal installer unless you have a
@@ -51,21 +51,21 @@ The Zulip installer supports the following advanced installer options
 as well as those mentioned in the
 [install](../production/install.html#installer-options) documentation:
 
-* `--postgresql-version`: Sets the version of PostgreSQL that will be
-  installed.  We currently support PostgreSQL 10, 11, 12, and 13.
+- `--postgresql-version`: Sets the version of PostgreSQL that will be
+  installed. We currently support PostgreSQL 10, 11, 12, and 13.
 
-* `--postgresql-missing-dictionaries`: Set
+- `--postgresql-missing-dictionaries`: Set
   `postgresql.missing_dictionaries` ([docs][doc-settings]) in the
   Zulip settings, which omits some configuration needed for full-text
   indexing. This should be used with [cloud managed databases like
   RDS](#using-zulip-with-amazon-rds-as-the-database). This option
   conflicts with `--no-overwrite-settings`.
 
-* `--no-init-db`: This option instructs the installer to not do any
+- `--no-init-db`: This option instructs the installer to not do any
   database initialization. This should be used when you already have a
   Zulip database.
 
-* `--no-overwrite-settings`: This option preserves existing
+- `--no-overwrite-settings`: This option preserves existing
   `/etc/zulip` configuration files.
 
 ## Running Zulip's service dependencies on different machines
@@ -86,16 +86,16 @@ configuration to be completely modular.
 For example, to install a Zulip Redis server on a machine, you can run
 the following after unpacking a Zulip production release tarball:
 
-```
+```bash
 env PUPPET_CLASSES=zulip::profile::redis ./scripts/setup/install
 ```
 
 All puppet modules under `zulip::profile` are allowed to be configured
-stand-alone on a host.  You can see most likely manifests you might
+stand-alone on a host. You can see most likely manifests you might
 want to choose in the list of includes in [the main manifest for the
 default all-in-one Zulip server][standalone.pp], though it's also
 possible to subclass some of the lower-level manifests defined in that
-directory if you want to customize.  A good example of doing this is
+directory if you want to customize. A good example of doing this is
 in the [zulip_ops Puppet configuration][zulipchat-puppet] that we use
 as part of managing chat.zulip.org and zulip.com.
 
@@ -116,10 +116,10 @@ below.
 #### Step 1: Set up Zulip
 
 Follow the [standard instructions](../production/install.md), with one
-change.  When running the installer, pass the `--no-init-db`
+change. When running the installer, pass the `--no-init-db`
 flag, e.g.:
 
-```
+```bash
 sudo -s  # If not already root
 ./zulip-server-*/scripts/setup/install --certbot \
     --email=YOUR_EMAIL --hostname=YOUR_HOSTNAME \
@@ -130,7 +130,7 @@ The script also installs and starts PostgreSQL on the server by
 default. We don't need it, so run the following command to
 stop and disable the local PostgreSQL server.
 
-```
+```bash
 sudo service postgresql stop
 sudo update-rc.d postgresql disable
 ```
@@ -142,9 +142,9 @@ This complication will be removed in a future version.
 Access an administrative `psql` shell on your PostgreSQL database, and
 run the commands in `scripts/setup/create-db.sql` to:
 
-* Create a database called `zulip`.
-* Create a user called `zulip`.
-* Now log in with the `zulip` user to create a schema called
+- Create a database called `zulip`.
+- Create a user called `zulip`.
+- Now log in with the `zulip` user to create a schema called
   `zulip` in the `zulip` database. You might have to grant `create`
   privileges first for the `zulip` user to do this.
 
@@ -157,23 +157,23 @@ database provider for the available options.
 
 In `/etc/zulip/settings.py` on your Zulip server, configure the
 following settings with details for how to connect to your PostgreSQL
-server.  Your database provider should provide these details.
+server. Your database provider should provide these details.
 
-* `REMOTE_POSTGRES_HOST`: Name or IP address of the PostgreSQL server.
-* `REMOTE_POSTGRES_PORT`: Port on the PostgreSQL server.
-* `REMOTE_POSTGRES_SSLMODE`: SSL Mode used to connect to the server.
+- `REMOTE_POSTGRES_HOST`: Name or IP address of the PostgreSQL server.
+- `REMOTE_POSTGRES_PORT`: Port on the PostgreSQL server.
+- `REMOTE_POSTGRES_SSLMODE`: SSL Mode used to connect to the server.
 
 If you're using password authentication, you should specify the
 password of the `zulip` user in /etc/zulip/zulip-secrets.conf as
 follows:
 
-```
+```ini
 postgres_password = abcd1234
 ```
 
 Now complete the installation by running the following commands.
 
-```
+```bash
 # Ask Zulip installer to initialize the PostgreSQL database.
 su zulip -c '/home/zulip/deployments/current/scripts/setup/initialize-database'
 
@@ -191,61 +191,68 @@ configure that as follows:
    with `/home/zulip/deployments/current/scripts/restart-server`.
 1. Add the following block to `/etc/zulip/zulip.conf`:
 
-    ```
-    [application_server]
-    nginx_listen_port = 12345
-    ```
+   ```ini
+   [application_server]
+   nginx_listen_port = 12345
+   ```
 
 1. As root, run
-  `/home/zulip/deployments/current/scripts/zulip-puppet-apply`.  This
-  will convert Zulip's main `nginx` configuration file to use your new
-  port.
+   `/home/zulip/deployments/current/scripts/zulip-puppet-apply`. This
+   will convert Zulip's main `nginx` configuration file to use your new
+   port.
 
 We also have documentation for a Zulip server [using HTTP][using-http] for use
 behind reverse proxies.
 
 [using-http]: ../production/deployment.html#configuring-zulip-to-allow-http
 
-## Using an outgoing HTTP proxy
+## Customizing the outgoing HTTP proxy
 
-Zulip supports routing all of its outgoing HTTP and HTTPS traffic
-through an HTTP `CONNECT` proxy, such as [Smokescreen][smokescreen];
-this includes outgoing webhooks, image and website previews, and
-mobile push notifications.  You may wish to enable this feature to
-provide a consistent egress point, or enforce access control on URLs
-to prevent [SSRF][ssrf] against internal resources.
+To protect against [SSRF][ssrf], Zulip 4.8 and above default to
+routing all outgoing HTTP and HTTPS traffic through
+[Smokescreen][smokescreen], an HTTP `CONNECT` proxy; this includes
+outgoing webhooks, website previews, and mobile push notifications.
+By default, the Camo image proxy will be automatically configured to
+use a custom outgoing proxy, but does not use Smokescreen by default
+because Camo includes similar logic to deny access to private
+subnets. You can [override][proxy.enable_for_camo] this default
+configuration if desired.
 
-To use Smokescreen:
-
-1. Add `, zulip::profile::smokescreen` to the list of `puppet_classes`
-   in `/etc/zulip/zulip.conf`.  A typical value after this change is:
-    ```
-    puppet_classes = zulip::profile::standalone, zulip::profile::smokescreen
-    ```
-
-1. Optionally, configure the [smokescreen ACLs][smokescreen-acls]. By
-  default, Smokescreen denies access to all [non-public IP
-  addresses](https://en.wikipedia.org/wiki/Private_network), including
-  127.0.0.1.
+To use a custom outgoing proxy:
 
 1. Add the following block to `/etc/zulip/zulip.conf`, substituting in
    your proxy's hostname/IP and port:
 
-    ```
-    [http_proxy]
-    host = 127.0.0.1
-    port = 4750
-    ```
+   ```ini
+   [http_proxy]
+   host = 127.0.0.1
+   port = 4750
+   ```
 
 1. As root, run
-   `/home/zulip/deployments/current/scripts/zulip-puppet-apply`.  This
-   will compile and install Smokescreen, reconfigure services to use
-   it, and restart Zulip.
+   `/home/zulip/deployments/current/scripts/zulip-puppet-apply`. This
+   will reconfigure and restart Zulip.
 
-If you would like to use an already-installed HTTP proxy, omit the
-first step, and adjust the IP address and port in the second step
-accordingly.
+If you have a deployment with multiple frontend servers, or wish to
+install Smokescreen on a separate host, you can apply the
+`zulip::profile::smokescreen` Puppet class on that host, and follow
+the above steps, setting the `[http_proxy]` block to point to that
+host.
 
+If you wish to disable the outgoing proxy entirely, follow the above
+steps, configuring an empty `host` value.
+
+Optionally, you can also configure the [Smokescreen ACL
+list][smokescreen-acls]. By default, Smokescreen denies access to all
+[non-public IP
+addresses](https://en.wikipedia.org/wiki/Private_network), including
+127.0.0.1, but allows traffic to all public Internet hosts.
+
+In Zulip 4.7 and older, to enable SSRF protection via Smokescreen, you
+will need to explicitly add the `zulip::profile::smokescreen` Puppet
+class, and configure the `[http_proxy]` block as above.
+
+[proxy.enable_for_camo]: #enable-for-camo
 [smokescreen]: https://github.com/stripe/smokescreen
 [smokescreen-acls]: https://github.com/stripe/smokescreen#acls
 [ssrf]: https://owasp.org/www-community/attacks/Server_Side_Request_Forgery
@@ -275,31 +282,59 @@ HTTP as follows:
 
 1. Add the following block to `/etc/zulip/zulip.conf`:
 
-    ```
-    [application_server]
-    http_only = true
-    ```
+   ```ini
+   [application_server]
+   http_only = true
+   ```
 
 1. As root, run
-`/home/zulip/deployments/current/scripts/zulip-puppet-apply`.  This
-will convert Zulip's main `nginx` configuration file to allow HTTP
-instead of HTTPS.
+   `/home/zulip/deployments/current/scripts/zulip-puppet-apply`. This
+   will convert Zulip's main `nginx` configuration file to allow HTTP
+   instead of HTTPS.
 
 1. Finally, restart the Zulip server, using
-`/home/zulip/deployments/current/scripts/restart-server`.
+   `/home/zulip/deployments/current/scripts/restart-server`.
+
+#### Configuring Zulip to trust proxies
+
+Before placing Zulip behind a reverse proxy, it needs to be configured to trust
+the client IP addresses that the proxy reports. This is important to have
+accurate IP addresses in server logs, as well as in notification emails which
+are sent to end users.
+
+1. Determine the IP addresses of all reverse proxies you are setting up, as seen
+   from the Zulip host. Depending on your network setup, these may not be the
+   same as the public IP addresses of the reverse proxies.
+
+1. Add the following block to `/etc/zulip/zulip.conf`.
+
+   ```ini
+   [loadbalancer]
+   # Use the IP addresses you determined above, separated by commas.
+   ips = 192.168.0.100
+   ```
+
+1. Reconfigure Zulip with these settings. As root, run
+   `/home/zulip/deployments/current/scripts/zulip-puppet-apply`. This will
+   adjust Zulip's `nginx` configuration file to accept the `X-Forwarded-For`
+   header when it is sent from one of the reverse proxy IPs.
+
+1. Finally, restart the Zulip server, using
+   `/home/zulip/deployments/current/scripts/restart-server`.
 
 ### nginx configuration
 
 For `nginx` configuration, there's two things you need to set up:
-* The root `nginx.conf` file.  We recommend using
+
+- The root `nginx.conf` file. We recommend using
   `/etc/nginx/nginx.conf` from your Zulip server for our recommended
-  settings.  E.g. if you don't set `client_max_body_size`, it won't be
+  settings. E.g. if you don't set `client_max_body_size`, it won't be
   possible to upload large files to your Zulip server.
-* The `nginx` site-specific configuration (in
-  `/etc/nginx/sites-available`) for the Zulip app.  The following
+- The `nginx` site-specific configuration (in
+  `/etc/nginx/sites-available`) for the Zulip app. The following
   example is a good starting point:
 
-```
+```nginx
 server {
         listen                  443 ssl http2;
         listen                  [::]:443 ssl http2;
@@ -323,9 +358,13 @@ Don't forget to update `server_name`, `ssl_certificate`,
 `ssl_certificate_key` and `proxy_pass` with the appropriate values for
 your installation.
 
-[nginx-proxy-longpolling-config]: https://github.com/zulip/zulip/blob/master/puppet/zulip/files/nginx/zulip-include-common/proxy_longpolling
-[standalone.pp]: https://github.com/zulip/zulip/blob/master/puppet/zulip/manifests/profile/standalone.pp
-[zulipchat-puppet]: https://github.com/zulip/zulip/tree/master/puppet/zulip_ops/manifests
+On the Zulip side, you will need to add the `nginx` server IP as a trusted
+reverse proxy. Follow the instructions to [configure Zulip to trust
+proxies](#configuring-zulip-to-trust-proxies).
+
+[nginx-proxy-longpolling-config]: https://github.com/zulip/zulip/blob/main/puppet/zulip/files/nginx/zulip-include-common/proxy_longpolling
+[standalone.pp]: https://github.com/zulip/zulip/blob/main/puppet/zulip/manifests/profile/standalone.pp
+[zulipchat-puppet]: https://github.com/zulip/zulip/tree/main/puppet/zulip_ops/manifests
 
 ### Apache2 configuration
 
@@ -336,64 +375,68 @@ make the following changes in two configuration files.
 1. Follow the instructions for [Configure Zulip to allow HTTP](#configuring-zulip-to-allow-http).
 
 2. Add the following to `/etc/zulip/settings.py`:
-    ```
-    EXTERNAL_HOST = 'zulip.example.com'
-    ALLOWED_HOSTS = ['zulip.example.com', '127.0.0.1']
-    USE_X_FORWARDED_HOST = True
-    ```
 
+   ```python
+   EXTERNAL_HOST = 'zulip.example.com'
+   ALLOWED_HOSTS = ['zulip.example.com', '127.0.0.1']
+   USE_X_FORWARDED_HOST = True
+   ```
 
 3. Restart your Zulip server with `/home/zulip/deployments/current/scripts/restart-server`.
 
-4. Create an Apache2 virtual host configuration file, similar to the
-   following.  Place it the appropriate path for your Apache2
+4. Follow the instructions to [configure Zulip to trust
+   proxies](#configuring-zulip-to-trust-proxies). For this example, the reverse
+   proxy IP would be `127.0.0.1`.
+
+5. Create an Apache2 virtual host configuration file, similar to the
+   following. Place it the appropriate path for your Apache2
    installation and enable it (E.g. if you use Debian or Ubuntu, then
    place it in `/etc/apache2/sites-available/zulip.example.com.conf`
-   and then run `a2ensite zulip.example.com && systemctl reload
-   apache2`):
+   and then run
+   `a2ensite zulip.example.com && systemctl reload apache2`):
 
-    ```
-    <VirtualHost *:80>
-        ServerName zulip.example.com
-        RewriteEngine On
-        RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
-    </VirtualHost>
+   ```apache
+   <VirtualHost *:80>
+       ServerName zulip.example.com
+       RewriteEngine On
+       RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
+   </VirtualHost>
 
-    <VirtualHost *:443>
-      ServerName zulip.example.com
+   <VirtualHost *:443>
+     ServerName zulip.example.com
 
-      RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
-      RequestHeader set "X-Forwarded-SSL" expr=%{HTTPS}
+     RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
+     RequestHeader set "X-Forwarded-SSL" expr=%{HTTPS}
 
-      RewriteEngine On
-      RewriteRule /(.*)           http://localhost:5080/$1 [P,L]
+     RewriteEngine On
+     RewriteRule /(.*)           http://localhost:5080/$1 [P,L]
 
-      <Location />
-        Require all granted
-        ProxyPass  http://localhost:5080/  timeout=300
-        ProxyPassReverse  http://localhost:5080/
-        ProxyPassReverseCookieDomain  127.0.0.1  zulip.example.com
-      </Location>
+     <Location />
+       Require all granted
+       ProxyPass  http://localhost:5080/  timeout=300
+       ProxyPassReverse  http://localhost:5080/
+       ProxyPassReverseCookieDomain  127.0.0.1  zulip.example.com
+     </Location>
 
-      SSLEngine on
-      SSLProxyEngine on
-      SSLCertificateFile /etc/letsencrypt/live/zulip.example.com/fullchain.pem
-      SSLCertificateKeyFile /etc/letsencrypt/live/zulip.example.com/privkey.pem
-      SSLOpenSSLConfCmd DHParameters "/etc/nginx/dhparam.pem"
-      SSLProtocol all -SSLv3 -TLSv1 -TLSv1.1
-      SSLCipherSuite ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
-      SSLHonorCipherOrder off
-      SSLSessionTickets off
-      Header set Strict-Transport-Security "max-age=31536000"
-    </VirtualHost>
-    ```
+     SSLEngine on
+     SSLProxyEngine on
+     SSLCertificateFile /etc/letsencrypt/live/zulip.example.com/fullchain.pem
+     SSLCertificateKeyFile /etc/letsencrypt/live/zulip.example.com/privkey.pem
+     SSLOpenSSLConfCmd DHParameters "/etc/nginx/dhparam.pem"
+     SSLProtocol all -SSLv3 -TLSv1 -TLSv1.1
+     SSLCipherSuite ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
+     SSLHonorCipherOrder off
+     SSLSessionTickets off
+     Header set Strict-Transport-Security "max-age=31536000"
+   </VirtualHost>
+   ```
 
 ### HAProxy configuration
 
 If you want to use HAProxy with Zulip, this `backend` config is a good
 place to start.
 
-```
+```text
 backend zulip
     mode http
     balance leastconn
@@ -403,7 +446,9 @@ backend zulip
 
 Since this configuration uses the `http` mode, you will also need to
 [configure Zulip to allow HTTP](#configuring-zulip-to-allow-http) as
-described above.
+described above. Additionally, you will need to [add the the HAProxy server IP
+address as a trusted load balancer](#configuring-zulip-to-trust-proxies)
+to have Zulip respect the addresses in `X-Forwarded-For` headers.
 
 ### Other proxies
 
@@ -411,40 +456,41 @@ If you're using another reverse proxy implementation, there are few
 things you need to be careful about when configuring it:
 
 1. Configure your reverse proxy (or proxies) to correctly maintain the
-`X-Forwarded-For` HTTP header, which is supposed to contain the series
-of IP addresses the request was forwarded through.  You can verify
-your work by looking at `/var/log/zulip/server.log` and checking it
-has the actual IP addresses of clients, not the IP address of the
-proxy server.
+   `X-Forwarded-For` HTTP header, which is supposed to contain the series
+   of IP addresses the request was forwarded through. Additionally,
+   [configure Zulip to respect the addresses sent by your reverse
+   proxies](#configuring-zulip-to-trust-proxies). You can verify
+   your work by looking at `/var/log/zulip/server.log` and checking it
+   has the actual IP addresses of clients, not the IP address of the
+   proxy server.
 
 2. Ensure your proxy doesn't interfere with Zulip's use of
-long-polling for real-time push from the server to your users'
-browsers.  This [nginx code snippet][nginx-proxy-longpolling-config]
-does this.
+   long-polling for real-time push from the server to your users'
+   browsers. This [nginx code snippet][nginx-proxy-longpolling-config]
+   does this.
 
 The key configuration options are, for the `/json/events` and
 `/api/1/events` endpoints:
 
-* `proxy_read_timeout 1200;`.  It's critical that this be
+- `proxy_read_timeout 1200;`. It's critical that this be
   significantly above 60s, but the precise value isn't important.
-* `proxy_buffering off`.  If you don't do this, your `nginx` proxy may
+- `proxy_buffering off`. If you don't do this, your `nginx` proxy may
   return occasional 502 errors to clients using Zulip's events API.
 
 3. The other tricky failure mode we've seen with `nginx` reverse
-proxies is that they can load-balance between the IPv4 and IPv6
-addresses for a given hostname.  This can result in mysterious errors
-that can be quite difficult to debug.  Be sure to declare your
-`upstreams` equivalent in a way that won't do load-balancing
-unexpectedly (e.g. pointing to a DNS name that you haven't configured
-with multiple IPs for your Zulip machine; sometimes this happens with
-IPv6 configuration).
-
+   proxies is that they can load-balance between the IPv4 and IPv6
+   addresses for a given hostname. This can result in mysterious errors
+   that can be quite difficult to debug. Be sure to declare your
+   `upstreams` equivalent in a way that won't do load-balancing
+   unexpectedly (e.g. pointing to a DNS name that you haven't configured
+   with multiple IPs for your Zulip machine; sometimes this happens with
+   IPv6 configuration).
 
 ## System and deployment configuration
 
 The file `/etc/zulip/zulip.conf` is used to configure properties of
 the system and deployment; `/etc/zulip/settings.py` is used to
-configure the application itself.  The `zulip.conf` sections and
+configure the application itself. The `zulip.conf` sections and
 settings are described below.
 
 ### `[machine]`
@@ -456,11 +502,12 @@ The most common is **`zulip::profile::standalone`**, used for a
 stand-alone single-host deployment.
 [Components](../overview/architecture-overview.html#components) of
 that include:
- - **`zulip::profile::app_frontend`**
- - **`zulip::profile::memcached`**
- - **`zulip::profile::postgresql`**
- - **`zulip::profile::redis`**
- - **`zulip::profile::rabbitmq`**
+
+- **`zulip::profile::app_frontend`**
+- **`zulip::profile::memcached`**
+- **`zulip::profile::postgresql`**
+- **`zulip::profile::redis`**
+- **`zulip::profile::rabbitmq`**
 
 If you are using a [Apache as a single-sign-on
 authenticator](../production/authentication-methods.html#apache-based-sso-with-remote-user),
@@ -472,21 +519,19 @@ Set to the string `enabled` if enabling the [multi-language PGroonga
 search
 extension](../subsystems/full-text-search.html#multi-language-full-text-search).
 
-
-
 ### `[deployment]`
 
 #### `deploy_options`
 
 Options passed by `upgrade-zulip` and `upgrade-zulip-from-git` into
-`upgrade-zulip-stage-2`.  These might be any of:
+`upgrade-zulip-stage-2`. These might be any of:
 
- - **`--skip-puppet`** skips doing Puppet/apt upgrades.  The user will need
-   to run `zulip-puppet-apply` manually after the upgrade.
- - **`--skip-migrations`** skips running database migrations.  The
-   user will need to run `./manage.py migrate` manually after the upgrade.
- - **`--skip-purge-old-deployments`** skips purging old deployments;
-   without it, only deployments with the last two weeks are kept.
+- **`--skip-puppet`** skips doing Puppet/apt upgrades. The user will need
+  to run `zulip-puppet-apply` manually after the upgrade.
+- **`--skip-migrations`** skips running database migrations. The
+  user will need to run `./manage.py migrate` manually after the upgrade.
+- **`--skip-purge-old-deployments`** skips purging old deployments;
+  without it, only deployments with the last two weeks are kept.
 
 Generally installations will not want to set any of these options; the
 `--skip-*` options are primarily useful for reducing upgrade downtime
@@ -497,8 +542,6 @@ for servers that are upgraded frequently by core Zulip developers.
 Default repository URL used when [upgrading from a Git
 repository](../production/upgrade-or-modify.html#upgrading-from-a-git-repository).
 
-
-
 ### `[application_server]`
 
 #### `http_only`
@@ -530,7 +573,7 @@ mode). The calculation is based on whether the system has enough
 memory (currently 3.5GiB) to run a single-server Zulip installation in
 the multiprocess mode.
 
-Set to `true` or `false` to override the automatic calculation.  This
+Set to `true` or `false` to override the automatic calculation. This
 override is useful both Docker systems (where the above algorithm
 might see the host's memory, not the container's) and/or when using
 remote servers for postgres, memcached, redis, and RabbitMQ.
@@ -548,18 +591,6 @@ Override the default uwsgi backlog of 128 connections.
 Override the default `uwsgi` (Django) process count of 6 on hosts with
 more than 3.5GiB of RAM, 4 on hosts with less.
 
-
-
-### `[certbot]`
-
-#### `auto_renew`
-
-If set to the string `yes`, [Certbot will attempt to automatically
-renew its certificate](../production/ssl-certificates.html#certbot-recommended).  Do
-no set by hand; use `scripts/setup/setup-certbot` to configure this.
-
-
-
 ### `[postfix]`
 
 #### `mailname`
@@ -607,19 +638,9 @@ connections.
 
 #### `version`
 
-The version of PostgreSQL that is in use.  Do not set by hand; use the
+The version of PostgreSQL that is in use. Do not set by hand; use the
 [PostgreSQL upgrade tool](../production/upgrade-or-modify.html#upgrading-postgresql).
 
-
-
-### `[rabbitmq]`
-
-#### `nodename`
-
-The name used to identify the local RabbitMQ server; do not modify.
-
-
-
 ### `[memcached]`
 
 #### `memory`
@@ -627,8 +648,6 @@ The name used to identify the local RabbitMQ server; do not modify.
 Override the number of megabytes of memory that memcached should be
 configured to consume; defaults to 1/8th of the total server memory.
 
-
-
 ### `[loadbalancer]`
 
 #### `ips`
@@ -636,15 +655,27 @@ configured to consume; defaults to 1/8th of the total server memory.
 Comma-separated list of IP addresses or netmasks of external
 load balancers whose `X-Forwarded-For` should be respected.
 
-
-
 ### `[http_proxy]`
 
 #### `host`
 
 The hostname or IP address of an [outgoing HTTP `CONNECT`
-proxy](#using-an-outgoing-http-proxy).
+proxy](#customizing-the-outgoing-http-proxy). Defaults to `localhost`
+if unspecified.
 
 #### `port`
 
 The TCP port of the HTTP `CONNECT` proxy on the host specified above.
+Defaults to `4750` if unspecified.
+
+#### `listen_address`
+
+The IP address that Smokescreen should bind to and listen on.
+Defaults to `127.0.0.1`.
+
+#### `enable_for_camo`
+
+Because Camo includes logic to deny access to private subnets, routing
+its requests through Smokescreen is generally not necessary. Set to
+'true' or 'false' to override the default, which uses the proxy only if
+it is not the default of Smokescreen on a local host.

docs/production/email-gateway.md

@@ -1,42 +1,42 @@
 # Incoming email integration
 
 Zulip's incoming email gateway integration makes it possible to send
-messages into Zulip by sending an email.  It's highly recommended
+messages into Zulip by sending an email. It's highly recommended
 because it enables:
 
-* When users reply to one of Zulip's message notification emails
+- When users reply to one of Zulip's message notification emails
   from their email client, the reply can go directly
   into Zulip.
-* Integrating third-party services that can send email notifications
-  into Zulip.  See the [integration
+- Integrating third-party services that can send email notifications
+  into Zulip. See the [integration
   documentation](https://zulip.com/integrations/doc/email) for
   details.
 
 Once this integration is configured, each stream will have a special
-email address displayed on the stream settings page.  Emails sent to
+email address displayed on the stream settings page. Emails sent to
 that address will be delivered into the stream.
 
 There are two ways to configure Zulip's email gateway:
 
-  1. Local delivery (recommended): A postfix server runs on the Zulip
-    server and passes the emails directly to Zulip.
-  1. Polling: A cron job running on the Zulip server checks an IMAP
-    inbox (`username@example.com`) every minute for new emails.
+1. Local delivery (recommended): A postfix server runs on the Zulip
+   server and passes the emails directly to Zulip.
+1. Polling: A cron job running on the Zulip server checks an IMAP
+   inbox (`username@example.com`) every minute for new emails.
 
 The local delivery configuration is preferred for production because
-it supports nicer looking email addresses and has no cron delay.  The
+it supports nicer looking email addresses and has no cron delay. The
 polling option is convenient for testing/developing this feature
 because it doesn't require a public IP address or setting up MX
 records in DNS.
 
-```eval_rst
-   .. note::
-       Incoming emails are rate-limited, with the following limits:
+:::{note}
+Incoming emails are rate-limited, with the following limits:
 
-       * 50 emails per minute.
-       * 120 emails per 5 minutes.
-       * 600 emails per hour.
-   ```
+- 50 emails per minute.
+- 120 emails per 5 minutes.
+- 600 emails per hour.
+
+:::
 
 ## Local delivery setup
 
@@ -45,7 +45,7 @@ integration; you just need to enable and configure it as follows.
 
 The main decision you need to make is what email domain you want to
 use for the gateway; for this discussion we'll use
-`emaildomain.example.com`.  The email addresses used by the gateway
+`emaildomain.example.com`. The email addresses used by the gateway
 will look like `foo@emaildomain.example.com`, so we recommend using
 `EXTERNAL_HOST` here.
 
@@ -55,33 +55,34 @@ using an [HTTP reverse proxy][reverse-proxy]).
 
 1. Using your DNS provider, create a DNS MX (mail exchange) record
    configuring email for `emaildomain.example.com` to be processed by
-   `hostname.example.com`.  You can check your work using this command:
+   `hostname.example.com`. You can check your work using this command:
 
-    ```
-    $ dig +short emaildomain.example.com -t MX
-    1 hostname.example.com
-    ```
+   ```console
+   $ dig +short emaildomain.example.com -t MX
+   1 hostname.example.com
+   ```
 
 1. Log in to your Zulip server; the remaining steps all happen there.
 
 1. Add `, zulip::postfix_localmail` to `puppet_classes` in
-   `/etc/zulip/zulip.conf`.  A typical value after this change is:
-   ```
+   `/etc/zulip/zulip.conf`. A typical value after this change is:
+
+   ```ini
    puppet_classes = zulip::profile::standalone, zulip::postfix_localmail
    ```
 
-1.  If `hostname.example.com` is different from
+1. If `hostname.example.com` is different from
    `emaildomain.example.com`, add a section to `/etc/zulip/zulip.conf`
    on your Zulip server like this:
 
-    ```
-    [postfix]
-    mailname = emaildomain.example.com
-    ```
+   ```ini
+   [postfix]
+   mailname = emaildomain.example.com
+   ```
 
-    This tells postfix to expect to receive emails at addresses ending
-    with `@emaildomain.example.com`, overriding the default of
-    `@hostname.example.com`.
+   This tells postfix to expect to receive emails at addresses ending
+   with `@emaildomain.example.com`, overriding the default of
+   `@hostname.example.com`.
 
 1. Run `/home/zulip/deployments/current/scripts/zulip-puppet-apply`
    (and answer `y`) to apply your new `/etc/zulip/zulip.conf`
@@ -93,33 +94,34 @@ using an [HTTP reverse proxy][reverse-proxy]).
 1. Restart your Zulip server with
    `/home/zulip/deployments/current/scripts/restart-server`.
 
-Congratulations!  The integration should be fully operational.
+Congratulations! The integration should be fully operational.
 
 [reverse-proxy]: ../production/deployment.html#putting-the-zulip-application-behind-a-reverse-proxy
 
 ## Polling setup
 
 1. Create an email account dedicated to Zulip's email gateway
-  messages.  We assume the address is of the form
-  `username@example.com`.  The email provider needs to support the
-  standard model of delivering emails sent to
-  `username+stuff@example.com` to the `username@example.com` inbox.
+   messages. We assume the address is of the form
+   `username@example.com`. The email provider needs to support the
+   standard model of delivering emails sent to
+   `username+stuff@example.com` to the `username@example.com` inbox.
 
 1. Edit `/etc/zulip/settings.py`, and set `EMAIL_GATEWAY_PATTERN` to
    `"username+%s@example.com"`.
 
 1. Set up IMAP for your email account and obtain the authentication details.
-  ([Here's how it works with Gmail](https://support.google.com/mail/answer/7126229?hl=en))
+   ([Here's how it works with Gmail](https://support.google.com/mail/answer/7126229?hl=en))
 
 1. Configure IMAP access in the appropriate Zulip settings:
-    * Login and server connection details in `/etc/zulip/settings.py`
-      in the email gateway integration section (`EMAIL_GATEWAY_LOGIN` and others).
-    * Password in `/etc/zulip/zulip-secrets.conf` as `email_gateway_password`.
+
+   - Login and server connection details in `/etc/zulip/settings.py`
+     in the email gateway integration section (`EMAIL_GATEWAY_LOGIN` and others).
+   - Password in `/etc/zulip/zulip-secrets.conf` as `email_gateway_password`.
 
 1. Install a cron job to poll the inbox every minute for new messages:
-    ```
-    cd /home/zulip/deployments/current/
-    sudo cp puppet/zulip/files/cron.d/email-mirror /etc/cron.d/
-    ```
+   ```bash
+   cd /home/zulip/deployments/current/
+   sudo cp puppet/zulip/files/cron.d/email-mirror /etc/cron.d/
+   ```
 
-Congratulations!  The integration should be fully operational.
+Congratulations! The integration should be fully operational.

docs/production/email.md

@@ -6,13 +6,13 @@ email addresses and send notifications.
 ## How to configure
 
 1. Identify an outgoing email (SMTP) account where you can have Zulip
-   send mail.  If you don't already have one you want to use, see
+   send mail. If you don't already have one you want to use, see
    [Email services](#email-services) below.
 
 1. Fill out the section of `/etc/zulip/settings.py` headed "Outgoing
-   email (SMTP) settings".  This includes the hostname and typically
+   email (SMTP) settings". This includes the hostname and typically
    the port to reach your SMTP provider, and the username to log in to
-   it.  You'll also want to fill out the noreply email section.
+   it. You'll also want to fill out the noreply email section.
 
 1. Put the password for the SMTP user account in
    `/etc/zulip/zulip-secrets.conf` by setting `email_password`. For
@@ -57,18 +57,18 @@ the best documentation).
 
 If you don't have an existing outgoing SMTP provider, don't worry!
 Each of the options we recommend above (as well as dozens of other
-services) have free options.  Once you've signed up, you'll want to
+services) have free options. Once you've signed up, you'll want to
 find the service's provided "SMTP credentials", and configure Zulip as
 follows:
 
-* The hostname like `EMAIL_HOST = 'smtp.mailgun.org'` in `/etc/zulip/settings.py`
-* The username like `EMAIL_HOST_USER = 'username@example.com'` in
+- The hostname like `EMAIL_HOST = 'smtp.mailgun.org'` in `/etc/zulip/settings.py`
+- The username like `EMAIL_HOST_USER = 'username@example.com'` in
   `/etc/zulip/settings.py`.
-* The TLS setting as `EMAIL_USE_TLS = True` in
+- The TLS setting as `EMAIL_USE_TLS = True` in
   `/etc/zulip/settings.py`, for most providers
-* The port as `EMAIL_PORT = 587` in `/etc/zulip/settings.py`, for most
+- The port as `EMAIL_PORT = 587` in `/etc/zulip/settings.py`, for most
   providers
-* The password like `email_password = abcd1234` in `/etc/zulip/zulip-secrets.conf`.
+- The password like `email_password = abcd1234` in `/etc/zulip/zulip-secrets.conf`.
 
 ### Using system email
 
@@ -78,7 +78,7 @@ configuration on the system that forwards email sent locally into your
 corporate email system), you will likely need to use something like
 these setting values:
 
-```
+```python
 EMAIL_HOST = 'localhost'
 EMAIL_PORT = 25
 EMAIL_USE_TLS = False
@@ -88,7 +88,7 @@ EMAIL_HOST_USER = ""
 We should emphasize that because modern spam filtering is very
 aggressive, you should make sure your downstream email system is
 configured to properly sign outgoing email sent by your Zulip server
-(or check your spam folder) when using this configuration.  See
+(or check your spam folder) when using this configuration. See
 [documentation on using Django with a local postfix server][postfix-email]
 for additional advice.
 
@@ -97,32 +97,33 @@ for additional advice.
 ### Using Gmail for outgoing email
 
 We don't recommend using an inbox product like Gmail for outgoing
-email, because Gmail's anti-spam measures make this annoying.  But if
+email, because Gmail's anti-spam measures make this annoying. But if
 you want to use a Gmail account to send outgoing email anyway, here's
 how to make it work:
-* Create a totally new Gmail account for your Zulip server; you don't
+
+- Create a totally new Gmail account for your Zulip server; you don't
   want Zulip's automated emails to come from your personal email address.
-* If you're using 2-factor authentication on the Gmail account, you'll
+- If you're using 2-factor authentication on the Gmail account, you'll
   need to use an
   [app-specific password](https://support.google.com/accounts/answer/185833).
-* If you're not using 2-factor authentication, read this Google
+- If you're not using 2-factor authentication, read this Google
   support answer and configure that account as
   ["less secure"](https://support.google.com/accounts/answer/6010255);
   Gmail doesn't allow servers to send outgoing email by default.
-* Note also that the rate limits for Gmail are also quite low
+- Note also that the rate limits for Gmail are also quite low
   (e.g. 100 / day), so it's easy to get rate-limited if your server
-  has significant traffic.  For more active servers, we recommend
+  has significant traffic. For more active servers, we recommend
   moving to a free account on a transactional email service.
 
 ### Logging outgoing email to a file for prototyping
 
 For prototyping, you might want to proceed without setting up an email
-provider.  If you want to see the emails Zulip would have sent, you
+provider. If you want to see the emails Zulip would have sent, you
 can log them to a file instead.
 
 To do so, add these lines to `/etc/zulip/settings.py`:
 
-```
+```python
 EMAIL_BACKEND = 'django.core.mail.backends.filebased.EmailBackend'
 EMAIL_FILE_PATH = '/var/log/zulip/emails'
 ```
@@ -137,22 +138,22 @@ later set up a real SMTP provider!
 
 You can quickly test your outgoing email configuration using:
 
-```
+```bash
 su zulip -c '/home/zulip/deployments/current/manage.py send_test_email user@example.com'
 ```
 
 If it doesn't throw an error, it probably worked; you can confirm by
-checking your email.  You should get two emails: One sent by the
+checking your email. You should get two emails: One sent by the
 default From address for your Zulip server, and one sent by the
 "noreply" From address.
 
 If it doesn't work, check these common failure causes:
 
-* Your hosting provider may block outgoing SMTP traffic in its default
-  firewall rules.  Check whether the port `EMAIL_PORT` is blocked in
+- Your hosting provider may block outgoing SMTP traffic in its default
+  firewall rules. Check whether the port `EMAIL_PORT` is blocked in
   your hosting provider's firewall.
 
-* Your SMTP server's permissions might not allow the email account
+- Your SMTP server's permissions might not allow the email account
   you're using to send email from the `noreply` email addresses used
   by Zulip when sending confirmation emails.
 
@@ -162,19 +163,19 @@ If it doesn't work, check these common failure causes:
 
   If necessary, you can set `ADD_TOKENS_TO_NOREPLY_ADDRESS` to `False`
   in `/etc/zulip/settings.py` (which will cause these confirmation
-  emails to be sent from a consistent `noreply@` address).  Disabling
+  emails to be sent from a consistent `noreply@` address). Disabling
   `ADD_TOKENS_TO_NOREPLY_ADDRESS` is generally safe if you are not
   using Zulip's feature that allows anyone to create an account in
   your Zulip organization if they have access to an email address in a
-  certain domain.  See [this article][helpdesk-attack] for details on
+  certain domain. See [this article][helpdesk-attack] for details on
   the security issue with helpdesk software that
   `ADD_TOKENS_TO_NOREPLY_ADDRESS` helps protect against.
 
-* Make sure you set the password in `/etc/zulip/zulip-secrets.conf`.
+- Make sure you set the password in `/etc/zulip/zulip-secrets.conf`.
 
-* Check the username and password for typos.
+- Check the username and password for typos.
 
-* Be sure to restart your Zulip server after editing either
+- Be sure to restart your Zulip server after editing either
   `settings.py` or `zulip-secrets.conf`, using
   `/home/zulip/deployments/current/scripts/restart-server` .
   Note that the `manage.py` command above will read the latest
@@ -186,33 +187,33 @@ If it doesn't work, check these common failure causes:
 Here are a few final notes on what to look at when debugging why you
 aren't receiving emails from Zulip:
 
-* Most transactional email services have an "outgoing email" log where
+- Most transactional email services have an "outgoing email" log where
   you can inspect the emails that reached the service, whether an
   email was flagged as spam, etc.
 
-* Starting with Zulip 1.7, Zulip logs an entry in
+- Starting with Zulip 1.7, Zulip logs an entry in
   `/var/log/zulip/send_email.log` whenever it attempts to send an
-  email.  The log entry includes whether the request succeeded or failed.
+  email. The log entry includes whether the request succeeded or failed.
 
-* If attempting to send an email throws an exception, a traceback
+- If attempting to send an email throws an exception, a traceback
   should be in `/var/log/zulip/errors.log`, along with any other
   exceptions Zulip encounters.
 
-* If your SMTP provider uses SSL on port 465 (and not TLS on port
+- If your SMTP provider uses SSL on port 465 (and not TLS on port
   587), you need to set `EMAIL_PORT = 465` as well as replacing
   `EMAIL_USE_TLS = True` with `EMAIL_USE_SSL = True`; otherwise, Zulip
   will try to use the TLS protocol on port 465, which won't work.
 
-* Zulip's email sending configuration is based on the standard Django
+- Zulip's email sending configuration is based on the standard Django
   [SMTP backend](https://docs.djangoproject.com/en/2.0/topics/email/#smtp-backend)
-  configuration.  So if you're having trouble getting your email
+  configuration. So if you're having trouble getting your email
   provider working, you may want to search for documentation related
   to using your email provider with Django.
 
   The one thing we've changed from the Django defaults is that we read
   the email password from the `email_password` entry in the Zulip
   secrets file, as part of our policy of not having any secret
-  information in the `/etc/zulip/settings.py` file.  In other words,
+  information in the `/etc/zulip/settings.py` file. In other words,
   if Django documentation references setting `EMAIL_HOST_PASSWORD`,
   you should instead set `email_password` in
   `/etc/zulip/zulip-secrets.conf`.

docs/production/expensive-migrations.md

@@ -1,4 +1,4 @@
-```eval_rst
+```{eval-rst}
 :orphan:
 ```
 
@@ -8,61 +8,65 @@ Zulip 1.7 and 1.9 each contain some significant database migrations
 that can take several minutes to run.
 
 The upgrade process automatically minimizes disruption by running
-these first, before beginning the user-facing downtime.  However, if
+these first, before beginning the user-facing downtime. However, if
 you'd like to watch the downtime phase of the upgrade closely, you
 can run them manually before starting the upgrade:
 
 1. Log in to your Zulip server as the `zulip` user (or as `root` and
-  then run `su zulip` to drop privileges), and `cd
-  /home/zulip/deployments/current`
-2. Run `./manage.py dbshell`.  This will open a shell connected to the
-  PostgreSQL database.
+   then run `su zulip` to drop privileges), and
+   `cd /home/zulip/deployments/current`
+2. Run `./manage.py dbshell`. This will open a shell connected to the
+   PostgreSQL database.
 3. In the PostgreSQL shell, run the following commands:
 
-        CREATE INDEX CONCURRENTLY
-        zerver_usermessage_is_private_message_id
-        ON zerver_usermessage (user_profile_id, message_id)
-        WHERE (flags & 2048) != 0;
+   ```postgresql
+   CREATE INDEX CONCURRENTLY
+   zerver_usermessage_is_private_message_id
+   ON zerver_usermessage (user_profile_id, message_id)
+   WHERE (flags & 2048) != 0;
 
-        CREATE INDEX CONCURRENTLY
-        zerver_usermessage_active_mobile_push_notification_id
-        ON zerver_usermessage (user_profile_id, message_id)
-        WHERE (flags & 4096) != 0;
+   CREATE INDEX CONCURRENTLY
+   zerver_usermessage_active_mobile_push_notification_id
+   ON zerver_usermessage (user_profile_id, message_id)
+   WHERE (flags & 4096) != 0;
+   ```
 
-(These first migrations are the only new ones in Zulip 1.9).
+   (These first migrations are the only new ones in Zulip 1.9).
 
-        CREATE INDEX CONCURRENTLY
-        zerver_usermessage_mentioned_message_id
-        ON zerver_usermessage (user_profile_id, message_id)
-        WHERE (flags & 8) != 0;
+   ```postgresql
+   CREATE INDEX CONCURRENTLY
+   zerver_usermessage_mentioned_message_id
+   ON zerver_usermessage (user_profile_id, message_id)
+   WHERE (flags & 8) != 0;
 
-        CREATE INDEX CONCURRENTLY
-        zerver_usermessage_starred_message_id
-        ON zerver_usermessage (user_profile_id, message_id)
-        WHERE (flags & 2) != 0;
+   CREATE INDEX CONCURRENTLY
+   zerver_usermessage_starred_message_id
+   ON zerver_usermessage (user_profile_id, message_id)
+   WHERE (flags & 2) != 0;
 
-        CREATE INDEX CONCURRENTLY
-        zerver_usermessage_has_alert_word_message_id
-        ON zerver_usermessage (user_profile_id, message_id)
-        WHERE (flags & 512) != 0;
+   CREATE INDEX CONCURRENTLY
+   zerver_usermessage_has_alert_word_message_id
+   ON zerver_usermessage (user_profile_id, message_id)
+   WHERE (flags & 512) != 0;
 
-        CREATE INDEX CONCURRENTLY
-        zerver_usermessage_wildcard_mentioned_message_id
-        ON zerver_usermessage (user_profile_id, message_id)
-        WHERE (flags & 8) != 0 OR (flags & 16) != 0;
+   CREATE INDEX CONCURRENTLY
+   zerver_usermessage_wildcard_mentioned_message_id
+   ON zerver_usermessage (user_profile_id, message_id)
+   WHERE (flags & 8) != 0 OR (flags & 16) != 0;
 
-        CREATE INDEX CONCURRENTLY
-        zerver_usermessage_unread_message_id
-        ON zerver_usermessage (user_profile_id, message_id)
-        WHERE (flags & 1) = 0;
+   CREATE INDEX CONCURRENTLY
+   zerver_usermessage_unread_message_id
+   ON zerver_usermessage (user_profile_id, message_id)
+   WHERE (flags & 1) = 0;
+   ```
 
 These will take some time to run, during which the server will
-continue to serve user traffic as usual with no disruption.  Once they
+continue to serve user traffic as usual with no disruption. Once they
 finish, you can proceed with installing Zulip 1.7.
 
 To help you estimate how long these will take on your server: count
 the number of UserMessage rows, with `select COUNT(*) from zerver_usermessage;`
-at the `./manage.py dbshell` prompt.  At the time these migrations
+at the `./manage.py dbshell` prompt. At the time these migrations
 were run on chat.zulip.org, it had 75M UserMessage rows; the first 5
 indexes took about 1 minute each to create, and the final,
 "unread_message" index took more like 10 minutes.

docs/production/export-and-import.md

@@ -5,28 +5,28 @@ move data from one Zulip server to another, do backups, compliance
 work, or migrate from your own servers to the hosted Zulip Cloud
 service (or back):
 
-* The [Backup](#backups) tool is designed for exact restoration of a
+- The [Backup](#backups) tool is designed for exact restoration of a
   Zulip server's state, for disaster recovery, testing with production
-  data, or hardware migration.  This tool has a few limitations:
+  data, or hardware migration. This tool has a few limitations:
 
-  * Backups must be restored on a server running the same Zulip
+  - Backups must be restored on a server running the same Zulip
     version (most precisely, one where `manage.py showmigrations` has
     the same output).
-  * Backups must be restored on a server running the same PostgreSQL
+  - Backups must be restored on a server running the same PostgreSQL
     version.
-  * Backups aren't useful for migrating organizations between
+  - Backups aren't useful for migrating organizations between
     self-hosting and Zulip Cloud (which may require renumbering all
     the users/messages/etc.).
 
   We highly recommend this tool in situations where it is applicable,
   because it is highly optimized and highly stable, since the hard
-  work is done by the built-in backup feature of PostgreSQL.  We also
+  work is done by the built-in backup feature of PostgreSQL. We also
   document [backup details](#backup-details) for users managing
   backups manually.
 
-* The logical [Data export](#data-export) tool is designed for
+- The logical [Data export](#data-export) tool is designed for
   migrating data between Zulip Cloud and other Zulip servers, as well
-  as various auditing purposes.  The logical export tool produces a
+  as various auditing purposes. The logical export tool produces a
   `.tar.gz` archive with most of the Zulip database data encoded in
   JSON files–a format shared by our [data
   import](#import-into-a-new-zulip-server) tools for third-party
@@ -34,20 +34,20 @@ service (or back):
   [Slack](https://zulip.com/help/import-from-slack).
 
   Like the backup tool, logical data exports must be imported on a
-  Zulip server running the same version.  However, logical data
+  Zulip server running the same version. However, logical data
   exports can be imported on Zulip servers running a different
   PostgreSQL version or hosting a different set of Zulip
-  organizations.  We recommend this tool in cases where the backup
+  organizations. We recommend this tool in cases where the backup
   tool isn't applicable, including situations where an easily
   machine-parsable export format is desired.
 
-* Zulip also has an [HTML archive
+- Zulip also has an [HTML archive
   tool](https://github.com/zulip/zulip-archive), which is primarily
   intended for public archives, but can also be useful to
   inexpensively preserve public stream conversations when
   decommissioning a Zulip organization.
 
-* It's possible to set up [PostgreSQL streaming
+- It's possible to set up [PostgreSQL streaming
   replication](#postgresql-streaming-replication) and the [S3 file
   upload
   backend](../production/upload-backends.html#s3-backend-configuration)
@@ -57,7 +57,7 @@ service (or back):
 
 The Zulip server has a built-in backup tool:
 
-```
+```bash
 # As the zulip user
 /home/zulip/deployments/current/manage.py backup
 # Or as root
@@ -65,10 +65,11 @@ su zulip -c '/home/zulip/deployments/current/manage.py backup'
 ```
 
 The backup tool provides the following options:
+
 - `--output=/tmp/backup.tar.gz`: Filename to write the backup tarball
-  to (default: write to a file in `/tmp`).  On success, the
+  to (default: write to a file in `/tmp`). On success, the
   console output will show the path to the output tarball.
-- `--skip-db`: Skip backup of the database.  Useful if you're using a
+- `--skip-db`: Skip backup of the database. Useful if you're using a
   remote PostgreSQL host with its own backup system and just need to
   back up non-database state.
 - `--skip-uploads`: If `LOCAL_UPLOADS_DIR` is set, user-uploaded files
@@ -82,9 +83,9 @@ server's state on another machine perfectly.
 
 First, [install a new Zulip server through Step 3][install-server]
 with the same version of both the base OS and Zulip from your previous
-installation.  Then, run as root:
+installation. Then, run as root:
 
-```
+```bash
 /home/zulip/deployments/current/scripts/setup/restore-backup /path/to/backup
 ```
 
@@ -109,11 +110,11 @@ errors when trying to access it via `zuliptest.example.com`.
 
 If you're not sure what versions were in use when a given backup was
 created, you can get that information via the files in the backup
-tarball: `postgres-version`, `os-version`, and `zulip-version`.  The
+tarball: `postgres-version`, `os-version`, and `zulip-version`. The
 following command may be useful for viewing these files without
 extracting the entire archive.
 
-```
+```bash
 tar -Oaxf /path/to/archive/zulip-backup-rest.tar.gz zulip-backup/zulip-version
 ```
 
@@ -128,27 +129,27 @@ server, including the database, settings, secrets from
 The following data is not included in these backup archives,
 and you may want to back up separately:
 
-* The server access/error logs from `/var/log/zulip`.  The Zulip
+- The server access/error logs from `/var/log/zulip`. The Zulip
   server only appends to logs, and they can be very large compared to
   the rest of the data for a Zulip server.
 
-* Files uploaded with the Zulip
-  [S3 file upload backend](../production/upload-backends.md).  We
+- Files uploaded with the Zulip
+  [S3 file upload backend](../production/upload-backends.md). We
   don't include these for two reasons. First, the uploaded file data
   in S3 can easily be many times larger than the rest of the backup,
   and downloading it all to a server doing a backup could easily
-  exceed its disk capacity.  Additionally, S3 is a reliable persistent
+  exceed its disk capacity. Additionally, S3 is a reliable persistent
   storage system with its own high-quality tools for doing backups.
 
-* SSL certificates.  These are not included because they are
+- SSL certificates. These are not included because they are
   particularly security-sensitive and are either trivially replaced
   (if generated via Certbot) or provided by the system administrator.
 
 For completeness, Zulip's backups do not include certain highly
-transient state that Zulip doesn't store in a database.  For example,
+transient state that Zulip doesn't store in a database. For example,
 typing status data, API rate-limiting counters, and RabbitMQ queues
 that are essentially always empty in a healthy server (like outgoing
-emails to send).  You can check whether these queues are empty using
+emails to send). You can check whether these queues are empty using
 `rabbitmqctl list_queues`.
 
 #### Backup details
@@ -156,41 +157,41 @@ emails to send).  You can check whether these queues are empty using
 This section is primarily for users managing backups themselves
 (E.g. if they're using a remote PostgreSQL database with an existing
 backup strategy), and also serves as documentation for what is
-included in the backups generated by Zulip's standard tools.  The
+included in the backups generated by Zulip's standard tools. The
 data includes:
 
-* The PostgreSQL database.  You can back this up with any standard
-database export or backup tool.  Zulip has built-in support for taking
-daily incremental backups using
-[wal-g](https://github.com/wal-g/wal-g); these backups are stored for
-30 days in S3.  If you have an Amazon S3 bucket you wish to store for
-storing the backups, edit `/etc/zulip/zulip-secrets.conf` on the
-PostgreSQL server to add:
+- The PostgreSQL database. You can back this up with any standard
+  database export or backup tool. Zulip has built-in support for taking
+  daily incremental backups using
+  [wal-g](https://github.com/wal-g/wal-g); these backups are stored for
+  30 days in S3. If you have an Amazon S3 bucket you wish to store for
+  storing the backups, edit `/etc/zulip/zulip-secrets.conf` on the
+  PostgreSQL server to add:
 
-    ```
-    s3_backups_key = # aws public key
-    s3_backups_secret_key =  # aws secret key
-    s3_backups_bucket = # name of S3 backup
-    ```
+  ```ini
+  s3_backups_key = # aws public key
+  s3_backups_secret_key =  # aws secret key
+  s3_backups_bucket = # name of S3 backup
+  ```
 
-    After adding the secrets, run
-    `/home/zulip/deployments/current/scripts/zulip-puppet-apply`.  You
-    can (and should) monitor that backups are running regularly via
-    the Nagios plugin installed into
-    `/usr/lib/nagios/plugins/zulip_postgresql_backups/check_postgresql_backup`.
+  After adding the secrets, run
+  `/home/zulip/deployments/current/scripts/zulip-puppet-apply`. You
+  can (and should) monitor that backups are running regularly via
+  the Nagios plugin installed into
+  `/usr/lib/nagios/plugins/zulip_postgresql_backups/check_postgresql_backup`.
 
-* Any user-uploaded files.  If you're using S3 as storage for file
-uploads, this is backed up in S3. But if you have instead set
-`LOCAL_UPLOADS_DIR`, any files uploaded by users (including avatars)
-will be stored in that directory and you'll want to back it up.
+- Any user-uploaded files. If you're using S3 as storage for file
+  uploads, this is backed up in S3. But if you have instead set
+  `LOCAL_UPLOADS_DIR`, any files uploaded by users (including avatars)
+  will be stored in that directory and you'll want to back it up.
 
-* Your Zulip configuration including secrets from `/etc/zulip/`.
-E.g. if you lose the value of `secret_key`, all users will need to
-log in again when you set up a replacement server since you won't be
-able to verify their cookies. If you lose `avatar_salt`, any
-user-uploaded avatars will need to be re-uploaded (since avatar
-filenames are computed using a hash of `avatar_salt` and user's
-email), etc.
+- Your Zulip configuration including secrets from `/etc/zulip/`.
+  E.g. if you lose the value of `secret_key`, all users will need to
+  log in again when you set up a replacement server since you won't be
+  able to verify their cookies. If you lose `avatar_salt`, any
+  user-uploaded avatars will need to be re-uploaded (since avatar
+  filenames are computed using a hash of `avatar_salt` and user's
+  email), etc.
 
 [export-import]: ../production/export-and-import.md
 
@@ -198,27 +199,27 @@ email), etc.
 
 To restore from a manual backup, the process is basically the reverse of the above:
 
-* Install new server as normal by downloading a Zulip release tarball
+- Install new server as normal by downloading a Zulip release tarball
   and then using `scripts/setup/install`. You don't need
   to run the `initialize-database` second stage which puts default
   data into the database.
 
-* Unpack to `/etc/zulip` the `settings.py` and `zulip-secrets.conf` files
+- Unpack to `/etc/zulip` the `settings.py` and `zulip-secrets.conf` files
   from your backups.
 
-* If you ran `initialize-database` anyway above, you'll want to run
+- If you ran `initialize-database` anyway above, you'll want to run
   `scripts/setup/postgresql-init-db` to drop the initial database first.
 
-* Restore your database from the backup.
+- Restore your database from the backup.
 
-* Reconfigure rabbitmq to use the password from `secrets.conf`
+- Reconfigure rabbitmq to use the password from `secrets.conf`
   by running, as root, `scripts/setup/configure-rabbitmq`.
 
-* If you're using local file uploads, restore those files to the path
+- If you're using local file uploads, restore those files to the path
   specified by `settings.LOCAL_UPLOADS_DIR` and (if appropriate) any
   logs.
 
-* Start the server using `scripts/restart-server`.
+- Start the server using `scripts/restart-server`.
 
 This restoration process can also be used to migrate a Zulip
 installation from one server to another.
@@ -233,11 +234,11 @@ that they are up to date using the Nagios plugin at:
 Zulip has database configuration for using PostgreSQL streaming
 replication. You can see the configuration in these files:
 
-* `puppet/zulip_ops/manifests/profile/postgresql.pp`
-* `puppet/zulip_ops/files/postgresql/*`
+- `puppet/zulip_ops/manifests/profile/postgresql.pp`
+- `puppet/zulip_ops/files/postgresql/*`
 
 We use this configuration for Zulip Cloud, and it works well in
-production, but it's not fully generic.  Contributions to make it a
+production, but it's not fully generic. Contributions to make it a
 supported and documented option for other installations are
 appreciated.
 
@@ -254,24 +255,24 @@ backups.
 ### Preventing changes during the export
 
 For best results, you'll want to shut down access to the organization
-before exporting; so that nobody can send new messages (etc.)  while
-you're exporting data.  There are two ways to do this:
+before exporting; so that nobody can send new messages (etc.) while
+you're exporting data. There are two ways to do this:
 
-1. `./scripts/stop-server`, which stops the whole server.  This is
-preferred if you're not hosting multiple organizations, because it has
-no side effects other than disabling the Zulip server for the
-duration.
+1. `./scripts/stop-server`, which stops the whole server. This is
+   preferred if you're not hosting multiple organizations, because it has
+   no side effects other than disabling the Zulip server for the
+   duration.
 1. Pass `--deactivate` to `./manage export`, which first deactivates
-the target organization, logging out all active login sessions and
-preventing all accounts from logging in or accessing the API.  This is
-preferred for environments like Zulip Cloud where you might want to
-export a single organization without disrupting any other users, and
-the intent is to move hosting of the organization (and forcing users
-to re-log in would be required as part of the hosting migration
-anyway).
+   the target organization, logging out all active login sessions and
+   preventing all accounts from logging in or accessing the API. This is
+   preferred for environments like Zulip Cloud where you might want to
+   export a single organization without disrupting any other users, and
+   the intent is to move hosting of the organization (and forcing users
+   to re-log in would be required as part of the hosting migration
+   anyway).
 
 We include both options in the instructions below, commented out so
-that neither runs (using the `# ` at the start of the lines).  If
+that neither runs (using the `# ` at the start of the lines). If
 you'd like to use one of these options, remove the `# ` at the start
 of the lines for the appropriate option.
 
@@ -280,7 +281,7 @@ of the lines for the appropriate option.
 Log in to a shell on your Zulip server as the `zulip` user. Run the
 following commands:
 
-```
+```bash
 cd /home/zulip/deployments/current
 # ./scripts/stop-server
 # export DEACTIVATE_FLAG="--deactivate"   # Deactivates the organization
@@ -291,80 +292,81 @@ cd /home/zulip/deployments/current
 the default organization hosted at the Zulip server's root domain.)
 
 This will generate a tarred archive with a name like
-`/tmp/zulip-export-zcmpxfm6.tar.gz`.  The archive contains several
+`/tmp/zulip-export-zcmpxfm6.tar.gz`. The archive contains several
 JSON files (containing the Zulip organization's data) as well as an
 archive of all the organization's uploaded files.
 
 ## Import into a new Zulip server
 
 1. [Install a new Zulip server](../production/install.md),
-**skipping Step 3** (you'll create your Zulip organization via the data
- import tool instead).
-    * Ensure that the Zulip server you're importing into is running the same
-      version of Zulip as the server you're exporting from.
+   **skipping Step 3** (you'll create your Zulip organization via the data
+   import tool instead).
 
-    * For exports from Zulip Cloud (zulip.com), you need to [upgrade to
-      master][upgrade-zulip-from-git], since we run run master on
-      Zulip Cloud:
+   - Ensure that the Zulip server you're importing into is running the same
+     version of Zulip as the server you're exporting from.
 
-      ```
-      /home/zulip/deployments/current/scripts/upgrade-zulip-from-git master
-      ```
+   - For exports from Zulip Cloud (zulip.com), you need to [upgrade to
+     `main`][upgrade-zulip-from-git], since we run run `main` on
+     Zulip Cloud:
 
-      It is not sufficient to be on the latest stable release, as
-      zulip.com runs pre-release versions of Zulip that are often
-      several months of development ahead of the latest release.
+     ```bash
+     /home/zulip/deployments/current/scripts/upgrade-zulip-from-git main
+     ```
 
-    * Note that if your server has limited free RAM, you'll want to
-      shut down the Zulip server with `./scripts/stop-server` while
-      you run the import, since our minimal system requirements do not
-      budget extra RAM for running the data import tool.
+     It is not sufficient to be on the latest stable release, as
+     zulip.com runs pre-release versions of Zulip that are often
+     several months of development ahead of the latest release.
+
+   - Note that if your server has limited free RAM, you'll want to
+     shut down the Zulip server with `./scripts/stop-server` while
+     you run the import, since our minimal system requirements do not
+     budget extra RAM for running the data import tool.
 
 2. If your new Zulip server is meant to fully replace a previous Zulip
-server, you may want to copy some settings from `/etc/zulip` to your
-new server to reuse the server-level configuration and secret keys
-from your old server.  There are a few important details to understand
-about doing so:
+   server, you may want to copy some settings from `/etc/zulip` to your
+   new server to reuse the server-level configuration and secret keys
+   from your old server. There are a few important details to understand
+   about doing so:
 
-   * Copying `/etc/zulip/settings.py` and `/etc/zulip/zulip.conf` is
-     safe and recommended.  Care is required when copying secrets from
+   - Copying `/etc/zulip/settings.py` and `/etc/zulip/zulip.conf` is
+     safe and recommended. Care is required when copying secrets from
      `/etc/zulip/zulip-secrets.conf` (details below).
-   * If you copy `zulip_org_id` and `zulip_org_key` (the credentials
+   - If you copy `zulip_org_id` and `zulip_org_key` (the credentials
      for the [mobile push notifications
      service](../production/mobile-push-notifications.md)), you should
      be very careful to make sure the no users had their IDs
      renumbered during the import process (this can be checked using
-     `manage.py shell` with some care).  The push notifications
+     `manage.py shell` with some care). The push notifications
      service has a mapping of which `user_id` values are associated
      with which devices for a given Zulip server (represented by the
-     `zulip_org_id` registration).  This means that if any `user_id`
+     `zulip_org_id` registration). This means that if any `user_id`
      values were renumbered during the import and you don't register a
      new `zulip_org_id`, push notifications meant for the user who now
      has ID 15 may be sent to devices registered by the user who had
-     user ID 15 before the data export (yikes!).  The solution is
+     user ID 15 before the data export (yikes!). The solution is
      simply to not copy these settings and re-register your server for
      mobile push notifications if any users had their IDs renumbered
      during the logical export/import process.
-   * If you copy the `rabbitmq_password` secret from
+   - If you copy the `rabbitmq_password` secret from
      `zulip-secrets.conf`, you'll need to run
      `scripts/setup/configure-rabbitmq` to update your local RabbitMQ
      installation to use the password in your Zulip secrets file.
-   * You will likely want to copy `camo_key` (required to avoid
+   - You will likely want to copy `camo_key` (required to avoid
      breaking certain links) and any settings you added related to
      authentication and email delivery so that those work on your new
      server.
-   * Copying `avatar_salt` is not recommended, due to similar issues
-     to the mobile push notifications service.  Zulip will
+   - Copying `avatar_salt` is not recommended, due to similar issues
+     to the mobile push notifications service. Zulip will
      automatically rewrite avatars at URLs appropriate for the new
      user IDs, and using the same avatar salt (and same server URL)
      post import could result in issues with browsers caching the
      avatar image improperly for users whose ID was renumbered.
 
 3. Log in to a shell on your Zulip server as the `zulip` user. Run the
-following commands, replacing the filename with the path to your data
-export tarball:
+   following commands, replacing the filename with the path to your data
+   export tarball:
 
-```
+```bash
 cd ~
 tar -xf /path/to/export/file/zulip-export-zcmpxfm6.tar.gz
 cd /home/zulip/deployments/current
@@ -386,7 +388,7 @@ custom subdomain, e.g. if you already have an existing organization on the
 root domain. Replace the last three lines above with the following, after replacing
 `<subdomain>` with the desired subdomain.
 
-```
+```bash
 ./manage.py import <subdomain> ~/zulip-export-zcmpxfm6
 ./manage.py reactivate_realm -r <subdomain>  # Reactivates the organization
 ```
@@ -400,15 +402,16 @@ Your users will need to either authenticate using something like
 Google auth or start by resetting their passwords.
 
 You can use the `./manage.py send_password_reset_email` command to
-send password reset emails to your users.  We
+send password reset emails to your users. We
 recommend starting with sending one to yourself for testing:
 
-```
+```bash
 ./manage.py send_password_reset_email -u username@example.com
 ```
 
 and then once you're ready, you can email them to everyone using e.g.
-```
+
+```bash
 ./manage.py send_password_reset_email -r '' --all-users
 ```
 
@@ -418,15 +421,15 @@ and then once you're ready, you can email them to everyone using e.g.
 
 If you did a test import of a Zulip organization, you may want to
 delete the test import data from your Zulip server before doing a
-final import.  You can **permanently delete** all data from a Zulip
+final import. You can **permanently delete** all data from a Zulip
 organization using the following procedure:
 
-* Start a [Zulip management shell](../production/management-commands.html#manage-py-shell)
-* In the management shell, run the following commands, replacing `""`
+- Start a [Zulip management shell](../production/management-commands.html#manage-py-shell)
+- In the management shell, run the following commands, replacing `""`
   with the subdomain if [you are hosting the organization on a
   subdomain](../production/multiple-organizations.md):
 
-```
+```python
 realm = Realm.objects.get(string_id="")
 realm.delete()
 ```
@@ -434,7 +437,8 @@ realm.delete()
 The output contains details on the objects deleted from the database.
 
 Now, exit the management shell and run this to clear Zulip's cache:
-```
+
+```bash
 /home/zulip/deployments/current/scripts/setup/flush-memcached
 ```
 
@@ -444,7 +448,7 @@ can additionally delete all file uploads, avatars, and custom emoji on
 a Zulip server (across **all organizations**) with the following
 command:
 
-```
+```bash
 rm -rf /home/zulip/uploads/*/*
 ```
 
@@ -454,7 +458,7 @@ in the management shell before deleting the organization from the
 database (this will be `2` for the first organization created on a
 Zulip server, shown in the example below), e.g.:
 
-```
+```bash
 rm -rf /home/zulip/uploads/*/2/
 ```
 

docs/production/giphy-gif-integration.md

@@ -17,7 +17,7 @@ To enable this integration, you need to get a production API key from
 1. Choose **SDK** as product type and click **Next Step**.
 
 1. Enter a name and a description for your app and click on **Create
-   New App**.  The hostname for your Zulip server is a fine name.
+   New App**. The hostname for your Zulip server is a fine name.
 
 1. You will receive a beta API key. Apply for a production API key
    by following the steps mentioned by GIPHY on the same page.
@@ -36,12 +36,10 @@ follows:
 1. Restart the Zulip server with
    `/home/zulip/deployments/current/scripts/restart-server`.
 
-Congratulations!  You've configured the GIPHY integration for your
-Zulip server.  Your users can now use the integration as described in
-[the help center article][help-center-giphy].  (A browser reload may
+Congratulations! You've configured the GIPHY integration for your
+Zulip server. Your users can now use the integration as described in
+[the help center article][help-center-giphy]. (A browser reload may
 be required).
 
-
-
 [help-center-giphy]: https://zulip.com/help/animated-gifs-from-giphy
 [giphy-dashboard]: https://developers.giphy.com/dashboard/

docs/production/install-existing-server.md

@@ -1,4 +1,4 @@
-```eval_rst
+```{eval-rst}
 :orphan:
 ```
 
@@ -11,38 +11,45 @@ configuration files in /etc, so we recommend against installing it on
 a server running other nginx or django apps.
 
 But if you do, here are some things you can do that may make it
-possible to retain your existing site. However, this is *NOT*
+possible to retain your existing site. However, this is _NOT_
 recommended, and you may break your server. Make sure you have backups
 and a provisioning script ready to go to wipe and restore your
 existing services if (when) your server goes down.
 
-These instructions are only for experts.  If you're not an experienced
+These instructions are only for experts. If you're not an experienced
 Linux sysadmin, you will have a much better experience if you get a
 dedicated VM to install Zulip on instead (or [use
-zulip.com](https://zulip.com).
+zulip.com](https://zulip.com)).
 
 ### Nginx
 
 Copy your existing nginx configuration to a backup and then merge the
 one created by Zulip into it:
 
-```shell
+```bash
 sudo cp /etc/nginx/nginx.conf /etc/nginx.conf.before-zulip-install
 sudo wget -O /etc/nginx/nginx.conf.zulip \
-    https://raw.githubusercontent.com/zulip/zulip/master/puppet/zulip/files/nginx/nginx.conf
+    https://raw.githubusercontent.com/zulip/zulip/main/puppet/zulip/templates/nginx.conf.template.erb
 sudo meld /etc/nginx/nginx.conf /etc/nginx/nginx.conf.zulip  # be sure to merge to the right
 ```
 
+Since the file in Zulip is an [ERB Puppet
+template](https://puppet.com/docs/puppet/7/lang_template_erb.html),
+you will also need to replace any `<%= ... %>` sections with
+appropriate content. For instance `<%= @ca_crt %>` should be replaced
+with `/etc/ssl/certs/ca-certificates.crt` on Debian and Ubuntu
+installs.
+
 After the Zulip installation completes, then you can overwrite (or
 merge) your new nginx.conf with the installed one:
 
-```shell
+```console
 $ sudo meld /etc/nginx/nginx.conf.zulip /etc/nginx/nginx.conf  # be sure to merge to the right
 $ sudo service nginx restart
 ```
 
 Zulip's Puppet configuration will change the ownership of
-`/var/log/nginx` so that the `zulip` user can access it.  Depending on
+`/var/log/nginx` so that the `zulip` user can access it. Depending on
 your configuration, this may or may not cause problems.
 
 ### Puppet
@@ -51,13 +58,13 @@ If you have a Puppet server running on your server, you will get an
 error message about not being able to connect to the client during the
 install process:
 
-```shell
+```console
 puppet-agent[29873]: Could not request certificate: Failed to open TCP connection to puppet:8140
 ```
 
 So you'll need to shut down any Puppet servers.
 
-```shell
+```console
 $ sudo service puppet-agent stop
 $ sudo service puppet stop
 ```
@@ -66,9 +73,9 @@ $ sudo service puppet stop
 
 Zulip expects to install PostgreSQL 12, and find that listening on
 port 5432; any other version of PostgreSQL that is detected at install
-time will cause the install to abort.  If you already have PostgreSQL
+time will cause the install to abort. If you already have PostgreSQL
 installed, you can pass `--postgresql-version=` to the installer to
-have it use that version.  It will replace the package with the latest
+have it use that version. It will replace the package with the latest
 from the PostgreSQL apt repository, but existing data will be
 retained.
 
@@ -78,7 +85,7 @@ that.
 
 ### Memcached, Redis, and RabbitMQ
 
-Zulip will, by default, configure these services for its use.  The
+Zulip will, by default, configure these services for its use. The
 configuration we use is pretty basic, but if you're using them for
 something else, you'll want to make sure the configurations are
 compatible.
@@ -90,6 +97,6 @@ We don't provide a convenient way to uninstall a Zulip server.
 ## No support, but contributions welcome!
 
 Most of the limitations are things we'd accept a pull request to fix;
-we welcome contributions to shrink this list of gotchas.  Chat with us
+we welcome contributions to shrink this list of gotchas. Chat with us
 in the [chat.zulip.org community](../contributing/chat-zulip-org.md) if you're
 interested in helping!

docs/production/install.md

@@ -14,28 +14,28 @@ you can create a test organization at <https://zulip.com/new>.
 
 ## Step 1: Download the latest release
 
-Download and unpack [the latest built server
-tarball](https://www.zulip.org/dist/releases/zulip-server-latest.tar.gz)
-with the following commands:
+Download and unpack [the latest server
+release](https://download.zulip.com/server/zulip-server-latest.tar.gz)
+(**Zulip Server {{ LATEST_RELEASE_VERSION }}**) with the following commands:
 
-```
+```bash
 cd $(mktemp -d)
-wget https://www.zulip.org/dist/releases/zulip-server-latest.tar.gz
+wget https://download.zulip.com/server/zulip-server-latest.tar.gz
 tar -xf zulip-server-latest.tar.gz
 ```
 
-* If you'd like to verify the download, we
-[publish the sha256sums of our release tarballs](https://www.zulip.org/dist/releases/SHA256SUMS.txt).
-* You can also
-[install a pre-release version of Zulip](../production/deployment.html#installing-zulip-from-git)
-using code from our [repository on GitHub](https://github.com/zulip/zulip/).
+- If you'd like to verify the download, we
+  [publish the sha256sums of our release tarballs](https://download.zulip.com/server/SHA256SUMS.txt).
+- You can also
+  [install a pre-release version of Zulip](../production/deployment.html#installing-zulip-from-git)
+  using code from our [repository on GitHub](https://github.com/zulip/zulip/).
 
 ## Step 2: Install Zulip
 
 To set up Zulip with the most common configuration, you can run the
 installer as follows:
 
-```
+```bash
 sudo -s  # If not already root
 ./zulip-server-*/scripts/setup/install --certbot \
     --email=YOUR_EMAIL --hostname=YOUR_HOSTNAME
@@ -48,24 +48,26 @@ If the script gives an error, consult [Troubleshooting](#troubleshooting) below.
 
 #### Installer options
 
-* `--email=you@example.com`: The email address of the person or team
+- `--email=you@example.com`: The email address of the person or team
   who should get support and error emails from this Zulip server.
   This becomes `ZULIP_ADMINISTRATOR` ([docs][doc-settings]) in the
   Zulip settings.
 
-* `--hostname=zulip.example.com`: The user-accessible domain name for
+- `--hostname=zulip.example.com`: The user-accessible domain name for
   this Zulip server, i.e., what users will type in their web browser.
   This becomes `EXTERNAL_HOST` ([docs][doc-settings]) in the Zulip
   settings.
 
-* `--self-signed-cert`: With this option, the Zulip installer
-  generates a self-signed SSL certificate for the server.  This isn't
+- `--self-signed-cert`: With this option, the Zulip installer
+  generates a self-signed SSL certificate for the server. This isn't
   suitable for production use, but may be convenient for testing.
 
-* `--certbot`: With this option, the Zulip installer automatically
-  obtains an SSL certificate for the server [using Certbot][doc-certbot].
-  If you'd prefer to acquire an SSL certificate yourself in any other
-  way, it's easy to [provide it to Zulip][doc-ssl-manual].
+- `--certbot`: With this option, the Zulip installer automatically
+  obtains an SSL certificate for the server [using
+  Certbot][doc-certbot], and configures a cron job to renew the
+  certificate automatically. If you'd prefer to acquire an SSL
+  certificate yourself in any other way, it's easy to [provide it to
+  Zulip][doc-ssl-manual].
 
 You can see the more advanced installer options in our [deployment options][doc-deployment-options]
 documentation.
@@ -77,7 +79,7 @@ documentation.
 
 ## Step 3: Create a Zulip organization, and log in
 
-On success, the install script prints a link.  If you're [restoring a
+On success, the install script prints a link. If you're [restoring a
 backup][zulip-backups] or importing your data from [Slack][slack-import],
 or another Zulip server, you should stop here
 and return to the import instructions.
@@ -85,59 +87,61 @@ and return to the import instructions.
 [slack-import]: https://zulip.com/help/import-from-slack
 [zulip-backups]: ../production/export-and-import.html#backups
 
-Otherwise, open the link in a browser.  Follow the prompts to set up
+Otherwise, open the link in a browser. Follow the prompts to set up
 your organization, and your own user account as an administrator.
 Then, log in!
 
-The link is a secure one-time-use link.  If you need another
-later, you can generate a new one by running `manage.py
-generate_realm_creation_link` on the server.  See also our doc on
-running [multiple organizations on the same server](multiple-organizations.md)
-if that's what you're planning to do.
+The link is a secure one-time-use link. If you need another
+later, you can generate a new one by running
+`manage.py generate_realm_creation_link` on the server. See also our
+doc on running [multiple organizations on the same
+server](multiple-organizations.md) if that's what you're planning to
+do.
 
 ## Step 4: Configure and use
 
 To really see Zulip in action, you'll need to get the people you work
 together with using it with you.
-* [Set up outgoing email](email.md) so Zulip can confirm new users'
+
+- [Set up outgoing email](email.md) so Zulip can confirm new users'
   email addresses and send notifications.
-* Learn how to [get your organization started][realm-admin-docs] using
+- Learn how to [get your organization started][realm-admin-docs] using
   Zulip at its best.
 
 Learning more:
 
-* Subscribe to the [Zulip announcements email
-list](https://groups.google.com/forum/#!forum/zulip-announce) for
-server administrators.  This extremely low-traffic list is for
-important announcements, including [new
-releases](../overview/release-lifecycle.md) and security issues. You
-can also use the [RSS
-feed](https://groups.google.com/forum/#!aboutgroup/zulip-announce).
-* Follow [Zulip on Twitter](https://twitter.com/zulip).
-* Learn how to [configure your Zulip server settings](settings.md).
-* Learn about [Backups, export and import](../production/export-and-import.md)
-and [upgrading](../production/upgrade-or-modify.md) a production Zulip
-server.
+- Subscribe to the [Zulip announcements email
+  list](https://groups.google.com/forum/#!forum/zulip-announce) for
+  server administrators. This extremely low-traffic list is for
+  important announcements, including [new
+  releases](../overview/release-lifecycle.md) and security issues. You
+  can also use the [RSS
+  feed](https://groups.google.com/forum/#!aboutgroup/zulip-announce).
+- Follow [Zulip on Twitter](https://twitter.com/zulip).
+- Learn how to [configure your Zulip server settings](settings.md).
+- Learn about [Backups, export and import](../production/export-and-import.md)
+  and [upgrading](../production/upgrade-or-modify.md) a production Zulip
+  server.
 
 [realm-admin-docs]: https://zulip.com/help/getting-your-organization-started-with-zulip
 
-```eval_rst
-.. _installer-details:
-```
+(installer-details)=
+
 ## Details: What the installer does
 
 The install script does several things:
-* Creates the `zulip` user, which the various Zulip servers will run as.
-* Creates `/home/zulip/deployments/`, which the Zulip code for this
-deployment (and future deployments when you upgrade) goes into.  At the
-very end of the install process, the script moves the Zulip code tree
-it's running from (which you unpacked from a tarball above) to a
-directory there, and makes `/home/zulip/deployments/current` as a
-symbolic link to it.
-* Installs Zulip's various dependencies.
-* Configures the various third-party services Zulip uses, including
-PostgreSQL, RabbitMQ, Memcached and Redis.
-* Initializes Zulip's database.
+
+- Creates the `zulip` user, which the various Zulip servers will run as.
+- Creates `/home/zulip/deployments/`, which the Zulip code for this
+  deployment (and future deployments when you upgrade) goes into. At the
+  very end of the install process, the script moves the Zulip code tree
+  it's running from (which you unpacked from a tarball above) to a
+  directory there, and makes `/home/zulip/deployments/current` as a
+  symbolic link to it.
+- Installs Zulip's various dependencies.
+- Configures the various third-party services Zulip uses, including
+  PostgreSQL, RabbitMQ, Memcached and Redis.
+- Initializes Zulip's database.
 
 If you'd like to deploy Zulip with these services on different
 machines, check out our [deployment options documentation](deployment.md).
@@ -145,20 +149,20 @@ machines, check out our [deployment options documentation](deployment.md).
 ## Troubleshooting
 
 **Install script.**
-The Zulip install script is designed to be idempotent.  This means
+The Zulip install script is designed to be idempotent. This means
 that if it fails, then once you've corrected the cause of the failure,
 you can just rerun the script.
 
 The install script automatically logs a transcript to
-`/var/log/zulip/install.log`.  In case of failure, you might find the
-log handy for resolving the issue.  Please include a copy of this log
+`/var/log/zulip/install.log`. In case of failure, you might find the
+log handy for resolving the issue. Please include a copy of this log
 file in any bug reports.
 
 **The `zulip` user's password.**
 By default, the `zulip` user doesn't
 have a password, and is intended to be accessed by `su zulip` from the
 `root` user (or via SSH keys or a password, if you want to set those
-up, but that's up to you as the system administrator).  Most people
+up, but that's up to you as the system administrator). Most people
 who are prompted for a password when running `su zulip` turn out to
 already have switched to the `zulip` user earlier in their session,
 and can just skip that step.
@@ -172,7 +176,7 @@ how to debug.
 **Community.** If the tips above don't help, please visit [#production
 help][production-help] in the [Zulip development community
 server][chat-zulip-org] for realtime help, and we'll try to help you
-out!  Please provide details like the full traceback from the bottom
+out! Please provide details like the full traceback from the bottom
 of `/var/log/zulip/errors.log` in your report (ideally in a [code
 block][code-block]).
 

docs/production/maintain-secure-upgrade.md

@@ -1,4 +1,4 @@
-```eval_rst
+```{eval-rst}
 :orphan:
 ```
 
@@ -8,6 +8,7 @@ This was once a long page covering a bunch of topics; those topics
 have since all moved to dedicated pages:
 
 ### Monitoring
+
 Moved to [Troubleshooting](../production/troubleshooting.html#monitoring).
 
 ### Securing your Zulip server

docs/production/management-commands.md

@@ -1,16 +1,16 @@
 # Management commands
 
 Sometimes, you need to modify or inspect Zulip data from the command
-line.  To help with this, Zulip ships with over 100 command-line tools
+line. To help with this, Zulip ships with over 100 command-line tools
 implemented using the [Django management commands
 framework][django-management].
 
 ## Running management commands
 
-Start by logging in as the `zulip` user on the Zulip server.  Then run
+Start by logging in as the `zulip` user on the Zulip server. Then run
 them as follows:
 
-```
+```bash
 cd /home/zulip/deployments/current
 
 # Start by reading the help
@@ -25,7 +25,7 @@ primarily want to use those in the `[zerver]` section as those are the
 ones specifically built for Zulip.
 
 As a warning, some of them are designed for specific use cases and may
-cause problems if run in other situations.  If you're not sure, it's
+cause problems if run in other situations. If you're not sure, it's
 worth reading the documentation (or the code, usually available at
 `zerver/management/commands/`; they're generally very simple programs).
 
@@ -39,7 +39,7 @@ string ID (usually the subdomain).
 You can see all the organizations on your Zulip server using
 `./manage.py list_realms`.
 
-```
+```console
 zulip@zulip:~$ /home/zulip/deployments/current/manage.py list_realms
 id    string_id                                name
 --    ---------                                ----
@@ -54,14 +54,14 @@ unlikely to ever need to interact with that realm.)
 Unless you are
 [hosting multiple organizations on your Zulip server](../production/multiple-organizations.md),
 your single Zulip organization on the root domain will have the empty
-string (`''`) as its `string_id`.  So you can run e.g.:
+string (`''`) as its `string_id`. So you can run e.g.:
 
-```
+```console
 zulip@zulip:~$ /home/zulip/deployments/current/manage.py show_admins -r ''
 ```
 
 Otherwise, the `string_id` will correspond to the organization's
-subdomain.  E.g. on `it.zulip.example.com`, use
+subdomain. E.g. on `it.zulip.example.com`, use
 `/home/zulip/deployments/current/manage.py show_admins -r it`.
 
 ## manage.py shell
@@ -73,7 +73,7 @@ You can get an IPython shell with full access to code within the Zulip
 project using `manage.py shell`, e.g., you can do the following to
 change a user's email address:
 
-```
+```console
 $ cd /home/zulip/deployments/current/
 $ ./manage.py shell
 In [1]: user_profile = get_user_profile_by_email("email@example.com")
@@ -86,11 +86,11 @@ formatting data from Zulip's tables for inspection; Zulip's own
 you understand how the codebase is organized.
 
 We recommend against directly editing objects and saving them using
-Django's `object.save()`.  While this will save your changes to the
+Django's `object.save()`. While this will save your changes to the
 database, for most objects, in addition to saving the changes to the
 database, one may also need to flush caches, notify the apps and open
 browser windows, and record the change in Zulip's `RealmAuditLog`
-audit history table.  For almost any data change you want to do, there
+audit history table. For almost any data change you want to do, there
 is already a function in `zerver.lib.actions.py` with a name like
 `do_change_full_name` that updates that field and notifies clients
 correctly.
@@ -102,36 +102,39 @@ access other functions, you'll need to import them yourself.
 ## Other useful manage.py commands
 
 There are dozens of useful management commands under
-`zerver/management/commands/`.  We detail a few here:
+`zerver/management/commands/`. We detail a few here:
 
-* `./manage.py help`: Lists all available management commands.
-* `./manage.py dbshell`: If you're more comfortable with raw SQL than
+- `./manage.py help`: Lists all available management commands.
+- `./manage.py dbshell`: If you're more comfortable with raw SQL than
   Python, this will open a PostgreSQL SQL shell connected to the Zulip
-  server's database.  Beware of changing data; editing data directly
+  server's database. Beware of changing data; editing data directly
   with SQL will often not behave correctly because PostgreSQL doesn't
   know to flush Zulip's caches or notify browsers of changes.
-* `./manage.py send_custom_email`: Can be used to send an email to a set
-  of users.  The `--help` documents how to run it from a `manage.py
-  shell` for use with more complex programmatically computed sets of
-  users.
-* `./manage.py send_password_reset_email`: Sends password reset email(s)
+- `./manage.py send_custom_email`: Can be used to send an email to a set
+  of users. The `--help` documents how to run it from a
+  `manage.py shell` for use with more complex programmatically
+  computed sets of users.
+- `./manage.py send_password_reset_email`: Sends password reset email(s)
   to one or more users.
-* `./manage.py change_realm_subdomain`: Change subdomain of a realm.
-* `./manage.py change_user_email`: Change a user's email address.
-* `./manage.py change_user_role`: Can change are user's role
+- `./manage.py change_realm_subdomain`: Change subdomain of a realm.
+- `./manage.py change_user_email`: Change a user's email address.
+- `./manage.py change_user_role`: Can change are user's role
   (easier done [via the
   UI](https://zulip.com/help/change-a-users-role)) or give bots the
   `can_forge_sender` permission, which is needed for certain special API features.
-* `./manage.py export_single_user`: does a limited version of the [main
+- `./manage.py export_single_user`: does a limited version of the [main
   export tools](../production/export-and-import.md) containing just
   the messages accessible by a single user.
-* `./manage.py reactivate_realm`: Reactivates a realm.
-* `./manage.py deactivate_user`: Deactivates a user. This can be done
+- `./manage.py reactivate_realm`: Reactivates a realm.
+- `./manage.py deactivate_user`: Deactivates a user. This can be done
   more easily in Zulip's organization administrator UI.
-* `./manage.py delete_user`: Completely delete a user from the database.
+- `./manage.py delete_user`: Completely delete a user from the database.
   For most purposes, deactivating users is preferred, since that does not
   alter message history for other users.
   See the `./manage.py delete_user --help` documentation for details.
+- `./manage.py clear_auth_rate_limit_history`: If a user failed authenticaton
+  attempts too many times and further attempts are disallowed by the rate limiter,
+  this can be used to reset the limit.
 
 All of our management commands have internal documentation available
 via `manage.py command_name --help`.
@@ -141,17 +144,17 @@ via `manage.py command_name --help`.
 Zulip supports several mechanisms for running custom code on a
 self-hosted Zulip server:
 
-* Using an existing [integration][integrations] or writing your own
+- Using an existing [integration][integrations] or writing your own
   [webhook integration][webhook-integrations] or [bot][writing-bots].
-* Writing a program using the [Zulip API][zulip-api].
-* [Modifying the Zulip server][modifying-zulip].
-* Using the interactive [management shell](#manage-py-shell),
+- Writing a program using the [Zulip API][zulip-api].
+- [Modifying the Zulip server][modifying-zulip].
+- Using the interactive [management shell](#manage-py-shell),
   documented above, for one-time work or prototyping.
-* Writing a custom management command, detailed here.
+- Writing a custom management command, detailed here.
 
 Custom management commands are Python 3 programs that run inside
 Zulip's context, so that they can access its libraries, database, and
-code freely.  They can be the best choice when you want to run custom
+code freely. They can be the best choice when you want to run custom
 code that is not permitted by Zulip's security model (and thus can't
 be done more easily using the [REST API][zulip-api]) and that you
 might want to run often (and so the interactive `manage.py shell` is

docs/production/mobile-push-notifications.md

@@ -2,47 +2,48 @@
 
 Zulip's iOS and Android mobile apps support receiving push
 notifications from Zulip servers to let users know when new messages
-have arrived.  This is an important feature to having a great
+have arrived. This is an important feature to having a great
 experience using the Zulip mobile apps.
 
 For technical reasons (explained below), in order to deliver mobile
 push notifications in the app store versions of our mobile apps, you
 will need to register your Zulip server with the Zulip mobile push
-notification service.  This service will forward push notifications
+notification service. This service will forward push notifications
 generated by your server to the Zulip mobile app automatically.
 
-
-
 ## How to sign up
 
 Starting with Zulip 1.6 for both Android and iOS, Zulip servers
 support forwarding push notifications to a central push notification
-forwarding service.  Accessing this service requires outgoing HTTPS
+forwarding service. Accessing this service requires outgoing HTTPS
 access to the public Internet; if that is restricted by a proxy, you
 will need to [configure Zulip to use your outgoing HTTP
-proxy](../production/deployment.html#using-an-outgoing-http-proxy)
+proxy](../production/deployment.html#customizing-the-outgoing-http-proxy)
 first.
 
 You can enable this for your Zulip server as follows:
 
-1. Uncomment the `PUSH_NOTIFICATION_BOUNCER_URL =
-   'https://push.zulipchat.com'` line in your `/etc/zulip/settings.py`
-   file (i.e. remove the `#` at the start of the line), and
-   [restart your Zulip server](../production/settings.html#making-changes).
-   If you installed your Zulip server with a version older than 1.6,
-   you'll need to add the line (it won't be there to uncomment).
+1. Uncomment the
+   `PUSH_NOTIFICATION_BOUNCER_URL = 'https://push.zulipchat.com'` line
+   in your `/etc/zulip/settings.py` file (i.e. remove the `#` at the
+   start of the line), and [restart your Zulip
+   server](../production/settings.html#making-changes). If you
+   installed your Zulip server with a version older than 1.6, you'll
+   need to add the line (it won't be there to uncomment).
 
 1. If you're running Zulip 1.8.1 or newer, you can run the
-    registration command:
-    ```
-    # As root:
-    su zulip -c '/home/zulip/deployments/current/manage.py register_server'
-    # Or as the zulip user, you can skip the `su zulip -c`:
-    /home/zulip/deployments/current/manage.py register_server
+   registration command:
+
+   ```bash
+   # As root:
+   su zulip -c '/home/zulip/deployments/current/manage.py register_server'
+   # Or as the zulip user, you can skip the `su zulip -c`:
+   /home/zulip/deployments/current/manage.py register_server
+
+   # docker-zulip users can run this inside the container with `docker exec`:
+   docker exec -it -u zulip <container_name> /home/zulip/deployments/current/manage.py register_server
+   ```
 
-    # docker-zulip users can run this inside the container with `docker exec`:
-    docker exec -it -u zulip <container_name> /home/zulip/deployments/current/manage.py register_server
-    ```
    This command will print the registration data it would send to the
    mobile push notifications service, ask you to accept the terms of
    service, and if you accept, register your server. If you have trouble,
@@ -52,24 +53,24 @@ You can enable this for your Zulip server as follows:
    you'll each need to log out and log back in again in order to start
    getting push notifications.
 
-Congratulations!  You've successfully set up the service.
+Congratulations! You've successfully set up the service.
 
 If you'd like to verify that everything is working, you can do the
-following.  Please follow the instructions carefully:
+following. Please follow the instructions carefully:
 
-* [Configure mobile push notifications to always be sent][mobile-notifications-always]
+- [Configure mobile push notifications to always be sent][mobile-notifications-always]
   (normally they're only sent if you're idle, which isn't ideal for
   this sort of testing).
-* On an Android device, download and log in to the
-[Zulip Android app](https://play.google.com/store/apps/details?id=com.zulipmobile).
-If you were already logged in before configuring the server, you'll
-need to log out first, since the app only registers for push
-notifications on login.
-* Hit the home button, so Zulip is running in the background, and then
-have **another user** send you a **private message** (By default,
-Zulip only sends push notifications for private messages sent by other
-users and messages mentioning you).  A push notification should appear
-in the Android notification area.
+- On an Android device, download and log in to the
+  [Zulip Android app](https://play.google.com/store/apps/details?id=com.zulipmobile).
+  If you were already logged in before configuring the server, you'll
+  need to log out first, since the app only registers for push
+  notifications on login.
+- Hit the home button, so Zulip is running in the background, and then
+  have **another user** send you a **private message** (By default,
+  Zulip only sends push notifications for private messages sent by other
+  users and messages mentioning you). A push notification should appear
+  in the Android notification area.
 
 [mobile-notifications-always]: https://zulip.com/help/test-mobile-notifications
 
@@ -78,23 +79,23 @@ in the Android notification area.
 Your server's registration includes the server's hostname and contact
 email address (from `EXTERNAL_HOST` and `ZULIP_ADMINISTRATOR` in
 `/etc/zulip/settings.py`, aka the `--hostname` and `--email` options
-in the installer).  You can update your server's registration data by
+in the installer). You can update your server's registration data by
 running `manage.py register_server` again.
 
 If you'd like to rotate your server's API key for this service
-(`zulip_org_key`), you need to use `manage.py register_server
---rotate-key` option; it will automatically generate a new
-`zulip_org_key` and store that new key in
+(`zulip_org_key`), you need to use
+`manage.py register_server --rotate-key` option; it will automatically
+generate a new `zulip_org_key` and store that new key in
 `/etc/zulip/zulip-secrets.conf`.
 
 ## Why this is necessary
 
 Both Google's and Apple's push notification services have a security
 model that does not support mutually untrusted self-hosted servers
-sending push notifications to the same app.  In particular, when an
+sending push notifications to the same app. In particular, when an
 app is published to their respective app stores, one must compile into
 the app a secret corresponding to the server that will be able to
-publish push notifications for the app.  This means that it is
+publish push notifications for the app. This means that it is
 impossible for a single app in their stores to receive push
 notifications from multiple, mutually untrusted, servers.
 
@@ -105,39 +106,42 @@ forwarding service).
 
 ## Security and privacy
 
-Use of the push notification bouncer is subject to the
-[Zulipchat Terms of Service](https://zulip.com/terms/). By using
-push notifications, you agree to those terms.
+Use of the push notification bouncer is subject to the Zulip Cloud [Terms of
+Service](https://zulip.com/policies/terms), [Privacy
+Policy](https://zulip.com/policies/privacy) and [Rules of
+Use](https://zulip.com/policies/rules). By using push notifications, you agree
+to these terms.
 
 We've designed this push notification bouncer service with security
 and privacy in mind:
 
-* A central design goal of the the Push Notification Service is to
+- A central design goal of the the Push Notification Service is to
   avoid any message content being stored or logged by the service,
   even in error cases.
-* The Push Notification Service only stores the necessary metadata for
+- The Push Notification Service only stores the necessary metadata for
   delivering the notifications to the appropriate devices, and nothing
   else:
-    * The APNS/FCM tokens needed to securely send mobile push
-      notifications to iOS and Android devices, one per device
-      registered to be notified by your Zulip server.
-    * User ID numbers generated by your Zulip server, needed to route
-      a given notification to the appropriate set of mobile devices.
-      These user ID numbers are are opaque to the Push Notification
-      Service and Kandra Labs.
-* The Push Notification Service receives (but does not store) the
+  - The APNS/FCM tokens needed to securely send mobile push
+    notifications to iOS and Android devices, one per device
+    registered to be notified by your Zulip server.
+  - User ID numbers generated by your Zulip server, needed to route
+    a given notification to the appropriate set of mobile devices.
+    These user ID numbers are are opaque to the Push Notification
+    Service and Kandra Labs.
+- The Push Notification Service receives (but does not store) the
   contents of individual mobile push notifications:
-    * The numeric message ID generated by your Zulip server.
-    * Metadata on the message's sender (name and avatar URL).
-    * Metadata on the message's recipient (stream name + ID, topic,
-      private message recipients, etc.).
-    * A timestamp.
-    * The message's content.
+
+  - The numeric message ID generated by your Zulip server.
+  - Metadata on the message's sender (name and avatar URL).
+  - Metadata on the message's recipient (stream name + ID, topic,
+    private message recipients, etc.).
+  - A timestamp.
+  - The message's content.
 
   There's a `PUSH_NOTIFICATION_REDACT_CONTENT` setting available to
   disable any message content being sent via the push notification
   bouncer (i.e. message content will be replaced with
-  `***REDACTED***`).  Note that this setting makes push notifications
+  `***REDACTED***`). Note that this setting makes push notifications
   significantly less usable.
 
   We plan to
@@ -145,14 +149,15 @@ and privacy in mind:
   which would eliminate that usability tradeoff and additionally allow
   us to not have any access to the other details mentioned in this
   section.
-* All of the network requests (both from Zulip servers to the Push
+
+- All of the network requests (both from Zulip servers to the Push
   Notification Service and from the Push Notification Service to the
   relevant Google and Apple services) are encrypted over the wire with
   SSL/TLS.
-* The code for the push notification forwarding service is 100% open
+- The code for the push notification forwarding service is 100% open
   source and available as part of the
   [Zulip server project on GitHub](https://github.com/zulip/zulip).
-* The push notification forwarding servers are professionally managed
+- The push notification forwarding servers are professionally managed
   by a small team of security expert engineers.
 
 If you have any questions about the security model, contact
@@ -167,10 +172,11 @@ Zulip open source project understand how many people are using Zulip,
 and help us allocate resources towards supporting self-hosted
 installations.
 
-Our use of these statistics is governed by the same Terms of Service
-and Privacy Policy that covers the Mobile Push Notifications Service
-itself. If your organization does not want to submit these statistics,
-you can disable this feature at any time by setting
+Our use of these statistics is governed by the same [Terms of
+Service](https://zulip.com/policies/terms) and [Privacy
+Policy](https://zulip.com/policies/privacy) that covers the Mobile Push
+Notifications Service itself. If your organization does not want to submit these
+statistics, you can disable this feature at any time by setting
 `SUBMIT_USAGE_STATISTICS=False` in `/etc/zulip/settings.py`.
 
 ## Sending push notifications directly from your server
@@ -182,18 +188,18 @@ Zulip mobile apps.
 
 We don't recommend this path -- patching and shipping a production
 mobile app can take dozens of hours to set up even for an experienced
-developer, and even more time to maintain.  And it doesn't provide
+developer, and even more time to maintain. And it doesn't provide
 material privacy benefits -- your organization's push notification
 data would still go through Apple/Google's servers, just not Kandra
-Labs'.  Our view is the correct way to optimize for privacy is
-end-to-end encryption of push notifications.  But in the interest of
+Labs'. Our view is the correct way to optimize for privacy is
+end-to-end encryption of push notifications. But in the interest of
 transparency, we document in this section roughly what's involved in
 doing so.
 
 As we discussed above, it is impossible for a single app in their
 stores to receive push notifications from multiple, mutually
-untrusted, servers.  The Mobile Push Notification Service is one of
-the possible solutions to this problem.  The other possible solution
+untrusted, servers. The Mobile Push Notification Service is one of
+the possible solutions to this problem. The other possible solution
 is for an individual Zulip server's administrators to build and
 distribute their own copy of the Zulip mobile apps, hardcoding a key
 that they possess.
@@ -204,8 +210,8 @@ the Zulip mobile apps (and there's nothing the Zulip team can do to
 eliminate this onerous requirement).
 
 The main work is distributing your own copies of the Zulip mobile apps
-configured to use APNS/FCM keys that you generate.  This is not for
-the faint of heart!  If you haven't done this before, be warned that
+configured to use APNS/FCM keys that you generate. This is not for
+the faint of heart! If you haven't done this before, be warned that
 one can easily spend hundreds of dollars (on things like a DUNS number
 registration) and a week struggling through the hoops Apple requires
 to build and distribute an app through the Apple app store, even if
@@ -216,17 +222,18 @@ the app stores yourself.
 
 If you've done that work, the Zulip server configuration for sending
 push notifications through the new app is quite straightforward:
-* Create a
+
+- Create a
   [FCM push notifications](https://firebase.google.com/docs/cloud-messaging)
   key in the Google Developer console and set `android_gcm_api_key` in
   `/etc/zulip/zulip-secrets.conf` to that key.
-* Register for a
+- Register for a
   [mobile push notification certificate][apple-docs]
-  from Apple's developer console.  Set `APNS_SANDBOX=False` and
+  from Apple's developer console. Set `APNS_SANDBOX=False` and
   `APNS_CERT_FILE` to be the path of your APNS certificate file in
   `/etc/zulip/settings.py`.
-* Set the `APNS_TOPIC` and `ZULIP_IOS_APP_ID` settings to the ID for
+- Set the `APNS_TOPIC` and `ZULIP_IOS_APP_ID` settings to the ID for
   your app (for the official Zulip apps, they are both `org.zulip.Zulip`).
-* Restart the Zulip server.
+- Restart the Zulip server.
 
 [apple-docs]: https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/APNSOverview.html

docs/production/multiple-organizations.md

@@ -1,16 +1,16 @@
-```eval_rst
+```{eval-rst}
 :orphan:
 ```
 
 # Hosting multiple organizations
 
 The vast majority of Zulip servers host just a single organization (or
-"realm", as the Zulip code calls organizations).  This article
+"realm", as the Zulip code calls organizations). This article
 documents what's involved in hosting multiple Zulip organizations on a
 single server.
 
 Throughout this article, we'll assume you're working on a Zulip server
-with hostname `zulip.example.com`.  You may also find the more
+with hostname `zulip.example.com`. You may also find the more
 [technically focused article on realms](../subsystems/realms.md) to be useful
 reading.
 
@@ -18,7 +18,7 @@ reading.
 
 Zulip's approach for supporting multiple organizations on a single
 Zulip server is for each organization to be hosted on its own
-subdomain.  E.g. you'd have `org1.zulip.example.com` and
+subdomain. E.g. you'd have `org1.zulip.example.com` and
 `org2.zulip.example.com`.
 
 Web security standards mean that one subdomain per organization is
@@ -28,36 +28,36 @@ server at the same time.
 When you want to create a new organization, you need to do a few
 things:
 
-* If you're using Zulip older than 1.7, you'll need to set
+- If you're using Zulip older than 1.7, you'll need to set
   `REALMS_HAVE_SUBDOMAINS=True` in your `/etc/zulip/settings.py`
-  file.  That setting is the default in 1.7 and later.
-* Make sure you have SSL certificates for all of the subdomains you're
-  going to use.  If you're using
+  file. That setting is the default in 1.7 and later.
+- Make sure you have SSL certificates for all of the subdomains you're
+  going to use. If you're using
   [our Let's Encrypt instructions](ssl-certificates.md), it's easy to
   just specify multiple subdomains in your certificate request.
-* If necessary, modify your `nginx` configuration to use your new
+- If necessary, modify your `nginx` configuration to use your new
   certificates.
-* Use `./manage.py generate_realm_creation_link` again to create your
-  new organization.  Review
+- Use `./manage.py generate_realm_creation_link` again to create your
+  new organization. Review
   [the install instructions](install.md) if you need a
   refresher on how this works.
-* If you're planning on using GitHub auth or another social
+- If you're planning on using GitHub auth or another social
   authentication method, review
   [the notes on `SOCIAL_AUTH_SUBDOMAIN` below](#authentication).
 
 For servers hosting a large number of organizations, like
-[zulip.com](https://zulip.com), one can set `ROOT_DOMAIN_LANDING_PAGE
-= True` in `/etc/zulip/settings.py` so that the homepage for the
-server is a copy of the Zulip homepage.
+[zulip.com](https://zulip.com), one can set
+`ROOT_DOMAIN_LANDING_PAGE = True` in `/etc/zulip/settings.py` so that
+the homepage for the server is a copy of the Zulip homepage.
 
 ### SSL certificates
 
 You'll need to install an SSL certificate valid for all the
-(sub)domains you're using your Zulip server with.  You can get an SSL
+(sub)domains you're using your Zulip server with. You can get an SSL
 certificate covering several domains for free by using
 [our Certbot wrapper tool](../production/ssl-certificates.html#after-zulip-is-already-installed),
 though if you're going to host a large number of organizations, you
-may want to get a wildcard certificate.  You can also get a wildcard
+may want to get a wildcard certificate. You can also get a wildcard
 certificate for
 [free using Certbot](https://community.letsencrypt.org/t/getting-wildcard-certificates-with-certbot/56285),
 but because of the stricter security checks for acquiring a wildcard
@@ -71,7 +71,7 @@ If you'd like to use hostnames that are not subdomains of each other,
 you can set the `REALM_HOSTS` setting in `/etc/zulip/settings.py` to a
 Python dictionary, like this:
 
-```
+```python
 REALM_HOSTS = {
     'mysubdomain': 'hostname.example.com',
 }
@@ -86,7 +86,7 @@ into the database.
 ### The root domain
 
 Most Zulip servers host a single Zulip organization on the root domain
-(e.g. `zulip.example.com`).  The way this is implemented internally
+(e.g. `zulip.example.com`). The way this is implemented internally
 involves the organization having the empty string (`''`) as its
 "subdomain".
 
@@ -95,7 +95,7 @@ on subdomains (e.g. `subdivision.zulip.example.com`), but this only
 works well if there are no users in common between the two
 organizations, because the auth cookies for the root domain are
 visible to the subdomain (so it's not possible for a single
-browser/client to be logged into both).  So we don't recommend that
+browser/client to be logged into both). So we don't recommend that
 configuration.
 
 ### Authentication
@@ -103,7 +103,7 @@ configuration.
 Many of Zulip's supported authentication methods (Google, GitHub,
 SAML, etc.) can require providing the third-party authentication
 provider with a whitelist of callback URLs to your Zulip server (or
-even a single URL).  For those vendors that support a whitelist, you
+even a single URL). For those vendors that support a whitelist, you
 can provide the callback URLs for each of your Zulip organizations.
 
 The cleaner solution is to register a special subdomain, e.g.
@@ -118,10 +118,10 @@ avoid confusion as to why there's an extra realm when inspecting the
 Zulip database.
 
 Every Zulip server comes with 1 realm that isn't created by users: the
-`zulipinternal` realm.  By default, this realm only contains the Zulip "system
-bots".  You can get a list of these on your system via
+`zulipinternal` realm. By default, this realm only contains the Zulip "system
+bots". You can get a list of these on your system via
 `./scripts/get-django-setting INTERNAL_BOTS`, but this is where bots
-like "Notification Bot", "Welcome Bot", etc. exist.  In the future,
+like "Notification Bot", "Welcome Bot", etc. exist. In the future,
 we're considering moving these bots to exist in every realm, so that
 we wouldn't need the system realm anymore.
 

docs/production/password-strength.md

@@ -1,4 +1,4 @@
-```eval_rst
+```{eval-rst}
 :orphan:
 ```
 
@@ -8,18 +8,18 @@ When a user tries to set a password, we use [zxcvbn][zxcvbn] to check
 that it isn't a weak one.
 
 See discussion in [our main docs for server
-admins](../production/security-model.html#passwords).  This doc explains in more
+admins](../production/security-model.html#passwords). This doc explains in more
 detail how we set the default threshold (`PASSWORD_MIN_GUESSES`) we use.
 
-First, read the doc section there.  (It's short.)
+First, read the doc section there. (It's short.)
 
 Then, the CACM article ["Passwords and the Evolution of Imperfect
-Authentication"][BHOS15] is comprehensive, educational, and readable,
+Authentication"][bhos15] is comprehensive, educational, and readable,
 and is especially recommended.
 
 The CACM article is convincing that password requirements should be
 set to make passwords withstand an online attack, but not an offline
-one.  Offline attacks are much less common, and there is a wide gap in
+one. Offline attacks are much less common, and there is a wide gap in
 the level of password strength required to beat them vs that for
 online attacks -- and therefore in the level of user frustration that
 such a requirement would cause.
@@ -36,9 +36,9 @@ overestimation (allowing a weak password) sharply degrades at 100k
 guesses, while underestimation (rejecting a strong password) jumps up
 just after 10k guesses, and grows steadily thereafter.
 
-Moreover, the [Yahoo study][Bon12] shows that resistance to even 1M
+Moreover, the [Yahoo study][bon12] shows that resistance to even 1M
 guesses is more than nearly half of users accomplish with a freely
-chosen password, and 100k is too much for about 20%.  (See Figure 6.)
+chosen password, and 100k is too much for about 20%. (See Figure 6.)
 It doesn't make sense for a Zulip server to try to educate or push so
 many users far beyond the security practices they're accustomed to; in
 the few environments where users can be expected to work much harder
@@ -49,11 +49,11 @@ auth in Zulip entirely in favor of using that.
 
 Our threshold of 10k guesses provides significant protection against
 online attacks, and quite strong protection with appropriate
-rate-limiting.  On the other hand it stays within the range where
+rate-limiting. On the other hand it stays within the range where
 zxcvbn rarely underestimates the strength of a password too severely,
 and only about 10% of users do worse than this without prompting.
 
 [zxcvbn]: https://github.com/dropbox/zxcvbn
-[BHOS15]: https://www.cl.cam.ac.uk/~fms27/papers/2015-BonneauHerOorSta-passwords.pdf
+[bhos15]: https://www.cl.cam.ac.uk/~fms27/papers/2015-BonneauHerOorSta-passwords.pdf
 [zxcvbn-paper]: https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_wheeler.pdf
-[Bon12]: https://ieeexplore.ieee.org/document/6234435
+[bon12]: https://ieeexplore.ieee.org/document/6234435

docs/production/postgresql.md

@@ -1,13 +1,12 @@
-PostgreSQL database details
-=========================
+# PostgreSQL database details
 
 Starting with Zulip 3.0, Zulip supports a range of PostgreSQL
-versions.  PostgreSQL 13 is the current default for new installations;
+versions. PostgreSQL 13 is the current default for new installations;
 PostgreSQL 10, 11, and 12 are all supported.
 
 Previous versions of Zulip used whatever version of PostgreSQL was
 included with the base operating system (E.g. PostgreSQL 12 on Ubuntu
-Focal, 10 on Ubuntu Bionic, and 9.6 on Ubuntu Xenial).  We recommend
+Focal, 10 on Ubuntu Bionic, and 9.6 on Ubuntu Xenial). We recommend
 that installations currently using older PostgreSQL releases [upgrade
 to PostgreSQL 13][upgrade-postgresql], as we may drop support for
 older PostgreSQL in a future release.
@@ -32,34 +31,34 @@ called "zulip" in your database server. You can configure these
 options in `/etc/zulip/settings.py` (the below descriptions are from the
 PostgreSQL documentation):
 
-* `REMOTE_POSTGRES_HOST`: Name or IP address of the remote host
-* `REMOTE_POSTGRES_SSLMODE`: SSL Mode used to connect to the server,
+- `REMOTE_POSTGRES_HOST`: Name or IP address of the remote host
+- `REMOTE_POSTGRES_SSLMODE`: SSL Mode used to connect to the server,
   different options you can use are:
-  * disable: I don't care about security, and I don't want to pay the
+  - disable: I don't care about security, and I don't want to pay the
     overhead of encryption.
-  * allow: I don't care about security, but I will pay the overhead of
+  - allow: I don't care about security, but I will pay the overhead of
     encryption if the server insists on it.
-  * prefer: I don't care about encryption, but I wish to pay the
+  - prefer: I don't care about encryption, but I wish to pay the
     overhead of encryption if the server supports it.
-  * require: I want my data to be encrypted, and I accept the
+  - require: I want my data to be encrypted, and I accept the
     overhead. I trust that the network will make sure I always connect
     to the server I want.
-  * verify-ca: I want my data encrypted, and I accept the overhead. I
+  - verify-ca: I want my data encrypted, and I accept the overhead. I
     want to be sure that I connect to a server that I trust.
-  * verify-full: I want my data encrypted, and I accept the
+  - verify-full: I want my data encrypted, and I accept the
     overhead. I want to be sure that I connect to a server I trust,
     and that it's the one I specify.
 
 Then you should specify the password of the user zulip for the
 database in /etc/zulip/zulip-secrets.conf:
 
-```
+```ini
 postgres_password = xxxx
 ```
 
 Finally, you can stop your database on the Zulip server via:
 
-```
+```bash
 sudo service postgresql stop
 sudo update-rc.d postgresql disable
 ```
@@ -76,7 +75,7 @@ can give you some tips.
 When debugging PostgreSQL issues, in addition to the standard `pg_top`
 tool, often it can be useful to use this query:
 
-```
+```postgresql
 SELECT procpid,waiting,query_start,current_query FROM pg_stat_activity ORDER BY procpid;
 ```
 
@@ -84,20 +83,21 @@ which shows the currently running backends and their activity. This is
 similar to the pg_top output, with the added advantage of showing the
 complete query, which can be valuable in debugging.
 
-To stop a runaway query, you can run `SELECT pg_cancel_backend(pid
-int)` or `SELECT pg_terminate_backend(pid int)` as the 'postgres'
-user. The former cancels the backend's current query and the latter
-terminates the backend process. They are implemented by sending SIGINT
-and SIGTERM to the processes, respectively.  We recommend against
-sending a PostgreSQL process SIGKILL. Doing so will cause the database
-to kill all current connections, roll back any pending transactions,
-and enter recovery mode.
+To stop a runaway query, you can run
+`SELECT pg_cancel_backend(pid int)` or
+`SELECT pg_terminate_backend(pid int)` as the 'postgres' user. The
+former cancels the backend's current query and the latter terminates
+the backend process. They are implemented by sending SIGINT and
+SIGTERM to the processes, respectively. We recommend against sending
+a PostgreSQL process SIGKILL. Doing so will cause the database to kill
+all current connections, roll back any pending transactions, and enter
+recovery mode.
 
 #### Stopping the Zulip PostgreSQL database
 
 To start or stop PostgreSQL manually, use the pg_ctlcluster command:
 
-```
+```bash
 pg_ctlcluster 9.1 [--force] main {start|stop|restart|reload}
 ```
 
@@ -107,15 +107,15 @@ prohibitively long. If you use the --force option with stop,
 pg_ctlcluster will try to use the "fast" mode for shutting
 down. "Fast" mode is described by the manpage thusly:
 
-  With the --force option the "fast" mode is used which rolls back all
-  active transactions, disconnects clients immediately and thus shuts
-  down cleanly. If that does not work, shutdown is attempted again in
-  "immediate" mode, which can leave the cluster in an inconsistent state
-  and thus will lead to a recovery run at the next start. If this still
-  does not help, the postmaster process is killed. Exits with 0 on
-  success, with 2 if the server is not running, and with 1 on other
-  failure conditions. This mode should only be used when the machine is
-  about to be shut down.
+> With the --force option the "fast" mode is used which rolls back all
+> active transactions, disconnects clients immediately and thus shuts
+> down cleanly. If that does not work, shutdown is attempted again in
+> "immediate" mode, which can leave the cluster in an inconsistent state
+> and thus will lead to a recovery run at the next start. If this still
+> does not help, the postmaster process is killed. Exits with 0 on
+> success, with 2 if the server is not running, and with 1 on other
+> failure conditions. This mode should only be used when the machine is
+> about to be shut down.
 
 Many database parameters can be adjusted while the database is
 running. Just modify /etc/postgresql/9.1/main/postgresql.conf and
@@ -128,7 +128,7 @@ database failed to start. It may tell you to check the logs, but you
 won't find any information there. pg_ctlcluster runs the following
 command underneath when it actually goes to start PostgreSQL:
 
-```
+```bash
 /usr/lib/postgresql/9.1/bin/pg_ctl start -D /var/lib/postgresql/9.1/main -s -o \
     '-c config_file="/etc/postgresql/9.1/main/postgresql.conf"'
 ```
@@ -139,13 +139,12 @@ stop PostgreSQL and restart it using pg_ctlcluster after you've debugged
 with this approach, since it does bypass some of the work that
 pg_ctlcluster does.
 
-
 #### PostgreSQL vacuuming alerts
 
 The `autovac_freeze` PostgreSQL alert from `check_postgres` is
-particularly important.  This alert indicates that the age (in terms
+particularly important. This alert indicates that the age (in terms
 of number of transactions) of the oldest transaction id (XID) is
-getting close to the `autovacuum_freeze_max_age` setting.  When the
+getting close to the `autovacuum_freeze_max_age` setting. When the
 oldest XID hits that age, PostgreSQL will force a VACUUM operation,
 which can often lead to sudden downtime until the operation finishes.
 If it did not do this and the age of the oldest XID reached 2 billion,

docs/production/requirements.md

@@ -1,65 +1,70 @@
 # Requirements and scalability
 
 To run a Zulip server, you will need:
-* A dedicated machine or VM
-* A supported OS:
-  * Ubuntu 20.04 Focal
-  * Ubuntu 18.04 Bionic
-  * Debian 10 Buster
-* At least 2GB RAM, and 10GB disk space
-  * If you expect 100+ users: 4GB RAM, and 2 CPUs
-* A hostname in DNS
-* Credentials for sending email
+
+- A dedicated machine or VM
+- A supported OS:
+  - Ubuntu 20.04 Focal
+  - Ubuntu 18.04 Bionic
+  - Debian 11 Bullseye
+  - Debian 10 Buster
+- At least 2GB RAM, and 10GB disk space
+  - If you expect 100+ users: 4GB RAM, and 2 CPUs
+  - If you intend to [upgrade from Git][upgrade-from-git]: 3GB RAM, or
+    2G and at least 1G of swap configured.
+- A hostname in DNS
+- Credentials for sending email
 
 For details on each of these requirements, see below.
 
+[upgrade-from-git]: ../production/upgrade-or-modify.html#upgrading-from-a-git-repository
+
 ## Server
 
 #### General
 
 The installer expects Zulip to be the **only thing** running on the
 system; it will install system packages with `apt` (like Nginx,
-PostgreSQL, and Redis) and configure them for its own use.  We
+PostgreSQL, and Redis) and configure them for its own use. We
 strongly recommend using either a fresh machine instance in a cloud
-provider, a fresh VM, or a dedicated machine.  If you decide to
+provider, a fresh VM, or a dedicated machine. If you decide to
 disregard our advice and use a server that hosts other services, we
 can't support you, but
 [we do have some notes on issues you'll encounter](install-existing-server.md).
 
 #### Operating system
 
-Ubuntu 20.04 Focal, 18.04 Bionic, and Debian 10 Buster are supported
-for running Zulip in production.  64-bit is recommended.  We recommend
-installing on the newest supported OS release you're comfortable with,
-to save a bit of future work [upgrading the operating
+Ubuntu 20.04 Focal, 18.04 Bionic, Debian 11 Bullseye, and Debian 10 Buster
+are supported for running Zulip in production. 64-bit is recommended.
+We recommend installing on the newest supported OS release you're
+comfortable with, to save a bit of future work [upgrading the operating
 system][upgrade-os].
 
 If you're using Ubuntu, the
 [Ubuntu universe repository][ubuntu-repositories] must be
 [enabled][enable-universe], which is usually just:
 
-```
+```bash
 sudo add-apt-repository universe
 sudo apt update
 ```
 
 [upgrade-os]: ../production/upgrade-or-modify.html#upgrading-the-operating-system
-[ubuntu-repositories]:
-https://help.ubuntu.com/community/Repositories/Ubuntu
+[ubuntu-repositories]: https://help.ubuntu.com/community/Repositories/Ubuntu
 [enable-universe]: https://help.ubuntu.com/community/Repositories/CommandLine#Adding_the_Universe_and_Multiverse_Repositories
 
 #### Hardware specifications
 
-* CPU and memory: For installations with 100+ users you'll need a
+- CPU and memory: For installations with 100+ users you'll need a
   minimum of **2 CPUs** and **4GB RAM**. For installations with fewer
   users, 1 CPU and 2GB RAM is sufficient. We strongly recommend against
   installing with less than 2GB of RAM, as you will likely experience
-  out of memory issues installing dependencies.  We recommend against
+  out of memory issues installing dependencies. We recommend against
   using highly CPU-limited servers like the AWS `t2` style instances
   for organizations with hundreds of users (active or no).
 
-* Disk space: You'll need at least 10GB of free disk space for a
-  server with dozens of users.  We recommend using an SSD and avoiding
+- Disk space: You'll need at least 10GB of free disk space for a
+  server with dozens of users. We recommend using an SSD and avoiding
   cloud storage backends that limit the IOPS per second, since the
   disk is primarily used for the Zulip database.
 
@@ -68,45 +73,51 @@ on hardware requirements for larger organizations.
 
 #### Network and security specifications
 
-* Incoming HTTPS access (usually port 443, though this is
+- Incoming HTTPS access (usually port 443, though this is
   [configurable](../production/deployment.html#using-an-alternate-port))
   from the networks where your users are (usually, the public
   Internet).
-* Incoming port 80 access (optional).  Zulip only serves content over
+- Incoming port 80 access (optional). Zulip only serves content over
   HTTPS, and will redirect HTTP requests to HTTPS.
-* Incoming port 25 if you plan to enable Zulip's [incoming email
+- Incoming port 25 if you plan to enable Zulip's [incoming email
   integration](../production/email-gateway.md).
-* Outgoing HTTP(S) access (ports 80 and 443) to the public Internet so
+- Incoming port 4369 should be protected by a firewall to prevent
+  exposing `epmd`, an Erlang service which does not support binding
+  only to localhost. Leaving this exposed will allow unauthenticated
+  remote users to determine that the server is running RabbitMQ, and
+  on which port, though no further information is leaked.
+- Outgoing HTTP(S) access (ports 80 and 443) to the public Internet so
   that Zulip can properly manage image and website previews and mobile
-  push notifications.  Outgoing Internet access is not required if you
+  push notifications. Outgoing Internet access is not required if you
   [disable those
   features](https://zulip.com/help/allow-image-link-previews).
-* Outgoing SMTP access (usually port 587) to your [SMTP
+- Outgoing SMTP access (usually port 587) to your [SMTP
   server](../production/email.md) so that Zulip can send emails.
-* A domain name (e.g. `zulip.example.com`) that your users will use to
-  access the Zulip server.  In order to generate valid SSL
+- A domain name (e.g. `zulip.example.com`) that your users will use to
+  access the Zulip server. In order to generate valid SSL
   certificates [with Certbot][doc-certbot], and to enable other
   services such as Google authentication, public DNS name is simpler,
   but Zulip can be configured to use a non-public domain or even an IP
   address as its external hostname (though we don't recommend that
   configuration).
-* Zulip supports [running behind a reverse proxy][reverse-proxy].
-* Zulip servers running inside a private network should configure the
-  [Smokescreen integration][smokescreen-proxy] to protect against
-  [SSRF attacks][SSRF], where users could make the Zulip server make
-  requests to private resources.
+- Zulip supports [running behind a reverse proxy][reverse-proxy].
+- Zulip configures [Smokescreen, and outgoing HTTP
+  proxy][smokescreen-proxy], to protect against [SSRF attacks][ssrf],
+  which prevents user from making the Zulip server make requests to
+  private resources. If your network has its own outgoing HTTP proxy,
+  Zulip supports using that instead.
 
-[SSRF]: https://owasp.org/www-community/attacks/Server_Side_Request_Forgery
-[smokescreen-proxy]: ../production/deployment.html#using-an-outgoing-http-proxy
+[ssrf]: https://owasp.org/www-community/attacks/Server_Side_Request_Forgery
+[smokescreen-proxy]: ../production/deployment.html#customizing-the-outgoing-http-proxy
 [reverse-proxy]: ../production/deployment.html#putting-the-zulip-application-behind-a-reverse-proxy
-[email-mirror-code]: https://github.com/zulip/zulip/blob/master/zerver/management/commands/email_mirror.py
+[email-mirror-code]: https://github.com/zulip/zulip/blob/main/zerver/management/commands/email_mirror.py
 
 ## Credentials needed
 
 #### SSL certificate
 
 Your Zulip server will need an SSL certificate for the domain name it
-uses.  For most Zulip servers, the recommended (and simplest) way to
+uses. For most Zulip servers, the recommended (and simplest) way to
 get this is to just [use the `--certbot` option][doc-certbot] in the
 Zulip installer, which will automatically get a certificate for you
 and keep it renewed.
@@ -123,10 +134,10 @@ certificate documentation](ssl-certificates.md).
 
 #### Outgoing email
 
-* Outgoing email (SMTP) credentials that Zulip can use to send
+- Outgoing email (SMTP) credentials that Zulip can use to send
   outgoing emails to users (e.g. email address confirmation emails
   during the signup process, message notification emails, password
-  reset, etc.).  If you don't have an existing outgoing SMTP solution,
+  reset, etc.). If you don't have an existing outgoing SMTP solution,
   read about
   [free outgoing SMTP options and options for prototyping](email.html#free-outgoing-email-services).
 
@@ -139,80 +150,82 @@ Zulip in production](../production/install.md).
 
 This section details some basic guidelines for running a Zulip server
 for larger organizations (especially >1000 users or 500+ daily active
-users).  Zulip's resource needs depend mainly on 3 parameters:
-* daily active users (e.g. number of employees if everyone's an
-employee)
-* total user accounts (can be much larger)
-* message volume.
+users). Zulip's resource needs depend mainly on 3 parameters:
+
+- daily active users (e.g. number of employees if everyone's an
+  employee)
+- total user accounts (can be much larger)
+- message volume.
 
 In the following, we discuss a configuration with at most two types of
 servers: application servers (running Django, Tornado, RabbitMQ,
-Redis, Memcached, etc.) and database servers.  Of the application
-server services, Django dominates the resource requirements.  One can
+Redis, Memcached, etc.) and database servers. Of the application
+server services, Django dominates the resource requirements. One can
 run every service on its own system (as
 [docker-zulip](https://github.com/zulip/docker-zulip) does) but for
-most use cases, there's little scalability benefit to doing so.  See
+most use cases, there's little scalability benefit to doing so. See
 [deployment options](../production/deployment.md) for details on
 installing Zulip with a dedicated database server.
 
-* **Dedicated database**.  For installations with hundreds of daily
+- **Dedicated database**. For installations with hundreds of daily
   active users, we recommend using a [remote PostgreSQL
   database](postgresql.md), but it's not required.
 
-* **RAM:**  We recommended more RAM for larger installations:
-    * With 25+ daily active users, 4GB of RAM.
-    * With 100+ daily active users, 8GB of RAM.
-    * With 400+ daily active users, 16GB of RAM for the Zulip
-      application server, plus 16GB for the database.
-    * With 2000+ daily active users 32GB of RAM, plus 32GB for the
-      database.
-    * Roughly linear scaling beyond that.
+- **RAM:** We recommended more RAM for larger installations:
 
-* **CPU:**  The Zulip application server's CPU usage is heavily
+  - With 25+ daily active users, 4GB of RAM.
+  - With 100+ daily active users, 8GB of RAM.
+  - With 400+ daily active users, 16GB of RAM for the Zulip
+    application server, plus 16GB for the database.
+  - With 2000+ daily active users 32GB of RAM, plus 32GB for the
+    database.
+  - Roughly linear scaling beyond that.
+
+- **CPU:** The Zulip application server's CPU usage is heavily
   optimized due to extensive work on optimizing the performance of
-  requests for latency reasons.  Because most servers with sufficient
+  requests for latency reasons. Because most servers with sufficient
   RAM have sufficient CPU resources, CPU requirements are rarely an
-  issue.  For larger installations with a dedicated database, we
+  issue. For larger installations with a dedicated database, we
   recommend high-CPU instances for the application server and a
   database-optimized (usually low CPU, high memory) instance for the
   database.
 
-* **Disk for application server:** We recommend using [the S3 file
-  uploads backend][s3-uploads] to store uploaded files at scale.  With
+- **Disk for application server:** We recommend using [the S3 file
+  uploads backend][s3-uploads] to store uploaded files at scale. With
   the S3 backend configuration, we recommend 50GB of disk for the OS,
-  Zulip software, logs and scratch/free space.  Disk needs when
+  Zulip software, logs and scratch/free space. Disk needs when
   storing uploads locally
 
-* **Disk for database:** SSD disk is highly recommended.  For
+- **Disk for database:** SSD disk is highly recommended. For
   installations where most messages have <100 recipients, 10GB per 1M
   messages of history is sufficient plus 1GB per 1000 users is
-  sufficient.  If most messages are to public streams with 10K+ users
+  sufficient. If most messages are to public streams with 10K+ users
   subscribed (like on chat.zulip.org), add 20GB per (1000 user
   accounts) per (1M messages to public streams).
 
-* **Example:** When the
+- **Example:** When the
   [chat.zulip.org](../contributing/chat-zulip-org.md) community server
   had 12K user accounts (~300 daily actives) and 800K messages of
   history (400K to public streams), it was a default configuration
   single-server installation with 16GB of RAM, 4 cores (essentially
   always idle), and its database was using about 100GB of disk.
 
-* **Disaster recovery:** One can easily run a hot spare application
+- **Disaster recovery:** One can easily run a hot spare application
   server and a hot spare database (using [PostgreSQL streaming
-  replication][streaming-replication]).  Make sure the hot spare
+  replication][streaming-replication]). Make sure the hot spare
   application server has copies of `/etc/zulip` and you're either
   syncing `LOCAL_UPLOADS_DIR` or using the [S3 file uploads
   backend][s3-uploads].
 
-* **Sharding:** Zulip releases do not fully support dividing Tornado
+- **Sharding:** Zulip releases do not fully support dividing Tornado
   traffic for a single Zulip realm/organization between multiple
   application servers, which is why we recommend a hot spare over
-  load-balancing.  We don't have an easily deployed configuration for
+  load-balancing. We don't have an easily deployed configuration for
   load-balancing Tornado within a single organization, and as a result
   can't currently offer this model outside of enterprise support
   contracts.
 
-  * Zulip 2.0 and later supports running multiple Tornado servers
+  - Zulip 2.0 and later supports running multiple Tornado servers
     sharded by realm/organization, which is how we scale Zulip Cloud.
     [Contact us][contact-support] for help implementing the sharding policy.
 

docs/production/security-model.md

@@ -1,6 +1,6 @@
 # Security model
 
-This section attempts to document the Zulip security model.  It likely
+This section attempts to document the Zulip security model. It likely
 does not cover every issue; if there are details you're curious about,
 please feel free to ask questions in [#production
 help](https://chat.zulip.org/#narrow/stream/31-production-help) on the
@@ -11,7 +11,7 @@ announcement).
 
 ## Secure your Zulip server like your email server
 
-* It's reasonable to think about security for a Zulip server like you
+- It's reasonable to think about security for a Zulip server like you
   do security for a team email server -- only trusted individuals
   within an organization should have shell access to the server.
 
@@ -19,7 +19,7 @@ announcement).
   or Zulip database server, or with access to the `zulip` user on a
   Zulip application server, has complete control over the Zulip
   installation and all of its data (so they can read messages, modify
-  history, etc.).  It would be difficult or impossible to avoid this,
+  history, etc.). It would be difficult or impossible to avoid this,
   because the server needs access to the data to support features
   expected of a group chat system like the ability to search the
   entire message history, and thus someone with control over the
@@ -27,17 +27,17 @@ announcement).
 
 ## Encryption and authentication
 
-* Traffic between clients (web, desktop and mobile) and the Zulip
-  server is encrypted using HTTPS.  By default, all Zulip services
+- Traffic between clients (web, desktop and mobile) and the Zulip
+  server is encrypted using HTTPS. By default, all Zulip services
   talk to each other either via a localhost connection or using an
   encrypted SSL connection.
 
-* Zulip requires CSRF tokens in all interactions with the web API to
+- Zulip requires CSRF tokens in all interactions with the web API to
   prevent CSRF attacks.
 
-* The preferred way to log in to Zulip is using an SSO solution like
+- The preferred way to log in to Zulip is using an SSO solution like
   Google auth, LDAP, or similar, but Zulip also supports password
-  authentication.  See
+  authentication. See
   [the authentication methods documentation](../production/authentication-methods.md)
   for details on Zulip's available authentication methods.
 
@@ -46,16 +46,16 @@ announcement).
 Zulip stores user passwords using the standard PBKDF2 algorithm.
 
 When the user is choosing a password, Zulip checks the password's
-strength using the popular [zxcvbn][zxcvbn] library.  Weak passwords
-are rejected, and strong passwords encouraged.  The minimum password
+strength using the popular [zxcvbn][zxcvbn] library. Weak passwords
+are rejected, and strong passwords encouraged. The minimum password
 strength allowed is controlled by two settings in
 `/etc/zulip/settings.py`:
 
-* `PASSWORD_MIN_LENGTH`: The minimum acceptable length, in characters.
+- `PASSWORD_MIN_LENGTH`: The minimum acceptable length, in characters.
   Shorter passwords are rejected even if they pass the `zxcvbn` test
   controlled by `PASSWORD_MIN_GUESSES`.
 
-* `PASSWORD_MIN_GUESSES`: The minimum acceptable strength of the
+- `PASSWORD_MIN_GUESSES`: The minimum acceptable strength of the
   password, in terms of the estimated number of passwords an attacker
   is likely to guess before trying this one. If the user attempts to
   set a password that `zxcvbn` estimates to be guessable in less than
@@ -70,10 +70,10 @@ strength allowed is controlled by two settings in
   Estimating the guessability of a password is a complex problem and
   impossible to efficiently do perfectly. For background or when
   considering an alternate value for this setting, the article
-  ["Passwords and the Evolution of Imperfect Authentication"][BHOS15]
-  is recommended.  The [2016 zxcvbn paper][zxcvbn-paper] adds useful
+  ["Passwords and the Evolution of Imperfect Authentication"][bhos15]
+  is recommended. The [2016 zxcvbn paper][zxcvbn-paper] adds useful
   information about the performance of zxcvbn, and [a large 2012 study
-  of Yahoo users][Bon12] is informative about the strength of the
+  of Yahoo users][bon12] is informative about the strength of the
   passwords users choose.
 
 <!---
@@ -86,59 +86,60 @@ strength allowed is controlled by two settings in
 -->
 
 [zxcvbn]: https://github.com/dropbox/zxcvbn
-[BHOS15]: http://www.cl.cam.ac.uk/~fms27/papers/2015-BonneauHerOorSta-passwords.pdf
+[bhos15]: http://www.cl.cam.ac.uk/~fms27/papers/2015-BonneauHerOorSta-passwords.pdf
 [zxcvbn-paper]: https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_wheeler.pdf
-[Bon12]: http://ieeexplore.ieee.org/document/6234435/
+[bon12]: http://ieeexplore.ieee.org/document/6234435/
 
 ## Messages and history
 
-* Zulip message content is rendered using a specialized Markdown
+- Zulip message content is rendered using a specialized Markdown
   parser which escapes content to protect against cross-site scripting
   attacks.
 
-* Zulip supports both public streams and private streams.
-  * Any non-guest user can join any public stream in the organization,
+- Zulip supports both public streams and private streams.
+
+  - Any non-guest user can join any public stream in the organization,
     and can view the complete message history of any public stream
-    without joining the stream.  Guests can only access streams that
+    without joining the stream. Guests can only access streams that
     another user adds them to.
 
-  * Organization owners and administrators can see and modify most
+  - Organization owners and administrators can see and modify most
     aspects of a private stream, including the membership and
     estimated traffic. Owners and administrators generally cannot see
     messages sent to private streams or do things that would
     indirectly give them access to those messages, like adding members
     or changing the stream privacy settings.
 
-  * Non-admins cannot easily see which private streams exist, or interact
+  - Non-admins cannot easily see which private streams exist, or interact
     with them in any way until they are added. Given a stream name, they can
     figure out whether a stream with that name exists, but cannot see any
     other details about the stream.
 
-  * See [Stream permissions](https://zulip.com/help/stream-permissions) for more details.
+  - See [Stream permissions](https://zulip.com/help/stream-permissions) for more details.
 
-* Zulip supports editing the content and topics of messages that have
+- Zulip supports editing the content and topics of messages that have
   already been sent. As a general philosophy, our policies provide
   hard limits on the ways in which message content can be changed or
   undone. In contrast, our policies around message topics favor
   usefulness (e.g. for conversational organization) over faithfulness
   to the original. In all configurations:
 
-  * Message content can only ever be modified by the original author.
+  - Message content can only ever be modified by the original author.
 
-  * Any message visible to an organization owner or administrator can
+  - Any message visible to an organization owner or administrator can
     be deleted at any time by that administrator.
 
-  * See
+  - See
     [Configuring message editing and deletion](https://zulip.com/help/configure-message-editing-and-deletion)
     for more details.
 
 ## Users and bots
 
-* There are several types of users in a Zulip organization: organization
+- There are several types of users in a Zulip organization: organization
   owners, organization administrators, members (normal users), guests,
   and bots.
 
-* Owners and administrators have the ability to deactivate and
+- Owners and administrators have the ability to deactivate and
   reactivate other human and bot users, archive streams, add/remove
   administrator privileges, as well as change configuration for the
   organization.
@@ -148,47 +149,47 @@ strength allowed is controlled by two settings in
   streams to which the administrator is not subscribed. There are two
   exceptions:
 
-  * Organization owners may get access to private messages via some types of
+  - Organization owners may get access to private messages via some types of
     [data export](https://zulip.com/help/export-your-organization).
 
-  * Administrators can change the ownership of a bot. If a bot is subscribed
+  - Administrators can change the ownership of a bot. If a bot is subscribed
     to a private stream, then an administrator can indirectly get access to
     stream messages by taking control of the bot, though the access will be
     limited to what the bot can do. (E.g. incoming webhook bots cannot read
     messages.)
 
-* Every Zulip user has an API key, available on the settings page.
+- Every Zulip user has an API key, available on the settings page.
   This API key can be used to do essentially everything the user can
-  do; for that reason, users should keep their API key safe.  Users
+  do; for that reason, users should keep their API key safe. Users
   can rotate their own API key if it is accidentally compromised.
 
-* To properly remove a user's access to a Zulip team, it does not
+- To properly remove a user's access to a Zulip team, it does not
   suffice to change their password or deactivate their account in a
   SSO system, since neither of those prevents authenticating with the
-  user's API key or those of bots the user has created.  Instead, you
+  user's API key or those of bots the user has created. Instead, you
   should
   [deactivate the user's account](https://zulip.com/help/deactivate-or-reactivate-a-user)
   via Zulip's "Organization settings" interface.
 
-* The Zulip mobile apps authenticate to the server by sending the
+- The Zulip mobile apps authenticate to the server by sending the
   user's password and retrieving the user's API key; the apps then use
   the API key to authenticate all future interactions with the site.
   Thus, if a user's phone is lost, in addition to changing passwords,
   you should rotate the user's Zulip API key.
 
-* Guest users are like Members, but they do not have automatic access
+- Guest users are like Members, but they do not have automatic access
   to public streams.
 
-* Zulip supports several kinds of bots with different capabilities.
+- Zulip supports several kinds of bots with different capabilities.
 
-  * Incoming webhook bots can only send messages into Zulip.
-  * Outgoing webhook bots and Generic bots can essentially do anything a
+  - Incoming webhook bots can only send messages into Zulip.
+  - Outgoing webhook bots and Generic bots can essentially do anything a
     non-administrator user can, with a few exceptions (e.g. a bot cannot
     log in to the web application, register for mobile push
     notifications, or create other bots).
-  * Bots with the `can_forge_sender` permission can send messages that appear to have been sent by
+  - Bots with the `can_forge_sender` permission can send messages that appear to have been sent by
     another user. They also have the ability to see the names of all
-    streams, including private streams.  This is important for implementing
+    streams, including private streams. This is important for implementing
     integrations like the Jabber, IRC, and Zephyr mirrors.
 
     These bots cannot be created by Zulip users, including
@@ -197,14 +198,14 @@ strength allowed is controlled by two settings in
 
 ## User-uploaded content and user-generated requests
 
-* Zulip supports user-uploaded files.  Ideally they should be hosted
+- Zulip supports user-uploaded files. Ideally they should be hosted
   from a separate domain from the main Zulip server to protect against
   various same-domain attacks (e.g. zulip-user-content.example.com).
 
   We support two ways of hosting them: the basic `LOCAL_UPLOADS_DIR`
   file storage backend, where they are stored in a directory on the
   Zulip server's filesystem, and the S3 backend, where the files are
-  stored in Amazon S3.  It would not be difficult to add additional
+  stored in Amazon S3. It would not be difficult to add additional
   supported backends should there be a need; see
   `zerver/lib/upload.py` for the full interface.
 
@@ -221,11 +222,11 @@ strength allowed is controlled by two settings in
   provide additional layers of protection in both backends as well.
 
   In the Zulip S3 backend, the random URLs to access files that are
-  presented to users don't actually host the content.  Instead, the S3
+  presented to users don't actually host the content. Instead, the S3
   backend verifies that the user has a valid Zulip session in the
   relevant organization (and that has access to a Zulip message linking to
   the file), and if so, then redirects the browser to a temporary S3
-  URL for the file that expires a short time later.  In this way,
+  URL for the file that expires a short time later. In this way,
   possessing a URL to a secret file in Zulip does not provide
   unauthorized users with access to that file.
 
@@ -235,35 +236,41 @@ strength allowed is controlled by two settings in
   browser is logged into a Zulip account that has received the
   uploaded file in question).
 
-* Zulip supports using the Camo image proxy to proxy content like
+- Zulip supports using the [go-camo][go-camo] image proxy to proxy content like
   inline image previews, that can be inserted into the Zulip message feed by
   other users. This ensures that clients do not make requests to external
   servers to fetch images, improving privacy.
 
-* By default, Zulip will provide image previews inline in the body of
-  messages when a message contains a link to an image.  You can
+- By default, Zulip will provide image previews inline in the body of
+  messages when a message contains a link to an image. You can
   control this using the `INLINE_IMAGE_PREVIEW` setting.
 
-* Zulip may make outgoing HTTP connections to other servers in a
+- Zulip may make outgoing HTTP connections to other servers in a
   number of cases:
 
-  * Outgoing webhook bots (creation of which can be restricted)
-  * Inline image previews in messages (enabled by default, but can be disabled)
-  * Inline webpage previews and embeds (must be configured to be enabled)
-  * Twitter message previews (must be configured to be enabled)
-  * BigBlueButton and Zoom API requests (must be configured to be enabled)
-  * Mobile push notifications (must be configured to be enabled)
+  - Outgoing webhook bots (creation of which can be restricted)
+  - Inline image previews in messages (enabled by default, but can be disabled)
+  - Inline webpage previews and embeds (must be configured to be enabled)
+  - Twitter message previews (must be configured to be enabled)
+  - BigBlueButton and Zoom API requests (must be configured to be enabled)
+  - Mobile push notifications (must be configured to be enabled)
 
-* Notably, these first 3 features give end users (limited) control to cause
-  the Zulip server to make HTTP requests on their behalf.  As a result,
-  Zulip supports routing all outgoing outgoing HTTP requests [through
+- Notably, these first 3 features give end users (limited) control to cause
+  the Zulip server to make HTTP requests on their behalf. Because of this,
+  Zulip routes all outgoing outgoing HTTP requests [through
   Smokescreen][smokescreen-setup] to ensure that Zulip cannot be
-  used to execute [SSRF attacks][SSRF] against other systems on an
-  internal corporate network.  The default Smokescreen configuration
+  used to execute [SSRF attacks][ssrf] against other systems on an
+  internal corporate network. The default Smokescreen configuration
   denies access to all non-public IP addresses, including 127.0.0.1.
 
-[SSRF]: https://owasp.org/www-community/attacks/Server_Side_Request_Forgery
-[smokescreen-setup]: ../production/deployment.html#using-an-outgoing-http-proxy
+  The Camo image server does not, by default, route its traffic
+  through Smokescreen, since Camo includes logic to deny access to
+  private subnets; this can be [overridden][proxy.enable_for_camo].
+
+[go-camo]: https://github.com/cactus/go-camo
+[ssrf]: https://owasp.org/www-community/attacks/Server_Side_Request_Forgery
+[smokescreen-setup]: ../production/deployment.html#customizing-the-outgoing-http-proxy
+[proxy.enable_for_camo]: ../production/deployment.html#enable-for-camo
 
 ## Final notes and security response
 

docs/production/settings.md

@@ -12,10 +12,11 @@ administrators][realm-admin-docs].
 [realm-admin-docs]: https://zulip.com/help/getting-your-organization-started-with-zulip
 
 This page discusses additional configuration that a system
-administrator can do.  To change any of the following settings, edit
+administrator can do. To change any of the following settings, edit
 the `/etc/zulip/settings.py` file on your Zulip server, and then
 restart the server with the following command:
-```
+
+```bash
 su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
 ```
 
@@ -28,7 +29,7 @@ comment documentation for new configuration settings after upgrading
 to each new major release.
 
 [update-settings-docs]: ../production/upgrade-or-modify.html#updating-settings-py-inline-documentation
-[settings-py-template]: https://github.com/zulip/zulip/blob/master/zproject/prod_settings_template.py
+[settings-py-template]: https://github.com/zulip/zulip/blob/main/zproject/prod_settings_template.py
 
 Since Zulip's settings file is a Python script, there are a number of
 other things that one can configure that are not documented; ask on
@@ -42,12 +43,12 @@ if there's something you'd like to do but can't figure out how to.
 `EXTERNAL_HOST`: the user-accessible domain name for your Zulip
 installation (i.e., what users will type in their web browser). This
 should of course match the DNS name you configured to point to your
-server and for which you configured SSL certificates.  If you passed
+server and for which you configured SSL certificates. If you passed
 `--hostname` to the installer, this will be prefilled with that value.
 
 `ZULIP_ADMINISTRATOR`: the email address of the person or team
 maintaining this installation and who will get support and error
-emails.  If you passed `--email` to the installer, this will be
+emails. If you passed `--email` to the installer, this will be
 prefilled with that value.
 
 ### Authentication backends
@@ -68,14 +69,14 @@ them.
 
 The Zulip apps expect to be talking to servers with a properly
 signed SSL certificate, in most cases and will not accept a
-self-signed certificate.  You should get a proper SSL certificate
+self-signed certificate. You should get a proper SSL certificate
 before testing the apps.
 
 Because of how Google and Apple have architected the security model of
 their push notification protocols, the Zulip mobile apps for
 [iOS](https://itunes.apple.com/us/app/zulip/id1203036395) and
 [Android](https://play.google.com/store/apps/details?id=com.zulipmobile)
-can only receive push notifications from a single Zulip server.  We
+can only receive push notifications from a single Zulip server. We
 have configured that server to be `push.zulipchat.com`, and offer a
 [push notification forwarding service](mobile-push-notifications.md) that
 forwards push notifications through our servers to mobile devices.
@@ -85,21 +86,22 @@ and configure this service.
 ### Terms of Service and Privacy policy
 
 Zulip allows you to configure your server's Terms of Service and
-Privacy Policy pages (`/terms` and `/privacy`, respectively).  You can
+Privacy Policy pages (`/terms` and `/privacy`, respectively). You can
 use the `TERMS_OF_SERVICE` and `PRIVACY_POLICY` settings to configure
-the path to your server's policies.  The syntax is Markdown (with
-support for included HTML).  A good approach is to use paths like
+the path to your server's policies. The syntax is Markdown (with
+support for included HTML). A good approach is to use paths like
 `/etc/zulip/terms.md`, so that it's easy to back up your policy
 configuration along with your other Zulip server configuration.
 
 ### Miscellaneous server settings
 
 Some popular settings in `/etc/zulip/settings.py` include:
-* The Twitter integration, which provides pretty inline previews of
+
+- The Twitter integration, which provides pretty inline previews of
   tweets.
-* The [email gateway](../production/email-gateway.md), which lets
+- The [email gateway](../production/email-gateway.md), which lets
   users send emails into Zulip.
-* The [Video call integrations](../production/video-calls.md).
+- The [Video call integrations](../production/video-calls.md).
 
 ## Zulip announcement list
 

docs/production/ssl-certificates.md

@@ -11,13 +11,14 @@ chore (nor expense) that it used to be.
 
 If you already have an SSL certificate, just install (or symlink) its
 files into place at the following paths:
-* `/etc/ssl/private/zulip.key` for the private key
-* `/etc/ssl/certs/zulip.combined-chain.crt` for the certificate.
+
+- `/etc/ssl/private/zulip.key` for the private key
+- `/etc/ssl/certs/zulip.combined-chain.crt` for the certificate.
 
 Your certificate file should contain not only your own certificate but
 its **full chain, including any intermediate certificates** used by
-your certificate authority (CA).  See the [nginx
-documentation][nginx-chains] for details on what this means.  If
+your certificate authority (CA). See the [nginx
+documentation][nginx-chains] for details on what this means. If
 you're missing part of the chain, your server may work with some
 browsers, but not others and not the Zulip mobile and desktop apps.
 The desktop apps support [configuring a custom CA][desktop-certs] to
@@ -32,15 +33,16 @@ browsers ignore errors that others don't.
 
 Two good tests include:
 
-* If your server is accessible from the public Internet, use the [SSL
-  Labs tester][ssllabs-tester].  Be sure to check for "Chain issues";
+- If your server is accessible from the public Internet, use the [SSL
+  Labs tester][ssllabs-tester]. Be sure to check for "Chain issues";
   if any, your certificate file is missing intermediate certificates.
 
-* Alternatively, run a command like `curl -SsI https://zulip.example.com`
+- Alternatively, run a command like `curl -SsI https://zulip.example.com`
   (using your server's URL) from a machine that can reach your server.
-  Make sure that on the same machine, `curl -SsI
-  https://incomplete-chain.badssl.com` gives an error; `curl` on some
-  machines, including Macs, will accept incomplete chains.
+  Make sure that on the same machine,
+  `curl -SsI https://incomplete-chain.badssl.com` gives an error;
+  `curl` on some machines, including Macs, will accept incomplete
+  chains.
 
 [ssllabs-tester]: https://www.ssllabs.com/ssltest/analyze.html
 
@@ -48,17 +50,18 @@ Two good tests include:
 
 [Let's Encrypt](https://letsencrypt.org/) is a free, completely
 automated CA launched in 2016 to help make HTTPS routine for the
-entire Web.  Zulip offers a simple automation for
+entire Web. Zulip offers a simple automation for
 [Certbot](https://certbot.eff.org/), a Let's Encrypt client, to get
 SSL certificates from Let's Encrypt and renew them automatically.
 
-We recommend most Zulip servers use Certbot.  You'll want something
+We recommend most Zulip servers use Certbot. You'll want something
 else if:
-* you have an existing workflow for managing SSL certificates
+
+- you have an existing workflow for managing SSL certificates
   that you prefer;
-* you need wildcard certificates (support from Let's Encrypt released
+- you need wildcard certificates (support from Let's Encrypt released
   in [March 2018][letsencrypt-wildcard]); or
-* your Zulip server is not on the public Internet. (In this case you
+- your Zulip server is not on the public Internet. (In this case you
   can [still use Certbot][certbot-manual-mode], but it's less
   convenient; and you'll want to ignore Zulip's automation.)
 
@@ -71,7 +74,7 @@ To enable the Certbot automation when first installing Zulip, just
 pass the `--certbot` flag when [running the install script][doc-install-script].
 
 The `--hostname` and `--email` options are required when using
-`--certbot`.  You'll need the hostname to be a real DNS name, and the
+`--certbot`. You'll need the hostname to be a real DNS name, and the
 Zulip server machine to be reachable by that name from the public
 Internet.
 
@@ -84,10 +87,12 @@ one as described in the section below after installing Zulip.
 
 To enable the Certbot automation on an already-installed Zulip
 server, run the following commands:
-```
+
+```bash
 sudo -s  # If not already root
 /home/zulip/deployments/current/scripts/setup/setup-certbot --email=EMAIL HOSTNAME [HOSTNAME2...]
 ```
+
 where HOSTNAME is the domain name users see in their browser when
 using the server (e.g., `zulip.example.com`), and EMAIL is a contact
 address for the server admins. Additional hostnames can also be
@@ -99,23 +104,40 @@ When the Certbot automation in Zulip is first enabled, by either
 method, it creates an account for the server at the Let's Encrypt CA;
 requests a certificate for the given hostname; proves to the CA that
 the server controls the website at that hostname; and is then given a
-certificate.  (For details, refer to
+certificate. (For details, refer to
 [Let's Encrypt](https://letsencrypt.org/how-it-works/).)
 
-Then it records a flag in `/etc/zulip/zulip.conf` saying Certbot is in
-use and should be auto-renewed.  A cron job checks that flag, then
-checks if any certificates are due for renewal, and if they are (so
-approximately once every 60 days), repeats the process of request,
-prove, get a fresh certificate.
+### Renewal
 
+Let's Encrypt certificates expire after 90 days. Short expiration
+periods are good for security, but they also mean that it's important
+to automatically renew them to avoid regular maintenance work.
+
+Zulip configures automatic renewal for you. As a result, a Zulip
+server configured with Certbot does not require any ongoing work to
+maintain a current valid SSL certificate.
+
+The `certbot` package configures a systemd timer (similar to a cron
+job) that will renew any Certbot certificates that are due for
+renewal. The renewal process repeats the Certbot proof-of-control
+process, receives the new certificate from Certbot, installs the new
+certificate, and then reloads `nginx`.
+
+#### Troubleshooting
+
+If your Certbot certificate expires, it is usually because of firewall
+rules preventing the Certbot renewal process (which is essentially
+identical to the initial certificate request process) from
+working. You can debug interactively by running the command from the
+cron job, `/usr/bin/certbot renew`, as `root`.
 
 ## Self-signed certificate
 
 If you aren't able to use Certbot, you can generate a self-signed SSL
-certificate.  This can be convenient for testing, but isn't
-recommended for production, as it is insecure.  The Zulip desktop and
+certificate. This can be convenient for testing, but isn't
+recommended for production, as it is insecure. The Zulip desktop and
 mobile apps will not connect to a server if they cannot validate its
-SSL certificate.  The desktop apps support [configuring a custom
+SSL certificate. The desktop apps support [configuring a custom
 certificate authority][desktop-certs] to allow validation of an
 internal certificate.
 
@@ -125,39 +147,40 @@ just pass the `--self-signed-cert` flag when
 
 To generate a self-signed certificate for an already-installed Zulip
 server, run the following commands:
-```
+
+```bash
 sudo -s  # If not already root
 /home/zulip/deployments/current/scripts/setup/generate-self-signed-cert HOSTNAME
 ```
+
 where HOSTNAME is the domain name (or IP address) to use on the
 generated certificate.
 
 After replacing the certificates, you need to reload `nginx` by
 running the following as `root`:
-```
+
+```bash
 service nginx reload
 ```
 
 [desktop-certs]: https://zulip.com/help/custom-certificates
 
-
 ## Troubleshooting
 
 ### The Android app can't connect to the server
 
-This is most often caused by an incomplete certificate chain.  See
+This is most often caused by an incomplete certificate chain. See
 discussion in the [Manual install](#manual-install) section above.
 
-
 ### The iOS app can't connect to the server
 
 This can be caused by a server set up to support only TLS 1.1 or
 older (including TLS 1.0, SSL 3, or SSL 2.)
 
 TLS 1.2 has been a standard for over 10 years, and all modern web
-server software supports it.  Starting in early 2020, all major
-browsers [will *require* TLS 1.2 or later][tls12-required-news], and
-will refuse to connect over TLS 1.1 or older.  And on iOS, Apple [has
+server software supports it. Starting in early 2020, all major
+browsers [will _require_ TLS 1.2 or later][tls12-required-news], and
+will refuse to connect over TLS 1.1 or older. And on iOS, Apple [has
 since iOS 9][apple-ats] required TLS 1.2 for all connections made by
 apps, unless the app specifically opts into lower security.
 
@@ -169,12 +192,11 @@ to check what TLS versions it supports is the [SSL Labs
 tester][ssllabs-tester].
 
 To resolve this issue, update your server to support TLS 1.2,
-and preferably also TLS 1.3.  For nginx, see [the `ssl_protocols`
+and preferably also TLS 1.3. For nginx, see [the `ssl_protocols`
 directive][nginx-doc-protocols] in your configuration.
 
 [nginx-doc-protocols]: https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_protocols
 
-
 ### The Android app connects to the server on some devices but not others
 
 An issue on Android 7.0 ([report][android7.0-tls-issue],
@@ -187,14 +209,14 @@ configuration.
 
 The issue is that Android 7.0 supports only the curve `secp256r1` when
 doing elliptic-curve cryptography for TLS, and not other curves like
-`secp384r1` or `secp512r1`.  If your server's TLS/SSL configuration
+`secp384r1` or `secp512r1`. If your server's TLS/SSL configuration
 offers only other curves, then Android 7.0 clients will be unable to
 connect.
 
 By default `nginx` (and therefore a Zulip server) offers the
-`secp256r1` curve among others, and so everything works.  You can
+`secp256r1` curve among others, and so everything works. You can
 control the offered curves with `ssl_ecdh_curve` in the `nginx`
-configuration on your server.  See [nginx docs][nginx-doc-curve] for
+configuration on your server. See [nginx docs][nginx-doc-curve] for
 details.
 
 [nginx-doc-curve]: https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_ecdh_curve
@@ -202,13 +224,13 @@ details.
 Two signs for diagnosing this issue in contrast to some other root
 cause:
 
-* This issue affects only Android 7.0; it's fixed in Android 7.1.1 and
+- This issue affects only Android 7.0; it's fixed in Android 7.1.1 and
   later.
 
-* If your server is reachable from the public Internet, use the [SSL
-  Labs tester][ssllabs-tester].  Under "Cipher Suites" you may see
+- If your server is reachable from the public Internet, use the [SSL
+  Labs tester][ssllabs-tester]. Under "Cipher Suites" you may see
   lines beginning with `TLS_ECDHE`, for cipher suites which use
-  elliptic-curve cryptography.  These lines will have further text
+  elliptic-curve cryptography. These lines will have further text
   like `ECDH secp256r1` or `ECDH secp384r1`, which identifies specific
-  elliptic curves your server offers to use.  This issue applies if
+  elliptic curves your server offers to use. This issue applies if
   your server does not offer `secp256r1`.

docs/production/troubleshooting.md

@@ -11,7 +11,7 @@ overview](../overview/architecture-overview.md), particularly the
 understand the many services Zulip uses.
 
 If you encounter issues while running Zulip, take a look at Zulip's logs, which
-are located in  `/var/log/zulip/`. That directory contains one log file for
+are located in `/var/log/zulip/`. That directory contains one log file for
 each service, plus `errors.log` (has all errors), `server.log` (has logs from
 the Django and Tornado servers), and `workers.log` (has combined logs from the
 queue workers).
@@ -21,7 +21,7 @@ on this page includes details about how to fix common issues with Zulip services
 
 If you run into additional problems, [please report
 them](https://github.com/zulip/zulip/issues) so that we can update
-this page!  The Zulip installation scripts logs its full output to
+this page! The Zulip installation scripts logs its full output to
 `/var/log/zulip/install.log`, so please include the context for any
 tracebacks from that log.
 
@@ -37,13 +37,14 @@ and restart various services.
 ### Checking status with `supervisorctl status`
 
 You can check if the Zulip application is running using:
-```
+
+```bash
 supervisorctl status
 ```
 
 When everything is running as expected, you will see something like this:
 
-```
+```console
 process-fts-updates                                             RUNNING   pid 2194, uptime 1:13:11
 zulip-django                                                    RUNNING   pid 2192, uptime 1:13:11
 zulip-tornado                                                   RUNNING   pid 2193, uptime 1:13:11
@@ -63,10 +64,10 @@ zulip-workers:zulip-events-user-presence                        RUNNING   pid 21
 If you see any services showing a status other than `RUNNING`, or you
 see an uptime under 5 seconds (which indicates it's crashing
 immediately after startup and repeatedly restarting), that service
-isn't running.  If you don't see relevant logs in
+isn't running. If you don't see relevant logs in
 `/var/log/zulip/errors.log`, check the log file declared via
 `stdout_logfile` for that service's entry in
-`/etc/supervisor/conf.d/zulip.conf` for details.  Logs only make it to
+`/etc/supervisor/conf.d/zulip.conf` for details. Logs only make it to
 `/var/log/zulip/errors.log` once a service has started fully.
 
 ### Restarting services with `supervisorctl restart all`
@@ -75,7 +76,7 @@ After you change configuration in `/etc/zulip/settings.py` or fix a
 misconfiguration, you will often want to restart the Zulip application.
 You can restart Zulip using:
 
-```
+```bash
 supervisorctl restart all
 ```
 
@@ -83,7 +84,7 @@ supervisorctl restart all
 
 Similarly, you can stop Zulip using:
 
-```
+```bash
 supervisorctl stop all
 ```
 
@@ -96,39 +97,42 @@ The Zulip application uses several major open source services to store
 and cache data, queue messages, and otherwise support the Zulip
 application:
 
-* PostgreSQL
-* RabbitMQ
-* Nginx
-* Redis
-* memcached
+- PostgreSQL
+- RabbitMQ
+- Nginx
+- Redis
+- memcached
 
 If one of these services is not installed or functioning correctly,
-Zulip will not work.  Below we detail some common configuration
+Zulip will not work. Below we detail some common configuration
 problems and how to resolve them:
 
-* If your browser reports no webserver is running, that is likely
+- If your browser reports no webserver is running, that is likely
   because nginx is not configured properly and thus failed to start.
   nginx will fail to start if you configured SSL incorrectly or did
-  not provide SSL certificates.  To fix this, configure them properly
+  not provide SSL certificates. To fix this, configure them properly
   and then run:
-  ```
+
+  ```bash
   service nginx restart
   ```
 
-* If your host is being port scanned by unauthorized users, you may see
+- If your host is being port scanned by unauthorized users, you may see
   messages in `/var/log/zulip/server.log` like
-  ```
+
+  ```text
   2017-02-22 14:11:33,537 ERROR Invalid HTTP_HOST header: '10.2.3.4'. You may need to add u'10.2.3.4' to ALLOWED_HOSTS.
   ```
+
   Django uses the hostnames configured in `ALLOWED_HOSTS` to identify
   legitimate requests and block others. When an incoming request does
   not have the correct HTTP Host header, Django rejects it and logs the
   attempt. For more on this issue, see the [Django release notes on Host header
   poisoning](https://www.djangoproject.com/weblog/2013/feb/19/security/#s-issue-host-header-poisoning)
 
-* An AMQPConnectionError traceback or error running rabbitmqctl
+- An AMQPConnectionError traceback or error running rabbitmqctl
   usually means that RabbitMQ is not running; to fix this, try:
-  ```
+  ```bash
   service rabbitmq-server restart
   ```
   If RabbitMQ fails to start, the problem is often that you are using
@@ -137,16 +141,14 @@ problems and how to resolve them:
 
 ### Restrict unattended upgrades
 
-```eval_rst
-.. important::
-    We recommend that you `disable or limit Ubuntu's unattended-upgrades
-    to skip some server packages
-    <https://linoxide.com/ubuntu-how-to/enable-disable-unattended-upgrades-ubuntu-16-04/>`;
-    if you disable them, do not forget to regularly install apt upgrades
-    manually.  With unattended upgrades enabled but not limited, the
-    moment a new PostgreSQL release is published, your Zulip server will
-    have its PostgreSQL server upgraded (and thus restarted).
-```
+:::{important}
+We recommend that you disable or limit Ubuntu's unattended-upgrades
+to skip some server packages. With unattended upgrades enabled but
+not limited, the moment a new PostgreSQL release is published, your
+Zulip server will have its PostgreSQL server upgraded (and thus
+restarted). If you do disable unattended-upgrades, do not forget to
+regularly install apt upgrades manually!
+:::
 
 Restarting one of the system services that Zulip uses (PostgreSQL,
 memcached, Redis, or Rabbitmq) will drop the connections that
@@ -155,7 +157,7 @@ those connections throwing errors.
 
 Zulip is designed to recover from system service downtime by creating
 new connections once the system service is back up, so the Zulip
-outage will end once the system service finishes restarting.  But
+outage will end once the system service finishes restarting. But
 you'll get a bunch of error emails during the system service outage
 whenever one of the Zulip server's ~20 workers attempts to access the
 system service.
@@ -177,7 +179,7 @@ You can ensure that the `unattended-upgrades` package never upgrades
 PostgreSQL, memcached, Redis, or RabbitMQ, by configuring in
 `/etc/apt/apt.conf.d/50unattended-upgrades`:
 
-```
+```text
 // Python regular expressions, matching packages to exclude from upgrading
 Unattended-Upgrade::Package-Blacklist {
     "libc\d+";
@@ -192,30 +194,30 @@ Unattended-Upgrade::Package-Blacklist {
 
 ## Monitoring
 
-Chat is mission-critical to many organizations.  This section contains
+Chat is mission-critical to many organizations. This section contains
 advice on monitoring your Zulip server to minimize downtime.
 
 First, we should highlight that Zulip sends Django error emails to
-`ZULIP_ADMINISTRATOR` for any backend exceptions.  A properly
+`ZULIP_ADMINISTRATOR` for any backend exceptions. A properly
 functioning Zulip server shouldn't send any such emails, so it's worth
 reporting/investigating any that you do see.
 
 Beyond that, the most important monitoring for a Zulip server is
 standard stuff:
 
-* Basic host health monitoring for issues running out of disk space,
+- Basic host health monitoring for issues running out of disk space,
   especially for the database and where uploads are stored.
-* Service uptime and standard monitoring for the [services Zulip
-  depends on](#troubleshooting-services).  Most monitoring software
+- Service uptime and standard monitoring for the [services Zulip
+  depends on](#troubleshooting-services). Most monitoring software
   has standard plugins for Nginx, PostgreSQL, Redis, RabbitMQ,
   and memcached, and those will work well with Zulip.
-* `supervisorctl status` showing all services `RUNNING`.
-* Checking for processes being OOM killed.
+- `supervisorctl status` showing all services `RUNNING`.
+- Checking for processes being OOM killed.
 
 Beyond that, Zulip ships a few application-specific end-to-end health
-checks.  The Nagios plugins `check_send_receive_time`,
+checks. The Nagios plugins `check_send_receive_time`,
 `check_rabbitmq_queues`, and `check_rabbitmq_consumers` are generally
-sufficient to point to the cause of any Zulip production issue.  See
+sufficient to point to the cause of any Zulip production issue. See
 the next section for details.
 
 ### Nagios configuration
@@ -227,36 +229,36 @@ tarballs).
 
 The Nagios plugins used by that configuration are installed
 automatically by the Zulip installation process in subdirectories
-under `/usr/lib/nagios/plugins/`.  The following is a summary of the
+under `/usr/lib/nagios/plugins/`. The following is a summary of the
 useful Nagios plugins included with Zulip and what they check:
 
 Application server and queue worker monitoring:
 
-* `check_send_receive_time`: Sends a test message through the system
+- `check_send_receive_time`: Sends a test message through the system
   between two bot users to check that end-to-end message sending
-  works.  An effective end-to-end check for Zulip's Django and Tornado
+  works. An effective end-to-end check for Zulip's Django and Tornado
   systems being healthy.
-* `check_rabbitmq_consumers` and `check_rabbitmq_queues`: Effective
+- `check_rabbitmq_consumers` and `check_rabbitmq_queues`: Effective
   checks for Zulip's RabbitMQ-based queuing systems being healthy.
-* `check_worker_memory`: Monitors for memory leaks in queue workers.
-* `check_email_deliverer_backlog` and `check_email_deliverer_process`:
+- `check_worker_memory`: Monitors for memory leaks in queue workers.
+- `check_email_deliverer_backlog` and `check_email_deliverer_process`:
   Monitors for whether scheduled outgoing emails (e.g. invitation
   reminders) are being sent properly.
 
 Database monitoring:
 
-* `check_fts_update_log`: Checks whether full-text search updates are
+- `check_fts_update_log`: Checks whether full-text search updates are
   being processed properly or getting backlogged.
-* `check_postgres`: General checks for database health.
-* `check_postgresql_backup`: Checks status of PostgreSQL backups.
-* `check_postgresql_replication_lag`: Checks whether PostgreSQL streaming
+- `check_postgres`: General checks for database health.
+- `check_postgresql_backup`: Checks status of PostgreSQL backups.
+- `check_postgresql_replication_lag`: Checks whether PostgreSQL streaming
   replication is up to date.
 
 Standard server monitoring:
 
-* `check_website_response.sh`: Basic HTTP check.
-* `check_debian_packages`: Checks whether the system is behind on `apt
-  upgrade`.
+- `check_website_response.sh`: Basic HTTP check.
+- `check_debian_packages`: Checks whether the system is behind on
+  `apt upgrade`.
 
 If you're using these plugins, bug reports and pull requests to make
 it easier to monitor Zulip and maintain it in production are
@@ -266,5 +268,5 @@ encouraged!
 
 As a measure to mitigate the potential impact of any future memory
 leak bugs in one of the Zulip daemons, Zulip service automatically
-restarts itself every Sunday early morning.  See
+restarts itself every Sunday early morning. See
 `/etc/cron.d/restart-zulip` for the precise configuration.

docs/production/upgrade-or-modify.md

@@ -10,53 +10,55 @@ This page explains how to upgrade, patch, or modify Zulip, including:
 - [Upgrading the operating system](#upgrading-the-operating-system)
 - [Upgrading PostgreSQL](#upgrading-postgresql)
 - [Modifying Zulip](#modifying-zulip)
-- [Applying changes from master](#applying-changes-from-master)
+- [Applying changes from `main`](#applying-changes-from-main)
 
 ## Upgrading to a release
 
 Note that there are additional instructions if you're [using
 docker-zulip][docker-upgrade], have [patched Zulip](#modifying-zulip),
 or have [modified Zulip-managed configuration
-files](#preserving-local-changes-to-service-configuration-files).  To upgrade
+files](#preserving-local-changes-to-service-configuration-files). To upgrade
 to a new Zulip release:
 
 1. Read the [upgrade notes](../overview/changelog.html#upgrade-notes)
    for all releases newer than what is currently installed.
 
 1. Download the appropriate release tarball from
-    <https://www.zulip.org/dist/releases/> You can download the latest
-    release with:
+   <https://download.zulip.com/server/>. You can get the latest
+   release (**Zulip Server {{ LATEST_RELEASE_VERSION }}**) with the
+   following command:
 
-    ```
-    wget https://www.zulip.org/dist/releases/zulip-server-latest.tar.gz
-    ```
+   ```bash
+   wget https://download.zulip.com/server/zulip-server-latest.tar.gz
+   ```
 
-    You also have the option of upgrading Zulip [to a version in a Git
-    repository directly](#upgrading-from-a-git-repository) or creating
-    your own release tarballs from a copy of the [zulip.git
-    repository](https://github.com/zulip/zulip) using
-    `tools/build-release-tarball`.
+   You also have the option of upgrading Zulip [to a version in a Git
+   repository directly](#upgrading-from-a-git-repository) or creating
+   your own release tarballs from a copy of the [zulip.git
+   repository](https://github.com/zulip/zulip) using
+   `tools/build-release-tarball`.
 
 1. Log in to your Zulip and run as root:
 
-    ```
-    /home/zulip/deployments/current/scripts/upgrade-zulip zulip-server-VERSION.tar.gz
-    ```
+   ```bash
+   /home/zulip/deployments/current/scripts/upgrade-zulip zulip-server-latest.tar.gz
+   ```
 
-    The upgrade process will:
-    * Run `apt-get upgrade`
-    * Install new versions of Zulip's dependencies (mainly Python packages).
-    * (`upgrade-zulip-from-git` only) Build Zulip's frontend assets using `webpack`.
-    * Shut down the Zulip service
-    * Run a `puppet apply`
-    * Run any database migrations
-    * Bring the Zulip service back up on the new version.
+   The upgrade process will:
+
+   - Run `apt-get upgrade`
+   - Install new versions of Zulip's dependencies (mainly Python packages).
+   - (`upgrade-zulip-from-git` only) Build Zulip's frontend assets using `webpack`.
+   - Shut down the Zulip service
+   - Run a `puppet apply`
+   - Run any database migrations
+   - Bring the Zulip service back up on the new version.
 
 Upgrading will result in brief downtime for the service, which should
 be under 30 seconds unless there is an expensive database migration
 involved (these will be documented in the [release
 notes](../overview/changelog.md), and usually can be avoided with
-some care).  If downtime is problematic for your organization,
+some care). If downtime is problematic for your organization,
 consider testing the upgrade on a
 [backup](../production/export-and-import.html#backups) in advance,
 doing the final upgrade at off hours, or buying a support contract.
@@ -68,15 +70,15 @@ run into any issues or need to roll back the upgrade.
 
 Zulip supports upgrading a production installation to any commit in a
 Git repository, which is great for [running pre-release changes from
-master](#applying-changes-from-master) or [maintaining a
-fork](#making-changes).  The process is simple:
+`main`](#applying-changes-from-main) or [maintaining a
+fork](#making-changes). The process is simple:
 
-```
+```bash
 # Upgrade to an official release
 /home/zulip/deployments/current/scripts/upgrade-zulip-from-git 1.8.1
 # Upgrade to a branch (or other Git ref)
 /home/zulip/deployments/current/scripts/upgrade-zulip-from-git 2.1.x
-/home/zulip/deployments/current/scripts/upgrade-zulip-from-git master
+/home/zulip/deployments/current/scripts/upgrade-zulip-from-git main
 ```
 
 Zulip will automatically fetch the relevant Git commit and upgrade to
@@ -87,15 +89,15 @@ containing the changes planned for the next minor release
 (E.g. 2.1.5); we support these stable release branches as though they
 were a published release.
 
-The `master` branch contains changes planned for the next major
+The `main` branch contains changes planned for the next major
 release (E.g. 3.0); see our documentation on [running
-master](#upgrading-to-master) before upgrading to it.
+`main`](#upgrading-to-main) before upgrading to it.
 
 By default, this uses the main upstream Zulip server repository, but
 you can configure any other Git repository by adding a section like
 this to `/etc/zulip/zulip.conf`:
 
-```
+```ini
 [deployment]
 git_repo_url = https://github.com/zulip/zulip.git
 ```
@@ -123,7 +125,7 @@ suggest using that updated template to update
    do not have a recent [complete backup][backups]), and make a copy
    of the current template:
 
-   ```
+   ```bash
    cp -a /etc/zulip/settings.py ~/zulip-settings-backup.py
    cp -a /home/zulip/deployments/current/zproject/prod_settings_template.py /etc/zulip/settings-new.py
    ```
@@ -137,7 +139,7 @@ suggest using that updated template to update
    the template that your `/etc/zulip/settings.py` was installed
    using, and the differences that your file has from that:
 
-   ```
+   ```bash
    /home/zulip/deployments/current/scripts/setup/compare-settings-to-template
    ```
 
@@ -149,7 +151,7 @@ suggest using that updated template to update
    the server to pick up the new file; this should be a no-op, but it
    is much better to discover immediately if it is not:
 
-   ```
+   ```bash
    cp -a /etc/zulip/settings-new.py /etc/zulip/settings.py
    su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
    ```
@@ -163,22 +165,23 @@ See also the general Zulip server [troubleshooting
 guide](../production/troubleshooting.md).
 
 The upgrade scripts are idempotent, so there's no harm in trying again
-after resolving an issue.  The most common causes of errors are:
+after resolving an issue. The most common causes of errors are:
 
-* Networking issues (e.g. your Zulip server doesn't have reliable
-  Internet access or needs a proxy set up).  Fix the networking issue
+- Networking issues (e.g. your Zulip server doesn't have reliable
+  Internet access or needs a proxy set up). Fix the networking issue
   and try again.
-* Especially when using `upgrade-zulip-from-git`, systems with the
+- Especially when using `upgrade-zulip-from-git`, systems with the
   minimal RAM for running Zulip can run into out-of-memory issues
   during the upgrade process (generally `tools/webpack` is the step
-  that fails).  You can get past this by shutting down the Zulip
+  that fails). You can get past this by shutting down the Zulip
   server with `supervisorctl stop all` to free up RAM before running
   the upgrade process.
 
 Useful logs are available in a few places:
-* The Zulip upgrade scripts log all output to
+
+- The Zulip upgrade scripts log all output to
   `/var/log/zulip/upgrade.log`.
-* The Zulip server logs all Internal Server Errors to
+- The Zulip server logs all Internal Server Errors to
   `/var/log/zulip/errors.log`.
 
 If you need help and don't have a support contract, you can visit
@@ -206,18 +209,17 @@ This means that if the new version isn't working,
 you can quickly downgrade to the old version by running
 `/home/zulip/deployments/last/scripts/restart-server`, or to an
 earlier previous version by running
-`/home/zulip/deployments/DATE/scripts/restart-server`.  The
+`/home/zulip/deployments/DATE/scripts/restart-server`. The
 `restart-server` script stops any running Zulip server, and starts
 the version corresponding to the `restart-server` path you call.
 
 ## Preserving local changes to service configuration files
 
-```eval_rst
-.. warning::
-    If you have modified service configuration files installed by
-    Zulip (e.g. the nginx configuration), the Zulip upgrade process will
-    overwrite your configuration when it does the ``puppet apply``.
-```
+:::{warning}
+If you have modified service configuration files installed by
+Zulip (e.g. the nginx configuration), the Zulip upgrade process will
+overwrite your configuration when it does the `puppet apply`.
+:::
 
 You can test whether this will happen assuming no upstream changes to
 the configuration using `scripts/zulip-puppet-apply` (without the
@@ -228,9 +230,9 @@ configuration.
 
 That said, Zulip's configuration files are designed to be flexible
 enough for a wide range of installations, from a small self-hosted
-system to Zulip Cloud.  Before making local changes to a configuration
+system to Zulip Cloud. Before making local changes to a configuration
 file, first check whether there's an option supported by
-`/etc/zulip/zulip.conf` for the customization you need.  And if you
+`/etc/zulip/zulip.conf` for the customization you need. And if you
 need to make local modifications, please report the issue so that we
 can make the Zulip Puppet configuration flexible enough to handle your
 setup.
@@ -261,48 +263,57 @@ instructions for other supported platforms.
 2. As the Zulip user, stop the Zulip server and run the following
    to back up the system:
 
-    ```
-    supervisorctl stop all
-    /home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
-    ```
+   ```bash
+   supervisorctl stop all
+   /home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
+   ```
 
 3. Switch to the root user and upgrade the operating system using the
-   OS's standard tooling.  E.g. for Ubuntu, this means running
+   OS's standard tooling. E.g. for Ubuntu, this means running
    `do-release-upgrade` and following the prompts until it completes
    successfully:
 
-    ```
-    sudo -i # Or otherwise get a root shell
-    do-release-upgrade -d
-    ```
+   ```bash
+   sudo -i # Or otherwise get a root shell
+   do-release-upgrade -d
+   ```
 
-    The `-d` option to `do-release-upgrade` is required because Ubuntu
-    20.04 is new; it will stop being necessary once the first point
-    release update of Ubuntu 20.04 LTS is released.
+   The `-d` option to `do-release-upgrade` is required because Ubuntu
+   20.04 is new; it will stop being necessary once the first point
+   release update of Ubuntu 20.04 LTS is released.
 
-    When `do-release-upgrade` asks you how to upgrade configuration
-    files for services that Zulip manages like Redis, PostgreSQL,
-    Nginx, and memcached, the best choice is `N` to keep the
-    currently installed version.  But it's not important; the next
-    step will re-install Zulip's configuration in any case.
+   When `do-release-upgrade` asks you how to upgrade configuration
+   files for services that Zulip manages like Redis, PostgreSQL,
+   Nginx, and memcached, the best choice is `N` to keep the
+   currently installed version. But it's not important; the next
+   step will re-install Zulip's configuration in any case.
 
 4. As root, upgrade the database to the latest version of PostgreSQL:
 
-    ```
-    /home/zulip/deployments/current/scripts/setup/upgrade-postgresql
-    ```
+   ```bash
+   /home/zulip/deployments/current/scripts/setup/upgrade-postgresql
+   ```
 
-5. Finally, we need to reinstall the current version of Zulip, which
+5. Ubuntu 20.04 has a different version of the low-level glibc
+   library, which affects how PostgreSQL orders text data (known as
+   "collations"); this corrupts database indexes that rely on
+   collations. Regenerate the affected indexes by running:
+
+   ```bash
+   /home/zulip/deployments/current/scripts/setup/reindex-textual-data --force
+   ```
+
+6. Finally, we need to reinstall the current version of Zulip, which
    among other things will recompile Zulip's Python module
    dependencies for your new version of Python and rewrite Zulip's
    full-text search indexes to work with the upgraded dictionary
    packages:
 
-    ```
-    rm -rf /srv/zulip-venv-cache/*
-    /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
-        /home/zulip/deployments/current/ --ignore-static-assets --audit-fts-indexes
-    ```
+   ```bash
+   rm -rf /srv/zulip-venv-cache/*
+   /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
+       /home/zulip/deployments/current/ --ignore-static-assets --audit-fts-indexes
+   ```
 
    This will finish by restarting your Zulip server; you should now be
    able to navigate to its URL and confirm everything is working
@@ -310,7 +321,7 @@ instructions for other supported platforms.
 
 ### Upgrading from Ubuntu 16.04 Xenial to 18.04 Bionic
 
-1. Upgrade your server to the latest Zulip `2.1.x` release.  You can
+1. Upgrade your server to the latest Zulip `2.1.x` release. You can
    only upgrade to Zulip 3.0 and newer after completing this process,
    since newer releases don't support Ubuntu 16.04 Xenial.
 
@@ -321,27 +332,27 @@ instructions for other supported platforms.
 4. As root, upgrade the database installation and OS configuration to
    match the new OS version:
 
-    ```
-    touch /usr/share/postgresql/10/pgroonga_setup.sql.applied
-    /home/zulip/deployments/current/scripts/zulip-puppet-apply -f
-    pg_dropcluster 10 main --stop
-    systemctl stop postgresql
-    pg_upgradecluster 9.5 main
-    pg_dropcluster 9.5 main
-    apt remove postgresql-9.5
-    systemctl start postgresql
-    systemctl restart memcached
-    ```
+   ```bash
+   touch /usr/share/postgresql/10/pgroonga_setup.sql.applied
+   /home/zulip/deployments/current/scripts/zulip-puppet-apply -f
+   pg_dropcluster 10 main --stop
+   systemctl stop postgresql
+   pg_upgradecluster 9.5 main
+   pg_dropcluster 9.5 main
+   apt remove postgresql-9.5
+   systemctl start postgresql
+   systemctl restart memcached
+   ```
 
 5. Finally, we need to reinstall the current version of Zulip, which
    among other things will recompile Zulip's Python module
    dependencies for your new version of Python:
 
-    ```
-    rm -rf /srv/zulip-venv-cache/*
-    /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
-        /home/zulip/deployments/current/ --ignore-static-assets
-    ```
+   ```bash
+   rm -rf /srv/zulip-venv-cache/*
+   /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
+       /home/zulip/deployments/current/ --ignore-static-assets
+   ```
 
    This will finish by restarting your Zulip server; you should now
    be able to navigate to its URL and confirm everything is working
@@ -352,13 +363,13 @@ instructions for other supported platforms.
 
 7. As root, finish by verifying the contents of the full-text indexes:
 
-    ```
-    /home/zulip/deployments/current/manage.py audit_fts_indexes
-    ```
+   ```bash
+   /home/zulip/deployments/current/manage.py audit_fts_indexes
+   ```
 
 ### Upgrading from Ubuntu 14.04 Trusty to 16.04 Xenial
 
-1. Upgrade your server to the latest Zulip `2.0.x` release.  You can
+1. Upgrade your server to the latest Zulip `2.0.x` release. You can
    only upgrade to Zulip `2.1.x` and newer after completing this
    process, since newer releases don't support Ubuntu 14.04 Trusty.
 
@@ -369,27 +380,27 @@ instructions for other supported platforms.
 4. As root, upgrade the database installation and OS configuration to
    match the new OS version:
 
-    ```
-    apt remove upstart -y
-    /home/zulip/deployments/current/scripts/zulip-puppet-apply -f
-    pg_dropcluster 9.5 main --stop
-    systemctl stop postgresql
-    pg_upgradecluster -m upgrade 9.3 main
-    pg_dropcluster 9.3 main
-    apt remove postgresql-9.3
-    systemctl start postgresql
-    service memcached restart
-    ```
+   ```bash
+   apt remove upstart -y
+   /home/zulip/deployments/current/scripts/zulip-puppet-apply -f
+   pg_dropcluster 9.5 main --stop
+   systemctl stop postgresql
+   pg_upgradecluster -m upgrade 9.3 main
+   pg_dropcluster 9.3 main
+   apt remove postgresql-9.3
+   systemctl start postgresql
+   service memcached restart
+   ```
 
 5. Finally, we need to reinstall the current version of Zulip, which
    among other things will recompile Zulip's Python module
    dependencies for your new version of Python:
 
-    ```
-    rm -rf /srv/zulip-venv-cache/*
-    /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
-        /home/zulip/deployments/current/ --ignore-static-assets
-    ```
+   ```bash
+   rm -rf /srv/zulip-venv-cache/*
+   /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
+       /home/zulip/deployments/current/ --ignore-static-assets
+   ```
 
    This will finish by restarting your Zulip server; you should now be
    able to navigate to its URL and confirm everything is working
@@ -399,13 +410,80 @@ instructions for other supported platforms.
    Bionic](#upgrading-from-ubuntu-16-04-xenial-to-18-04-bionic), so
    that you are running a supported operating system.
 
+### Upgrading from Debian Buster to Debian Bullseye
+
+1. Upgrade your server to the latest Zulip `4.x` release.
+
+2. As the Zulip user, stop the Zulip server and run the following
+   to back up the system:
+
+   ```bash
+   supervisorctl stop all
+   /home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
+   ```
+
+3. Follow [Debian's instructions to upgrade the OS][bullseye-upgrade].
+
+   [bullseye-upgrade]: https://www.debian.org/releases/bullseye/amd64/release-notes/ch-upgrading.html
+
+   When prompted for you how to upgrade configuration
+   files for services that Zulip manages like Redis, PostgreSQL,
+   Nginx, and memcached, the best choice is `N` to keep the
+   currently installed version. But it's not important; the next
+   step will re-install Zulip's configuration in any case.
+
+4. As root, run the following steps to regenerate configurations
+   for services used by Zulip:
+
+   ```bash
+   apt remove upstart -y
+   /home/zulip/deployments/current/scripts/zulip-puppet-apply -f
+   ```
+
+5. Reinstall the current version of Zulip, which among other things
+   will recompile Zulip's Python module dependencies for your new
+   version of Python:
+
+   ```bash
+   rm -rf /srv/zulip-venv-cache/*
+   /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
+       /home/zulip/deployments/current/ --ignore-static-assets
+   ```
+
+   This will finish by restarting your Zulip server; you should now
+   be able to navigate to its URL and confirm everything is working
+   correctly.
+
+6. Debian Bullseye has a different version of the low-level glibc
+   library, which affects how PostgreSQL orders text data (known as
+   "collations"); this corrupts database indexes that rely on
+   collations. Regenerate the affected indexes by running:
+
+   ```bash
+   /home/zulip/deployments/current/scripts/setup/reindex-textual-data --force
+   ```
+
+7. As root, finish by verifying the contents of the full-text indexes:
+
+   ```bash
+   /home/zulip/deployments/current/manage.py audit_fts_indexes
+   ```
+
+8. As an additional step, you can also [upgrade the postgresql version](#upgrading-postgresql).
+
 ### Upgrading from Debian Stretch to Debian Buster
 
-1. Upgrade your server to the latest Zulip `2.1.x` release.  You can
+1. Upgrade your server to the latest Zulip `2.1.x` release. You can
    only upgrade to Zulip 3.0 and newer after completing this process,
    since newer releases don't support Ubuntu Debian Stretch.
 
-2. Same as for Bionic to Focal.
+2. As the Zulip user, stop the Zulip server and run the following
+   to back up the system:
+
+   ```bash
+   supervisorctl stop all
+   /home/zulip/deployments/current/manage.py backup --output=/home/zulip/release-upgrade.backup.tar.gz
+   ```
 
 3. Follow [Debian's instructions to upgrade the OS][debian-upgrade-os].
 
@@ -414,33 +492,33 @@ instructions for other supported platforms.
    When prompted for you how to upgrade configuration
    files for services that Zulip manages like Redis, PostgreSQL,
    Nginx, and memcached, the best choice is `N` to keep the
-   currently installed version.  But it's not important; the next
+   currently installed version. But it's not important; the next
    step will re-install Zulip's configuration in any case.
 
 4. As root, upgrade the database installation and OS configuration to
    match the new OS version:
 
-    ```
-    apt remove upstart -y
-    /home/zulip/deployments/current/scripts/zulip-puppet-apply -f
-    pg_dropcluster 11 main --stop
-    systemctl stop postgresql
-    pg_upgradecluster -m upgrade 9.6 main
-    pg_dropcluster 9.6 main
-    apt remove postgresql-9.6
-    systemctl start postgresql
-    service memcached restart
-    ```
+   ```bash
+   apt remove upstart -y
+   /home/zulip/deployments/current/scripts/zulip-puppet-apply -f
+   pg_dropcluster 11 main --stop
+   systemctl stop postgresql
+   pg_upgradecluster -m upgrade 9.6 main
+   pg_dropcluster 9.6 main
+   apt remove postgresql-9.6
+   systemctl start postgresql
+   service memcached restart
+   ```
 
 5. Finally, we need to reinstall the current version of Zulip, which
    among other things will recompile Zulip's Python module
    dependencies for your new version of Python:
 
-    ```
-    rm -rf /srv/zulip-venv-cache/*
-    /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
-        /home/zulip/deployments/current/ --ignore-static-assets
-    ```
+   ```bash
+   rm -rf /srv/zulip-venv-cache/*
+   /home/zulip/deployments/current/scripts/lib/upgrade-zulip-stage-2 \
+       /home/zulip/deployments/current/ --ignore-static-assets
+   ```
 
    This will finish by restarting your Zulip server; you should now
    be able to navigate to its URL and confirm everything is working
@@ -449,16 +527,25 @@ instructions for other supported platforms.
 6. [Upgrade to the latest Zulip release](#upgrading-to-a-release), now
    that your server is running a supported operating system.
 
-7. As root, finish by verifying the contents of the full-text indexes:
+7. Debian Buster has a different version of the low-level glibc
+   library, which affects how PostgreSQL orders text data (known as
+   "collations"); this corrupts database indexes that rely on
+   collations. Regenerate the affected indexes by running:
 
-    ```
-    /home/zulip/deployments/current/manage.py audit_fts_indexes
-    ```
+   ```bash
+   /home/zulip/deployments/current/scripts/setup/reindex-textual-data --force
+   ```
+
+8. As root, finish by verifying the contents of the full-text indexes:
+
+   ```bash
+   /home/zulip/deployments/current/manage.py audit_fts_indexes
+   ```
 
 ## Upgrading PostgreSQL
 
 Starting with Zulip 3.0, we use the latest available version of
-PostgreSQL at installation time (currently version 13).  Upgrades to
+PostgreSQL at installation time (currently version 13). Upgrades to
 the version of PostgreSQL are no longer linked to upgrades of the
 distribution; that is, you may opt to upgrade to PostgreSQL 13 while
 running Ubuntu 18.04 Bionic.
@@ -467,88 +554,99 @@ To upgrade the version of PostgreSQL on the Zulip server:
 
 1. Upgrade your server to the latest Zulip release (at least 3.0).
 
-2. Stop the server and take a backup:
+1. Stop the server, as the `zulip` user:
 
-    ```
-    supervisorctl stop all
-    /home/zulip/deployments/current/manage.py backup --output=/home/zulip/postgresql-upgrade.backup.tar.gz
-    ```
+   ```bash
+   # On Zulip before 4.0, use `supervisor stop all` instead
+   /home/zulip/deployments/current/scripts/stop-server
+   ```
 
-3. As root, run the database upgrade tool:
+1. Take a backup, in case of any problems:
 
-    ```
-    /home/zulip/deployments/current/scripts/setup/upgrade-postgresql
-    ```
+   ```bash
+   /home/zulip/deployments/current/manage.py backup --output=/home/zulip/postgresql-upgrade.backup.tar.gz
+   ```
 
-`upgrade-postgresql` will have finished by restarting your Zulip server;
-you should now be able to navigate to its URL and confirm everything
-is working correctly.
+1. As root, run the database upgrade tool:
 
+   ```bash
+   /home/zulip/deployments/current/scripts/setup/upgrade-postgresql
+   ```
+
+1. As the `zulip` user, start the server again:
+
+   ```bash
+   # On Zulip before 4.0, use `restart-server` instead of `start-server` instead
+   /home/zulip/deployments/current/scripts/start-server
+   ```
+
+You should now be able to navigate to the Zulip server's URL and
+confirm everything is working correctly.
 
 ## Modifying Zulip
 
 Zulip is 100% free and open source software, and you're welcome to
-modify it!  This section explains how to make and maintain
+modify it! This section explains how to make and maintain
 modifications in a safe and convenient fashion.
 
 If you do modify Zulip and then report an issue you see in your
 modified version of Zulip, please be responsible about communicating
 that fact:
 
-* Ideally, you'd reproduce the issue in an unmodified version (e.g. on
-[chat.zulip.org](../contributing/chat-zulip-org.md) or
-[zulip.com](https://zulip.com)).
-* Where that is difficult or you think it's very unlikely your changes
-are related to the issue, just mention your changes in the issue report.
+- Ideally, you'd reproduce the issue in an unmodified version (e.g. on
+  [chat.zulip.org](../contributing/chat-zulip-org.md) or
+  [zulip.com](https://zulip.com)).
+- Where that is difficult or you think it's very unlikely your changes
+  are related to the issue, just mention your changes in the issue report.
 
 If you're looking to modify Zulip by applying changes developed by the
-Zulip core team and merged into master, skip to [this
-section](#applying-changes-from-master).
+Zulip core team and merged into `main`, skip to [this
+section](#applying-changes-from-main).
 
 ## Making changes
 
 One way to modify Zulip is to just edit files under
-`/home/zulip/deployments/current` and then restart the server.  This
+`/home/zulip/deployments/current` and then restart the server. This
 can work OK for testing small changes to Python code or shell scripts.
 But we don't recommend this approach for maintaining changes because:
 
-* You cannot modify JavaScript, CSS, or other frontend files this way,
+- You cannot modify JavaScript, CSS, or other frontend files this way,
   because we don't include them in editable form in our production
   release tarballs (doing so would make our release tarballs much
   larger without any runtime benefit).
-* You will need to redo your changes after you next upgrade your Zulip
+- You will need to redo your changes after you next upgrade your Zulip
   server (or they will be lost).
-* You need to remember to restart the server or your changes won't
+- You need to remember to restart the server or your changes won't
   have effect.
-* Your changes aren't tracked, so mistakes can be hard to debug.
+- Your changes aren't tracked, so mistakes can be hard to debug.
 
 Instead, we recommend the following GitHub-based workflow (see [our
 Git guide][git-guide] if you need a primer):
 
-* Decide where you're going to edit Zulip's code.  We recommend [using
+- Decide where you're going to edit Zulip's code. We recommend [using
   the Zulip development environment](../development/overview.md) on
   a desktop or laptop as it will make it extremely convenient for you
-  to test your changes without deploying them in production.  But if
+  to test your changes without deploying them in production. But if
   your changes are small or you're OK with risking downtime, you don't
   strictly need it; you just need an environment with Git installed.
-* **Important**.  Determine what Zulip version you're running on your
-  server.  You can check by inspecting `ZULIP_VERSION` in
+- **Important**. Determine what Zulip version you're running on your
+  server. You can check by inspecting `ZULIP_VERSION` in
   `/home/zulip/deployments/current/version.py` (we'll use `2.0.4`
-  below).  If you apply your changes to the wrong version of Zulip,
+  below). If you apply your changes to the wrong version of Zulip,
   it's likely to fail and potentially cause downtime.
-* [Fork and clone][fork-clone] the [zulip/zulip][] repository on
+- [Fork and clone][fork-clone] the [zulip/zulip][] repository on
   [GitHub](https://github.com).
-* Create a branch (named `acme-branch` below) containing your changes:
+- Create a branch (named `acme-branch` below) containing your changes:
 
-```
+```bash
 cd zulip
 git checkout -b acme-branch 2.0.4
 ```
 
-* Use your favorite code editor to modify Zulip.
-* Commit your changes and push them to GitHub:
+- Use your favorite code editor to modify Zulip.
+- Commit your changes and push them to GitHub:
 
-```
+```bash
 git commit -a
 
 # Use `git diff` to verify your changes are what you expect
@@ -558,10 +656,10 @@ git diff 2.0.4 acme-branch
 git push origin +acme-branch
 ```
 
-* Log in to your Zulip server and configure and use
-[upgrade-zulip-from-git][] to install the changes; remember to
-configure `git_repo_url` to point to your fork on GitHub and run it as
-`upgrade-zulip-from-git acme-branch`.
+- Log in to your Zulip server and configure and use
+  [upgrade-zulip-from-git][] to install the changes; remember to
+  configure `git_repo_url` to point to your fork on GitHub and run it as
+  `upgrade-zulip-from-git acme-branch`.
 
 This workflow solves all of the problems described above: your change
 will be compiled and installed correctly (restarting the server), and
@@ -570,21 +668,21 @@ across future Zulip releases.
 
 ### Upgrading to future releases
 
-Eventually, you'll want to upgrade to a new Zulip release.  If your
+Eventually, you'll want to upgrade to a new Zulip release. If your
 changes were integrated into that Zulip release or are otherwise no
 longer needed, you can just [upgrade as
-usual](#upgrading-to-a-release).  If you [upgraded to
-master](#upgrading-to-master); review that section again; new
+usual](#upgrading-to-a-release). If you [upgraded to
+`main`](#upgrading-to-main); review that section again; new
 maintenance releases are likely "older" than your current installation
-and you might need to upgrade to the master again rather than to the
+and you might need to upgrade to `main` again rather than to the
 new maintenance release.
 
 Otherwise, you'll need to update your branch by rebasing your changes
 (starting from a [clone][fork-clone] of the [zulip/zulip][]
-repository).  The example below assumes you have a branch off of 2.0.4
+repository). The example below assumes you have a branch off of 2.0.4
 and want to upgrade to 2.1.0.
 
-```
+```bash
 cd zulip
 git fetch --tags upstream
 git checkout acme-branch
@@ -605,29 +703,29 @@ branch, as before.
 If you are using [docker-zulip][], there are two things that are
 different from the above:
 
-* Because of how container images work, editing files directly is even
+- Because of how container images work, editing files directly is even
   more precarious, because Docker is designed for working with
   container images and may lose your changes.
-* Instead of running `upgrade-zulip-from-git`, you will need to use
+- Instead of running `upgrade-zulip-from-git`, you will need to use
   the [docker upgrade workflow][docker-zulip-upgrade] to build a
   container image based on your modified version of Zulip.
 
 [docker-zulip]: https://github.com/zulip/docker-zulip
 [docker-zulip-upgrade]: https://github.com/zulip/docker-zulip#upgrading-from-a-git-repository
 
-## Applying changes from master
+## Applying changes from `main`
 
 If you are experiencing an issue that has already been fixed by the
 Zulip development community, and you'd like to get the fix now, you
-have a few options.  There are two possible ways you might get those
+have a few options. There are two possible ways you might get those
 fixes on your local Zulip server without waiting for an official release.
 
 ### Applying a small change
 
-Many bugs have small/simple fixes.  In this case, you can use the Git
+Many bugs have small/simple fixes. In this case, you can use the Git
 workflow [described above](#making-changes), using:
 
-```
+```bash
 git fetch upstream
 git cherry-pick abcd1234
 ```
@@ -637,35 +735,35 @@ of the change you'd like).
 
 In general, we can't provide unpaid support for issues caused by
 cherry-picking arbitrary commits if the issues don't also affect
-master or an official release.
+`main` or an official release.
 
 The exception to this rule is when we ask or encourage a user to apply
 a change to their production system to help verify the fix resolves
-the issue for them.  You can expect the Zulip community to be
+the issue for them. You can expect the Zulip community to be
 responsive in debugging any problems caused by a patch we asked
 you to apply.
 
 Also, consider asking whether a small fix that is important to you can
-be added to the current stable release branch (E.g. `2.1.x`).  In
+be added to the current stable release branch (E.g. `2.1.x`). In
 addition to scheduling that change for Zulip's next bug fix release,
 we support changes in stable release branches as though they were
 released.
 
-### Upgrading to master
+### Upgrading to `main`
 
 Many Zulip servers (including chat.zulip.org and zulip.com) upgrade to
-master on a regular basis to get the latest features.  Before doing
+`main` on a regular basis to get the latest features. Before doing
 so, it's important to understand how to happily run a server based on
-master.
+`main`.
 
-For background, it's backporting arbitrary patches from master to an
-older version requires some care.  Common issues include:
+For background, it's backporting arbitrary patches from `main` to an
+older version requires some care. Common issues include:
 
-* Changes containing database migrations (new files under
-  `*/migrations/`), which includes most new features.  We
+- Changes containing database migrations (new files under
+  `*/migrations/`), which includes most new features. We
   don't support applying database migrations out of order.
-* Changes that are stacked on top of other changes to the same system.
-* Essentially any patch with hundreds of lines of changes will have
+- Changes that are stacked on top of other changes to the same system.
+- Essentially any patch with hundreds of lines of changes will have
   merge conflicts and require extra work to apply.
 
 While it's possible to backport these sorts of changes, you're
@@ -673,52 +771,52 @@ unlikely to succeed without help from the core team via a support
 contract.
 
 If you need an unreleased feature, the best path is usually to
-upgrade to Zulip master using [upgrade-zulip-from-git][].  Before
-upgrading to master, make sure you understand:
+upgrade to Zulip `main` using [upgrade-zulip-from-git][]. Before
+upgrading to `main`, make sure you understand:
 
-* In Zulip's version numbering scheme, `master` will always be "newer"
+- In Zulip's version numbering scheme, `main` will always be "newer"
   than the latest maintenance release (E.g. `3.1` or `2.1.6`) and
   "older" than the next major release (E.g. `3.0` or `4.0`).
-* The `master` branch is under very active development; dozens of new
-  changes are integrated into it on most days.  The `master` branch
+- The `main` branch is under very active development; dozens of new
+  changes are integrated into it on most days. The `main` branch
   can have thousands of changes not present in the latest release (all
-  of which will be included in our next major release).  On average
-  `master` usually has fewer total bugs than the latest release
+  of which will be included in our next major release). On average
+  `main` usually has fewer total bugs than the latest release
   (because we fix hundreds of bugs in every major release) but it
   might have some bugs that are more severe than we would consider
   acceptable for a release.
-* We deploy `master` to chat.zulip.org and zulip.com on a regular
+- We deploy `main` to chat.zulip.org and zulip.com on a regular
   basis (often daily), so it's very important to the project that it
-  be stable.  Most regressions will be minor UX issues or be fixed
+  be stable. Most regressions will be minor UX issues or be fixed
   quickly, because we need them to be fixed for Zulip Cloud.
-* The development community is very interested in helping debug issues
-  that arise when upgrading from the latest release to master, since
+- The development community is very interested in helping debug issues
+  that arise when upgrading from the latest release to `main`, since
   they provide us an opportunity to fix that category of issue before
-  our next major release.  (Much more so than we are in helping folks
-  debug other custom changes).  That said, we cannot make any
+  our next major release. (Much more so than we are in helping folks
+  debug other custom changes). That said, we cannot make any
   guarantees about how quickly we'll resolve an issue to folks without
   a formal support contract.
-* We do not support downgrading from `master` to earlier versions, so
+- We do not support downgrading from `main` to earlier versions, so
   if downtime for your Zulip server is unacceptable, make sure you
   have a current
   [backup](../production/export-and-import.html#backups) in case the
   upgrade fails.
-* Our changelog contains [draft release
+- Our changelog contains [draft release
   notes](../overview/changelog.md) available listing major changes
-  since the last release.  The **Upgrade notes** section will always
+  since the last release. The **Upgrade notes** section will always
   be current, even if some new features aren't documented.
-* Whenever we push a security or maintenance release, the changes in
-  that release will always be merged to master; so you can get the
-  security fixes by upgrading to master.
-* You can always upgrade from master to the next major release when it
+- Whenever we push a security or maintenance release, the changes in
+  that release will always be merged to `main`; so you can get the
+  security fixes by upgrading to `main`.
+- You can always upgrade from `main` to the next major release when it
   comes out, using either [upgrade-zulip-from-git][] or the release
-  tarball.  So there's no risk of upgrading to `master` resulting in
+  tarball. So there's no risk of upgrading to `main` resulting in
   a system that's not upgradeable back to a normal release.
 
 ## Contributing patches
 
 Zulip contains thousands of changes submitted by volunteer
-contributors like you.  If your changes are likely to be of useful to
+contributors like you. If your changes are likely to be of useful to
 other organizations, consider [contributing
 them](../overview/contributing.md).
 

docs/production/upload-backends.md

@@ -18,13 +18,13 @@ provider supported by the `boto` library).
 ## S3 backend configuration
 
 Here, we document the process for configuring Zulip's S3 file upload
-backend.  To enable this backend, you need to do the following:
+backend. To enable this backend, you need to do the following:
 
 1. In the AWS management console, create a new IAM account (aka API
-user) for your Zulip server, and two buckets in S3, one for uploaded
-files included in messages, and another for user avatars.  You need
-two buckets because the "user avatars" bucket is generally configured
-as world-readable, whereas the "uploaded files" one is not.
+   user) for your Zulip server, and two buckets in S3, one for uploaded
+   files included in messages, and another for user avatars. You need
+   two buckets because the "user avatars" bucket is generally configured
+   as world-readable, whereas the "uploaded files" one is not.
 
 1. Set `s3_key` and `s3_secret_key` in /etc/zulip/zulip-secrets.conf
    to be the S3 access and secret keys for the IAM account.
@@ -44,31 +44,31 @@ as world-readable, whereas the "uploaded files" one is not.
    setting to your default AWS region's code (e.g. `"eu-central-1"`).
 
 1. You will need to configure `nginx` to direct requests for uploaded
-    files to the Zulip server (which will then serve a redirect to the
-    appropriate place in S3), rather than serving them directly.
+   files to the Zulip server (which will then serve a redirect to the
+   appropriate place in S3), rather than serving them directly.
 
-    With Zulip 1.9.0 and newer, you can do this automatically with the
-    following commands run as root:
+   With Zulip 1.9.0 and newer, you can do this automatically with the
+   following commands run as root:
 
-    ```
-    crudini --set /etc/zulip/zulip.conf application_server no_serve_uploads true
-    /home/zulip/deployments/current/scripts/zulip-puppet-apply
-    ```
+   ```bash
+   crudini --set /etc/zulip/zulip.conf application_server no_serve_uploads true
+   /home/zulip/deployments/current/scripts/zulip-puppet-apply
+   ```
 
-    (The first line will update your `/etc/zulip/zulip.conf`).
+   (The first line will update your `/etc/zulip/zulip.conf`).
 
-    With older Zulip, you need to edit
-    `/etc/nginx/sites-available/zulip-enterprise` to comment out the
-    `nginx` configuration block for `/user_avatars` and the `include
-    /etc/nginx/zulip-include/uploads.route` line and then reload the
-    `nginx` service (`service nginx reload`).
+   With older Zulip, you need to edit
+   `/etc/nginx/sites-available/zulip-enterprise` to comment out the
+   `nginx` configuration block for `/user_avatars` and the
+   `include /etc/nginx/zulip-include/uploads.route` line and then
+   reload the `nginx` service (`service nginx reload`).
 
 1. Finally, restart the Zulip server so that your settings changes
    take effect
    (`/home/zulip/deployments/current/scripts/restart-server`).
 
 It's simplest to just do this configuration when setting up your Zulip
-server for production usage.  Note that if you had any existing
+server for production usage. Note that if you had any existing
 uploading files, this process does not upload them to Amazon S3; see
 [migration instructions](#migrating-from-local-uploads-to-amazon-s3-backend)
 below for those steps.
@@ -78,12 +78,12 @@ below for those steps.
 ## S3 bucket policy
 
 The best way to do the S3 integration with Amazon is to create a new
-IAM user just for your Zulip server with limited permissions.  For
+IAM user just for your Zulip server with limited permissions. For
 each of the two buckets, you'll want to
 [add an S3 bucket policy](https://awspolicygen.s3.amazonaws.com/policygen.html)
 entry that looks something like this:
 
-```
+```json
 {
     "Version": "2012-10-17",
     "Id": "Policy1468991802321",
@@ -117,7 +117,7 @@ entry that looks something like this:
 The avatars bucket is intended to be world-readable, so you'll also
 need a block like this:
 
-```
+```json
 {
     "Sid": "Stmt1468991795389",
     "Effect": "Allow",
@@ -127,32 +127,31 @@ need a block like this:
     "Action": "s3:GetObject",
     "Resource": "arn:aws:s3:::BUCKET_NAME_HERE/*"
 }
-
 ```
 
-The file-uploads bucket should not be world-readable.  See the
+The file-uploads bucket should not be world-readable. See the
 [documentation on the Zulip security model](security-model.md) for
 details on the security model for uploaded files.
 
 ## Migrating from local uploads to Amazon S3 backend
 
 As you scale your server, you might want to migrate the uploads from
-your local backend to Amazon S3.  Follow these instructions, step by
+your local backend to Amazon S3. Follow these instructions, step by
 step, to do the migration.
 
 1. First, [set up the S3 backend](#s3-backend-configuration) in the settings
-    (all the auth stuff), but leave `LOCAL_UPLOADS_DIR` set -- the
-    migration tool will need that value to know where to find your uploads.
+   (all the auth stuff), but leave `LOCAL_UPLOADS_DIR` set -- the
+   migration tool will need that value to know where to find your uploads.
 2. Run `./manage.py transfer_uploads_to_s3`. This will upload all the
-    files from the local uploads directory to Amazon S3. By default,
-    this command runs on 6 parallel processes, since uploading is a
-    latency-sensitive operation.  You can control this parameter using
-    the `--processes` option.
+   files from the local uploads directory to Amazon S3. By default,
+   this command runs on 6 parallel processes, since uploading is a
+   latency-sensitive operation. You can control this parameter using
+   the `--processes` option.
 3. Once the transfer script completes, disable `LOCAL_UPLOADS_DIR`, and
-    restart your server (continuing the last few steps of the S3
-    backend setup instructions).
+   restart your server (continuing the last few steps of the S3
+   backend setup instructions).
 
-Congratulations!  Your uploaded files are now migrated to S3.
+Congratulations! Your uploaded files are now migrated to S3.
 
 **Caveat**: The current version of this tool does not migrate an
-  uploaded organization avatar or logo.
+uploaded organization avatar or logo.

docs/production/video-calls.md

@@ -15,18 +15,18 @@ installation, you'll need to register a custom Zoom app as follows:
 
 1. Create an app with the **OAuth** type.
 
-   * Choose an app name such as "ExampleCorp Zulip".
-   * Select **User-managed app**.
-   * Disable the option to publish the app on the Marketplace.
-   * Click **Create**.
+   - Choose an app name such as "ExampleCorp Zulip".
+   - Select **User-managed app**.
+   - Disable the option to publish the app on the Marketplace.
+   - Click **Create**.
 
 1. Inside of the Zoom app management page:
 
-   * On the **App Credentials** tab, set both the **Redirect URL for
+   - On the **App Credentials** tab, set both the **Redirect URL for
      OAuth** and the **Whitelist URL** to
      `https://zulip.example.com/calls/zoom/complete` (replacing
      `zulip.example.com` by your main Zulip hostname).
-   * On the **Scopes** tab, add the `meeting:write` scope.
+   - On the **Scopes** tab, add the `meeting:write` scope.
 
 You can then configure your Zulip server to use that Zoom app as
 follows:
@@ -40,7 +40,7 @@ follows:
 1. Restart the Zulip server with
    `/home/zulip/deployments/current/scripts/restart-server`.
 
-This enables Zoom support in your Zulip server.  Finally, [configure
+This enables Zoom support in your Zulip server. Finally, [configure
 Zoom as the video call
 provider](https://zulip.com/help/start-a-call) in the Zulip
 organization(s) where you want to use it.
@@ -71,7 +71,7 @@ Server as follows:
 3. Restart the Zulip server with
    `/home/zulip/deployments/current/scripts/restart-server`.
 
-This enables Big Blue Button support in your Zulip server.  Finally, [configure
+This enables Big Blue Button support in your Zulip server. Finally, [configure
 Big Blue Button as the video call
 provider](https://zulip.com/help/start-a-call) in the Zulip
 organization(s) where you want to use it.

docs/subsystems/analytics.md

@@ -29,7 +29,7 @@ There are three main components:
 
 The next several sections will dive into the details of these components.
 
-## The *Count database tables
+## The \*Count database tables
 
 The Zulip analytics system is built around collecting time series data in a
 set of database tables. Each of these tables has the following fields:
@@ -76,7 +76,7 @@ by the system and with what data.
 ## The FillState table
 
 The default Zulip production configuration runs a cron job once an hour that
-updates the *Count tables for each of the CountStats in the COUNT_STATS
+updates the \*Count tables for each of the CountStats in the COUNT_STATS
 dictionary. The FillState table simply keeps track of the last end_time that
 we successfully updated each stat. It also enables the analytics system to
 recover from errors (by retrying) and to monitor that the cron job is
@@ -103,23 +103,23 @@ There are a few important principles that we use to make the system
 efficient:
 
 - Not repeating work to keep things up to date (via FillState)
-- Storing data in the *Count tables to avoid our endpoints hitting the core
+- Storing data in the \*Count tables to avoid our endpoints hitting the core
   Message/UserMessage tables is key, because some queries could take minutes
   to calculate. This allows any expensive operations to run offline, and
   then the endpoints to server data to users can be fast.
 - Doing expensive operations inside the database, rather than fetching data
   to Python and then sending it back to the database (which can be far
-  slower if there's a lot of data involved).  The Django ORM currently
+  slower if there's a lot of data involved). The Django ORM currently
   doesn't support the "insert into .. select" type SQL query that's needed
   for this, which is why we use raw database queries (which we usually avoid
   in Zulip) rather than the ORM.
 - Aggregating where possible to avoid unnecessary queries against the
-  Message and UserMessage tables.  E.g. rather than querying the Message
+  Message and UserMessage tables. E.g. rather than querying the Message
   table both to generate sent message counts for each realm and again for
   each user, we just query for each user, and then add up the numbers for
   the users to get the totals for the realm.
 - Not storing rows when the value is 0. An hourly user stat would otherwise
-  collect 24 * 365 * roughly .5MB per db row = 4GB of data per user per
+  collect 24 \* 365 \* roughly .5MB per db row = 4GB of data per user per
   year, most of whose values are 0. A related note is to be cautious about
   adding queries that are typically non-0 instead of being typically 0.
 
@@ -129,25 +129,25 @@ There are a few types of automated tests that are important for this sort of
 system:
 
 - Most important: Tests for the code path that actually populates data into
-  the analytics tables.  These are most important, because it can be very
+  the analytics tables. These are most important, because it can be very
   expensive to fix bugs in the logic that generates these tables (one
   basically needs to regenerate all of history for those tables), and these
-  bugs are hard to discover.  It's worth taking the time to think about
+  bugs are hard to discover. It's worth taking the time to think about
   interesting corner cases and add them to the test suite.
 - Tests for the backend views code logic for extracting data from the
   database and serving it to clients.
 
-For manual backend testing, it sometimes can be valuable to use `./manage.py
-dbshell` to inspect the tables manually to check that things look right; but
-usually anything you feel the need to check manually, you should add some
-sort of assertion for to the backend analytics tests, to make sure it stays
-that way as we refactor.
+For manual backend testing, it sometimes can be valuable to use
+`./manage.py dbshell` to inspect the tables manually to check that
+things look right; but usually anything you feel the need to check
+manually, you should add some sort of assertion for to the backend
+analytics tests, to make sure it stays that way as we refactor.
 
 ## LoggingCountStats
 
 The system discussed above is designed primarily around the technical
 problem of showing useful analytics about things where the raw data is
-already stored in the database (e.g. Message, UserMessage).  This is great
+already stored in the database (e.g. Message, UserMessage). This is great
 because we can always backfill that data to the beginning of time, but of
 course sometimes one wants to do analytics on things that aren't worth
 storing every data point for (e.g. activity data, request performance
@@ -161,10 +161,10 @@ statistics, etc.). There is currently a reference implementation of a
 The main testing approach for the /stats page UI is manual testing.
 For most UI testing, you can visit `/stats/realm/analytics` while
 logged in as Iago (this is the server administrator view of stats for
-a given realm).  The only piece that you can't test here is the "Me"
-buttons, which won't have any data.  For those, you can instead log in
+a given realm). The only piece that you can't test here is the "Me"
+buttons, which won't have any data. For those, you can instead log in
 as the `shylock@analytics.ds` in the `analytics` realm and visit
-`/stats` there (which is only a bit more work).  Note that the
+`/stats` there (which is only a bit more work). Note that the
 `analytics` realm is a shell with no streams, so you'll only want to
 use it for testing the graphs.
 
@@ -221,9 +221,9 @@ Tips and tricks:
 ### /activity page
 
 - There's a somewhat less developed /activity page, for server
-  administrators, showing data on all the realms on a server.  To
+  administrators, showing data on all the realms on a server. To
   access it, you need to have the `is_staff` bit set on your
-  UserProfile object.  You can set it using `manage.py shell` and
-  editing the UserProfile object directly.  A great future project is
+  UserProfile object. You can set it using `manage.py shell` and
+  editing the UserProfile object directly. A great future project is
   to clean up that page's data sources, and make this a documented
   interface.

docs/subsystems/api-release-checklist.md

@@ -12,7 +12,7 @@ The steps below assume that you are familiar with the material
 presented [here](https://packaging.python.org/tutorials/installing-packages/).
 
 1. [Reconfigure the package][2], if need be (upgrade version
-  number, development status, and so on).
+   number, development status, and so on).
 
 2. Create a [source distribution][3].
 

docs/subsystems/billing.md

@@ -4,8 +4,9 @@ Zulip uses a third party (Stripe) for billing, so working on the billing
 system requires a little bit of setup.
 
 To set up the development environment to work on the billing code:
-* Create a Stripe account
-* Go to <https://dashboard.stripe.com/account/apikeys>, and add the
+
+- Create a Stripe account
+- Go to <https://dashboard.stripe.com/account/apikeys>, and add the
   publishable key and secret key as `stripe_publishable_key` and
   `stripe_secret_key` to `zproject/dev-secrets.conf`.
 
@@ -15,13 +16,14 @@ Nearly all the billing-relevant code lives in `corporate/`.
 
 Stripe makes pretty regular updates to their API. The process for upgrading
 our code is:
-* Go to <https://dashboard.stripe.com/developers> in your Stripe account.
-* Upgrade the API version.
-* Run `tools/test-backend --generate-stripe-fixtures`
-* Fix any failing tests, and manually look through `git diff` to understand
+
+- Go to <https://dashboard.stripe.com/developers> in your Stripe account.
+- Upgrade the API version.
+- Run `tools/test-backend --generate-stripe-fixtures`
+- Fix any failing tests, and manually look through `git diff` to understand
   the changes.
-* If there are no material changes, commit the diff, and open a PR.
-* Ask Rishi or Tim to go to <https://dashboard.stripe.com/developers> in the
+- If there are no material changes, commit the diff, and open a PR.
+- Ask Rishi or Tim to go to <https://dashboard.stripe.com/developers> in the
   zulipchat Stripe account, and upgrade the API version there.
 
 We currently aren't set up to do version upgrades where there are breaking

docs/subsystems/caching.md

@@ -1,7 +1,7 @@
 # Caching in Zulip
 
 Like any product with good performance characteristics, Zulip makes
-extensive use of caching.  This article talks about our caching
+extensive use of caching. This article talks about our caching
 strategy, focusing on how we use `memcached` (since it's the thing
 people generally think about when they ask about how a server does
 caching).
@@ -9,7 +9,7 @@ caching).
 ## Backend caching with memcached
 
 On the backend, Zulip uses `memcached`, a popular key-value store, for
-caching.  Our `memcached` caching helps let us optimize Zulip's
+caching. Our `memcached` caching helps let us optimize Zulip's
 performance and scalability, since most requests don't need to talk to
 the database (which, even for a trivial query with everything on the
 same machine, usually takes 3-10x as long as a memcached fetch).
@@ -37,11 +37,11 @@ Zulip's Django codebase, all one needs to do is call the standard
 accessor functions for data (like `get_user` or `get_stream` to fetch
 user and stream objects, or for view code, functions like
 `access_stream_by_id`, which checks permissions), and everything will
-work great.  The data fetches automatically benefit from `memcached`
+work great. The data fetches automatically benefit from `memcached`
 caching, since those accessor methods have already been written to
 transparently use Zulip's memcached caching system, and the developer
 doesn't need to worry about whether the data returned is up-to-date:
-it is.  In the following sections, we'll talk about how we make this
+it is. In the following sections, we'll talk about how we make this
 work.
 
 As a sidenote, the policy of using these accessor functions wherever
@@ -51,7 +51,7 @@ also generally take care of details you might not think about
 It's amazing how slightly tricky logic that's duplicated in several
 places invariably ends up buggy in some of those places, and in
 aggregate we call these accessor functions hundreds of times in
-Zulip.  But the caching is certainly a nice bonus.
+Zulip. But the caching is certainly a nice bonus.
 
 ### The core implementation
 
@@ -59,7 +59,7 @@ The `get_user` function is a pretty typical piece of code using this
 framework; as you can see, it's very little code on top of our
 `cache_with_key` decorator:
 
-``` python
+```python
 def user_profile_cache_key_id(email: str, realm_id: int) -> str:
     return u"user_profile:%s:%s" % (make_safe_digest(email.strip()), realm_id,)
 
@@ -73,22 +73,23 @@ def get_user(email: str, realm: Realm) -> UserProfile:
 ```
 
 This decorator implements a pretty classic caching paradigm:
-* The `user_profile_cache_key` function defines a unique map from a
-  canonical form of its arguments to a string.  These strings are
+
+- The `user_profile_cache_key` function defines a unique map from a
+  canonical form of its arguments to a string. These strings are
   namespaced (the `user_profile:` part) so that they won't overlap
   with other caches, and encode the arguments so that two uses of this
-  cache won't overlap.  In this case, a hash of the email address and
-  realm ID are those canonicalized arguments.  (The `make_safe_digest`
+  cache won't overlap. In this case, a hash of the email address and
+  realm ID are those canonicalized arguments. (The `make_safe_digest`
   is important to ensure we don't send special characters to
-  memcached).  And we have two versions, depending whether the caller
+  memcached). And we have two versions, depending whether the caller
   has access to a `Realm` or just a `realm_id`.
-* When `get_user` is called, `cache_with_key` will compute the key,
+- When `get_user` is called, `cache_with_key` will compute the key,
   and do a Django `cache_get` query for the key (which goes to
-  memcached).  If the key is in the cache, it just returns the value.
+  memcached). If the key is in the cache, it just returns the value.
   Otherwise, it fetches the value from the database (using the actual
   code in the body of `get_user`), and then stores the value back to
   that memcached key before returning the result to the caller.
-* Cache entries expire after the timeout; in this case, a week.
+- Cache entries expire after the timeout; in this case, a week.
   Though in frequently deployed environments like chat.zulip.org,
   often cache entries will stop being used long before that, because
   `KEY_PREFIX` is rotated every time we deploy to production; see
@@ -101,12 +102,12 @@ huge amount of otherwise very self-similar caching code.
 
 The one thing to be really careful with in using `cache_with_key` is
 that if an item is in the cache, the body of `get_user` (above) is
-never called.  This means some things that might seem like clever code
-reuse are actually a really bad idea.  For example:
+never called. This means some things that might seem like clever code
+reuse are actually a really bad idea. For example:
 
-* Don't add a `get_active_user` function that uses the same cache key
+- Don't add a `get_active_user` function that uses the same cache key
   function as `get_user` (but with a different query that filters our
-  deactivated users).  If one called `get_active_user` to access a
+  deactivated users). If one called `get_active_user` to access a
   deactivated user, the right thing would happen, but if you called
   `get_user` to access that user first, then the `get_active_user`
   function would happily return the user from the cache, without ever
@@ -118,13 +119,13 @@ even if they feature the same objects.
 ### Cache invalidation after writes
 
 The caching strategy described above works pretty well for anything
-where the state it's storing is immutable (i.e. never changes).  With
+where the state it's storing is immutable (i.e. never changes). With
 mutable state, one needs to do something to ensure that the Python
 processes don't end up fetching stale data from the cache after a
 write to the database.
 
 We handle this using Django's longstanding
-[post_save signals][post-save-signals] feature.  Django signals let
+[post_save signals][post-save-signals] feature. Django signals let
 you configure some code to run every time Django does something (for
 `post_save`, right after any write to the database using Django's
 `.save()`).
@@ -132,18 +133,18 @@ you configure some code to run every time Django does something (for
 There's a handful of lines in `zerver/models.py` like these that
 configure this:
 
-```
+```python
 post_save.connect(flush_realm, sender=Realm)
 post_save.connect(flush_user_profile, sender=UserProfile)
 ```
 
 Once this `post_save` hook is registered, whenever one calls
 `user_profile.save(...)` with a UserProfile object in our Django
-project, Django will call the `flush_user_profile` function.  Zulip is
+project, Django will call the `flush_user_profile` function. Zulip is
 systematic about using the standard Django `.save()` function for
 modifying `user_profile` objects (and passing the `update_fields`
 argument to `.save()` consistently, which encodes which fields on an
-object changed).  This means that all we have to do is write those
+object changed). This means that all we have to do is write those
 cache-flushing functions correctly, and people writing Zulip code
 won't need to think about (or even know about!) the caching.
 
@@ -156,7 +157,7 @@ those keys from the cache (if present).
 Maintaining these flush functions requires some care (every time we
 add a new cache, we need to look through them), but overall it's a
 pretty simple algorithm: If the changed data appears in any form in a
-given cache key, that cache key needs to be cleared.  E.g. the
+given cache key, that cache key needs to be cleared. E.g. the
 `active_user_ids_cache_key` cache for a realm needs to be flushed
 whenever a new user is created in that realm, or user is
 deactivated/reactivated, even though it's just a list of IDs and thus
@@ -175,8 +176,8 @@ code in Zulip just needs to modify Django model objects and call
 
 When upgrading a Zulip server, it's important to avoid having one
 version of the code interact with cached objects from another version
-that has a different data layout.  In Zulip, we avoid this through
-some clever caching strategies.  Each "deployment directory" for Zulip
+that has a different data layout. In Zulip, we avoid this through
+some clever caching strategies. Each "deployment directory" for Zulip
 in production has inside it a `var/remote_cache_prefix` file,
 containing a cache prefix (`KEY_PREFIX` in the code) that is
 automatically appended to the start of any cache keys accessed by that
@@ -188,19 +189,19 @@ from inconsistent versions of the source code / data formats in the cache.
 
 ### Automated testing and memcached
 
-For Zulip's `test-backend` unit tests, we use the same strategy.  In
+For Zulip's `test-backend` unit tests, we use the same strategy. In
 particular, we just edit `KEY_PREFIX` before each unit test; this
 means each of the thousands of test cases in Zulip has its own
-independent memcached key namespace on each run of the unit tests.  As
+independent memcached key namespace on each run of the unit tests. As
 a result, we never have to worry about memcached caching causing
 problems across multiple tests.
 
-This is a really important detail.  It makes it possible for us to do
+This is a really important detail. It makes it possible for us to do
 assertions in our tests on the number of database queries or memcached
 queries that are done as part of a particular function/route, and have
 those checks consistently get the same result (those tests are great
 for catching bugs where we accidentally do database queries in a
-loop).  And it means one can debug failures in the test suite without
+loop). And it means one can debug failures in the test suite without
 having to consider the possibility that memcached is somehow confusing
 the situation.
 
@@ -225,8 +226,8 @@ You can run the server with that behavior disabled using
 ### Performance
 
 One thing be careful about with memcached queries is to avoid doing
-them in loops (the same applies for database queries!).  Instead, one
-should use a bulk query.  We have a fancy function,
+them in loops (the same applies for database queries!). Instead, one
+should use a bulk query. We have a fancy function,
 `generate_bulk_cached_fetch`, which is super magical and handles this
 for us, with support for a bunch of fancy features like marshalling
 data before/after going into the cache (e.g. to compress `message`
@@ -236,12 +237,13 @@ objects to minimize data transfer between Django and memcached).
 
 We generally try to avoid in-process backend caching in Zulip's Django
 codebase, because every Zulip production installation involves
-multiple servers.  We do have a few, however:
-* `per_request_display_recipient_cache`: A cache flushed at the start
+multiple servers. We do have a few, however:
+
+- `per_request_display_recipient_cache`: A cache flushed at the start
   of every request; this simplifies correctly implementing our goal of
   not repeatedly fetching the "display recipient" (e.g. stream name)
   for each message in the `GET /messages` codebase.
-* Caches of various data, like the `SourceMap` object, that are
+- Caches of various data, like the `SourceMap` object, that are
   expensive to construct, not needed for most requests, and don't
   change once a Zulip server has been deployed in production.
 
@@ -252,13 +254,12 @@ apps; details like which users exist, with metadata like names and
 avatars, similar details for streams, recent message history, etc.
 
 This data is fetched in the `/register` endpoint (or `page_params`
-for the webapp), and kept correct over time.  The key to keeping these
+for the webapp), and kept correct over time. The key to keeping these
 state up to date is Zulip's
 [real-time events system](../subsystems/events-system.md), which
 allows the server to notify clients whenever state that might be
-cached by clients is changed.  Clients are responsible for handling
+cached by clients is changed. Clients are responsible for handling
 the events, updating their state, and rerendering any UI components
 that might display the modified state.
 
-[post-save-signals]:
-https://docs.djangoproject.com/en/2.0/ref/signals/#post-save
+[post-save-signals]: https://docs.djangoproject.com/en/2.0/ref/signals/#post-save

docs/subsystems/client.md

@@ -1,7 +1,7 @@
 # Clients in Zulip
 
 `zerver.models.Client` is Zulip's analogue of the HTTP User-Agent
-header (and is populated from User-Agent).  It exists for use in
+header (and is populated from User-Agent). It exists for use in
 analytics and other places to provide human-readable summary data
 about "which Zulip client" was used for an operation (e.g. was it the
 Android app, the desktop app, or a bot?).
@@ -19,7 +19,7 @@ A `Client` is used to sort messages into client categories such as
 
 Generally, integrations in Zulip should declare a unique User-Agent,
 so that it's easy to figure out which integration is involved when
-debugging an issue.  For incoming webhook integrations, we do that
+debugging an issue. For incoming webhook integrations, we do that
 convenentialy via the auth decorators (as we will describe shortly);
 other integrations generally should set the first User-Agent element
 on their HTTP requests to something of the form

docs/subsystems/dependencies.md

@@ -1,22 +1,22 @@
 # Provisioning and third-party dependencies
 
 Zulip is a large project, with well over 100 third-party dependencies,
-and managing them well is essential to the quality of the project.  In
+and managing them well is essential to the quality of the project. In
 this document, we discuss the various classes of dependencies that
-Zulip has, and how we manage them.  Zulip's dependency management has
+Zulip has, and how we manage them. Zulip's dependency management has
 some really nice properties:
 
-* **Fast provisioning**.  When switching to a different commit in the
+- **Fast provisioning**. When switching to a different commit in the
   Zulip project with the same dependencies, it takes under 5 seconds
   to re-provision a working Zulip development environment after
-  switching.  If there are new dependencies, one only needs to wait to
+  switching. If there are new dependencies, one only needs to wait to
   download the new ones, not all the pre-existing dependencies.
-* **Consistent provisioning**.  Every time a Zulip development or
+- **Consistent provisioning**. Every time a Zulip development or
   production environment is provisioned/installed, it should end up
   using the exactly correct versions of all major dependencies.
-* **Low maintenance burden**.  To the extent possible, we want to
+- **Low maintenance burden**. To the extent possible, we want to
   avoid manual work and keeping track of things that could be
-  automated.  This makes it easy to keep running the latest versions
+  automated. This makes it easy to keep running the latest versions
   of our various dependencies.
 
 The purpose of this document is to detail all of Zulip's third-party
@@ -25,11 +25,11 @@ dependencies and how we manage their versions.
 ## Provisioning
 
 We refer to "provisioning" as the process of installing and
-configuring the dependencies of a Zulip development environment.  It's
+configuring the dependencies of a Zulip development environment. It's
 done using `tools/provision`, and the output is conveniently logged by
-`var/log/provision.log` to help with debugging.  Provisioning makes
-use of a lot of caching.  Some of those caches are not immune to being
-corrupted if you mess around with files in your repository a lot.  We
+`var/log/provision.log` to help with debugging. Provisioning makes
+use of a lot of caching. Some of those caches are not immune to being
+corrupted if you mess around with files in your repository a lot. We
 have `tools/provision --force` to (still fairly quickly) rerun most
 steps that would otherwise have been skipped due to caching.
 
@@ -42,13 +42,13 @@ also run an initial provision the first time only.
 In `version.py`, we have a special parameter, `PROVISION_VERSION`,
 which is used to help ensure developers don't spend time debugging
 test/linter/etc. failures that actually were caused by the developer
-rebasing and forgetting to provision".  `PROVISION_VERSION` has a
+rebasing and forgetting to provision". `PROVISION_VERSION` has a
 format of `x.y`; when `x` doesn't match the value from the last time
 the user provisioned, or `y` is higher than than the value from last
 time, most Zulip tools will crash early and ask the user to provision.
 This has empirically made a huge impact on how often developers spend
 time debugging a "weird failure" after rebasing that had an easy
-solution.  (Of course, the other key part of achieving this is all the
+solution. (Of course, the other key part of achieving this is all the
 work that goes into making sure that `provision` reliably leaves the
 development environment in a good state.)
 
@@ -58,29 +58,29 @@ require re-running provision, so don't forget about it!
 ## Philosophy on adding third-party dependencies
 
 In the Zulip project, we take a pragmatic approach to third-party
-dependencies.  Overall, if a third-party project does something well
+dependencies. Overall, if a third-party project does something well
 that Zulip needs to do (and has an appropriate license), we'd love to
-use it rather than reinventing the wheel.  If the third-party project
+use it rather than reinventing the wheel. If the third-party project
 needs some small changes to work, we prefer to make those changes and
-contribute them upstream.  When the upstream maintainer is slow to
+contribute them upstream. When the upstream maintainer is slow to
 respond, we may use a fork of the dependency until the code is merged
 upstream; as a result, we usually have a few packages in
 `requirements.txt` that are installed from a GitHub URL.
 
 What we look for in choosing dependencies is whether the project is
-well-maintained.  Usually one can tell fairly quickly from looking at
+well-maintained. Usually one can tell fairly quickly from looking at
 a project's issue tracker how well-managed it is: a quick look at how
 the issue tracker is managed (or not) and the test suite is usually
 enough to decide if a project is going to be a high-maintenance
-dependency or not.  That said, we do still take on some smaller
+dependency or not. That said, we do still take on some smaller
 dependencies that don't have a well-managed project, if we feel that
 using the project will still be a better investment than writing our
-own implementation of that project's functionality.  We've adopted a
+own implementation of that project's functionality. We've adopted a
 few projects in the past that had a good codebase but whose maintainer
 no longer had time for them.
 
 One case where we apply added scrutiny to third-party dependencies is
-JS libraries.  They are a particularly important concern because we
+JS libraries. They are a particularly important concern because we
 want to keep the Zulip webapp's JS bundle small, so that Zulip
 continues to load quickly on systems with low network bandwidth.
 We'll look at large JS libraries with much greater scrutiny for
@@ -94,20 +94,21 @@ For the third-party services like PostgreSQL, Redis, Nginx, and RabbitMQ
 that are documented in the
 [architecture overview](../overview/architecture-overview.md), we rely on the
 versions of those packages provided alongside the Linux distribution
-on which Zulip is deployed.  Because Zulip
+on which Zulip is deployed. Because Zulip
 [only supports Ubuntu in production](../production/requirements.md), this
 usually means `apt`, though we do support
-[other platforms in development](../development/setup-advanced.md).  Since
+[other platforms in development](../development/setup-advanced.md). Since
 we don't control the versions of these dependencies, we avoid relying
 on specific versions of these packages wherever possible.
 
 The exact lists of `apt` packages needed by Zulip are maintained in a
 few places:
-* For production, in our Puppet configuration, `puppet/zulip/`, using
+
+- For production, in our Puppet configuration, `puppet/zulip/`, using
   the `Package` and `SafePackage` directives.
-* For development, in `SYSTEM_DEPENDENCIES` in `tools/lib/provision.py`.
-* The packages needed to build a Zulip virtualenv, in
-  `VENV_DEPENDENCIES` in `scripts/lib/setup_venv.py`.  These are
+- For development, in `SYSTEM_DEPENDENCIES` in `tools/lib/provision.py`.
+- The packages needed to build a Zulip virtualenv, in
+  `VENV_DEPENDENCIES` in `scripts/lib/setup_venv.py`. These are
   separate from the rest because (1) we may need to install a
   virtualenv before running the more complex scripts that, in turn,
   install other dependencies, and (2) because that list is shared
@@ -121,79 +122,79 @@ extension, used by our [full-text search](full-text-search.md).
 We manage Python packages via the Python-standard `requirements.txt`
 system and virtualenvs, but there’s a number of interesting details
 about how Zulip makes this system work well for us that are worth
-highlighting.  The system is largely managed by the code in
+highlighting. The system is largely managed by the code in
 `scripts/lib/setup_venv.py`
 
-* **Using `pip` to manage dependencies**.  This is standard in the
+- **Using `pip` to manage dependencies**. This is standard in the
   Python ecosystem, and means we only need to record a list of
   versions in a `requirements.txt` file to declare what we're using.
   Since we have a few different installation targets, we maintain
   several `requirements.txt` format files in the `requirements/`
   directory (e.g. `dev.in` for development, `prod.in` for
   production, `docs.in` for ReadTheDocs, `common.in` for the vast
-  majority of packages common to prod and development, etc.).  We use
+  majority of packages common to prod and development, etc.). We use
   `pip install --no-deps` to ensure we only install the packages we
   explicitly declare as dependencies.
-* **virtualenv with pinned versions**.  For a large application like
+- **virtualenv with pinned versions**. For a large application like
   Zulip, it is important to ensure that we're always using consistent,
-  predictable versions of all of our Python dependencies.  To ensure
+  predictable versions of all of our Python dependencies. To ensure
   this, we install our dependencies in a [virtualenv][] that contains
   only the packages and versions that Zulip needs, and we always pin
   exact versions of our dependencies in our `requirements.txt` files.
   We pin exact versions, not minimum versions, so that installing
-  Zulip won't break if a dependency makes a buggy release.  A side
+  Zulip won't break if a dependency makes a buggy release. A side
   effect is that it's easy to debug problems caused by dependency
   upgrades, since we're always doing those upgrades with an explicit
   commit updating the `requirements/` directory.
-* **Pinning versions of indirect dependencies**.  We "pin" or "lock"
+- **Pinning versions of indirect dependencies**. We "pin" or "lock"
   the versions of our indirect dependencies files with
-  `tools/update-locked-requirements` (powered by `pip-compile`).  What
+  `tools/update-locked-requirements` (powered by `pip-compile`). What
   this means is that we have some "source" requirements files, like
   `requirements/common.in`, that declare the packages that Zulip
-  depends on directly.  Those packages have their own recursive
-  dependencies.  When adding or removing a dependency from Zulip, one
+  depends on directly. Those packages have their own recursive
+  dependencies. When adding or removing a dependency from Zulip, one
   simply edits the appropriate "source" requirements files, and then
-  runs `tools/update-locked-requirements`.  That tool will use `pip
-  compile` to generate the locked requirements files like `prod.txt`,
-  `dev.txt` etc files that explicitly declare versions of all of
-  Zulip's recursive dependencies.  For indirect dependencies (i.e.
-  dependencies not explicitly declared in the source requirements files),
-  it provides helpful comments explaining which direct dependency (or
-  dependencies) needed that indirect dependency.  The process for
-  using this system is documented in more detail in
+  runs `tools/update-locked-requirements`. That tool will use
+  `pip-compile` to generate the locked requirements files like
+  `prod.txt`, `dev.txt` etc files that explicitly declare versions of
+  all of Zulip's recursive dependencies. For indirect dependencies
+  (i.e. dependencies not explicitly declared in the source
+  requirements files), it provides helpful comments explaining which
+  direct dependency (or dependencies) needed that indirect dependency.
+  The process for using this system is documented in more detail in
   `requirements/README.md`.
-* **Caching of virtualenvs and packages**.  To make updating the
+- **Caching of virtualenvs and packages**. To make updating the
   dependencies of a Zulip installation efficient, we maintain a cache
   of virtualenvs named by the hash of the relevant `requirements.txt`
-  file (`scripts/lib/hash_reqs.py`).  These caches live under
-  `/srv/zulip-venv-cache/<hash>`.  That way, when re-provisioning a
+  file (`scripts/lib/hash_reqs.py`). These caches live under
+  `/srv/zulip-venv-cache/<hash>`. That way, when re-provisioning a
   development environment or deploying a new production version with
   the same Python dependencies, no downloading or installation is
-  required: we just use the same virtualenv.  When the only changes
+  required: we just use the same virtualenv. When the only changes
   are upgraded versions, we'll use [virtualenv-clone][] to clone the
   most similar existing virtualenv and then just upgrade the packages
-  needed, making small version upgrades extremely efficient.  And
+  needed, making small version upgrades extremely efficient. And
   finally, we use `pip`'s built-in caching to ensure that a specific
   version of a specific package is only downloaded once.
-* **Garbage-collecting caches**.  We have a tool,
+- **Garbage-collecting caches**. We have a tool,
   `scripts/lib/clean_venv_cache.py`, which will clean old cached
-  virtualenvs that are no longer in use.  In production, the algorithm
+  virtualenvs that are no longer in use. In production, the algorithm
   preserves recent virtualenvs as well as those in use by any current
   production deployment directory under `/home/zulip/deployments/`.
   This helps ensure that a Zulip installation doesn't leak large
   amounts of disk over time.
-* **Scripts**.  Often, we want a script running in production to use
-  the Zulip virtualenv.  To make that work without a lot of duplicated
+- **Scripts**. Often, we want a script running in production to use
+  the Zulip virtualenv. To make that work without a lot of duplicated
   code, we have a helpful function,
   `scripts.lib.setup_path.setup_path`, which on import will put the
-  currently running Python script into the Zulip virtualenv.  This is
+  currently running Python script into the Zulip virtualenv. This is
   called by `./manage.py` to ensure that our Django code always uses
   the correct virtualenv as well.
-* **Mypy type checker**.  Because we're using mypy in a strict mode,
+- **Mypy type checker**. Because we're using mypy in a strict mode,
   when you add use of a new Python dependency, you usually need to
   either adds stubs to the `stubs/` directory for the library, or edit
   `mypy.ini` in the root of the Zulip project to configure
-  `ignore_missing_imports` for the new library.  See
+  `ignore_missing_imports` for the new library. See
   [our mypy docs][mypy-docs] for more details.
 
 ### Upgrading packages
@@ -202,7 +203,7 @@ See the [README][requirements-readme] file in `requirements/` directory
 to learn how to upgrade a single Python package.
 
 [mypy-docs]: ../testing/mypy.md
-[requirements-readme]: https://github.com/zulip/zulip/blob/master/requirements/README.md#requirements
+[requirements-readme]: https://github.com/zulip/zulip/blob/main/requirements/README.md#requirements
 [stack-overflow]: https://askubuntu.com/questions/8653/how-to-keep-processes-running-after-ending-ssh-session
 [caching]: https://help.github.com/en/articles/caching-your-github-password-in-git
 
@@ -212,31 +213,31 @@ We use the same set of strategies described for Python dependencies
 for most of our JavaScript dependencies, so we won't repeat the
 reasoning here.
 
-* In a fashion very analogous to the Python codebase,
+- In a fashion very analogous to the Python codebase,
   `scripts/lib/node_cache.py` manages cached `node_modules`
-  directories in `/srv/zulip-npm-cache`.  Each is named by its hash,
+  directories in `/srv/zulip-npm-cache`. Each is named by its hash,
   computed by the `generate_sha1sum_node_modules` function.
   `scripts/lib/clean_node_cache.py` handles garbage-collection.
-* We use [yarn][], a `pip`-like tool for JavaScript, to download most
-  JavaScript dependencies.  Yarn talks to standard the [npm][]
-  repository.  We use the standard `package.json` file to declare our
+- We use [yarn][], a `pip`-like tool for JavaScript, to download most
+  JavaScript dependencies. Yarn talks to standard the [npm][]
+  repository. We use the standard `package.json` file to declare our
   direct dependencies, with sections for development and
-  production.  Yarn takes care of pinning the versions of indirect
+  production. Yarn takes care of pinning the versions of indirect
   dependencies in the `yarn.lock` file; `yarn install` updates the
   `yarn.lock` files.
-* `tools/update-prod-static`.  This process is discussed in detail in
+- `tools/update-prod-static`. This process is discussed in detail in
   the [static asset pipeline](../subsystems/html-css.html#static-asset-pipeline)
   article, but we don't use the `node_modules` directories directly in
-  production.  Instead, static assets are compiled using our static
+  production. Instead, static assets are compiled using our static
   asset pipeline and it is the compiled assets that are served
-  directly to users.  As a result, we don't ship the `node_modules`
+  directly to users. As a result, we don't ship the `node_modules`
   directory in a Zulip production release tarball, which is a good
   thing, because doing so would more than double the size of a Zulip
   release tarball.
-* **Checked-in packages**.  In contrast with Python, we have a few
+- **Checked-in packages**. In contrast with Python, we have a few
   JavaScript dependencies that we have copied into the main Zulip
-  repository under `static/third`, often with patches.  These date
-  from an era before `npm` existed.  It is a project goal to eliminate
+  repository under `static/third`, often with patches. These date
+  from an era before `npm` existed. It is a project goal to eliminate
   these checked-in versions of dependencies and instead use versions
   managed by the npm repositories.
 
@@ -248,13 +249,13 @@ its version) and `scripts/lib/third/install-yarn.sh` (the standard
 installer for `yarn`, modified to support installing to a path that is
 not the current user's home directory).
 
-* `nvm` has its own system for installing each version of `node` at
-its own path, which we use, though we install a `/usr/local/bin/node`
-wrapper to access the desired version conveniently and efficiently
-(`nvm` has a lot of startup overhead).
-* `install-yarn.sh` is configured to install `yarn` at
-`/srv/zulip-yarn`.  We don't do anything special to try to manage
-multiple versions of `yarn`.
+- `nvm` has its own system for installing each version of `node` at
+  its own path, which we use, though we install a `/usr/local/bin/node`
+  wrapper to access the desired version conveniently and efficiently
+  (`nvm` has a lot of startup overhead).
+- `install-yarn.sh` is configured to install `yarn` at
+  `/srv/zulip-yarn`. We don't do anything special to try to manage
+  multiple versions of `yarn`.
 
 ## Other third-party and generated files
 
@@ -266,9 +267,9 @@ maintain them.
 ### Emoji
 
 Zulip uses the [iamcal emoji data package][iamcal] for its emoji data
-and sprite sheets.  We download this dependency using `npm`, and then
+and sprite sheets. We download this dependency using `npm`, and then
 have a tool, `tools/setup/build_emoji`, which reformats the emoji data
-into the files under `static/generated/emoji`.  Those files are in
+into the files under `static/generated/emoji`. Those files are in
 turn used by our [Markdown processor](../subsystems/markdown.md) and
 `tools/update-prod-static` to make Zulip's emoji work in the various
 environments where they need to be displayed.
@@ -277,9 +278,9 @@ Since processing emoji is a relatively expensive operation, as part of
 optimizing provisioning, we use the same caching strategy for the
 compiled emoji data as we use for virtualenvs and `node_modules`
 directories, with `scripts/lib/clean_emoji_cache.py` responsible for
-garbage-collection.  This caching and garbage-collection is required
+garbage-collection. This caching and garbage-collection is required
 because a correct emoji implementation involves over 1000 small image
-files and a few large ones.  There is a more extended article on our
+files and a few large ones. There is a more extended article on our
 [emoji infrastructure](emoji.md).
 
 ### Translations data
@@ -287,7 +288,7 @@ files and a few large ones.  There is a more extended article on our
 Zulip's [translations infrastructure](../translating/translating.md) generates
 several files from the source data, which we manage similar to our
 emoji, but without the caching (and thus without the
-garbage-collection).  New translations data is downloaded from
+garbage-collection). New translations data is downloaded from
 Transifex and then compiled to generate both the production locale
 files and also language data in `locale/language*.json` using
 `manage.py compilemessages`, which extends the default Django
@@ -296,7 +297,7 @@ implementation of that tool.
 ### Pygments data
 
 The list of languages supported by our Markdown syntax highlighting
-comes from the [pygments][] package.  `tools/setup/build_pygments_data` is
+comes from the [pygments][] package. `tools/setup/build_pygments_data` is
 responsible for generating `static/generated/pygments_data.json` so that
 our JavaScript Markdown processor has access to the supported list.
 
@@ -305,16 +306,16 @@ our JavaScript Markdown processor has access to the supported list.
 When making changes to Zulip's provisioning process or dependencies,
 usually one needs to think about making changes in 3 places:
 
-* `tools/lib/provision.py`.  This is the main provisioning script,
+- `tools/lib/provision.py`. This is the main provisioning script,
   used by most developers to maintain their development environment.
-* `docs/development/dev-setup-non-vagrant.md`.  This is our "manual installation"
-  documentation.  Strategically, we'd like to move the support for more
+- `docs/development/dev-setup-non-vagrant.md`. This is our "manual installation"
+  documentation. Strategically, we'd like to move the support for more
   versions of Linux from here into `tools/lib/provision.py`.
-* Production.  Our tools for compiling/generating static assets need
+- Production. Our tools for compiling/generating static assets need
   to be called from `tools/update-prod-static`, which is called by
   `tools/build-release-tarball` (for doing Zulip releases) as well as
   `tools/upgrade-zulip-from-git` (for deploying a Zulip server off of
-  master).
+  `main`).
 
 [virtualenv]: https://virtualenv.pypa.io/en/stable/
 [virtualenv-clone]: https://github.com/edwardgeorge/virtualenv-clone/

docs/subsystems/django-upgrades.md

@@ -1,32 +1,32 @@
 # Upgrading Django
 
 This article documents notes on the process for upgrading Zulip to
-new major versions of Django.  Here are the steps:
+new major versions of Django. Here are the steps:
 
-* Carefully read the Django upstream changelog, and `git grep` to
+- Carefully read the Django upstream changelog, and `git grep` to
   check if we're using anything deprecated or significantly modified
   and put them in an issue (and then starting working through them).
   Also, note any new features we might want to use after the upgrade,
   and open an issue listing them;
   [example](https://github.com/zulip/zulip/issues/2564).
-* Start submitting PRs to do any deprecation-type migrations that work
-  on both the old and new version of Django.  The goal here is to have
+- Start submitting PRs to do any deprecation-type migrations that work
+  on both the old and new version of Django. The goal here is to have
   the actual cutover commit be as small as possible, and to test as
   much of the changes for the migration as we can independently from
   the big cutover.
-* Check the version support of the third-party Django packages we use
+- Check the version support of the third-party Django packages we use
   (`git grep django requirements/` to see a list), upgrade any as
-  needed and file bugs upstream for any that lack support.  Look into
+  needed and file bugs upstream for any that lack support. Look into
   fixing said bugs.
-* Look at the pieces of Django code that we've copied and then
+- Look at the pieces of Django code that we've copied and then
   adapted, and confirm whether Django has any updates to the modified
-  code we should apply.  Partial list:
-  * `CursorDebugWrapper`, which we have a modified version of in
-    `zerver/lib/db.py`.  See
+  code we should apply. Partial list:
+  - `CursorDebugWrapper`, which we have a modified version of in
+    `zerver/lib/db.py`. See
     [the issue for contributing this upstream](https://github.com/zulip/zulip/issues/974)
-  * `PasswordResetForm` and any other forms we import from
+  - `PasswordResetForm` and any other forms we import from
     `django.contrib.auth.forms` in `zerver/forms.py` (which has all of
     our Django forms).
-  * Our AsyncDjangoHandler class has some code copied from the core
+  - Our AsyncDjangoHandler class has some code copied from the core
     Django handlers code; look at whether that code was changed in
     Django upstream.

docs/subsystems/email.md

@@ -11,32 +11,33 @@ our instructions for
 On to the documentation. Zulip's email system is fairly straightforward,
 with only a few things you need to know to get started.
 
-* All email templates are in `templates/zerver/emails/`. Each email has three
+- All email templates are in `templates/zerver/emails/`. Each email has three
   template files: `<template_prefix>.subject.txt`, `<template_prefix>.txt`, and
   `<template_prefix>.source.html`. Email templates, along with all other templates
   in the `templates/` directory, are Jinja2 templates.
-* Most of the CSS and HTML layout for emails is in `email_base.html`. Note
+- Most of the CSS and HTML layout for emails is in `email_base.html`. Note
   that email has to ship with all of its CSS and HTML, so nothing in
   `static/` is useful for an email. If you're adding new CSS or HTML for an
   email, there's a decent chance it should go in `email_base.html`.
-* All email is eventually sent by `zerver.lib.send_email.send_email`. There
+- All email is eventually sent by `zerver.lib.send_email.send_email`. There
   are several other functions in `zerver.lib.send_email`, but all of them
   eventually call the `send_email` function. The most interesting one is
   `send_future_email`. The `ScheduledEmail` entries are eventually processed
   by a supervisor job that runs `zerver/management/commands/deliver_scheduled_emails.py`.
-* Always use `user_profile.delivery_email`, not `user_profile.email`,
-  when passing data into the `send_email` library.  The
+- Always use `user_profile.delivery_email`, not `user_profile.email`,
+  when passing data into the `send_email` library. The
   `user_profile.email` field may not always be valid.
-* A good way to find a bunch of example email pathways is to `git grep` for
+- A good way to find a bunch of example email pathways is to `git grep` for
   `zerver/emails` in the `zerver/` directory.
 
 One slightly complicated decision you may have to make when adding an email
 is figuring out how to schedule it. There are 3 ways to schedule email.
-* Send it immediately, in the current Django process, e.g. by calling
+
+- Send it immediately, in the current Django process, e.g. by calling
   `send_email` directly. An example of this is the `confirm_registration`
   email.
-* Add it to a queue. An example is the `invitation` email.
-* Send it (approximately) at a specified time in the future, using
+- Add it to a queue. An example is the `invitation` email.
+- Send it (approximately) at a specified time in the future, using
   `send_future_email`. An example is the `followup_day2` email.
 
 Email takes about a quarter second per email to process and send. Generally
@@ -48,15 +49,15 @@ from a queue. Documentation on our queueing system is available
 ## Development and testing
 
 All the emails sent in the development environment can be accessed by
-visiting `/emails` in the browser.  The way that this works is that
+visiting `/emails` in the browser. The way that this works is that
 we've set the email backend (aka what happens when you call the email
 `.send()` method in Django) in the development environment to be our
-custom backend, `EmailLogBackEnd`.  It does the following:
+custom backend, `EmailLogBackEnd`. It does the following:
 
-* Logs any sent emails to `var/log/email_content.log`. This log is
+- Logs any sent emails to `var/log/email_content.log`. This log is
   displayed by the `/emails` endpoint
   (e.g. http://zulip.zulipdev.com:9991/emails).
-* Print a friendly message on console advertising `/emails` to make
+- Print a friendly message on console advertising `/emails` to make
   this nice and discoverable.
 
 ### Testing in a real email client
@@ -65,7 +66,7 @@ You can also forward all the emails sent in the development
 environment to an email account of your choice by clicking on
 **Forward emails to an email account** on the `/emails` page. This
 feature can be used for testing how the emails gets rendered by
-actual email clients.  This is important because web email clients
+actual email clients. This is important because web email clients
 have limited CSS functionality, autolinkify things, and otherwise
 mutate the HTML email one can see previewed on `/emails`.
 
@@ -81,16 +82,16 @@ Once you have the login credentials of the SMTP provider, since there
 is not `/etc/zulip/settings.py` in development, configure it using the
 following keys in `zproject/dev-secrets.conf`
 
-* `email_host` - SMTP hostname.
-* `email_port` - SMTP port.
-* `email_host_user` - Username of the SMTP user
-* `email_password` - Password of the SMTP user.
-* `email_use_tls` - Set to `true` for most providers. Else, don't set any value.
+- `email_host` - SMTP hostname.
+- `email_port` - SMTP port.
+- `email_host_user` - Username of the SMTP user
+- `email_password` - Password of the SMTP user.
+- `email_use_tls` - Set to `true` for most providers. Else, don't set any value.
 
 Here is an example of how `zproject/dev-secrets.conf` might look if
 you are using Gmail.
 
-```
+```ini
 email_host = smtp.gmail.com
 email_port = 587
 email_host_user = username@gmail.com
@@ -103,18 +104,18 @@ email_password = gmail_password
 
 ### Notes
 
-* After changing any HTML email or `email_base.html`, you need to run
+- After changing any HTML email or `email_base.html`, you need to run
   `scripts/setup/inline_email_css.py` for the changes to be reflected
   in the development environment. The script generates files like
   `templates/zerver/emails/compiled/<template_prefix>.html`.
 
-* Images won't be displayed in a real email client unless you change
+- Images won't be displayed in a real email client unless you change
   the `base_image_uri` used for emails to a public URL such as
   `https://chat.zulip.org/static/images/emails` (image links to
   `localhost:9991` aren't allowed by modern email providers). See
   `zproject/email_backends.py` for more details.
 
-* While running the backend test suite, we use
+- While running the backend test suite, we use
   `django.core.mail.backends.locmem.EmailBackend` as the email
   backend. The `locmem` backend stores messages in a special attribute
   of the django.core.mail module, "outbox". The outbox attribute is
@@ -123,18 +124,18 @@ email_password = gmail_password
 
 ## Email templates
 
-Zulip's email templates live under `templates/zerver/emails`.  Email
+Zulip's email templates live under `templates/zerver/emails`. Email
 templates are a messy problem, because on the one hand, you want nice,
 readable markup and styling, but on the other, email clients have very
 limited CSS support and generally require us to inject any CSS we're
-using in the emails into the email as inline styles.  And then you
-also need both plain-text and HTML emails.  We solve these problems
+using in the emails into the email as inline styles. And then you
+also need both plain-text and HTML emails. We solve these problems
 using a combination of the
 [premailer](https://github.com/peterbe/premailer) library and having
 two copies of each email (plain-text and HTML).
 
 So for each email, there are two source templates: the `.txt` version
-(for plain-text format) as well as a `.source.html` template.  The
+(for plain-text format) as well as a `.source.html` template. The
 `.txt` version is used directly; while the `.source.html` template is
 processed by `scripts/setup/inline_email_css.py` (generating a `.html` template
 under `templates/zerver/emails/compiled`); that tool (powered by
@@ -143,19 +144,19 @@ under `templates/zerver/emails/compiled`); that tool (powered by
 
 What this means is that when you're editing emails, **you need to run
 `scripts/setup/inline_email_css.py`** after making changes to see the changes
-take effect.  Our tooling automatically runs this as part of
+take effect. Our tooling automatically runs this as part of
 `tools/provision` and production deployments; but you should bump
 `PROVISION_VERSION` when making changes to emails that change test
 behavior, or other developers will get test failures until they
 provision.
 
 While this model is great for the markup side, it isn't ideal for
-[translations](../translating/translating.md).  The Django
+[translations](../translating/translating.md). The Django
 translation system works with exact strings, and having different new
 markup can require translators to re-translate strings, which can
 result in problems like needing 2 copies of each string (one for
 plain-text, one for HTML) and/or needing to re-translate a bunch of
-strings after making a CSS tweak.  Re-translating these strings is
+strings after making a CSS tweak. Re-translating these strings is
 relatively easy in Transifex, but annoying.
 
 So when writing email templates, we try to translate individual

docs/subsystems/emoji.md

@@ -1,28 +1,28 @@
 # Emoji
 
 Emoji seem like a simple idea, but there's actually a ton of
-complexity that goes into an effective emoji implementation.  This
+complexity that goes into an effective emoji implementation. This
 document discusses a number of these issues.
 
 Currently, Zulip supports these four display formats for emoji:
 
-* Google modern
-* Google classic
-* Twitter
-* Plain text
+- Google modern
+- Google classic
+- Twitter
+- Plain text
 
 ## Emoji codes
 
 The Unicode standard has various ranges of characters set aside for
-emoji.  So you can put emoji in your terminal using actual Unicode
-characters like 😀  and 👍.  If you paste those into Zulip, Zulip will
+emoji. So you can put emoji in your terminal using actual Unicode
+characters like 😀 and 👍. If you paste those into Zulip, Zulip will
 render them as the corresponding emoji image.
 
 However, the Unicode committee did not standardize on a set of
-human-readable names for emoji.  So, for example, when using the
+human-readable names for emoji. So, for example, when using the
 popular `:` based style for entering emoji from the keyboard, we have
 to decide whether to use `:angry:` or `:angry_face:` to represent an
-angry face.  Different products use different approaches, but for
+angry face. Different products use different approaches, but for
 purposes like emoji pickers or autocomplete, you definitely want to
 pick exactly one of these names, since otherwise users will always be
 seeing duplicates of a given emoji next to each other.
@@ -32,9 +32,9 @@ section on [picking emoji names](#picking-emoji-names) below.
 
 ### Custom emoji
 
-Zulip supports custom user-uploaded emoji.  We manage those by having
+Zulip supports custom user-uploaded emoji. We manage those by having
 the name of the emoji be its "emoji code", and using an emoji_type
-field to keep track of it.  We are in the progress of migrating Zulip
+field to keep track of it. We are in the progress of migrating Zulip
 to refer to these emoji only by ID, which is a requirement for being
 able to support deprecating old realm emoji in a sensible way.
 
@@ -42,17 +42,17 @@ able to support deprecating old realm emoji in a sensible way.
 
 We use the [iamcal emoji data package][iamcal] to provide sprite
 sheets and individual images for our emoji, as well as a data set of
-emoji categories, code points, etc.  The sprite sheets are used
+emoji categories, code points, etc. The sprite sheets are used
 by the Zulip webapp to display emoji in messages, emoji reactions,
-etc.  However, we can't use the sprite sheets in some contexts, such
+etc. However, we can't use the sprite sheets in some contexts, such
 as missed-message and digest emails, that need to have self-contained
-assets.  For those, we use individual emoji files under
-`static/generated/emoji`.  The structure of that repository contains
+assets. For those, we use individual emoji files under
+`static/generated/emoji`. The structure of that repository contains
 both files named after the Unicode representation of emoji (as actual
 image files) as well as symlinks pointing to those emoji.
 
 We need to maintain those both for the names used in the iamcal emoji
-data set as well as our old emoji data set (`emoji_map.json`).  Zulip
+data set as well as our old emoji data set (`emoji_map.json`). Zulip
 has a tool, `tools/setup/emoji/build_emoji`, that combines the
 `emoji.json` file from iamcal with the old `emoji_map.json` data set
 to construct the various symlink farms and output files described
@@ -64,30 +64,31 @@ The `build_emoji` tool generates the set of files under
 `static/generated/emoji` is a symlink to that tree; we do this in
 order to cache old versions to make provisioning and production
 deployments super fast in the common case that we haven't changed the
-emoji tooling).  See [our dependencies document](../subsystems/dependencies.md)
+emoji tooling). See [our dependencies document](../subsystems/dependencies.md)
 for more details on this strategy.
 
 The emoji tree generated by this process contains several import elements:
-* `emoji_codes.json`: A set of mappings used by the Zulip frontend to
+
+- `emoji_codes.json`: A set of mappings used by the Zulip frontend to
   understand what Unicode emoji exist and what their shortnames are,
-  used for autocomplete, emoji pickers, etc.  This has been
+  used for autocomplete, emoji pickers, etc. This has been
   deduplicated using the logic in
   `tools/setup/emoji/emoji_setup_utils.py` to generally only have
   `:angry:` and not also `:angry_face:`, since having both is ugly and
   pointless for purposes like autocomplete and emoji pickers.
-* `images/emoji/unicode/*.png`: A farm of emoji
-* `images/emoji/*.png`: A farm of symlinks from emoji names to the
-  `images/emoji/unicode/` tree.  This is used to serve individual emoji
+- `images/emoji/unicode/*.png`: A farm of emoji
+- `images/emoji/*.png`: A farm of symlinks from emoji names to the
+  `images/emoji/unicode/` tree. This is used to serve individual emoji
   images, as well as for the
   [backend Markdown processor](../subsystems/markdown.md) to know which emoji
-  names exist and what Unicode emoji / images they map to.  In this
+  names exist and what Unicode emoji / images they map to. In this
   tree, we currently include all of the emoji in `emoji-map.json`;
   this means that if you send `:angry_face:`, it won't autocomplete,
   but will still work (but not in previews).
-* Some CSS and PNGs for the emoji spritesheets, used in Zulip for
+- Some CSS and PNGs for the emoji spritesheets, used in Zulip for
   emoji pickers where we would otherwise need to download over 1000 of
   individual emoji images (which would cause a browser performance
-  problem).  We have multiple spritesheets: one for each emoji
+  problem). We have multiple spritesheets: one for each emoji
   provider that we support (Google, Twitter, EmojiOne, and Apple.).
 
 [iamcal]: https://github.com/iamcal/emoji-data
@@ -102,36 +103,36 @@ The following set of considerations is not comprehensive, but has a few
 principles that were applied to the current set of names. We use (strong),
 (medium), and (weak) denote how strong a consideration it is.
 
-* Even with over 1000 symbols, emoji feels surprisingly sparse as a language,
+- Even with over 1000 symbols, emoji feels surprisingly sparse as a language,
   and more often than not, if you search for something, you don't find an
   appropriate emoji for it. So a primary goal for our set of names is to
   maximize the number of situations in which the user finds an emoji that
   feels appropriate. (strong)
 
-* Conversely, we remove generic words that will gum up the typeahead. So
+- Conversely, we remove generic words that will gum up the typeahead. So
   `:outbox:` instead of `:outbox_tray:`. Each word should count. (medium)
 
-* We aim for the set of names to be as widely culturally applicable as
+- We aim for the set of names to be as widely culturally applicable as
   possible, even if the glyphs are not. So `:statue:` instead of
   `:new_york:` for the statue of liberty, and `:tower:` instead of
   `:tokyo_tower:`. (strong)
 
-* We remove unnecessary gender descriptions. So `:ok_signal:` instead of
+- We remove unnecessary gender descriptions. So `:ok_signal:` instead of
   `:ok_woman:`. (strong)
 
-* We don't add names that could be inappropriate in school or work
+- We don't add names that could be inappropriate in school or work
   environments, even if the use is common on the internet. For example, we
   have not added `:butt:` for `:peach:`, or `:cheers:` for
   `:beers:`. (strong)
 
-* Names should be compatible with the four emoji sets we support, but don't
+- Names should be compatible with the four emoji sets we support, but don't
   have to be compatible with any other emoji set. (medium)
 
-* We try not to use a creative canonical_name for emoji that are likely to
+- We try not to use a creative canonical_name for emoji that are likely to
   be familiar to a large subset of users. This largely applies to certain
   faces. (medium)
 
-* The set of names should be compatible with the iamcal, gemoji, and Unicode
+- The set of names should be compatible with the iamcal, gemoji, and Unicode
   names. Compatible here means that if there is an emoji name a user knows
   from one of those sets, and the user searches for the key word of that
   name, they will get an emoji in our set. It is okay if this emoji has a
@@ -142,26 +143,26 @@ Much of the work of picking names went into the first bullet above: making
 the emoji language less sparse. Some tricks and heuristics that were used
 for that:
 
-* There are many near duplicates, like `:dog:` and `:dog_face:`, or
+- There are many near duplicates, like `:dog:` and `:dog_face:`, or
   `:mailbox:`, `:mailbox_with_mail:`, and `:mailbox_with_no_mail:`. In these
   cases we repurpose the duplicates to be as useful as we can, like `:dog:`
   and `:puppy:`, and `:mailbox:`, `:unread_mail:`, `:inbox_zero:` for the
   ones above. There isn't a ton of flexibility, since we can't change the
   glyphs. But in most cases we have been able to come up with something.
 
-* Many emoji have commonly understood meanings among people that use emoji a
+- Many emoji have commonly understood meanings among people that use emoji a
   lot, and there are websites and articles that document some of these
   meanings. A commonly understood meaning can be a great thing to add as an
   alternate name, since often it is a sign that the meaning is addressing a
   real gap in the emoji system.
 
-* Many emoji names are unnecessarily specific in iamcal/etc, like
+- Many emoji names are unnecessarily specific in iamcal/etc, like
   `:flower_playing_cards:`, `:izakaya_lantern:`, or `:amphora:`. Renaming
   them to `:playing_cards:`, `:lantern:`, and `:vase:` makes them more
   widely usable. In such cases we often keep the specific name as an
   alternate.
 
-* If there are natural things someone might type, like `:happy:`, we try to
+- If there are natural things someone might type, like `:happy:`, we try to
   find an emoji to match. This extends to things that someone might not
   think to type, but as soon as someone in the organization discovers it it
   could get wide use, like `:working_on_it:`. Good future work would be to
@@ -171,7 +172,7 @@ for that:
 
 Other notes
 
-* Occasionally there are near duplicates where we don't have ideas for
+- Occasionally there are near duplicates where we don't have ideas for
   useful names for the second one. In that case we sometimes remove the
   emoji rather than have two nearly identical glyphs in the emoji picker and
   typeahead. For instance, we kept `:spiral_notepad:` and dropped
@@ -179,7 +180,7 @@ Other notes
   of glyphs look very different, we'll find two names that allow them both
   to stay.
 
-* We removed many of the moons and clocks, to make the typeahead experience
+- We removed many of the moons and clocks, to make the typeahead experience
   better when searching for something that catches all the moons or all the
   clocks. We kept all the squares and diamonds and other shapes, even though
   they have the same problem, since they are commonly used to make emoji art

docs/subsystems/events-system.md

@@ -1,7 +1,7 @@
 # Real-time push and events
 
 Zulip's "events system" is the server-to-client push system that
-powers our real-time sync.  This document explains how it works; to
+powers our real-time sync. This document explains how it works; to
 read an example of how a complete feature using this system works,
 check out the
 [new application feature tutorial](../tutorials/new-feature-tutorial.md).
@@ -9,23 +9,23 @@ check out the
 Any single-page web application like Zulip needs a story for how
 changes made by one client are synced to other clients, though having
 a good architecture for this is particularly important for a chat tool
-like Zulip, since the state is constantly changing.  When we talk
+like Zulip, since the state is constantly changing. When we talk
 about clients, think a browser tab, mobile app, or API bot that needs
-to receive updates to the Zulip data.  The simplest example is a new
+to receive updates to the Zulip data. The simplest example is a new
 message being sent by one client; other clients must be notified in
-order to display the message.  But a complete application like Zulip
+order to display the message. But a complete application like Zulip
 has dozens of different types of data that need to be synced to other
 clients, whether it be new streams, changes in a user's name or
-avatar, settings changes, etc.  In Zulip, we call these updates that
+avatar, settings changes, etc. In Zulip, we call these updates that
 need to be sent to other clients **events**.
 
 An important thing to understand when designing such a system is that
 events need to be synced to every client that has a copy of the old
 data if one wants to avoid clients displaying inaccurate data to
-users.  So if a user has two browser windows open and sends a message,
+users. So if a user has two browser windows open and sends a message,
 every client controlled by that user as well as any recipients of the
 message, including both of those two browser windows, will receive
-that event.  (Technically, we don't need to send events to the client
+that event. (Technically, we don't need to send events to the client
 that triggered the change, but this approach saves a bunch of
 unnecessary duplicate UI update code, since the client making the
 change can just use the same code as every other client, maybe plus a
@@ -34,11 +34,11 @@ little notification that the operation succeeded).
 Architecturally, there are a few things needed to make a successful
 real-time sync system work:
 
-* **Generation**.  Generating events when changes happen to data, and
+- **Generation**. Generating events when changes happen to data, and
   determining which users should receive each event.
-* **Delivery**.  Efficiently delivering those events to interested
+- **Delivery**. Efficiently delivering those events to interested
   clients, ideally in an exactly-once fashion.
-* **UI updates**.  Updating the UI in the client once it has received
+- **UI updates**. Updating the UI in the client once it has received
   events from the server.
 
 Reactive JavaScript libraries like React and Vue can help simplify the
@@ -51,30 +51,30 @@ problems in a scalable, correct, and predictable way.
 ## Generation system
 
 Zulip's generation system is built around a Python function,
-`send_event(realm, event, users)`.  It accepts the realm (used for
+`send_event(realm, event, users)`. It accepts the realm (used for
 sharding), the event data structure (just a Python dictionary with
 some keys and value; `type` is always one of the keys but the rest
 depends on the specific event) and a list of user IDs for the users
-whose clients should receive the event.  In special cases such as
+whose clients should receive the event. In special cases such as
 message delivery, the list of users will instead be a list of dicts
 mapping user IDs to user-specific data like whether that user was
-mentioned in that message.  The data passed to `send_event` are simply
+mentioned in that message. The data passed to `send_event` are simply
 marshalled as JSON and placed in the `notify_tornado` RabbitMQ queue
 to be consumed by the delivery system.
 
 Usually, this list of users is one of 3 things:
 
-* A single user (e.g. for user-level settings changes).
-* Everyone in the realm (e.g. for organization-level settings changes,
+- A single user (e.g. for user-level settings changes).
+- Everyone in the realm (e.g. for organization-level settings changes,
   like new realm emoji).
-* Everyone who would receive a given message (for messages, emoji
+- Everyone who would receive a given message (for messages, emoji
   reactions, message editing, etc.); i.e. the subscribers to a stream
   or the people on a private message thread.
 
 It is the responsibility of the caller of `send_event` to choose the
-list of user IDs correctly.  There can be security problems if e.g. an
+list of user IDs correctly. There can be security problems if e.g. an
 event containing private message content is sent to the entire
-organization.  However, if an event isn't sent to enough clients,
+organization. However, if an event isn't sent to enough clients,
 there will likely be user-visible real-time sync bugs.
 
 Most of the hard work in event generation is about defining consistent
@@ -84,7 +84,7 @@ wide range of possible clients, and make it easy for developers.
 ## Delivery system
 
 Zulip's event delivery (real-time push) system is based on Tornado,
-which is ideal for handling a large number of open requests.  Details
+which is ideal for handling a large number of open requests. Details
 on Tornado are available in the
 [architecture overview](../overview/architecture-overview.md), but in short it
 is good at holding open a large number of connections for a long time.
@@ -94,7 +94,7 @@ primarily `zerver/tornado/event_queue.py`.
 Zulip's event delivery system is based on "long-polling"; basically
 clients make `GET /json/events` calls to the server, and the server
 doesn't respond to the request until it has an event to deliver to the
-client.  This approach is reasonably efficient and works everywhere
+client. This approach is reasonably efficient and works everywhere
 (unlike websockets, which have a decreasing but nonzero level of
 client compatibility problems).
 
@@ -103,16 +103,16 @@ For each connected client, the **event queue server** maintains an
 that client which have not yet been acknowledged by that client.
 Ignoring the subtle details around error handling, the protocol is
 pretty simple; when a client does a `GET /json/events` call, the
-server checks if there are any events in the queue.  If there are, it
-returns the events immediately.  If there aren't, it records that
+server checks if there are any events in the queue. If there are, it
+returns the events immediately. If there aren't, it records that
 queue as having a waiting client (often called a `handler` in the
 code).
 
 When it pulls an event off the `notify_tornado` RabbitMQ queue, it
 simply delivers the event to each queue associated with one of the
-target users.  If the queue has a waiting client, it breaks the
+target users. If the queue has a waiting client, it breaks the
 long-poll connection by returning an HTTP response to the waiting
-client request.  If there is no waiting client, it simply pushes the
+client request. If there is no waiting client, it simply pushes the
 event onto the queue.
 
 When starting up, each client makes a `POST /json/register` to the
@@ -120,25 +120,25 @@ server, which creates a new event queue for that client and returns the
 `queue_id` as well as an initial `last_event_id` to the client (it can
 also, optionally, fetch the initial data to save an RTT and avoid
 races; see the below section on initial data fetches for details on
-why this is useful).  Once the event queue is registered, the client
+why this is useful). Once the event queue is registered, the client
 can just do an infinite loop calling `GET /json/events` with those
 parameters, updating `last_event_id` each time to acknowledge any
 events it has received (see `call_on_each_event` in the
 [Zulip Python API bindings][api-bindings-code] for a complete example
-implementation).  When handling each `GET /json/events` request, the
+implementation). When handling each `GET /json/events` request, the
 queue server can safely delete any events that have an event ID less
 than or equal to the client's `last_event_id` (event IDs are just a
 counter for the events a given queue has received.)
 
 If network failures were impossible, the `last_event_id` parameter in
 the protocol would not be required, but it is important for enabling
-exactly-once delivery in the presence of potential failures.  (Without
+exactly-once delivery in the presence of potential failures. (Without
 it, the queue server would have to delete events from the queue as
 soon as it attempted to send them to the client; if that specific HTTP
 response didn't reach the client due to a network TCP failure, then
 those events could be lost).
 
-[api-bindings-code]: https://github.com/zulip/python-zulip-api/blob/master/zulip/zulip/__init__.py
+[api-bindings-code]: https://github.com/zulip/python-zulip-api/blob/main/zulip/zulip/__init__.py
 
 The queue servers are a very high-traffic system, processing at a
 minimum one request for every message delivered to every Zulip client.
@@ -150,13 +150,13 @@ every 45s or so (if no other events have arrived in the meantime).
 To avoid a large memory and other resource leak, the queues are
 garbage collected after (by default) 10 minutes of inactivity from a
 client, under the theory that the client has likely gone off the
-Internet (or no longer exists) access; this happens constantly.  If
+Internet (or no longer exists) access; this happens constantly. If
 the client returns, it will receive a "queue not found" error when
 requesting events; its handler for this case should just restart the
 client / reload the browser so that it refetches initial data the same
-way it would on startup.  Since clients have to implement their
+way it would on startup. Since clients have to implement their
 startup process anyway, this approach adds minimal technical
-complexity to clients.  A nice side effect is that if the event queue
+complexity to clients. A nice side effect is that if the event queue
 server (which stores queues in memory) were to crash and lose
 its data, clients would recover, just as if they had lost Internet
 access briefly (there is some DoS risk to manage, though).
@@ -175,10 +175,10 @@ anyway).
 When a client starts up, it usually wants to get 2 things from the
 server:
 
-* The "current state" of various pieces of data, e.g. the current
+- The "current state" of various pieces of data, e.g. the current
   settings, set of users in the organization (for typeahead), stream,
   messages, etc. (aka the "initial state").
-* A subscription to receive updates to those data when they are
+- A subscription to receive updates to those data when they are
   changed by a client (aka an event queue).
 
 Ideally, one would get those two things atomically, i.e. if some other
@@ -197,31 +197,31 @@ This is quite challenging to do technically, because fetching the
 initial state for a complex web application like Zulip might involve
 dozens of queries to the database, caches, etc. over the course of
 100ms or more, and it is thus nearly impossible to do all of those
-things together atomically.  So instead, we use a more complicated
+things together atomically. So instead, we use a more complicated
 algorithm that can produce the atomic result from non-atomic
-subroutines.  Here's how it works when you make a `register` API
+subroutines. Here's how it works when you make a `register` API
 request; the logic is in `zerver/views/events_register.py` and
-`zerver/lib/events.py`.  The request is directly handled by Django:
+`zerver/lib/events.py`. The request is directly handled by Django:
 
-* Django makes an HTTP request to Tornado, requesting that a new event
+- Django makes an HTTP request to Tornado, requesting that a new event
   queue be created, and records its queue ID.
-* Django does all the various database/cache/etc. queries to fetch the
+- Django does all the various database/cache/etc. queries to fetch the
   data, non-atomically, from the various data sources (see
   the `fetch_initial_state_data` function).
-* Django makes a second HTTP request to Tornado, requesting any events
+- Django makes a second HTTP request to Tornado, requesting any events
   that had been added to the Tornado event queue since it
   was created.
-* Finally, Django "applies" the events (see the `apply_events`
-  function) to the initial state that it fetched.  E.g. for a name
+- Finally, Django "applies" the events (see the `apply_events`
+  function) to the initial state that it fetched. E.g. for a name
   change event, it finds the user data in the `realm_user` data
   structure, and updates it to have the new name.
 
 ### Testing
 
 The design above achieves everything we desire, at the cost that we need to
-write a correct `apply_events` function.  This is a difficult function to
+write a correct `apply_events` function. This is a difficult function to
 implement correctly, because the situations that it handles almost never
-happen (being race conditions) during manual testing.  Fortunately, we have
+happen (being race conditions) during manual testing. Fortunately, we have
 a protocol for testing `apply_events` in our automated backend tests.
 
 #### Overview
@@ -233,19 +233,21 @@ ready to write a test in `test_events.py`.
 
 The actual code for a `test_events` test can be quite concise:
 
-    def test_default_streams_events(self) -> None:
-        stream = get_stream("Scotland", self.user_profile.realm)
-        events = self.verify_action(lambda: do_add_default_stream(stream))
-        check_default_streams("events[0]", events[0])
-        # (some details omitted)
+```python
+def test_default_streams_events(self) -> None:
+    stream = get_stream("Scotland", self.user_profile.realm)
+    events = self.verify_action(lambda: do_add_default_stream(stream))
+    check_default_streams("events[0]", events[0])
+    # (some details omitted)
+```
 
 The real trick is debugging these tests.
 
 The test example above has three things going on:
 
-* Set up some data (`get_stream`)
-* Call `verify_action` with an action function (`do_add_default_stream`)
-* Use a schema checker to validate data (`check_default_streams`)
+- Set up some data (`get_stream`)
+- Call `verify_action` with an action function (`do_add_default_stream`)
+- Use a schema checker to validate data (`check_default_streams`)
 
 #### verify_action
 
@@ -255,7 +257,7 @@ within `test_events.py`.
 
 The `verify_action` function simulates the possible race condition in
 order to verify that the `apply_events` logic works correctly in the
-context of some action function.  To use our concrete example above,
+context of some action function. To use our concrete example above,
 we are seeing that applying the events from the
 `do_remove_default_stream` action inside of `apply_events` to a stale
 copy of your state results in the same state dictionary as doing the
@@ -263,15 +265,15 @@ action and then fetching a fresh copy of the state.
 
 In particular, `verify_action` does the following:
 
-* Call `fetch_initial_state_data` to get the current state.
-* Call the action function (e.g. `do_add_default_stream`).
-* Capture the events generated by the action function.
-* Check the events generated are documented in the [OpenAPI
+- Call `fetch_initial_state_data` to get the current state.
+- Call the action function (e.g. `do_add_default_stream`).
+- Capture the events generated by the action function.
+- Check the events generated are documented in the [OpenAPI
   schema](../documentation/api.md) defined in
   `zerver/openapi/zulip.yaml`.
-* Call `apply_events(state, events)`, to get the resulting "hybrid state".
-* Call `fetch_initial_state_data` again to get the "normal state".
-* Compare the two results.
+- Call `apply_events(state, events)`, to get the resulting "hybrid state".
+- Call `fetch_initial_state_data` again to get the "normal state".
+- Compare the two results.
 
 In the event that you wrote the `apply_events` logic correctly the
 first time, then the two states will be identical, and the
@@ -288,75 +290,81 @@ behind the `apply_events` function. It may also be helpful to read the code
 for `verify_action` itself. Finally, you may want to ask for help on chat.
 
 Before we move on to the next step, it's worth noting that `verify_action`
-only has one required parameter, which is the action function.  We
+only has one required parameter, which is the action function. We
 typically express the action function as a lambda, so that we
 can pass in arguments:
 
-    events = self.verify_action(lambda: do_add_default_stream(stream))
+```python
+events = self.verify_action(lambda: do_add_default_stream(stream))
+```
 
 There are some notable optional parameters for `verify_action`:
 
-    * `state_change_expected` must be set to `False` if your action
-      doesn't actually require state changes for some reason; otherwise,
-      `verify_action` will complain that your test doesn't really
-      exercise any `apply_events` logic.  Typing notifications (which
-      are ephemereal) are a common place where we use this.
+- `state_change_expected` must be set to `False` if your action
+  doesn't actually require state changes for some reason; otherwise,
+  `verify_action` will complain that your test doesn't really
+  exercise any `apply_events` logic. Typing notifications (which
+  are ephemereal) are a common place where we use this.
 
-    * `num_events` will tell `verify_action` how many events the
-      `hamlet` user will receive after the action (the default is 1).
+- `num_events` will tell `verify_action` how many events the
+  `hamlet` user will receive after the action (the default is 1).
 
-    * parameters such as `client_gravatar` and `slim_presence` get
-      passed along to `fetch_initial_state_data` (and it's important
-      to test both boolean values of these parameters for relevant
-      actions).
+- parameters such as `client_gravatar` and `slim_presence` get
+  passed along to `fetch_initial_state_data` (and it's important
+  to test both boolean values of these parameters for relevant
+  actions).
 
 For advanced use cases of `verify_action`, we highly recommend reading
 the code itself in `BaseAction` (in `test_events.py`).
 
 #### Schema checking
 
-The `test_events.py` system has two forms of schema checking.  The
+The `test_events.py` system has two forms of schema checking. The
 first is verifying that you've updated the [GET /events API
 documentation](https://zulip.com/api/get-events) to document your new
 event's format for benefit of the developers of Zulip's mobile app,
-terminal app, and other API clients.  See the [API documentation
+terminal app, and other API clients. See the [API documentation
 docs](../documentation/api.md) for details on the OpenAPI
 documentation.
 
 The second is higher-detail check inside `test_events` that this
-specific test generated the expected series of events.  Let's look at
+specific test generated the expected series of events. Let's look at
 the last line of our example test snippet:
 
-    # ...
-    events = self.verify_action(lambda: do_add_default_stream(stream))
-    check_default_streams("events[0]", events[0])
+```python
+# ...
+events = self.verify_action(lambda: do_add_default_stream(stream))
+check_default_streams("events[0]", events[0])
+```
 
 We have discussed `verify_action` in some detail, and you will
 note that it returns the actual events generated by the action
-function.  It is part of our test discipline in `test_events` to
+function. It is part of our test discipline in `test_events` to
 verify that the events are formatted in a predictable way.
 
 Ideally, we would test that events match the exact data that we
 expect, but it can be difficult to do this due to unpredictable
-things like database ids.  So instead, we just verify the "schema"
-of the event(s).  We use a schema checker like `check_default_streams`
+things like database ids. So instead, we just verify the "schema"
+of the event(s). We use a schema checker like `check_default_streams`
 to validate the types of the data.
 
 If you are creating a new event format, then you will have to
-write your own schema checker in `event_schema.py`.  Here is
+write your own schema checker in `event_schema.py`. Here is
 the example relevant to our example:
 
-    default_streams_event = event_dict_type(
-        required_keys=[
-            ("type", Equals("default_streams")),
-            ("default_streams", ListType(DictType(basic_stream_fields))),
-        ]
-    )
-    check_default_streams = make_checker(default_streams_event)
+```python
+default_streams_event = event_dict_type(
+    required_keys=[
+        ("type", Equals("default_streams")),
+        ("default_streams", ListType(DictType(basic_stream_fields))),
+    ]
+)
+check_default_streams = make_checker(default_streams_event)
+```
 
-Note that `basic_stream_fields` is not shown in these docs.  The
+Note that `basic_stream_fields` is not shown in these docs. The
 best way to understand how to write schema checkers is to read
-`event_schema.py`.  There is a large block comment at the top of
+`event_schema.py`. There is a large block comment at the top of
 the file, and then you can skim the rest of the file to see the
 patterns.
 
@@ -378,9 +386,9 @@ against the two versions of the schema that you declared above using
 
 The final detail we need to ensure that `apply_events` always works
 correctly is to make sure that we have relevant tests for
-every event type that can be generated by Zulip.  This can be tested
+every event type that can be generated by Zulip. This can be tested
 manually using `test-backend --coverage BaseAction` and then
-checking that all the calls to `send_event` are covered.  Someday
+checking that all the calls to `send_event` are covered. Someday
 we'll add automation that verifies this directly by inspecting the
 coverage data.
 
@@ -392,11 +400,11 @@ available via the `page_params` parameter.
 ### Messages
 
 One exception to the protocol described in the last section is the
-actual messages.  Because Zulip clients usually fetch them in a
+actual messages. Because Zulip clients usually fetch them in a
 separate AJAX call after the rest of the site is loaded, we don't need
-them to be included in the initial state data.  To handle those
+them to be included in the initial state data. To handle those
 correctly, clients are responsible for discarding events related to
 messages that the client has not yet fetched.
 
 Additionally, see
-[the master documentation on sending messages](../subsystems/sending-messages.md)
+[the main documentation on sending messages](../subsystems/sending-messages.md)

docs/subsystems/full-text-search.md

@@ -1,7 +1,7 @@
 # Full-text search
 
 Zulip supports full-text search, which can be combined arbitrarily
-with Zulip's full suite of narrowing operators.  By default, it only
+with Zulip's full suite of narrowing operators. By default, it only
 supports English text, but there is an experimental
 [PGroonga](https://pgroonga.github.io/) integration that provides
 full-text search for all languages.
@@ -19,7 +19,7 @@ search results.
 
 In order to optimize the performance of delivering messages, the
 full-text search index is updated for newly sent messages in the
-background, after the message has been delivered.  This background
+background, after the message has been delivered. This background
 updating is done by
 `puppet/zulip/files/postgresql/process_fts_updates`, which is usually
 deployed on the database server, but could be deployed on an
@@ -31,7 +31,7 @@ Zulip also supports using [PGroonga](https://pgroonga.github.io/) for
 full-text search. While PostgreSQL's built-in full-text search feature
 supports only one language at a time (in Zulip's case, English), the
 PGroonga full-text search engine supports all languages
-simultaneously, including Japanese and Chinese.  Once we have tested
+simultaneously, including Japanese and Chinese. Once we have tested
 this new backend sufficiently, we expect to switch Zulip deployments
 to always use PGroonga.
 
@@ -41,46 +41,63 @@ All steps in this section should be run as the `root` user; on most installs, th
 
 1. Alter the deployment setting:
 
-        crudini --set /etc/zulip/zulip.conf machine pgroonga enabled
+   ```bash
+   crudini --set /etc/zulip/zulip.conf machine pgroonga enabled
+   ```
 
 1. Update the deployment to respect that new setting:
 
-        /home/zulip/deployments/current/scripts/zulip-puppet-apply
+   ```bash
+   /home/zulip/deployments/current/scripts/zulip-puppet-apply
+   ```
 
 1. Edit `/etc/zulip/settings.py`, to add:
 
-        USING_PGROONGA = True
+   ```python
+   USING_PGROONGA = True
+   ```
 
 1. Apply the PGroonga migrations:
 
-        su zulip -c '/home/zulip/deployments/current/manage.py migrate pgroonga'
+   ```bash
+   su zulip -c '/home/zulip/deployments/current/manage.py migrate pgroonga'
+   ```
 
-    Note that the migration may take a long time, and users will be
-    unable to send new messages until the migration finishes.
+   Note that the migration may take a long time, and users will be
+   unable to send new messages until the migration finishes.
 
 1. Once the migrations are complete, restart Zulip:
 
-        su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
-
+   ```bash
+   su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
+   ```
 
 ### Disabling PGroonga
 
 1. Remove the PGroonga migration:
 
-        su zulip -c '/home/zulip/deployments/current/manage.py migrate pgroonga zero'
+   ```bash
+   su zulip -c '/home/zulip/deployments/current/manage.py migrate pgroonga zero'
+   ```
 
-    If you intend to re-enable PGroonga later, you can skip this step,
-    at the cost of your Message table being slightly larger than it would
-    be otherwise.
+   If you intend to re-enable PGroonga later, you can skip this step,
+   at the cost of your Message table being slightly larger than it would
+   be otherwise.
 
 1. Edit `/etc/zulip/settings.py`, editing the line containing `USING_PGROONGA` to read:
 
-        USING_PGROONGA = False
+   ```python
+   USING_PGROONGA = False
+   ```
 
 1. Restart Zulip:
 
-        su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
+   ```bash
+   su zulip -c '/home/zulip/deployments/current/scripts/restart-server'
+   ```
 
 1. Finally, remove the deployment setting:
 
-        crudini --del /etc/zulip/zulip.conf machine pgroonga
+   ```bash
+   crudini --del /etc/zulip/zulip.conf machine pgroonga
+   ```

docs/subsystems/hashchange-system.md

@@ -7,42 +7,42 @@ be used to deep-link into the application and allow the browser's
 "back" functionality to let the user navigate between parts of the UI.
 Some examples are:
 
-* `/#settings/your-bots`: Bots section of the settings overlay.
-* `/#streams`: Streams overlay, where the user manages streams
+- `/#settings/your-bots`: Bots section of the settings overlay.
+- `/#streams`: Streams overlay, where the user manages streams
   (subscription etc.)
-* `/#streams/11/announce`: Streams overlay with stream ID 11 (called
+- `/#streams/11/announce`: Streams overlay with stream ID 11 (called
   "announce") selected.
-* `/#narrow/stream/42-android/topic/fun`: Message feed showing stream
-  "android" and topic "fun".  (The `42` represents the id of the
-   stream.
+- `/#narrow/stream/42-android/topic/fun`: Message feed showing stream
+  "android" and topic "fun". (The `42` represents the id of the
+  stream.
 
 The main module in the frontend that manages this all is
 `static/js/hashchange.js` (plus `hash_util.js` for all the parsing
-code), which is unfortunately one of our thorniest modules.  Part of
+code), which is unfortunately one of our thorniest modules. Part of
 the reason that it's thorny is that it needs to support a lot of
 different flows:
 
-* The user clicking on an in-app link, which in turn opens an overlay.
+- The user clicking on an in-app link, which in turn opens an overlay.
   For example the streams overlay opens when the user clicks the small
   cog symbol on the left sidebar, which is in fact a link to
-  `/#streams`.  This makes it easy to have simple links around the app
+  `/#streams`. This makes it easy to have simple links around the app
   without custom click handlers for each one.
-* The user uses the "back" button in their browser (basically
-  equivalent to the previous one, as a *link* out of the browser history
+- The user uses the "back" button in their browser (basically
+  equivalent to the previous one, as a _link_ out of the browser history
   will be visited).
-* The user clicking some in-app click handler (e.g. "Stream settings"
+- The user clicking some in-app click handler (e.g. "Stream settings"
   for an individual stream), that potentially does
   several UI-manipulating things including e.g. loading the streams
   overlay, and needs to update the hash without re-triggering the open
   animation (etc.).
-* Within an overlay like the streams overlay, the user clicks to
+- Within an overlay like the streams overlay, the user clicks to
   another part of the overlay, which should update the hash but not
   re-trigger loading the overlay (which would result in a confusing
   animation experience).
-* The user is in a part of the webapp, and reloads their browser window.
+- The user is in a part of the webapp, and reloads their browser window.
   Ideally the reloaded browser window should return them to their
   original state.
-* A server-initiated browser reload (done after a new version is
+- A server-initiated browser reload (done after a new version is
   deployed, or when a user comes back after being idle for a while,
   see [notes below][self-server-reloads]), where we try to preserve
   extra state (e.g. content of compose box, scroll position within a
@@ -56,21 +56,21 @@ that it's easy to accidentally break something.
 
 The main external API lives in `static/js/browser_history.js`:
 
-* `browser_history.update` is used to update the browser
+- `browser_history.update` is used to update the browser
   history, and it should be called when the app code is taking care
   of updating the UI directly
-* `browser_history.go_to_location` is used when you want the `hashchange`
+- `browser_history.go_to_location` is used when you want the `hashchange`
   module to actually dispatch building the next page
 
 Internally you have these functions:
 
-* `hashchange.hashchanged` is the function used to handle the hash,
+- `hashchange.hashchanged` is the function used to handle the hash,
   whether it's changed by the browser (e.g. by clicking on a link to
   a hash or using the back button) or triggered internally.
-* `hashchange.do_hashchange_normal` handles most cases, like loading the main
+- `hashchange.do_hashchange_normal` handles most cases, like loading the main
   page (but maybe with a specific URL if you are narrowed to a
   stream or topic or PMs, etc.).
-* `hashchange.do_hashchange_overlay` handles overlay cases.  Overlays have
+- `hashchange.do_hashchange_overlay` handles overlay cases. Overlays have
   some minor complexity related to remembering the page from
   which the overlay was launched, as well as optimizing in-page
   transitions (i.e. don't close/re-open the overlay if you can
@@ -81,22 +81,22 @@ Internally you have these functions:
 There are a few circumstances when the Zulip browser window needs to
 reload itself:
 
-* If the browser has been offline for more than 10 minutes, the
+- If the browser has been offline for more than 10 minutes, the
   browser's [event queue][events-system] will have been
   garbage-collected by the server, meaning the browser can no longer
-  get real-time updates altogether.  In this case, the browser
-  auto-reloads immediately in order to reconnect.  We have coded an
+  get real-time updates altogether. In this case, the browser
+  auto-reloads immediately in order to reconnect. We have coded an
   unsuspend callback (based on some clever time logic) that ensures we
   check immediately when a client unsuspends; grep for `watchdog` to
   see the code.
-* If a new version of the server has been deployed, we want to reload
-  the browser so that it will start running the latest code.  However,
-  we don't want server deploys to be disruptive.  So, the backend
+- If a new version of the server has been deployed, we want to reload
+  the browser so that it will start running the latest code. However,
+  we don't want server deploys to be disruptive. So, the backend
   preserves user-side event queues (etc.) and just pushes a special
-  `restart` event to all clients.  That event causes the browser to
+  `restart` event to all clients. That event causes the browser to
   start looking for a good time to reload, based on when the user is
   idle (ideally, we'd reload when they're not looking and restore
-  state so that the user never knew it happened!).  The logic for
+  state so that the user never knew it happened!). The logic for
   doing this is in `static/js/reload.js`; but regardless we'll reload
   within 30 minutes unconditionally.
 
@@ -106,10 +106,10 @@ reload itself:
 
 Here are some key functions in the reload system:
 
-* `reload.preserve_state` is called when a server-initiated browser
+- `reload.preserve_state` is called when a server-initiated browser
   reload happens, and encodes a bunch of data like the current scroll
   position into the hash.
-* `reload.initialize` handles restoring the preserved state after a
+- `reload.initialize` handles restoring the preserved state after a
   reload where the hash starts with `/#reload`.
 
 ## All reloads

docs/subsystems/hotspots.md

@@ -17,7 +17,7 @@ In `zerver/lib/hotspots.py`, add your content to the `ALL_HOTSPOTS` dictionary.
 Each key-value pair in `ALL_HOTSPOTS` associates the name of the hotspot with the
 content displayed to the user.
 
-```
+```python
 ALL_HOTSPOTS = {
     ...
     'new_hotspot_name': {
@@ -32,8 +32,8 @@ ALL_HOTSPOTS = {
 The target element and visual orientation of each hotspot is specified in
 `HOTSPOT_LOCATIONS` of `static/js/hotspots.js`.
 
-The `icon_offset` property specifies where the pulsing icon is placed *relative to
-the width and height of the target element*.
+The `icon_offset` property specifies where the pulsing icon is placed _relative to
+the width and height of the target element_.
 
 By default, `popovers.compute_placement` is used to responsively
 determine whether a popover is best displayed above (TOP), below (BOTTOM),
@@ -48,11 +48,12 @@ However, if you would like to fix the orientation of a hotspot popover, a
 To test your hotspot in the development environment, set
 `ALWAYS_SEND_ALL_HOTSPOTS = True` in `zproject/dev_settings.py`, and
 invoke `hotspots.initialize()` in your browser console. Every hotspot
-should be displayed.  Note that this setting has a bug that can result
+should be displayed. Note that this setting has a bug that can result
 in multiple copies of hotspots appearing; you can clear that by
 reloading the browser.
 
 Here are some visual characteristics to confirm:
+
 - popover content is readable
 - icons reposition themselves on resize
 - icons are hidden and shown along with their associated elements
@@ -67,8 +68,9 @@ a target element on a sidebar or overlay, the icon's z-index may need to
 be increased to 101, 102, or 103.
 
 This adjustment can be made at the bottom of `static/styles/hotspots.css`:
-```
-\#hotspot_new_hotspot_name_icon {
+
+```css
+#hotspot_new_hotspot_name_icon {
     z-index: 103;
 }
 ```

docs/subsystems/html-css.md

@@ -3,12 +3,12 @@
 ## Zulip CSS organization
 
 The Zulip application's CSS can be found in the `static/styles/`
-directory.  Zulip uses [Bootstrap](https://getbootstrap.com/) as its
+directory. Zulip uses [Bootstrap](https://getbootstrap.com/) as its
 main third-party CSS library.
 
-Zulip uses PostCSS for its CSS files.  There are two high-level sections
+Zulip uses PostCSS for its CSS files. There are two high-level sections
 of CSS: the "portico" (logged-out pages like /help/, /login/, etc.),
-and the app.  The portico CSS lives under the `static/styles/portico`
+and the app. The portico CSS lives under the `static/styles/portico`
 subdirectory.
 
 ## Editing Zulip CSS
@@ -33,8 +33,8 @@ browser window (following backend changes).
 
 Without care, it's easy for a web application to end up with thousands
 of lines of duplicated CSS code, which can make it very difficult to
-understand the current styling or modify it.  We would very much like
-to avoid such a fate.  So please make an effort to reuse existing
+understand the current styling or modify it. We would very much like
+to avoid such a fate. So please make an effort to reuse existing
 styling, clean up now-unused CSS, etc., to keep things maintainable.
 
 ### Be consistent with existing similar UI
@@ -62,16 +62,16 @@ browsers to make sure things look the same.
 
 ### Behavior
 
-* Templates are automatically recompiled in development when the file
-is saved; a refresh of the page should be enough to display the latest
-version. You might need to do a hard refresh, as some browsers cache
-webpages.
+- Templates are automatically recompiled in development when the file
+  is saved; a refresh of the page should be enough to display the latest
+  version. You might need to do a hard refresh, as some browsers cache
+  webpages.
 
-* Variables can be used in templates. The variables available to the
-template are called the **context**. Passing the context to the HTML
-template sets the values of those variables to the value they were
-given in the context. The sections below contain specifics on how the
-context is defined and where it can be found.
+- Variables can be used in templates. The variables available to the
+  template are called the **context**. Passing the context to the HTML
+  template sets the values of those variables to the value they were
+  given in the context. The sections below contain specifics on how the
+  context is defined and where it can be found.
 
 ### Backend templates
 
@@ -84,24 +84,24 @@ found [here][jconditionals].
 
 The context for Jinja2 templates is assembled from a few places:
 
-* `zulip_default_context` in `zerver/context_processors.py`.  This is
-the default context available to all Jinja2 templates.
+- `zulip_default_context` in `zerver/context_processors.py`. This is
+  the default context available to all Jinja2 templates.
 
-* As an argument in the `render` call in the relevant function that
-renders the template. For example, if you want to find the context
-passed to `index.html`, you can do:
+- As an argument in the `render` call in the relevant function that
+  renders the template. For example, if you want to find the context
+  passed to `index.html`, you can do:
 
-```
+```console
 $ git grep zerver/app/index.html '*.py'
 zerver/views/home.py:    response = render(request, 'zerver/app/index.html',
 ```
 
 The next line in the code being the context definition.
 
-* `zproject/urls.py` for some fairly static pages that are rendered
-using `TemplateView`, for example:
+- `zproject/urls.py` for some fairly static pages that are rendered
+  using `TemplateView`, for example:
 
-```
+```python
 path('config-error/google', TemplateView.as_view(
     template_name='zerver/config_error.html',),
     {'google_error': True},),
@@ -151,10 +151,10 @@ relevant background as well.
 ### Primary build process
 
 Zulip's frontend is primarily JavaScript in the `static/js` directory;
-we are working on migrating these to TypeScript modules.  Stylesheets
+we are working on migrating these to TypeScript modules. Stylesheets
 are written in CSS extended by various PostCSS plugins; they are
 converted from plain CSS, and we have yet to take full advantage of
-the features PostCSS offers.  We use Webpack to transpile and build JS
+the features PostCSS offers. We use Webpack to transpile and build JS
 and CSS bundles that the browser can understand, one for each entry
 points specified in `tools/webpack.*assets.json`; source maps are
 generated in the process for better debugging experience.
@@ -188,9 +188,9 @@ first add it to the appropriate place under `static/`.
   version of third-party libraries.
 - Third-party files that we have patched should all go in
   `static/third/`. Tag the commit with "[third]" when adding or
-  modifying a third-party package.  Our goal is to the extent possible
+  modifying a third-party package. Our goal is to the extent possible
   to eliminate patched third-party code from the project.
-- Our own JavaScript and TypeScript files live under `static/js`.  Ideally,
+- Our own JavaScript and TypeScript files live under `static/js`. Ideally,
   new modules should be written in TypeScript (details on this policy below).
 - CSS files live under `static/styles`.
 - Portico JavaScript ("portico" means for logged-out pages) lives under
@@ -203,14 +203,14 @@ For your asset to be included in a development/production bundle, it
 needs to be accessible from one of the entry points defined either in
 `tools/webpack.assets.json` or `tools/webpack.dev-assets.json`.
 
-* If you plan to only use the file within the app proper, and not on the login
+- If you plan to only use the file within the app proper, and not on the login
   page or other standalone pages, put it in the `app` bundle by importing it
   in `static/js/bundles/app.js`.
-* If it needs to be available both in the app and all
+- If it needs to be available both in the app and all
   logged-out/portico pages, import it to
   `static/js/bundles/common.js` which itself is imported to the
   `app` and `common` bundles.
-* If it's just used on a single standalone page which is only used in
+- If it's just used on a single standalone page which is only used in
   a development environment (e.g. `/devlogin`) create a new entry
   point in `tools/webpack.dev-assets.json` or it's used in both
   production and development (e.g. `/stats`) create a new entry point
@@ -224,22 +224,23 @@ If you want to test minified files in development, look for the
 ### How it works in production
 
 A few useful notes are:
-* Zulip installs static assets in production in
-`/home/zulip/prod-static`.  When a new version is deployed, before the
-server is restarted, files are copied into that directory.
-* We use the VFL (versioned file layout) strategy, where each file in
+
+- Zulip installs static assets in production in
+  `/home/zulip/prod-static`. When a new version is deployed, before the
+  server is restarted, files are copied into that directory.
+- We use the VFL (versioned file layout) strategy, where each file in
   the codebase (e.g. `favicon.ico`) gets a new name
-  (e.g. `favicon.c55d45ae8c58.ico`) that contains a hash in it.  Each
+  (e.g. `favicon.c55d45ae8c58.ico`) that contains a hash in it. Each
   deployment, has a manifest file
   (e.g. `/home/zulip/deployments/current/staticfiles.json`) that maps
-  codebase filenames to serving filenames for that deployment.  The
+  codebase filenames to serving filenames for that deployment. The
   benefit of this VFL approach is that all the static files for past
   deployments can coexist, which in turn eliminates most classes of
   race condition bugs where browser windows opened just before a
-  deployment can't find their static assets.  It also is necessary for
+  deployment can't find their static assets. It also is necessary for
   any incremental rollout strategy where different clients get
   different versions of the site.
-* Some paths for files (e.g. emoji) are stored in the
+- Some paths for files (e.g. emoji) are stored in the
   `rendered_content` of past messages, and thus cannot be removed
   without breaking the rendering of old messages (or doing a
   mass-rerender of old messages).
@@ -261,28 +262,28 @@ where one is moving code from an existing JavaScript module, the new
 commit should just move the code, not translate it to TypeScript).
 TypeScript provides more accurate information to development tools,
 allowing for better refactoring, auto-completion and static analysis.
-TypeScript also uses the ES6 module system.  See our documentation on
+TypeScript also uses the ES6 module system. See our documentation on
 [TypeScript static types](../testing/typescript).
 
 Webpack does not ordinarily allow modules to be accessed directly from
 the browser console, but for debugging convenience, we have a custom
 webpack plugin (`tools/debug-require-webpack-plugin.ts`) that exposes
 a version of the `require()` function to the development environment
-browser console for this purpose.  For example, you can access our
-`people` module by evaluating `people =
-require("./static/js/people")`, or the third-party `lodash` module
-with `_ = require("lodash")`.  This mechanism is **not** a stable API
-and should not be used for any purpose other than interactive
-debugging.
+browser console for this purpose. For example, you can access our
+`people` module by evaluating
+`people = require("./static/js/people")`, or the third-party `lodash`
+module with `_ = require("lodash")`. This mechanism is **not** a
+stable API and should not be used for any purpose other than
+interactive debugging.
 
 We have one module, `zulip_test`, that’s exposed as a global variable
 using `expose-loader` for direct use in Puppeteer tests and in the
-production browser console.  If you need to access a variable or
-function in those scenarios, add it to `zulip_test`.  This is also
+production browser console. If you need to access a variable or
+function in those scenarios, add it to `zulip_test`. This is also
 **not** a stable API.
 
-[Jinja2]: http://jinja.pocoo.org/
-[Handlebars]: https://handlebarsjs.com/
+[jinja2]: http://jinja.pocoo.org/
+[handlebars]: https://handlebarsjs.com/
 [trans]: http://jinja.pocoo.org/docs/dev/templates/#i18n
 [jconditionals]: http://jinja.pocoo.org/docs/2.9/templates/#list-of-control-structures
 [hconditionals]: https://handlebarsjs.com/guide/#block_helpers.html

docs/subsystems/input-pills.md

@@ -27,17 +27,17 @@ var pills = input_pill.create({
 ```
 
 You can look at `static/js/user_pill.js` to see how the above
-methods are implemented.  Essentially you just need to convert
+methods are implemented. Essentially you just need to convert
 from raw data (like an email) to structured data (like an object
 with display_value, email, and user_id for a user), and vice
-versa.  The most important field to supply is `display_value`.
+versa. The most important field to supply is `display_value`.
 For user pills `pill_item.display_value === user.full_name`.
 
 ## Typeahead
 
 Pills almost always work in conjunction with typeahead, and
 you will want to provide a `source` function to typeahead
-that can exclude items from the prior pills.  Here is an
+that can exclude items from the prior pills. Here is an
 example snippet from our user group settings code.
 
 ```js
@@ -66,7 +66,6 @@ export function filter_taken_users(items, pill_widget) {
 You can get notifications from the pill code that pills have been
 created/remove.
 
-
 ```js
 pills.onPillCreate(function () {
     update_save_state();

docs/subsystems/logging.md

@@ -1,12 +1,12 @@
 # Logging and error reporting
 
 Having a good system for logging error reporting is essential to
-making a large project like Zulip successful.  Without reliable error
+making a large project like Zulip successful. Without reliable error
 reporting, one has to rely solely on bug reports from users in order
 to produce a working product.
 
 Our goal as a project is to have zero known 500 errors on the backend
-and zero known JavaScript exceptions on the frontend.  While there
+and zero known JavaScript exceptions on the frontend. While there
 will always be new bugs being introduced, that goal is impossible
 without an efficient and effective error reporting framework.
 
@@ -20,19 +20,19 @@ is great for small installations.
 The [Django][django-errors] framework provides much of the
 infrastructure needed by our error reporting system:
 
-* The ability to send emails to the server's administrators with any
-  500 errors, using the `mail_admins` function.  We enhance these data
+- The ability to send emails to the server's administrators with any
+  500 errors, using the `mail_admins` function. We enhance these data
   with extra details (like what user was involved in the error) in
   `zerver/logging_handlers.py`, and then send them to the
   administrator in `zerver/lib/error_notify.py` (which also supports
   sending Zulips to a stream about production errors).
-* The ability to rate-limit certain errors to avoid sending hundreds
+- The ability to rate-limit certain errors to avoid sending hundreds
   of emails in an outage (see `_RateLimitFilter` in
   `zerver/lib/logging_util.py`)
-* A nice framework for filtering passwords and other important user
+- A nice framework for filtering passwords and other important user
   data from the exception details, which we use in
   `zerver/filters.py`.
-* Middleware for handling `JsonableError`, our system for allowing
+- Middleware for handling `JsonableError`, our system for allowing
   code anywhere in Django to report an API-facing `json_error` from
   anywhere in a view code path.
 
@@ -48,10 +48,10 @@ exception, and the full request headers which triggered it.
 ### Backend logging
 
 [Django's logging system][django-logging] uses the standard
-[Python logging infrastructure][python-logging].  We have configured
+[Python logging infrastructure][python-logging]. We have configured
 them so that `logging.exception` and `logging.error` get emailed to
 the server maintainer, while `logging.warning` will just appear in
-`/var/log/zulip/errors.log`.  Lower log levels just appear in the main
+`/var/log/zulip/errors.log`. Lower log levels just appear in the main
 server log (as well as in the log for corresponding process, be it
 `django.log` for the main Django processes or the appropriate
 `events_*` log file for a queue worker).
@@ -60,7 +60,7 @@ server log (as well as in the log for corresponding process, be it
 
 The main Zulip server log contains a line for each backend request.
 It also contains warnings, errors, and the full tracebacks for any
-Python exceptions.  In production, it goes to
+Python exceptions. In production, it goes to
 `/var/log/zulip/server.log`; in development, it goes to the terminal
 where you run `run-dev.py`.
 
@@ -72,7 +72,7 @@ In production, one usually wants to look at `errors.log` for errors
 since the main server log can be very verbose, but the main server log
 can be extremely valuable for investigating performance problems.
 
-```
+```text
 2016-05-20 14:50:22.056 INFO [zr] 127.0.0.1       GET     302 528ms (db: 1ms/1q) (+start: 123ms) / (unauth@zulip via ?)
 [20/May/2016 14:50:22]"GET / HTTP/1.0" 302 0
 2016-05-20 14:50:22.272 INFO [zr] 127.0.0.1       GET     200 124ms (db: 3ms/2q) /login/ (unauth@zulip via ?)
@@ -84,19 +84,20 @@ can be extremely valuable for investigating performance problems.
 ```
 
 The format of this output is:
-* Timestamp
-* Log level
-* Logger name, abbreviated as "zr" for these Zulip request logs
-* IP address
-* HTTP method
-* HTTP status code
-* Time to process
-* (Optional perf data details, e.g. database time/queries, memcached
-time/queries, Django process startup time, Markdown processing time,
-etc.)
-* Endpoint/URL from zproject/urls.py
-* "email via client" showing user account involved (if logged in) and
-the type of client they used ("web", "Android", etc.).
+
+- Timestamp
+- Log level
+- Logger name, abbreviated as "zr" for these Zulip request logs
+- IP address
+- HTTP method
+- HTTP status code
+- Time to process
+- (Optional perf data details, e.g. database time/queries, memcached
+  time/queries, Django process startup time, Markdown processing time,
+  etc.)
+- Endpoint/URL from zproject/urls.py
+- "email via client" showing user account involved (if logged in) and
+  the type of client they used ("web", "Android", etc.).
 
 The performance data details are particularly useful for investigating
 performance problems, since one can see at a glance whether a slow
@@ -105,7 +106,7 @@ processor, in memcached, or in other Python code.
 
 One useful thing to note, however, is that the database time is only
 the time spent connecting to and receiving a response from the
-database.  Especially when response are large, there can often be a
+database. Especially when response are large, there can often be a
 great deal of Python processing overhead to marshall the data from the
 database into Django objects that is not accounted for in these
 numbers.
@@ -114,43 +115,44 @@ numbers.
 
 We have a custom library, called `blueslip` (named after the form used
 at MIT to report problems with the facilities), that takes care of
-reporting JavaScript errors.  In production, this means emailing the
+reporting JavaScript errors. In production, this means emailing the
 server administrators (though the setting controlling this,
 `BROWSER_ERROR_REPORTING`, is disabled by default, since most problems
 are unlikely to be addressable by a system administrator, and it's
 very hard to make JavaScript errors not at least somewhat spammy due
 to the variety of browser versions and sets of extensions that someone
-might use).  In development, this means displaying a highly visible
+might use). In development, this means displaying a highly visible
 overlay over the message view area, to make exceptions in testing a
 new feature hard to miss.
 
-* Blueslip is implemented in `static/js/blueslip.js`.
-* In order to capture essentially any error occurring in the browser,
+- Blueslip is implemented in `static/js/blueslip.js`.
+- In order to capture essentially any error occurring in the browser,
   Blueslip listens for the `error` event on `window`, and has methods
   for being manually triggered by Zulip JavaScript code for warnings
   and assertion failures.
-* Blueslip keeps a log of all the notices it has received during a
+- Blueslip keeps a log of all the notices it has received during a
   browser session, and includes them in reports to the server, so that
-  one can see cases where exceptions chained together.  You can print
-  this log from the browser console using `blueslip =
-  require("./static/js/blueslip"); blueslip.get_log()`.
+  one can see cases where exceptions chained together. You can print
+  this log from the browser console using
+  `blueslip = require("./static/js/blueslip"); blueslip.get_log()`.
 
 Blueslip supports several error levels:
-* `throw new Error(…)`: For fatal errors that cannot be easily
-  recovered from.  We try to avoid using it, since it kills the
+
+- `throw new Error(…)`: For fatal errors that cannot be easily
+  recovered from. We try to avoid using it, since it kills the
   current JS thread, rather than returning execution to the caller.
-* `blueslip.error`: For logging of events that are definitely caused
+- `blueslip.error`: For logging of events that are definitely caused
   by a bug and thus sufficiently important to be reported, but where
   we can handle the error without creating major user-facing problems
   (e.g. an exception when handling a presence update).
-* `blueslip.warn`: For logging of events that are a problem but not
-  important enough to send an email about in production.  They are,
+- `blueslip.warn`: For logging of events that are a problem but not
+  important enough to send an email about in production. They are,
   however, highlighted in the JS console in development.
-* `blueslip.log` (and `blueslip.info`): Logged to the JS console in
-  development and also in the blueslip log in production.  Useful for
+- `blueslip.log` (and `blueslip.info`): Logged to the JS console in
+  development and also in the blueslip log in production. Useful for
   data that might help discern what state the browser was in during an
   error (e.g. whether the user was in a narrow).
-* `blueslip.debug`: Similar to `blueslip.log`, but are not printed to
+- `blueslip.debug`: Similar to `blueslip.log`, but are not printed to
   the JS console in development.
 
 ## Frontend performance reporting
@@ -159,12 +161,12 @@ In order to make it easier to debug potential performance problems in
 the critically latency-sensitive message sending code pathway, we log
 and report to the server the following whenever a message is sent:
 
-* The time the user triggered the message (aka the start time).
-* The time the `send_message` response returned from the server.
-* The time the message was received by the browser from the
+- The time the user triggered the message (aka the start time).
+- The time the `send_message` response returned from the server.
+- The time the message was received by the browser from the
   `get_events` protocol (these last two race with each other).
-* Whether the message was locally echoed.
-* If so, whether there was a disparity between the echoed content and
+- Whether the message was locally echoed.
+- If so, whether there was a disparity between the echoed content and
   the server-rendered content, which can be used for statistics on how
   effective our [local echo system](../subsystems/markdown.md) is.
 
@@ -173,9 +175,9 @@ The code is all in `zerver/lib/report.py` and `static/js/sent_messages.js`.
 We have similar reporting for the time it takes to narrow / switch to
 a new view:
 
-* The time the action was initiated
-* The time when the updated message feed was visible to the user
-* The time when the browser was idle again after switching views
+- The time the action was initiated
+- The time when the updated message feed was visible to the user
+- The time when the browser was idle again after switching views
   (intended to catch issues where we generate a lot of deferred work).
 
 [django-errors]: https://docs.djangoproject.com/en/2.2/howto/error-reporting/

docs/subsystems/management-commands.md

@@ -5,7 +5,7 @@ live under `{zerver,zilencer,analytics}/management/commands/`.
 
 If you need some Python code to run with a Zulip context (access to
 the database, etc.) in a script, it should probably go in a management
-command.  The key thing distinguishing these from production scripts
+command. The key thing distinguishing these from production scripts
 (`scripts/`) and development scripts (`tools/`) is that management
 commands can access the database.
 
@@ -13,43 +13,43 @@ While Zulip takes advantage of built-in Django management commands for
 things like managing Django migrations, we also have dozens that we've
 written for a range of purposes:
 
-* Cron jobs to do regular updates, e.g. `update_analytics_counts.py`,
+- Cron jobs to do regular updates, e.g. `update_analytics_counts.py`,
   `sync_ldap_user_data`, etc.
-* Useful parts of provisioning or upgrading a Zulip development
+- Useful parts of provisioning or upgrading a Zulip development
   environment or server, e.g. `makemessages`, `compilemessages`,
   `populate_db`, `fill_memcached_caches`, etc.
-* The actual scripts run by supervisord to run the persistent
+- The actual scripts run by supervisord to run the persistent
   processes in a Zulip server, e.g. `runtornado` and `process_queue`.
-* For a sysadmin to verify a Zulip server's configuration during
-installation, e.g. `checkconfig`, `send_test_email`.
-* As the interface for doing those rare operations that don't have a
+- For a sysadmin to verify a Zulip server's configuration during
+  installation, e.g. `checkconfig`, `send_test_email`.
+- As the interface for doing those rare operations that don't have a
   UI yet, e.g. `deactivate_realm`, `reactivate_realm`,
   `change_user_email` (for the case where the user doesn't control the
   old email address).
-* For a sysadmin to easily interact with and script common possible
+- For a sysadmin to easily interact with and script common possible
   changes they might want to make to the database on a Zulip server.
   E.g. `send_password_reset_email`, `export`, `purge_queue`.
 
 ## Writing management commands
 
 It's generally pretty easy to template off an existing management
-command to write a new one.  Some good examples are
-`change_user_email` and `deactivate_realm`.  The Django documentation
+command to write a new one. Some good examples are
+`change_user_email` and `deactivate_realm`. The Django documentation
 is good, but we have a few pieces advice specific to the Zulip
 project.
 
-* If you need to access a realm or user, use the `ZulipBaseCommand`
+- If you need to access a realm or user, use the `ZulipBaseCommand`
   class in `zerver/lib/management.py` so you don't need to write the
-  tedious code of looking those objects up.  This is especially
+  tedious code of looking those objects up. This is especially
   important for users, since the library handles the issues around
   looking up users by email well (if there's a unique user with that
   email, just modify it without requiring the user to specify the
   realm as well, but if there's a collision, throw a nice error).
-* Avoid writing a lot of code in management commands; management
+- Avoid writing a lot of code in management commands; management
   commands are annoying to unit test, and thus easier to maintain if
   all the interesting logic is in a nice function that is unit tested
-  (and ideally, also used in Zulip's existing code).  Look for code in
-  `zerver/lib/` that already does what you need.  For most actions,
+  (and ideally, also used in Zulip's existing code). Look for code in
+  `zerver/lib/` that already does what you need. For most actions,
   you can just call a `do_change_foo` type function from
   `zerver/lib/actions.py` to do all the work; this is usually far
   better than manipulating the database directly, since the library

docs/subsystems/markdown.md

@@ -1,13 +1,13 @@
 # Markdown implementation
 
 Zulip uses a special flavor of Markdown/CommonMark for its message
-formatting.  Our Markdown flavor is unique primarily to add important
+formatting. Our Markdown flavor is unique primarily to add important
 extensions, such as quote blocks and math blocks, and also to do
-previews and correct issues specific to the chat context.  Beyond
+previews and correct issues specific to the chat context. Beyond
 that, it has a number of minor historical variations resulting from
 its history predacting CommonMark (and thus Zulip choosing different
 solutions to some problems) and based in part on Python-Markdown,
-which is proudly a classic Markdown implementation.  We reduce these
+which is proudly a classic Markdown implementation. We reduce these
 variations with every major Zulip release.
 
 Zulip has two implementations of Markdown. The backend implementation
@@ -15,11 +15,11 @@ at `zerver/lib/markdown/` is based on
 [Python-Markdown](https://pypi.python.org/pypi/Markdown) and is used to
 authoritatively render messages to HTML (and implements
 slow/expensive/complex features like querying the Twitter API to
-render tweets nicely).  The frontend implementation is in JavaScript,
+render tweets nicely). The frontend implementation is in JavaScript,
 based on [marked.js](https://github.com/chjj/marked)
 (`static/js/echo.js`), and is used to preview and locally echo
 messages the moment the sender hits Enter, without waiting for round
-trip from the server.  Those frontend renderings are only shown to the
+trip from the server. Those frontend renderings are only shown to the
 sender of a message, and they are (ideally) identical to the backend
 rendering.
 
@@ -28,12 +28,12 @@ The JavaScript Markdown implementation has a function,
 contains any syntax that needs to be rendered to HTML on the backend.
 If `markdown.contains_backend_only_syntax` returns true, the frontend simply won't
 echo the message for the sender until it receives the rendered HTML
-from the backend.  If there is a bug where `markdown.contains_backend_only_syntax`
+from the backend. If there is a bug where `markdown.contains_backend_only_syntax`
 returns false incorrectly, the frontend will discover this when the
 backend returns the newly sent message, and will update the HTML based
 on the authoritative backend rendering (which would cause a change in
 the rendering that is visible only to the sender shortly after a
-message is sent).  As a result, we try to make sure that
+message is sent). As a result, we try to make sure that
 `markdown.contains_backend_only_syntax` is always correct.
 
 ## Testing
@@ -46,24 +46,24 @@ The Python-Markdown implementation is tested by
 A shared set of fixed test data ("test fixtures") is present in
 `zerver/tests/fixtures/markdown_test_cases.json`, and is automatically used
 by both test suites; as a result, it is the preferred place to add new
-tests for Zulip's Markdown system.  Some important notes on reading
+tests for Zulip's Markdown system. Some important notes on reading
 this file:
 
-* `expected_output` is the expected output for the backend Markdown
+- `expected_output` is the expected output for the backend Markdown
   processor.
-* When the frontend processor doesn't support a feature and it should
+- When the frontend processor doesn't support a feature and it should
   just be rendered on the backend, we set `backend_only_rendering` to
   `true` in the fixtures; this will automatically verify that
   `markdown.contains_backend_only_syntax` rejects the syntax, ensuring
   it will be rendered only by the backend processor.
-* When the two processors disagree, we set `marked_expected_output` in
-  the fixtures; this will ensure that the syntax stays that way.  If
+- When the two processors disagree, we set `marked_expected_output` in
+  the fixtures; this will ensure that the syntax stays that way. If
   the differences are important (i.e. not just whitespace), we should
   also open an issue on GitHub to track the problem.
-* For mobile push notifications, we need a text version of the
+- For mobile push notifications, we need a text version of the
   rendered content, since the APNS and GCM push notification systems
-  don't support richer markup.  Mostly, this involves stripping HTML,
-  but there's some syntax we take special care with.  Tests for what
+  don't support richer markup. Mostly, this involves stripping HTML,
+  but there's some syntax we take special care with. Tests for what
   this plain-text version of content should be are stored in the
   `text_content` field.
 
@@ -72,10 +72,10 @@ implementation, the easiest way to do this is as follows:
 
 1. Log in to your development server.
 2. Stop your Zulip server with Ctrl-C, leaving the browser open.
-3. Compose and send the messages you'd like to test.  They will be
+3. Compose and send the messages you'd like to test. They will be
    locally echoed using the frontend rendering.
 
-This procedure prevents any server-side rendering.  If you don't do
+This procedure prevents any server-side rendering. If you don't do
 this, backend will likely render the Markdown you're testing and swap
 it in before you can see the frontend's rendering.
 
@@ -91,51 +91,51 @@ tests with `tools/test-js-with-node markdown` and backend tests with
 
 First, you will likely find these third-party resources helpful:
 
-* **[Python-Markdown](https://pypi.python.org/pypi/Markdown)** is the Markdown
+- **[Python-Markdown](https://pypi.python.org/pypi/Markdown)** is the Markdown
   library used by Zulip as a base to build our custom Markdown syntax upon.
-* **[Python's XML ElementTree](https://docs.python.org/3/library/xml.etree.elementtree.html)**
+- **[Python's XML ElementTree](https://docs.python.org/3/library/xml.etree.elementtree.html)**
   is the part of the Python standard library used by Python Markdown
   and any custom extensions to generate and modify the output HTML.
 
 When changing Zulip's Markdown syntax, you need to update several
 places:
 
-* The backend Markdown processor (`zerver/lib/markdown/__init__.py`).
-* The frontend Markdown processor (`static/js/markdown.js` and sometimes
+- The backend Markdown processor (`zerver/lib/markdown/__init__.py`).
+- The frontend Markdown processor (`static/js/markdown.js` and sometimes
   `static/third/marked/lib/marked.js`), or `markdown.contains_backend_only_syntax` if
   your changes won't be supported in the frontend processor.
-* If desired, the typeahead logic in `static/js/composebox_typeahead.js`.
-* The test suite, probably via adding entries to `zerver/tests/fixtures/markdown_test_cases.json`.
-* The in-app Markdown documentation (`markdown_help_rows` in `static/js/info_overlay.js`).
-* The list of changes to Markdown at the end of this document.
+- If desired, the typeahead logic in `static/js/composebox_typeahead.js`.
+- The test suite, probably via adding entries to `zerver/tests/fixtures/markdown_test_cases.json`.
+- The in-app Markdown documentation (`markdown_help_rows` in `static/js/info_overlay.js`).
+- The list of changes to Markdown at the end of this document.
 
 Important considerations for any changes are:
 
-* Security: A bug in the Markdown processor can lead to XSS issues.
+- Security: A bug in the Markdown processor can lead to XSS issues.
   For example, we should not insert unsanitized HTML from a
   third-party web application into a Zulip message.
-* Uniqueness: We want to avoid users having a bad experience due to
+- Uniqueness: We want to avoid users having a bad experience due to
   accidentally triggering Markdown syntax or typeahead that isn't
   related to what they are trying to express.
-* Performance: Zulip can render a lot of messages very quickly, and
-  we'd like to keep it that way.  New regular expressions similar to
+- Performance: Zulip can render a lot of messages very quickly, and
+  we'd like to keep it that way. New regular expressions similar to
   the ones already present are unlikely to be a problem, but we need
   to be thoughtful about expensive computations or third-party API
   requests.
-* Database: The backend Markdown processor runs inside a Python thread
+- Database: The backend Markdown processor runs inside a Python thread
   (as part of how we implement timeouts for third-party API queries),
   and for that reason we currently should avoid making database
-  queries inside the Markdown processor.  This is a technical
+  queries inside the Markdown processor. This is a technical
   implementation detail that could be changed with a few days of work,
   but is an important detail to know about until we do that work.
-* Testing: Every new feature should have both positive and negative
+- Testing: Every new feature should have both positive and negative
   tests; they're easy to write and give us the flexibility to refactor
   frequently.
 
 ## Per-realm features
 
 Zulip's Markdown processor's rendering supports a number of features
-that depend on realm-specific or user-specific data.  For example, the
+that depend on realm-specific or user-specific data. For example, the
 realm could have
 [linkifiers](https://zulip.com/help/add-a-custom-linkifier)
 or [custom emoji](https://zulip.com/help/add-custom-emoji)
@@ -144,7 +144,7 @@ groups (which depend on data like users' names, IDs, etc.).
 
 At a backend code level, these are controlled by the `message_realm`
 object and other arguments passed into `do_convert` (`sent_by_bot`,
-`translate_emoticons`, `mention_data`, etc.).  Because
+`translate_emoticons`, `mention_data`, etc.). Because
 Python-Markdown doesn't support directly passing arguments into the
 Markdown processor, our logic attaches these data to the Markdown
 processor object via e.g. `_md_engine.zulip_db_data`, and then
@@ -154,7 +154,7 @@ For non-message contexts (e.g. an organization's profile (aka the
 thing on the right-hand side of the login page), stream descriptions,
 or rendering custom profile fields), one needs to just pass in a
 `message_realm` (see, for example, `zulip_default_context` for the
-organization profile code for this).  But for messages, we need to
+organization profile code for this). But for messages, we need to
 pass in attributes like `sent_by_bot` and `translate_emoticons` that
 indicate details about how the user sending the message is configured.
 
@@ -171,21 +171,21 @@ plain text (e.g. emails) that it helps more than getting in the way.
 The main issue for using Markdown in instant messaging is that the
 Markdown standard syntax used in a lot of wikis/blogs has nontrivial
 error rates, where the author needs to go back and edit the post to
-fix the formatting after typing it the first time.  While that's
+fix the formatting after typing it the first time. While that's
 basically fine when writing a blog, it gets annoying very fast in a
 chat product; even though you can edit messages to fix formatting
-mistakes, you don't want to be doing that often.  There are basically
+mistakes, you don't want to be doing that often. There are basically
 2 types of error rates that are important for a product like Zulip:
 
-* What fraction of the time, if you pasted a short technical email
+- What fraction of the time, if you pasted a short technical email
   that you wrote to your team and passed it through your Markdown
   implementation, would you need to change the text of your email for it
-  to render in a reasonable way?  This is the "accidental Markdown
+  to render in a reasonable way? This is the "accidental Markdown
   syntax" problem, common with Markdown syntax like the italics syntax
   interacting with talking about `char *`s.
 
-* What fraction of the time do users attempting to use a particular
-  Markdown syntax actually succeed at doing so correctly?  Syntax like
+- What fraction of the time do users attempting to use a particular
+  Markdown syntax actually succeed at doing so correctly? Syntax like
   required a blank line between text and the start of a bulleted list
   raise this figure substantially.
 
@@ -207,71 +207,70 @@ accurate.
 
 ### Basic syntax
 
-* Enable `nl2br` extension: this means one newline creates a line
+- Enable `nl2br` extension: this means one newline creates a line
   break (not paragraph break).
 
-* Allow only `*` syntax for italics, not `_`. This resolves an issue where
+- Allow only `*` syntax for italics, not `_`. This resolves an issue where
   people were using `_` and hitting it by mistake too often. Asterisks
   surrounded by spaces won't trigger italics, either (e.g. with stock Markdown
   `You should use char * instead of void * there` would produce undesired
   results).
 
-* Allow only `**` syntax for bold, not `__` (easy to hit by mistake if
+- Allow only `**` syntax for bold, not `__` (easy to hit by mistake if
   discussing Python `__init__` or something).
 
-* Add `~~` syntax for strikethrough.
+- Add `~~` syntax for strikethrough.
 
-* Disable special use of `\` to escape other syntax. Rendering `\\` as
+- Disable special use of `\` to escape other syntax. Rendering `\\` as
   `\` was hugely controversial, but having no escape syntax is also
-  controversial.  We may revisit this.  For now you can always put
+  controversial. We may revisit this. For now you can always put
   things in code blocks.
 
 ### Lists
 
-* Allow tacking a bulleted list or block quote onto the end of a
+- Allow tacking a bulleted list or block quote onto the end of a
   paragraph, i.e. without a blank line before it.
 
-* Allow only `*` for bulleted lists, not `+` or `-` (previously
+- Allow only `*` for bulleted lists, not `+` or `-` (previously
   created confusion with diff-style text sloppily not included in a
   code block).
 
-* Disable ordered list syntax: stock Markdown automatically renumbers, which
+- Disable ordered list syntax: stock Markdown automatically renumbers, which
   can be really confusing when sending a numbered list across multiple
   messages.
 
 ### Links
 
-* Enable auto-linkification, both for `http://...` and guessing at
+- Enable auto-linkification, both for `http://...` and guessing at
   things like `t.co/foo`.
 
-* Force links to be absolute. `[foo](google.com)` will go to
+- Force links to be absolute. `[foo](google.com)` will go to
   `http://google.com`, and not `https://zulip.com/google.com` which
   is the default behavior.
 
-* Set `title=`(the URL) on every link tag.
+- Set `title=`(the URL) on every link tag.
 
-* Disable link-by-reference syntax,
+- Disable link-by-reference syntax,
   `[foo][bar]` ... `[bar]: https://google.com`.
 
-* Enable linking to other streams using `#**streamName**`.
-
+- Enable linking to other streams using `#**streamName**`.
 
 ### Code
 
-* Enable fenced code block extension, with syntax highlighting.
+- Enable fenced code block extension, with syntax highlighting.
 
-* Disable line-numbering within fenced code blocks -- the `<table>`
+- Disable line-numbering within fenced code blocks -- the `<table>`
   output confused our web client code.
 
 ### Other
 
-* Disable headings, both `# foo` and `== foo ==` syntax: they don't
+- Disable headings, both `# foo` and `== foo ==` syntax: they don't
   make much sense for chat messages.
 
-* Disabled images with `![]()` (images from links are shown as an inline
+- Disabled images with `![]()` (images from links are shown as an inline
   preview).
 
-* Allow embedding any avatar as a tiny (list bullet size) image.  This
+- Allow embedding any avatar as a tiny (list bullet size) image. This
   is used primarily by version control integrations.
 
-* We added the `~~~ quote` block quote syntax.
+- We added the `~~~ quote` block quote syntax.

docs/subsystems/notifications.md

@@ -11,10 +11,10 @@ the details of the email/mobile push notifications code path.
 Here we name a few corner cases worth understanding in designing this
 sort of notifications system:
 
-* The **idle desktop problem**: We don't want the presence of a
+- The **idle desktop problem**: We don't want the presence of a
   desktop computer at the office to eat all notifications because the
   user has an "online" client that they may not have used in 3 days.
-* The **hard disconnect problem**: A client can lose its connection to
+- The **hard disconnect problem**: A client can lose its connection to
   the Internet (or be suspended, or whatever) at any time, and this
   happens routinely. We want to ensure that races where a user closes
   their laptop shortly after a notifiable message is sent does not
@@ -25,25 +25,26 @@ sort of notifications system:
 
 As a reminder, the relevant part of the flow for sending messages is
 as follows:
-* `do_send_messages` is the synchronous message-sending code path,
+
+- `do_send_messages` is the synchronous message-sending code path,
   and passing the following data in its `send_event` call:
-  * Data about the message's content (E.g. mentions, wildcard
-  mentions, and alert words) and encodes it into the `UserMessage`
-  table's `flags` structure, which is in turn passed into
-  `send_event` for each user receiving the message.
-  * Data about user configuration relevant to the message, such as
-  `push_notify_user_ids` and `stream_notify_user_ids`, are included
-  alongside `flags` in the per-user data structure.
-  * The `presence_idle_user_ids` set, containing the subset of
-  recipient users who are mentioned, are PM recipients, have alert
-  words, or otherwise would normally get a notification, but have not
-  interacted with a Zulip client in the last few minutes.  (Users who
-  have generally will not receive a notification unless the
-  `enable_online_push_notifications` flag is enabled).  This data
-  structure ignores users for whom the message is not notifiable,
-  which is important to avoid this being thousands of `user_ids` for
-  messages to large streams with few currently active users.
-* The Tornado [event queue system](../subsystems/events-system.md)
+  - Data about the message's content (E.g. mentions, wildcard
+    mentions, and alert words) and encodes it into the `UserMessage`
+    table's `flags` structure, which is in turn passed into
+    `send_event` for each user receiving the message.
+  - Data about user configuration relevant to the message, such as
+    `push_notify_user_ids` and `stream_notify_user_ids`, are included
+    alongside `flags` in the per-user data structure.
+  - The `presence_idle_user_ids` set, containing the subset of
+    recipient users who are mentioned, are PM recipients, have alert
+    words, or otherwise would normally get a notification, but have not
+    interacted with a Zulip client in the last few minutes. (Users who
+    have generally will not receive a notification unless the
+    `enable_online_push_notifications` flag is enabled). This data
+    structure ignores users for whom the message is not notifiable,
+    which is important to avoid this being thousands of `user_ids` for
+    messages to large streams with few currently active users.
+- The Tornado [event queue system](../subsystems/events-system.md)
   processes that data, as well as data about each user's active event
   queues, to (1) push an event to each queue needing that message and
   (2) for notifiable messages, pushing an event onto the
@@ -51,107 +52,107 @@ as follows:
   queues. This important message-processing logic has notable extra
   logic not present when processing normal events, both for details
   like splicing `flags` to customize event payloads per-user, as well.
-  * The Tornado system determines whether the user is "offline/idle".
+  - The Tornado system determines whether the user is "offline/idle".
     Zulip's email notifications are designed to not fire when the user
     is actively using Zulip to avoid spam, and this is where those
     checks are implemented.
-  * Users in `presence_idle_user_ids` are always considered idle:
+  - Users in `presence_idle_user_ids` are always considered idle:
     the variable name means "users who are idle because of
     presence". This is how we solve the idle desktop problem; users
     with an idle desktop are treated the same as users who aren't
     logged in for this check.
-  * However, that check does not handle the hard disconnect problem:
+  - However, that check does not handle the hard disconnect problem:
     if a user was present 1 minute before a message was sent, and then
     closed their laptop, the user will not be in
     `presence_idle_user_ids`, and so without an additional mechanism,
     messages sent shortly after a user leaves would never trigger a
     notification (!).
-  * We solve that problem by also notifying if
+  - We solve that problem by also notifying if
     `receiver_is_off_zulip` returns `True`, which checks whether the user has any
     current events system clients registered to receive `message`
     events. This check is done immediately (handling soft disconnects,
     where E.g. the user closes their last Zulip tab and we get the
     `DELETE /events/{queue_id}` request).
-  * The `receiver_is_off_zulip` check is effectively repeated when
+  - The `receiver_is_off_zulip` check is effectively repeated when
     event queues are garbage-collected (in `missedmessage_hook`) by
     looking for whether the queue being garbage-collectee was the only
     one; this second check solves the hard disconnect problem, resulting in
     notifications for these hard-disconnect cases usually coming 10
     minutes late.
-  * The message-edit code path has parallel logic in
+  - The message-edit code path has parallel logic in
     `maybe_enqueue_notifications_for_message_update` for triggering
     notifications in cases like a mention added during message
     editing.
-  * The business logic for all these notification decisions made
+  - The business logic for all these notification decisions made
     inside Tornado has extensive automated test suites; e.g.
     `test_message_edit_notifications.py` covers all the cases around
     editing a message to add/remove a mention.
-  * We may in the future want to add some sort of system for letting
+  - We may in the future want to add some sort of system for letting
     users see past notifications, to help with explaining and
     debugging this system, since it has so much complexity.
-* Desktop notifications are the simplest; they are implemented
+- Desktop notifications are the simplest; they are implemented
   client-side by the web/desktop app's logic
   (`static/js/notifications.js`) inspecting the `flags` fields that
   were spliced into `message` events by the Tornado system, as well as
   the user's notification settings.
-* The queue processors for those queues make the final determination
+- The queue processors for those queues make the final determination
   for whether to send a notification, and do the work to generate an
   email (`zerver/lib/email_notifications.py`) or mobile
-  (`zerver/lib/push_notifications.py`) notification.  We'll detail
+  (`zerver/lib/push_notifications.py`) notification. We'll detail
   this process in more detail for each system below, but it's
   important to know that it's normal for a message to sit in these
   queues for minutes (and in the future, possibly hours).
-* Both queue processor code paths do additional filtering before
+- Both queue processor code paths do additional filtering before
   sending a notification:
-  * Messages that have already been marked as read by the user before
+  - Messages that have already been marked as read by the user before
     the queue processor runs never trigger a notification.
-  * Messages that were already deleted never trigger a notification.
-  * The user-level settings for whether email/mobile notifications are
+  - Messages that were already deleted never trigger a notification.
+  - The user-level settings for whether email/mobile notifications are
     disabled are rechecked, as the user may have disabled one of these
     settings during the queuing period.
-  * The **Email notifications queue processor**, `MissedMessageWorker`,
-  takes care to wait for 2 minutes (hopefully in the future this will be a
-  configuration setting) and starts a thread to batch together multiple
-  messages into a single email. These features are unnecessary
-  for mobile push notifications, because we can live-update those
-  details with a future notification, whereas emails cannot be readily
-  updated once sent.  Zulip's email notifications are styled similarly
-  to GitHub's email notifications, with a clean, simple design that
-  makes replying from an email client possible (using the [incoming
-  email integration](../production/email-gateway.md)).
-  * The **Push notifications queue processor**,
-  `PushNotificationsWorker`, is a simple wrapper around the
-  `push_notifications.py` code that actually sends the
-  notification. This logic is somewhat complicated by having to track
-  the number of unread push notifications to display on the mobile
-  apps' badges, as well as using the [mobile push notifications
-  service](../production/mobile-push-notifications.md) for self-hosted
-  systems.
+  - The **Email notifications queue processor**, `MissedMessageWorker`,
+    takes care to wait for 2 minutes (hopefully in the future this will be a
+    configuration setting) and starts a thread to batch together multiple
+    messages into a single email. These features are unnecessary
+    for mobile push notifications, because we can live-update those
+    details with a future notification, whereas emails cannot be readily
+    updated once sent. Zulip's email notifications are styled similarly
+    to GitHub's email notifications, with a clean, simple design that
+    makes replying from an email client possible (using the [incoming
+    email integration](../production/email-gateway.md)).
+  - The **Push notifications queue processor**,
+    `PushNotificationsWorker`, is a simple wrapper around the
+    `push_notifications.py` code that actually sends the
+    notification. This logic is somewhat complicated by having to track
+    the number of unread push notifications to display on the mobile
+    apps' badges, as well as using the [mobile push notifications
+    service](../production/mobile-push-notifications.md) for self-hosted
+    systems.
 
 The following important constraints are worth understanding about the
 structure of the system, when thinking about changes to it:
 
-* **Bulk database queries** are much more efficient for checking
+- **Bulk database queries** are much more efficient for checking
   details from the database like "which users receiving this message
   are online".
-* **Thousands of users**. Zulip supports thousands of users, and we
+- **Thousands of users**. Zulip supports thousands of users, and we
   want to avoid `send_event()` pushing large amounts of per-user data
   to Tornado via RabbitMQ for scalability reasons.
-* **Tornado doesn't do database queries**. Because the Tornado system
+- **Tornado doesn't do database queries**. Because the Tornado system
   is an asynchronous event-driven framework, and our Django database
-  library is synchronous, database queries are very expensive.  So
+  library is synchronous, database queries are very expensive. So
   these queries need to be done in either `do_send_messages` or the
   queue processor logic. (For example, this means `presence` data
   should be checked in either `do_send_messages` or the queue
   processors, not in Tornado).
-* **Future configuration**. Notification settings are an area that we
+- **Future configuration**. Notification settings are an area that we
   expect to only expand with time, with upcoming features like
   following a topic (to get notifications for messages only within
   that topic in a stream). There are a lot of different workflows
   possible with Zulip's threading, and it's important to make it easy
   for users to set up Zulip's notification to fit as many of those
   workflows as possible.
-* **Message editing**. Zulip supports editing messages, and that
+- **Message editing**. Zulip supports editing messages, and that
   interacts with notifications in ways that require careful handling:
   Notifications should have
   the latest edited content (users often fix typos 30 seconds after

docs/subsystems/performance.md

@@ -1,22 +1,22 @@
 # Performance and scalability
 
 This page aims to give some background to help prioritize work on the
-Zulip's server's performance and scalability.  By scalability, we mean
+Zulip's server's performance and scalability. By scalability, we mean
 the ability of the Zulip server on given hardware to handle a certain
 workload of usage without performance materially degrading.
 
 First, a few notes on philosophy.
 
-* We consider it an important technical goal for Zulip to be fast,
+- We consider it an important technical goal for Zulip to be fast,
   because that's an important part of user experience for a real-time
-  collaboration tool like Zulip.  Many UI features in the Zulip webapp
+  collaboration tool like Zulip. Many UI features in the Zulip webapp
   are designed to load instantly, because all the data required for
   them is present in the initial HTTP response, and both the Zulip
   API and webapp are architected around that strategy.
-* The Zulip database model and server implementation are carefully
+- The Zulip database model and server implementation are carefully
   designed to ensure that every common operation is efficient, with
   automated tests designed to prevent the accidental introductions of
-  inefficient or excessive database queries.  We much prefer doing
+  inefficient or excessive database queries. We much prefer doing
   design/implementation work to make requests fast over the operational
   work of running 2-5x as much hardware to handle the same load.
 
@@ -29,10 +29,11 @@ important to understand the load profiles for production uses.
 
 Zulip servers typically involve a mixture of two very different types
 of load profiles:
-* Open communities like open source projects, online classes,
-  etc. have large numbers of users, many of whom are idle.  (Many of
+
+- Open communities like open source projects, online classes,
+  etc. have large numbers of users, many of whom are idle. (Many of
   the others likely stopped by to ask a question, got it answered, and
-  then didn't need the community again for the next year).  Our own
+  then didn't need the community again for the next year). Our own
   [chat.zulip.org](../contributing/chat-zulip-org.md) is a good
   example for this, with more than 15K total user accounts, of which
   only several hundred have logged in during the last few weeks.
@@ -40,9 +41,9 @@ of load profiles:
   deactivation](../subsystems/sending-messages.html#soft-deactivation)
   to ensure idle users have minimal impact on both server-side
   scalability and request latency.
-* Fulltime teams, like your typical corporate Zulip installation,
+- Fulltime teams, like your typical corporate Zulip installation,
   have users who are mostly active for multiple hours a day and sending a
-  high volume of messages each.  This load profile is most important
+  high volume of messages each. This load profile is most important
   for self-hosted servers, since many of those are used exclusively by
   the employees of the organization running the server.
 
@@ -53,7 +54,7 @@ organizations from each of those two load profiles.
 
 It's important to understand that Zulip has a handful of endpoints
 that result in the vast majority of all server load, and essentially
-every other endpoint is not important for scalability.  We still put
+every other endpoint is not important for scalability. We still put
 effort into making sure those other endpoints are fast for latency
 reasons, but were they to be 10x faster (a huge optimization!), it
 wouldn't materially improve Zulip's scalability.
@@ -63,7 +64,7 @@ around the several specific endpoints that have a combination of
 request volume and cost that makes them important.
 
 That said, it is important to distinguish the load associated with an
-API endpoint from the load associated with a feature.  Almost any
+API endpoint from the load associated with a feature. Almost any
 significant new feature is likely to result in its data being sent to
 the client in `page_params` or `GET /messages`, i.e. one of the
 endpoints important to scalability here. As a result, it is important
@@ -77,30 +78,26 @@ optimizations which save a few milliseconds that would be invisible to the end u
 if they carry any cost in code readability.
 
 In Zulip's documentation, our general rule is to primarily write facts
-that are likely to remain true for a long time.  While the numbers
+that are likely to remain true for a long time. While the numbers
 presented here vary with hardware, usage patterns, and time (there's
 substantial oscillation within a 24 hour period), we expect the rough
 sense of them (as well as the list of important endpoints) is not
 likely to vary dramatically over time.
 
-``` eval_rst
-=======================   ============  ==============  ===============
-Endpoint                  Average time  Request volume  Average impact
-=======================   ============  ==============  ===============
-POST /users/me/presence   25ms          36%             9000
-GET /messages             70ms          3%              2100
-GET /                     300ms         0.3%            900
-GET /events               2ms           44%             880
-GET /user_uploads/*       12ms          5%              600
-POST /messages/flags      25ms          1.5%            375
-POST /messages            40ms          0.5%            200
-POST /users/me/*          50ms          0.04%           20
-=======================   ============  ==============  ===============
-```
+| Endpoint                | Average time | Request volume | Average impact |
+| ----------------------- | ------------ | -------------- | -------------- |
+| POST /users/me/presence | 25ms         | 36%            | 9000           |
+| GET /messages           | 70ms         | 3%             | 2100           |
+| GET /                   | 300ms        | 0.3%           | 900            |
+| GET /events             | 2ms          | 44%            | 880            |
+| GET /user_uploads/\*    | 12ms         | 5%             | 600            |
+| POST /messages/flags    | 25ms         | 1.5%           | 375            |
+| POST /messages          | 40ms         | 0.5%           | 200            |
+| POST /users/me/\*       | 50ms         | 0.04%          | 20             |
 
 The "Average impact" above is computed by multiplying request volume
 by average time; this tells you roughly that endpoint's **relative**
-contribution to the steady-state total CPU load of the system.  It's
+contribution to the steady-state total CPU load of the system. It's
 not precise -- waiting for a network request is counted the same as
 active CPU time, but it's extremely useful for providing intuition for
 what code paths are most important to optimize, especially since
@@ -110,16 +107,16 @@ memcached to do work.
 As one can see, there are two categories of endpoints that are
 important for scalability: those with extremely high request volumes,
 and those with moderately high request volumes that are also
-expensive.  It doesn't matter how expensive, for example, `POST
-/users/me/subscriptions` is for scalability, because the volume is
-negligible.
+expensive. It doesn't matter how expensive, for example,
+`POST /users/me/subscriptions` is for scalability, because the volume
+is negligible.
 
 ### Tornado
 
 Zulip's Tornado-based [real-time push
-system](../subsystems/events-system.md), and in particular `GET
-/events`, accounts for something like 50% of all HTTP requests to a
-production Zulip server.  Despite `GET /events` being extremely
+system](../subsystems/events-system.md), and in particular
+`GET /events`, accounts for something like 50% of all HTTP requests to
+a production Zulip server. Despite `GET /events` being extremely
 high-volume, the typical request takes 1-3ms to process, and doesn't
 use the database at all (though it will access `memcached` and
 `redis`), so they aren't a huge contributor to the overall CPU usage
@@ -132,16 +129,16 @@ usage of a Zulip installation.
 
 It's worth noting that most (~80%) Tornado requests end the
 longpolling via a `heartbeat` event, which are issued to idle
-connections after about a minute.  These `heartbeat` events are
+connections after about a minute. These `heartbeat` events are
 useless aside from avoiding problems with networks/proxies/NATs that
 are configured poorly and might kill HTTP connections that have been
-idle for a minute.  It's likely that with some strategy for detecting
+idle for a minute. It's likely that with some strategy for detecting
 such situations, we could reduce their volume (and thus overall
 Tornado load) dramatically.
 
 Currently, Tornado is sharded by realm, which is sufficient for
 arbitrary scaling of the number of organizations on a multi-tenant
-system like zulip.com.  With a somewhat straightforward set of work,
+system like zulip.com. With a somewhat straightforward set of work,
 one could change this to sharding by `user_id` instead, which will
 eventually be important for individual large organizations with many
 thousands of concurrent users.
@@ -151,9 +148,9 @@ thousands of concurrent users.
 `POST /users/me/presence` requests, which submit the current user's
 presence information and return the information for all other active
 users in the organization, account for about 36% of all HTTP requests
-on production Zulip servers.  See
+on production Zulip servers. See
 [presence](../subsystems/presence.md) for details on this system and
-how it's optimized.  For this article, it's important to know that
+how it's optimized. For this article, it's important to know that
 presence is one of the most important scalability concerns for any
 chat system, because it cannot be cached long, and is structurally a
 quadratic problem.
@@ -162,7 +159,7 @@ Because typical presence requests consume 10-50ms of server-side
 processing time (to fetch and send back live data on all other active
 users in the organization), and are such a high volume, presence is
 the single most important source of steady-state load for a Zulip
-server.  This is true for most other chat server implementations as
+server. This is true for most other chat server implementations as
 well.
 
 There is an ongoing [effort to rewrite the data model for
@@ -181,8 +178,8 @@ Zulip is somewhat unusual among webapps in sending essentially all of the
 data required for the entire Zulip webapp in this single request,
 which is part of why the Zulip webapp loads very quickly -- one only
 needs a single round trip aside from cacheable assets (avatars, images, JS,
-CSS).  Data on other users in the organization, streams, supported
-emoji, custom profile fields, etc., is all included.  The nice thing
+CSS). Data on other users in the organization, streams, supported
+emoji, custom profile fields, etc., is all included. The nice thing
 about this model is that essentially every UI element in the Zulip
 client can be rendered immediately without paying latency to the
 server; this is critical to Zulip feeling performant even for users
@@ -191,13 +188,13 @@ who have a lot of latency to the server.
 There are only a few exceptions where we fetch data in a separate AJAX
 request after page load:
 
-* Message history is managed separately; this is why the Zulip webapp will
+- Message history is managed separately; this is why the Zulip webapp will
   first render the entire site except for the middle panel, and then a
   moment later render the middle panel (showing the message history).
-* A few very rarely accessed data sets like [message edit
+- A few very rarely accessed data sets like [message edit
   history](https://zulip.com/help/view-a-messages-edit-history) are
   only fetched on demand.
-* A few data sets that are only required for administrative settings
+- A few data sets that are only required for administrative settings
   pages are fetched only when loading those parts of the UI.
 
 Requests to `GET /` and `/api/v1/register` that fetch `page_params`
@@ -210,7 +207,7 @@ history](#fetching-message-history).
 The cost for fetching `page_params` varies dramatically based
 primarily on the organization's size, varying from 90ms-300ms for a
 typical organization but potentially multiple seconds for large open
-organizations with 10,000s of users.  There is also smaller
+organizations with 10,000s of users. There is also smaller
 variability based on a individual user's personal data state,
 primarily in that having 10,000s of unread messages results in a
 somewhat expensive query to find which streams/topics those are in.
@@ -221,7 +218,7 @@ greater than a second to be a bug, and there is ongoing work to fix that.
 It can help when thinking about this to imagine `page_params` as what
 in another webapp would have been 25 or so HTTP GET requests, each
 fetching data of a given type (users, streams, custom emoji, etc.); in
-Zulip, we just do all of those in a single API request.  In the
+Zulip, we just do all of those in a single API request. In the
 future, we will likely move to a design that does much of the database
 fetching work for different features in parallel to improve latency.
 
@@ -232,32 +229,32 @@ of active optimization work.
 
 ### Fetching message history
 
-Bulk requests for message content and metadata ([`GET
-/messages`](https://zulip.com/api/get-messages)) account for ~3% of
-total HTTP requests.  The zulip webapp has a few major reasons it does
-a large number of these requests:
+Bulk requests for message content and metadata
+([`GET /messages`](https://zulip.com/api/get-messages)) account for
+~3% of total HTTP requests. The zulip webapp has a few major reasons
+it does a large number of these requests:
 
-* Most of these requests are from users clicking into different views
+- Most of these requests are from users clicking into different views
   -- to avoid certain subtle bugs, Zulip's webapp currently fetches
   content from the server even when it has the history for the
   relevant stream/topic cached locally.
-* When a browser opens the Zulip webapp, it will eventually fetch and
+- When a browser opens the Zulip webapp, it will eventually fetch and
   cache in the browser all messages newer than the oldest unread
-  message in a non-muted context.  This can be in total extremely
+  message in a non-muted context. This can be in total extremely
   expensive for users with 10,000s of unread messages, resulting in a
   single browser doing 100 of these requests.
-* When a new version of the Zulip server is deployed, every browser
+- When a new version of the Zulip server is deployed, every browser
   will reload within 30 minutes to ensure they are running the latest
-  code.  For installations that deploy often like chat.zulip.org and
+  code. For installations that deploy often like chat.zulip.org and
   zulip.com, this can result in a thundering herd effect for both `/`
-  and `GET /messages`.  A great deal of care has been taking in
+  and `GET /messages`. A great deal of care has been taking in
   designing this [auto-reload
   system](../subsystems/hashchange-system.html#server-initiated-reloads)
   to spread most of that herd over several minutes.
 
 Typical requests consume 20-100ms to process, much of which is waiting
 to fetch message IDs from the database and then their content from
-memcached.  While not large in an absolute sense, these requests are
+memcached. While not large in an absolute sense, these requests are
 expensive relative to most other Zulip endpoints.
 
 Some requests, like full-text search for commonly used words, can be
@@ -265,16 +262,16 @@ more expensive, but they are sufficiently rare in an absolute sense so
 as to be immaterial to the overall scalability of the system.
 
 This server-side code path is already heavily optimized on a
-per-request basis.  However, we have technical designs for optimizing
+per-request basis. However, we have technical designs for optimizing
 the overall frequency with which clients need to make these requests
 in two major ways:
 
-* Improving [client-side
+- Improving [client-side
   caching](https://github.com/zulip/zulip/issues/15131) to allow
   caching of narrows that the user has viewed in the current session,
   avoiding repeat fetches of message content during a given session.
-* Adjusting the behavior for clients with 10,000s of unread messages
-  to not fetch as much old message history into the cache.  See [this
+- Adjusting the behavior for clients with 10,000s of unread messages
+  to not fetch as much old message history into the cache. See [this
   issue](https://github.com/zulip/zulip/issues/16697) for relevant
   design work.
 
@@ -284,7 +281,7 @@ scalability cost of fetching message history dramatically.
 ### User uploads
 
 Requests to fetch uploaded files (including user avatars) account for
-about 5% of total HTTP requests.  Zulip spends consistently ~10-15ms
+about 5% of total HTTP requests. Zulip spends consistently ~10-15ms
 processing one of these requests (mostly authorization logic), before
 handing off delivery of the file to `nginx` or S3 (depending on the
 configured [upload backend](../production/upload-backends.md)).
@@ -306,7 +303,7 @@ sent to 50 users triggers ~50 `GET /events` requests.
 
 A typical message-send request takes 20-70ms, with more expensive
 requests typically resulting from [Markdown
-rendering](../subsystems/markdown.md) of more complex syntax.  As a
+rendering](../subsystems/markdown.md) of more complex syntax. As a
 result, these requests are not material to Zulip's scalability.
 Editing messages and adding emoji reactions are very similar to
 sending them for the purposes of performance and scalability, since
@@ -339,11 +336,11 @@ The above doesn't cover all of the work that a production Zulip server
 does; various tasks like sending outgoing emails or recording the data
 that powers [/stats](https://zulip.com/help/analytics) are run by
 [queue processors](../subsystems/queuing.md) and cron jobs, not in
-response to incoming HTTP requests.  In practice, all of these have
+response to incoming HTTP requests. In practice, all of these have
 been written such that they are immaterial to total load and thus
 architectural scalability, though we do from time to time need to do
 operational work to add additional queue processors for particularly
-high-traffic queues.  For all of our queue processors, any
+high-traffic queues. For all of our queue processors, any
 serialization requirements are at most per-user, and thus it would be
 straightforward to shard by `user_id` or `realm_id` if required.
 
@@ -355,7 +352,7 @@ services (memcached, redis, rabbitmq, and most importantly postgres),
 as well as queue processors (which might get backlogged).
 
 In practice, efforts to make an individual endpoint faster will very
-likely reduce the load on these services as well.  But it is worth
+likely reduce the load on these services as well. But it is worth
 considering that database time is a more precious resource than
 Python/CPU time (being harder to scale horizontally).
 

docs/subsystems/pointer.md

@@ -17,18 +17,18 @@ make to the model.
 
 First a bit of terminology:
 
-* "Narrowing" is the process of filtering to a particular subset of
+- "Narrowing" is the process of filtering to a particular subset of
   the messages the user has access to.
 
-* The blue cursor box (the "pointer") is around is called the
-  "selected" message.  Zulip ensures that the currently selected
+- The blue cursor box (the "pointer") is around is called the
+  "selected" message. Zulip ensures that the currently selected
   message is always in-view.
 
 ## Pointer logic
 
 ### Recipient bar: message you clicked
 
-If you enter a narrow by clicking on a message group's *recipient bar*
+If you enter a narrow by clicking on a message group's _recipient bar_
 (stream/topic or private message recipient list at the top of a group
 of messages), Zulip will select the message you clicked on. This
 provides a nice user experience where you get to see the stuff near
@@ -53,7 +53,7 @@ streams.)
 
 ### Unnarrow: previous sequence
 
-When you unnarrow using e.g. the `a`  key, you will automatically be
+When you unnarrow using e.g. the `a` key, you will automatically be
 taken to the same message that was selected in the All messages view before
 you narrowed, unless in the narrow you read new messages, in which
 case you will be jumped forward to the first unread and non-muted
@@ -76,13 +76,13 @@ see [the architectural overview](../overview/architecture-overview.md).
 
 How does Zulip decide whether a message has been read by the user?
 The algorithm needs to correctly handle a range of ways people might
-use the product.  The algorithm is as follows:
+use the product. The algorithm is as follows:
 
-* Any message which is selected or above a message which is selected
-  is marked as read.  So messages are marked as read as you scroll
+- Any message which is selected or above a message which is selected
+  is marked as read. So messages are marked as read as you scroll
   down the keyboard when the pointer passes over them.
 
-* If the whitespace at the very bottom of the feed is in view, all
+- If the whitespace at the very bottom of the feed is in view, all
   messages in view are marked as read.
 
 These two simple rules, combined with the pointer logic above, end up
@@ -95,10 +95,10 @@ thread; search views will never mark messages as read.
 
 ## Testing and development
 
-In a Zulip development environment, you can use `manage.py
-mark_all_messages_unread` to set every user's pointer to 0 and all
-messages as unread, for convenience in testing unread count related
-logic.
+In a Zulip development environment, you can use
+`manage.py mark_all_messages_unread` to set every user's pointer to 0
+and all messages as unread, for convenience in testing unread count
+related logic.
 
 It can be useful to combine this with `manage.py populate_db -n 3000`
 (which rebuilds the database with 3000 initial messages) to ensure a

docs/subsystems/presence.md

@@ -5,53 +5,53 @@ This document explains the model for Zulip's presence.
 In a chat tool like Zulip, users expect to see the “presence” status
 of other users: is the person I want to talk to currently online? If
 not, were they last online 5 minutes ago, or more like an hour ago, or
-a week?  Presence helps set expectations for whether someone is likely
-to respond soon.  To a user, this feature can seem like a simple thing
-that should be easy.  But presence is actually one of the hardest
+a week? Presence helps set expectations for whether someone is likely
+to respond soon. To a user, this feature can seem like a simple thing
+that should be easy. But presence is actually one of the hardest
 scalability problems for a team chat tool like Zulip.
 
 There's a lot of performance-related details in the backend and
-network protocol design that we won't get into here.  The focus of
+network protocol design that we won't get into here. The focus of
 this is what one needs to know to correctly implement a Zulip client's
 presence implementation (e.g. webapp, mobile app, terminal client, or
 other tool that's intended to represent whether a user is online and
 using Zulip).
 
 A client should report to the server every minute a `POST` request to
-`/users/me/presence`, containing the current user's status.  The
-requests contains a few parameters.  The most important is "status",
+`/users/me/presence`, containing the current user's status. The
+requests contains a few parameters. The most important is "status",
 which had 2 valid values:
 
-* "active" -- this means the user has interacted with the client
-  recently.  We use this for the "green" state in the webapp.
-* "idle" -- the user has not interacted with the client recently.
+- "active" -- this means the user has interacted with the client
+  recently. We use this for the "green" state in the webapp.
+- "idle" -- the user has not interacted with the client recently.
   This is important for the case where a user left a Zulip tab open on
-  their desktop at work and went home for the weekend.  We use this
+  their desktop at work and went home for the weekend. We use this
   for the "orange" state in the webapp.
 
 The client receives in the response to that request a data set that,
 for each user, contains their status and timestamp that we last heard
-from that client.  There are a few important details to understand
+from that client. There are a few important details to understand
 about that data structure:
 
-* It's really important that the timestamp is the last time we heard
-  from the client.  A client can only interpret the status to display
+- It's really important that the timestamp is the last time we heard
+  from the client. A client can only interpret the status to display
   about another user by doing a simple computation using the (status,
-  timestamp) pair.  E.g. a user who last used Zulip 1 week ago will
-  have a timestamp of 1 week ago and a status of "active".  Why?
-  Because this correctly handles the race conditions.  For example, if
+  timestamp) pair. E.g. a user who last used Zulip 1 week ago will
+  have a timestamp of 1 week ago and a status of "active". Why?
+  Because this correctly handles the race conditions. For example, if
   the threshold for displaying a user as "offline" was 5 minutes
   since the user was last online, the client can at any time
   accurately compute whether that user is offline (even if the last
   data from the server was 45 seconds ago, and the user was last
   online 4:30 before the client received that server data).
-* Users can disable their own presence updates in user settings
+- Users can disable their own presence updates in user settings
   (`UserProfile.presence_enabled` is the flag storing [this user
   preference](https://zulip.com/help/status-and-availability#disable-updating-availability)).
-* The `status_from_timestamp` function in `static/js/presence.js` is
+- The `status_from_timestamp` function in `static/js/presence.js` is
   useful sample code; the `OFFLINE_THRESHOLD_SECS` check is critical
   to correct output.
-* We provide the data for e.g. whether the user was online on their
+- We provide the data for e.g. whether the user was online on their
   desktop or the mobile app, but for a basic client, you will likely
   only want to parse the "aggregated" key, which shows the summary
   answer for "is this user online".

docs/subsystems/queuing.md

@@ -1,26 +1,26 @@
 # Queue processors
 
-Zulip uses RabbitMQ to manage a system of internal queues.  These are
+Zulip uses RabbitMQ to manage a system of internal queues. These are
 used for a variety of purposes:
 
-* Asynchronously doing expensive operations like sending email
+- Asynchronously doing expensive operations like sending email
   notifications which can take seconds per email and thus would
   otherwise time out when 100s are triggered at once (E.g. inviting a
   lot of new users to a realm).
 
-* Asynchronously doing non-time-critical somewhat expensive operations
+- Asynchronously doing non-time-critical somewhat expensive operations
   like updating analytics tables (e.g. UserActivityInternal) which
   don't have any immediate runtime effect.
 
-* Communicating events to push to clients (browsers, etc.) from the
+- Communicating events to push to clients (browsers, etc.) from the
   main Zulip Django application process to the Tornado-based events
-  system.  Example events might be that a new message was sent, a user
+  system. Example events might be that a new message was sent, a user
   has changed their subscriptions, etc.
 
-* Processing mobile push notifications and email mirroring system
+- Processing mobile push notifications and email mirroring system
   messages.
 
-* Processing various errors, frontend tracebacks, and slow database
+- Processing various errors, frontend tracebacks, and slow database
   queries in a batched fashion.
 
 Needless to say, the RabbitMQ-based queuing system is an important
@@ -35,23 +35,23 @@ custom integration defined in `zerver/lib/queue.py`.
 
 To add a new queue processor:
 
-* Define the processor in `zerver/worker/queue_processors.py` using
+- Define the processor in `zerver/worker/queue_processors.py` using
   the `@assign_queue` decorator; it's pretty easy to get the template
-  for an existing similar queue processor.  This suffices to test your
+  for an existing similar queue processor. This suffices to test your
   queue worker in the Zulip development environment
   (`tools/run-dev.py` will automatically restart the queue processors
-  and start running your new queue processor code).  You can also run
-  a single queue processor manually using e.g. `./manage.py
-  process_queue --queue=user_activity`.
+  and start running your new queue processor code). You can also run
+  a single queue processor manually using e.g.
+  `./manage.py process_queue --queue=user_activity`.
 
-* So that supervisord will know to run the queue processor in
+- So that supervisord will know to run the queue processor in
   production, you will need to add to the `queues` variable in
   `puppet/zulip/manifests/app_frontend_base.pp`; the list there is
   used to generate `/etc/supervisor/conf.d/zulip.conf`.
 
 The queue will automatically be added to the list of queues tracked by
 `scripts/nagios/check-rabbitmq-consumers`, so Nagios can properly
-check whether a queue processor is running for your queue.  You still
+check whether a queue processor is running for your queue. You still
 need to update the sample Nagios configuration in `puppet/zulip_ops`
 manually.
 
@@ -61,12 +61,12 @@ You can publish events to a RabbitMQ queue using the
 `queue_json_publish` function defined in `zerver/lib/queue.py`.
 
 An interesting challenge with queue processors is what should happen
-when queued events in Zulip's backend tests.  Our current solution is
+when queued events in Zulip's backend tests. Our current solution is
 that in the tests, `queue_json_publish` will (by default) simple call
-the `consume` method for the relevant queue processor.  However,
+the `consume` method for the relevant queue processor. However,
 `queue_json_publish` also supports being passed a function that should
 be called in the tests instead of the queue processor's `consume`
-method.  Where possible, we prefer the model of calling `consume` in
+method. Where possible, we prefer the model of calling `consume` in
 tests since that's more predictable and automatically covers the queue
 processor's code path, but it isn't always possible.
 
@@ -75,14 +75,14 @@ processor's code path, but it isn't always possible.
 If you need to clear a queue (delete all the events in it), run
 `./manage.py purge_queue <queue_name>`, for example:
 
-```
+```bash
 ./manage.py purge_queue user_activity
 ```
 
-You can also use the amqp tools directly.  Install `amqp-tools` from
+You can also use the amqp tools directly. Install `amqp-tools` from
 apt and then run:
 
-```
+```bash
 amqp-delete-queue --username=zulip --password='...' --server=localhost \
    --queue=user_presence
 ```

docs/subsystems/realms.md

@@ -1,6 +1,6 @@
 # Realms in Zulip
 
-Zulip allows multiple *realms* to be hosted on a single instance.
+Zulip allows multiple _realms_ to be hosted on a single instance.
 Realms are the Zulip codebases's internal name for what we refer to in
 user documentation as an organization (the name "realm" comes from
 [Kerberos](https://web.mit.edu/kerberos/)).
@@ -8,7 +8,7 @@ user documentation as an organization (the name "realm" comes from
 Wherever possible, we avoid using the term `realm` in any user-facing
 string or documentation; "Organization" is the equivalent term used in
 those contexts (and we have linters that attempt to enforce this rule
-in translateable strings).  We may in the future modify Zulip's
+in translateable strings). We may in the future modify Zulip's
 internals to use `organization` instead.
 
 The
@@ -19,27 +19,27 @@ are also relevant reading.
 
 There are two main methods for creating realms.
 
-* Using unique link generator
-* Enabling open realm creation
+- Using unique link generator
+- Enabling open realm creation
 
 #### Using unique link generator
 
 ```bash
-    ./manage.py generate_realm_creation_link
+./manage.py generate_realm_creation_link
 ```
 
 The above command will output a URL which can be used for creating a
 new realm and an administrator user for that realm. The link expires
-after the creation of the realm.  The link also expires if not used
+after the creation of the realm. The link also expires if not used
 within 7 days. The expiration period can be changed by modifying
 `REALM_CREATION_LINK_VALIDITY_DAYS` in settings.py.
 
 ### Enabling open realm creation
 
 If you want anyone to be able to create new realms on your server, you
-can enable open realm creation.  This will add a **Create new
+can enable open realm creation. This will add a **Create new
 organization** link to your Zulip homepage footer, and anyone can
-create a new realm by visiting this link (**/new**).  This
+create a new realm by visiting this link (**/new**). This
 feature is disabled by default in production instances, and can be
 enabled by setting `OPEN_REALM_CREATION = True` in settings.py.
 
@@ -57,30 +57,30 @@ records so that the subdomains point to your Zulip installation IP. An
 job.
 
 We also recommend upgrading to at least Zulip 1.7, since older Zulip
-releases had much less nice handling for subdomains.  See our
+releases had much less nice handling for subdomains. See our
 [docs on using subdomains](../production/multiple-organizations.md) for
 user-facing documentation on this.
 
 ### Working with subdomains in development environment
 
 By default, Linux does not provide a convenient way to use subdomains
-in your local development environment.  To solve this problem, we use
+in your local development environment. To solve this problem, we use
 the **zulipdev.com** domain, which has a wildcard A record pointing to
-127.0.0.1.  You can use zulipdev.com to connect to your Zulip
+127.0.0.1. You can use zulipdev.com to connect to your Zulip
 development server instead of localhost. The default realm with the
 Shakespeare users has the subdomain `zulip` and can be accessed by
 visiting **zulip.zulipdev.com**.
 
 If you are behind a **proxy server**, this method won't work. When you
 make a request to load zulipdev.com in your browser, the proxy server
-will try to get the page on your behalf.  Since zulipdev.com points
-to 127.0.0.1 the proxy server is likely to give you a 503 error.  The
+will try to get the page on your behalf. Since zulipdev.com points
+to 127.0.0.1 the proxy server is likely to give you a 503 error. The
 workaround is to disable your proxy for `*.zulipdev.com`. The DNS
 lookup should still work even if you disable proxy for
-*.zulipdev.com. If it doesn't you can add zulipdev.com records in
+\*.zulipdev.com. If it doesn't you can add zulipdev.com records in
 `/etc/hosts` file. The file should look something like this.
 
- ```
+```text
 127.0.0.1    localhost
 
 127.0.0.1    zulipdev.com