The upstream PostgreSQL default is 4, which is more appropriate for
spinning disks. In general, production deploys almost always use
SSDs; adjust the Zulip default value to a better value for those.
This generalizes from thumbnail_workers, to include any other queue.
We only additionally choose to document `email_senders_workers`,
however, since other queues are not guaranteed to work correctly with
multiple consumers.
In some cases, it is not possible to configure the load-balancer to
add an X-Forwarded-Proto header. If Zulip is serving its traffic over
HTTP, it will rightly error out, since it cannot guarantee that its
response will be served over an encrypted connection.
Add a new `loadbalancer.rejects_http_requests` settings which serves
as a way for the operator to swear that the load-balancer will *never*
serve responses from Zulip over an unencrypted connection. In most
cases, this is because the load-balancer is configured to have port 80
always serve an HTTP 301 redirect to the same URL over HTTPS.
Properly configuring the proxy to send `X-Forwarded-Proto` is always a
better solution than using this configuration parameter, so use of
this should be viewed as a last resort.
There's no need for sharding, but this allows one to spend a bit of
extra memory to reduce image-processing latency when bursts of images
are uploaded at once.
This only defaults to on for local-disk backups, since they are more
disk-size-sensitive, and local accesses are quite cheap compared to
loading multiple incremental backups from S3.
Replace a separate call to subprocess, starting `node` from scratch,
with an optional standalone node Express service which performs the
rendering. In benchmarking, this reduces the overhead of a KaTeX call
from 120ms to 2.8ms. This is notable because enough calls to KaTeX in
a single message would previously time out the whole message
rendering.
The service is optional because he majority of deployments do not use
enough LaTeX to merit the additional memory usage (60Mb).
Fixes: #17425.
- Makes "Deployment options" easier to navigate by splitting the
"Reverse proxies" and "System configuration" sections out into
dedicated pages.
Fixes#28928.
