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PostgreSQL 11 and below used a configuration file names `recovery.conf` to manage replicas and standbys; support for this was removed in PostgreSQL 12[1], and the configuration parameters were moved into the main `postgresql.conf`. Add `zulip.conf` settings for the primary server hostname and replication username, so that the complete `postgresql.conf` configuration on PostgreSQL 14 can continue to be managed, even when replication is enabled. For consistency, also begin writing out the `recovery.conf` for PostgreSQL 11 and below. In PostgreSQL 12 configuration and later, the `wal_level = hot_standby` setting is removed, as `hot_standby` is equivalent to `replica`, which is the default value[2]. Similarly, the `hot_standby = on` setting is also the default[3]. Documentation is added for these features, and the commentary on the "Export and Import" page referencing files under `puppet/zulip_ops/` is removed, as those files no longer have any replication-specific configuration. [1]: https://www.postgresql.org/docs/current/recovery-config.html [2]: https://www.postgresql.org/docs/12/runtime-config-wal.html#GUC-WAL-LEVEL [3]: https://www.postgresql.org/docs/12/runtime-config-replication.html#GUC-HOT-STANDBY
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