O.1. recovery.conf file merged into postgresql.conf

O.1. `recovery.conf` file merged into `postgresql.conf`
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## O.1. `recovery.conf` file merged into `postgresql.conf`

PostgreSQL 11 and below used a configuration file named `recovery.conf` to manage replicas and standbys. Support for this file was removed in PostgreSQL 12. See the release notes for PostgreSQL 12 for details on this change.

On PostgreSQL 12 and above, archive recovery, streaming replication, and PITR are configured using normal server configuration parameters. These are set in `postgresql.conf` or via ALTER SYSTEM like any other parameter.

The server will not start if a `recovery.conf` exists.

The `trigger_file` setting has been renamed to promote_trigger_file.

The `standby_mode` setting has been removed. A `standby.signal` file in the data directory is used instead. See Standby Server Operation for details.

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Appendix O. Obsolete or Renamed Features | Home | O.2. Default Roles Renamed to Predefined Roles