Remove repmgr referecences

From documentation that referecnes our db replicated support

doc/administration/postgresql/index.md

@@ -16,7 +16,7 @@ There are essentially three setups to choose from.
 This setup is for when you have installed GitLab using the
 [Omnibus GitLab **Enterprise Edition** (EE) package](https://about.gitlab.com/install/?version=ee).
 
-All the tools that are needed like PostgreSQL, PgBouncer, Patroni, and repmgr are bundled in
+All the tools that are needed like PostgreSQL, PgBouncer, and Patroni are bundled in
 the package, so you can it to set up the whole PostgreSQL infrastructure (primary, replica).
 
 [> Read how to set up PostgreSQL replication and failover using Omnibus GitLab](replication_and_failover.md)

doc/administration/postgresql/pgbouncer.md

@@ -164,7 +164,7 @@ and [GitLab upgrades](https://docs.gitlab.com/omnibus/update/README.html#use-pos
 1. To find the primary node, run the following on a database node:
 
    ```shell
-   sudo gitlab-ctl repmgr cluster show
+   sudo gitlab-ctl patroni members
    ```
 
 1. Edit `/etc/gitlab/gitlab.rb` on the application node you're performing the task on, and update

doc/administration/reference_architectures/index.md

@@ -138,12 +138,12 @@ As long as at least one of each component is online and capable of handling the
 ### Automated database failover **(PREMIUM SELF)**
 
 > - Level of complexity: **High**
-> - Required domain knowledge: PgBouncer, Repmgr or Patroni, shared storage, distributed systems
+> - Required domain knowledge: PgBouncer, Patroni, shared storage, distributed systems
 
 By adding automatic failover for database systems, you can enable higher uptime
 with additional database nodes. This extends the default database with
 cluster management and failover policies.
-[PgBouncer in conjunction with Repmgr or Patroni](../postgresql/replication_and_failover.md)
+[PgBouncer in conjunction with Patroni](../postgresql/replication_and_failover.md)
 is recommended.
 
 ### Instance level replication with GitLab Geo **(PREMIUM SELF)**

doc/administration/troubleshooting/postgresql.md

@@ -53,8 +53,7 @@ This section is for links to information elsewhere in the GitLab documentation.
 
 - [PostgreSQL scaling](../postgresql/replication_and_failover.md)
   - Including [troubleshooting](../postgresql/replication_and_failover.md#troubleshooting)
-    `gitlab-ctl repmgr-check-master` (or `gitlab-ctl patroni check-leader` if
-    you're using Patroni) and PgBouncer errors.
+    `gitlab-ctl patroni check-leader` and PgBouncer errors.
 
 - [Developer database documentation](../../development/README.md#database-guides),
   some of which is absolutely not for production use. Including:

doc/development/scalability.md

@@ -119,7 +119,7 @@ that backup, the database can apply the WAL logs in order until the
 database has reached the target time.
 
 On GitLab.com, Consul and Patroni work together to coordinate failovers with
-the read replicas. [Omnibus ships with both repmgr and Patroni](../administration/postgresql/replication_and_failover.md).
+the read replicas. [Omnibus ships with Patroni](../administration/postgresql/replication_and_failover.md).
 
 #### Load-balancing