Rebuild postgres-01 replica
Like discussed in https://gitlab.com/gitlab-com/infrastructure/issues/4893#note_99388982, let's rebuild the postgres replica (no full machine reprovisioning required, just getting a fresh basebackup and start off from there).
The intent is also to start over and see if the replication lag issue persists.
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Resetup replica -
Remove silences https://alerts.gprd.gitlab.net/#/silences -
Update in #production, ping @jurbanc -
Update runbooks with procedure
Edited by Andreas Brandl