High availability
Postgres FM
How to Alert on Certain Points of Running Out of Transaction IDs
Using synchronous replicas is what the series set up should have. If auto-follower happens, you will have zero data loss because data always exists somewhere already. Unarchived walls are a big problem I noticed in Patroni and we had an incident when we didn't notice that archive command was lagging a lot. So primary accumulated, like say, thousand walls being not backed up. And this can lead to downtime, actually.
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