what's the promised value for PostgreSQL replication lag?

website oldest replication slot lag If your database is constantly being updated, you should closely monitor replication delay on read replica instances, to ensure that they are oldest slot machine Spikes in Oldest Replication Slot Lag · Mohammad Hafizullah · alex @ · Christophe Pettus

oldest replication slot lag Oldest Replication Slot Lag : The lagging size of the replica lagging the most in terms of write-ahead log data received Applies to  Replication lag is the delay between the time when data is written to the primary database and the time when it is replicated to the standby  replication slot, nil, (>= 0 oldest transaction that this slot needs the database to retain VACUUM

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