How do you monitor and manage PostgreSQL replication slot lag?

oldest replication slot lag
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Replication slots are used to safeguard against the premature deletion of WAL segments before they have been applied by the standby server, thus

Two Amazon CloudWatch metrics, Oldest Replication Slot Lag and Transaction During this phase, the replication lag time for the read replica is greater than 0  Replication Slots · the oldest WAL required by the consumer of the slot

lottery online nc The lag of a replication slot can be measured as the difference between the current WAL location on the primary and the last WAL position confirmed as received The lag between primary and read replica exceeds 16 seconds without any heavy IOPS, sometimes 30 seconds I have spent a lot of effort on