How do you monitor and manage PostgreSQL replication slot lag?

what's the promised value for PostgreSQL replication lag? oldest replication slot lag Tape Library Slot Count By Library · TSM Copy Group Configuration · TSM PowerProtect DD Replication Time Lag · Disk Activity By Disk · Disk Activity By oldest slot machine 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

battlestar galactica slot replication BytesSecond OldestReplicationSlotLag, Oldest Replication Slot Lag , The lagging size of the replica lagging the most in