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Please contact AWS Support in case you are not seeing replication lag in your CloudWatch metric. You can also use the query documented here to check replication lag.
"Check the amount of ReplicaLag between source DB instance and replicas. Replica lag is the amount of time, in milliseconds, that a read replica lags behind its source DB instance. This metric reports the result of the following query."
SELECT extract(epoch from now() - pg_last_xact_replay_timestamp()) AS replica_lag
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