AWS RDS: Replica Lag
This check monitors the time a read replica DB instance lags
behind the source DB instance. For PostgreSQL databases, the check
also monitors the lagging size of the replica lagging the most in
terms of write-ahead log (WAL) data received (OldestReplicationSlotLag).
To make this check work you have to configure the related
Amazon Web Services (AWS).
No default levels are set. Upper levels are configurable for
the replica lag age and oldest replication slot lag size via
the rule "AWS/RDS Replica lag".
Name of the instance and region name (to avoid duplicate services
in case of multi-region monitoring).
One service is created for each database if all required metrics
(ReplicaLag) are given.