RDS MariaDB no data for ReplicaLag metric

Question

I have an RDS MariaDB setup with 2 read replicas. For both read replicas, I have stopped getting data for the ReplicaLag metric. The read replicas are still replicating correctly - I have verified this by connecting to them directly.

What can I do to get these metrics to populate again?

Replicas and primary are all MariaDB 10.6.14.

![Image showing RDS monitoring console. ReplicaLag metric stops abruptly while other metrics continue to have data ](/media/postImages/original/IMYkgmgnefT_K0XbYo_cmMwA)

EDIT: I've tried rebooting one of the replicas and applying outstanding maintenance to it, but this made no difference.

Accepted Answer

Apparently this is a known issue and there should hopefully be a fix out by the end of November. I have seen the metric re-appear in us-east-2, but nowhere else yet. If I hear of anything changing about that, I'll stick a note here.

Answer

These metrics have now quietly re-appeared for us in eu-west-2, so I guess you were right Darren. Thanks for the info!

Answer

We've noticed exactly the same thing. We have raised it with AWS, but haven't heard anything back so far. We've also created a new RDS instance with replication set up and no ReplicaLag metric at all. If I hear anything, I'll post back.

RDS MariaDB no data for ReplicaLag metric

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