From: Maya Chen <maya.chen@example.com>
To: Storage Team <storage-team@example.com>
Subject: Follow-up on replica lag during yesterday’s traffic spike
Date: Fri, 17 Jul 2026 10:42:00 -0400

Hi team,

Yesterday’s traffic spike exposed a replication issue in the distributed key-value store. Three nodes in us-east-2 accumulated roughly 18 seconds of replica lag after compaction and rebalancing overlapped. Reads using eventual consistency continued normally, but a small number of quorum reads timed out.

I’ve temporarily reduced the compaction concurrency and moved rebalancing outside peak hours. Error rates returned to baseline within five minutes, and the cluster has remained healthy since then.

For the permanent fix, I propose that we add backpressure when replica queues exceed the threshold, stagger compaction across failure domains, and alert when quorum latency remains above 250 ms for more than two minutes.

Please review the incident notes before Monday’s reliability meeting. I’d especially appreciate feedback on whether the current consistency defaults are still appropriate for the session and inventory services.

Thanks,
Maya