2026-03-12: Sidekiq jobs queueing duration SLO violation on all urgent shards

Sidekiq jobs queueing duration SLO violation on all urgent shards (Severity 2)

The Sidekiq queueing apdex on the low-urgency-cpu-bound shard is currently 99.36%, indicating that the proportion of jobs meeting their queueing duration targets has fallen below the defined SLO for the past 6 hours.

This job backlog was caused by LockManager LWLock saturation on ci replica databases. We will add an additional replica in a follow-up to add more headroom.

This ticket was created to track INC-8367, by incident.io 🔥