2025-12-06: Sidekiq queueing SLI violation on memory-bound shard

Sidekiq queueing SLI violation on memory-bound shard (Severity 3)

Problem: A temporary spike in Sidekiq queue length on the memory-bound shard caused some jobs to miss their queueing duration targets.

Impact: A slight increase in queue for the memory-bound shard. The queue backlog was temporary and has returned to normal levels.

Causes: A large spike in Sidekiq queue length was triggered by import jobs from a single user or project.

Response strategy: The queue backlog cleared on its own and the system has recovered.

This ticket was created to track INC-6139, by incident.io 🔥

Edited by GitLab Infrastructure Service - incident.io