2025-12-05: High Database Replication Lag on gstg

High Database Replication Lag on gstg (Severity 4)

Problem: A monitoring dashboard incorrectly showed significant database replication lag in the GitLab staging environment due to the way lag is calculated in low-traffic systems.

Impact: No actual replication lag was present in the staging environment. The issue was a monitoring false positive and did not impact users or test reliability.

Causes: The method used to measure database replication lag in staging environments overestimated lag due to low transaction rates. In environments with few transactions, the timing metric is misleading and does not reflect actual replication delay.

Response strategy: We verified that replication lag in staging was near zero bytes and confirmed the monitoring was a false positive. No further action required.

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This ticket was created to track INC-6108, by incident.io 🔥