How to monitor

Logging, metrics, tracing, and alerting for the running GitLab application. The patterns here apply to GitLab.com and self-managed installations alike.

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• Logging — JSON logs, where they go, how to query.
• Metrics — Prometheus, exporters, key SLIs.
• Tracing — distributed tracing via Labkit + OpenTelemetry.
• Alerting — what alerts exist and how to add new ones.

The shared library underneath all of this is gitlab-labkit (Ruby) and the corresponding Go labkit, which provide structured logging, request context propagation, Prometheus metrics, and tracing instrumentation.