service/ci.md

@@ -34,6 +34,11 @@ the shared runners in a project?
 
 <!-- more in-depth procedure that may require interpretation -->
 
+## Why is my CI job not running?
+
+There might be too many jobs in the queue. You can monitor the queue
+in our [Grafana dashboard](https://grafana.torproject.org/d/QrDJktiMz/gitlab-omnibus).
+
 ## Building docker images
 
 TODO: document how to build docker images from GitLab CI. Maybe with