gitlab-unicorn monitoring
We should ensure that GitLab Unicorn is configured and setup to export Prometheus metrics. To do this, it should:
- Use a emptyDir set up for memory to get a tmpfs.
- Ensure GitLab Ruby metrics are enabled, with the tmpfs dir mapped to the output directory: https://docs.gitlab.com/ee/administration/monitoring/prometheus/gitlab_metrics.html#metrics-shared-directory
- Annotations for Prometheus scraping