The Ceph manager has a plugin that exposes metrics to prometheus. https://docs.ceph.com/docs/master/mgr/prometheus/
Ceph manager is configured to run on all 3 monitor hosts (cloudcephmon100[1-3]).
However, it's only active on one host at any given time. We'll need to configure a load balancer with all 3 backend cloudcephmon100[1-3] hosts on TCP port 9283. The current version of Ceph allows you to add all manager hosts to the prometheus scrape target.
- Enable the prometheus plugin
- Build / Find grafana dashboard
- Identify metrics for alerting