fleet manager prometheus metrics

[venkataanil]

SRE is using these prometheus metrics in their grafana dashboards [1]. After fleet manager scale testing, we manually run kube-burner with this metric profile to index into our internal ES. We have internal grafana dashboard [2] which uses these metrics from our ES.

[1] https://grafana.app-sre.devshift.net/d/osd_fleet_manager1/osd-fleet-manager-metrics1 [2] https://grafana.rdu2.scalelab.redhat.com:3000/d/osd_fleet_manager1/osd-fleet-manager-metrics1

[venkataanil]

Initially submitted this file in perfscale-managed-services repo with PR https://github.com/cloud-bulldozer/perfscale-managed-services/pull/110 . However I got suggestions to submit in e2e-benchmarking rather than perfscale-managed-services.