Export containerd's metrics

[utam0k]

Is your feature request related to a problem? Please describe

This PR will make containerd export metrics at 127.0.0.1:9000/v1/metrics. I would like to be able to have prometheus retrieve this.
https://github.com/gitpod-io/gitpod-packer-gcp-image/pull/190

Describe the behaviour you'd like

We can see container_start metrics on Grafana.
https://github.com/containerd/containerd/blob/9afc778b7354d4b89f02daebcd56eaf85b96c98d/pkg/cri/server/metrics.go#L55

Describe alternatives you've considered

Additional context

This feature request came from
https://www.notion.so/Why-does-gen75-s-workspace-start-slower-be5fc7fdb86c4ea7b964e1cb9cab4654?d=01eeccdc20b9481e98ccdc76781a6463#7c0c8799aa4849a88d3b3c813e7ed2c3

[kylos101]

@ArthurSens We're currently working in https://github.com/gitpod-io/ops/pull/6775, such that we expose containerd metrics via a kube-rbac-proxy daemonset, and ServiceMonitor (which, I think will Prometheus what to scrape).

I'm not sure if we need this issue for the observability repo, things appear to be contained in the ops repo via https://github.com/gitpod-io/ops/pull/6775.

Does that sound right? Is there work to do in the observability repo that I am missing? If no, perhaps we can close this issue as Won't Fix?