kubernikus
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WIP: Scrape kluster metrics
This PR adds to features:
- It allows us to centrally scrape the kluster metrics (apiserver, ccm, cm scheduler) into a dedicated prometheus with short retention
- It exposes scheduler, cm, ccm metrics via an ingress so that users can start collecting cluster metrics themselves.
The metrics of all components (except etcd) are protected by kubernetes RBAC, so a service account token with RBAC permissions for /metrics is required.