helm: metrics scraping with a serviceMonitor

[cebidhem]

Motivation

As many users deploy Prometheus using kube-prometheus-stack, to give the possibility to have a serviceMonitor to scrape the metrics instead of the annotation based scraping would be nice.

Desired Behavior

If .Values.resotometrics.serviceMonitor.enabled = true, we should:

• create a kind: service pointing to the resotometrics deployment exposed port
• create a kind: serciceMonitor pointing to the above service
• Unset the deployment' scraping annotations

Additional Context

No response