[RFE] demo/docs for metrics with grafana + kube/prom

[pfeifferj]

Description

showcase what can be done with the metrics we collect

[pfeifferj]

/assign @viktoryatheone

[k8s-ci-robot]

@pfeifferj: GitHub didn't allow me to assign the following users: viktoryatheone.

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/assign @viktoryatheone

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