[receiver/k8scluster] Support KSM-equivalent custom resource state metrics

[rtrevi]

Component(s)

receiver/k8scluster

Is your feature request related to a problem? Please describe.

I'm setting up alerts for fluxcd based on prometheus metrics.

Newer versions of Flux drop some of the exposed metrics in favour of kube-state-metrics custom resource state: https://fluxcd.io/flux/monitoring/metrics/#warning-deprecated-resource-metrics

Afaik, there's no existing feature in the k8sclusterreceiver (or in any receiver/processor for that matter) that accomplishes the same as KSM's custom metrics: https://github.com/kubernetes/kube-state-metrics/blob/main/docs/customresourcestate-metrics.md

Describe the solution you'd like

Support defining custom metrics from custom resources status.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/k8scluster: @dmitryax @TylerHelmuth @povilasv

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[povilasv]

The feature is pretty cool and makes sense. But it might be a bit difficult to do. We would need to decide on the syntax of going thru CRDs like (https://github.com/kubernetes/kube-state-metrics/blob/main/docs/customresourcestate-metrics.md#path-syntax) then figure out how to allow users to map the to resource attributes, attributes, one of the value types or units.

Maybe somhow using OTTL here would be possible 🤔

Would be cool to get some kind of proposal / design of the config first.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• receiver/k8scluster: @dmitryax @TylerHelmuth @povilasv

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been closed as inactive because it has been stale for 120 days with no activity.