No proper documentation on how to create your own custom metrics exporter

[Rodrigo010497]

Something like this but more in depth and up to date
https://faun.pub/writing-custom-metrics-exporter-for-kubernetes-hpa-8a2601a53386

[sftim]

/kind feature
/sig instrumentation

Part of this story might work better as a blog article for the Kubernetes blog, and part of this might work better as extra reference docs.

[sftim]

/language en

[sftim]

Related, we might want to document more of the metrics.k8s.io API and how to implement that.

[chrismetz09]

/assign

[logicalhan]

/assign @serathius

[logicalhan]

/triage accepted

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/lifecycle stale