[receiver/k8scluster] Associate hpa metrics with the scale target

[atoulme]

Component(s)

No response

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

HPA objects are associated with a scale target typically expressed with an expression:

  scaleTargetRef:
    apiVersion: apps/v1
    kind: StatefulSet
    name: sample-app

This is not currently present on the hpa metrics and therefore it is difficult to understand which hpa metrics are associated with which target.

Describe the solution you'd like

Add additional dimensions to hpa metrics identifying the metric with the target in a way that allows disambiguation.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners for receiver/k8sclusterreceiver: @dmitryax @TylerHelmuth @povilasv @ChrsMark. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triaged' to set the priority and remove the needs-triaged label.

[atoulme]

open-telemetry/semantic-conventions#2008 is open as a companion task for semantic conventions.