Enhance runtime input with selectors for PVC volumes

[a-thaler]

Description
As part of #972 enhance the current runtime input with a new selector for volumes. It should be disabled by default.

Criterias

• A new selector is added to the runtime input which will emit metrics as outlined in Metric API proposal to cover typical Kubernetes metrics #1001 (comment)
• The selector can be used independent of the other selectors, if this selector is enabled only, only the related metrics are exported
• The new metrics are based on the existing k8sclusterreicever being wrapped with the leader-election-receiver
• Multiple pipelines having different selector settings will result in different metrics being exported
• Assure that only metrics for volumes being attached to a PVC are exported. Other volumes should be filtered out
• Check with the Cloud Manager team how much these metrics are useful for NFS volumes and decide if they should be included or excluded
• The k8sclusterreicever is running at the agent instead of gateway as it is representing an optional input
• There is no runtime instrumentation scope processor in the gateway

Tasks

• Add new feature with filter for PVC volumes
• Align with cloud manager about NFC volumes
• Verify proper instrumentation scope is in use
• Enhance documentation
• Enhance E2E test for runtime input (to assure compatibility of the emmitted metrics)

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Release Notes

[github-actions]

This issue has been automatically marked as stale due to the lack of recent activity. It will soon be closed if no further activity occurs.
Thank you for your contributions.

[rakesh-garimella]

The changes wrt to volume metrics has been implemented and also the k8sCluster has been moved to metric agent