[receiver/kubeletstats] volume metrics should include pvc reference

[stoetti]

Component(s)

receiver/kubeletstats

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

We want to monitor the available disk space of persistent volumes but the receiver does not provide any information to differentiate by volume type (pvc, emptydir, configmap, ...)

Describe the solution you'd like

The stats endpoint of the kubelet returns a field "pvcref" for volumes of type persistentVolumeClaim. Adding the name and namespace from that field as label would make it possible to monitor actual disk usage for persistent volumes.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/kubeletstats: @dmitryax @TylerHelmuth

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[TylerHelmuth]

@stoetti does the resource attribute k8s.volume.name contain the information you're looking for?

[stoetti]

Unfortunately not as we want to monitor for all workloads in the cluster and the volume name is not an indicator for the type of the volume. This can also not be established as we run external components.

[jinja2]

We do support a subset of volume types and the pvc name is available as attr. You'll need to enable it with the below config

kubeletstats:
  extra_metadata_labels:
    - k8s.volume.type

Example metric with the attribute k8s.persistentvolumeclaim.name

[stoetti]

We do support a subset of volume types and the pvc name is available as attr. You'll need to enable it with the below config

kubeletstats:
  extra_metadata_labels:
    - k8s.volume.type

Example metric with the attribute k8s.persistentvolumeclaim.name

Great that is exactly what I was looking for 👏
It would be helpful to point that out in the docs.