k8s: new attributes: CSI driver and volume handle

[gdvalle]

Area(s)

Semantic convention for otelcol's kubeletstatsreceiver, area:k8s.

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

In k8s, I would like to record CSI driver and volume handle information for relevant Persistent Volume Claims (PVCs) to be able to associate metrics to underlying disks.

Describe the solution you'd like

Two new attributes, with each mapping 1:1 to the respective driver/volumeHandle fields in CSIPersistentVolumeSource:

• csi.driver
• csi.volume.handle

And a new value for the k8s.volume.type attribute, csiPersistentVolume.

Describe alternatives you've considered

None

Additional context

This grew from open-telemetry/opentelemetry-collector-contrib#32055

[ChrsMark]

/cc @open-telemetry/semconv-k8s-approvers

Also related to #1032

[ChrsMark]

There is no semantic convention for the k8s.volume.type. #1164 will add this.

[mx-psi]

I removed this from the system semantic conventions WG since this WG does not handle Kubernetes-related semantic conventions