Display size and usage of FC type Physical volume

1. Proposed title of this feature request

Display size and usage of FC type Physical volume

2. What is the nature and description of the request?

Using this kind of pv

apiVersion: v1
kind: PersistentVolume
metadata:
  name: fc-pv-2t-1
spec:
  capacity:
    storage: 2Ti
  fc:
    wwids: xxxxxxxxxxxxxxx
    fsType: xfs
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: fc-sc-2t
  volumeMode: Filesystem
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: node-role.kubernetes.io/storageonsan
              operator: Exists 

It would be nice to have a metric that shows size and usage to monitor app health.

3. Why does the customer need this? (List the business requirements here)

Applications can run out of space and capacity planning is not possible without metrics.

4. List any affected packages or components.

Openshift Monitoring