This dashboard is based on kubernetes-persistent-volumes (13646). Difference:
- "sum by (persistentvolumeclaim,namespace)" instead of "sum by (persistentvolumeclaim)"
- transform "merge" instead of "outer join"
- This fixing issue in "Persistent Volume Claim" panel when pvcs have same names in multiple namespaces.
- added panel for predict volumes
- changed predict volumes to 5, 10, 20 days
