Customer would like to obtain a cost report for OpenShift storage based on some specific storage class, eg:

• filter[storage_class]
• group_by[storage_class]
• exclude[storage_class]
• filter[tag:clientname] + filter[storage_class]
• group_by[tag:clientname] + group_by[storage_class]
• group_by[tag:clientname] + filter[storage_class]

The current workaround is to request all the storage volumes from the API, then filter on their end (eg with `jq` or whatever they use to process the Cost Management JSON data).