Currently SLRP provides per-CSI-call metrics, e.g.:
If we are to continue to provide such fine-grained metrics, when operators upgrade their CSI plugins to CSI v1, then SLRP would report another set of metrics for v1, which would be inconvenient to operators.
Also the fine-grained metrics are not very useful for operators, as most information are highly correlated to per-operation metrics. So most likely operators would simply aggregate the per-CSI-call metrics for monitoring CSI plugins, and use per-operation metrics to monitor volume creation/destroy/etc.
So instead of provide such fine-grained metrics, we could just provide a set of aggregated rpc metrics that are agnostic to CSI versions, such as: