Define and implement FSC performance metrics

[mbrandenburger]

This task is about starting a discussion on defining and implementing FSC performance metrics.
FSC comes with support for prometheus (https://github.com/hyperledger-labs/fabric-smart-client/blob/main/platform/view/services/metrics/operations/metrics.go).

Currently FSC reports the following:

• Commiter:
  • commit
  • isFinal
  • listenTo

What about others?

• View invocations via view manager
• View interactions message size
• Vault usage (size, read/write per sec)
• KVS usage (size, read/write per sec)
• Memory / CPU load

[davidkel]

Given my lack of knowledge of the FSC at this time, the only comment I can currently make is that I don't think we need to worry too much about Memory/CPU Load at this time. We can leave it for other metrics gatherers to collect that information (eg prometheus process explorer, nmon, prometheus k8s).

[davidkel]

Also FSC collects counter metrics on grpc connections opened and closed