retry metrics specification is a little unclear

[Ladicek]

Some of the retry metrics are specified in a little unclear way:

ft.<name>.retry.callsSucceededNotRetried.total: The number of times the method was called and succeeded without retrying
ft.<name>.retry.callsSucceededRetried.total: The number of times the method was called and succeeded after retrying at least once
ft.<name>.retry.callsFailed.total: The number of times the method was called and ultimately failed after retrying

In all cases, the text seems to assume that there is no other fault tolerance strategy applied. For example, if there's a fallback strategy, then the method will not "ultimately fail" even though all retry attempts fail.

We should provide more clear specification text here, one that doesn't assume absence of other FT strategies and is only worded in terms of the retry operation and not the ultimate result of the method call.