Often we know metric identity tags at the end of operation. Support this case in api

[swarmshine]

profile{
result = operation()
only here we know that tag status == result.status
}.stop( )

[swarmshine]

profiledCall.start(Identity("rest").withTag("path", path))

val response = makeRestRequest(path)

profiledCall.stop(Identity.tag("status", reponse.getStatus())