The spray.routing.directives.BasicDirectives#around directive requires that the caller return a function that will process what happens after the specific spray.routing.Route completes.
The spray.routing.directives.BasicDirectives#around directive requires that the caller return a function that will process what happens after the specific spray.routing.Route completes. This method builds that function.
The prefix that we can send to any of the incrementation handlers.
The function that can deal with the result of the spray.routing.Route's evaluation.
The CounterBase trait provides helpers for derivations that implement specific types of Counter metrics.