Spinning this out from #109 as a separate issue.

Summarizing the discussion:

Pro: server.address and server.port are interesting, but not essential on SERVER telemetry for the tracing experience (because you can typically get similar identification of the service from service.name)
Con: being able to reconstruct url on server telemetry is useful
Pro: reconstructing url is not reliable since server.address and server.port typically come from Host header