code: func LogRequest(c context.Context, rpc RPC, req proto.Message, caller identity.Identity) {
  	if !logging.IsLogging(c, logging.Debug) {
  		return
  	}
  	m := jsonpb.Marshaler{Indent: " "}
  	dump, err := m.MarshalToString(req)
  	if err != nil {
  		panic(err)
  	}
  	logging.Debugf(c, "Identity: %s, %s:\n%s", caller, rpc.Name(), dump)
  }
docs: // LogRequest logs the RPC request.