message: Properly unregister old metrics
diff: @@ -321,5 +321,10 @@ impl Drop for NetworkingMetrics {
  unregister_metric!(self.registry, self.out_bytes_deploy_transfer);
  unregister_metric!(self.registry, self.out_bytes_block_transfer);
  unregister_metric!(self.registry, self.out_bytes_other);
  + unregister_metric!(self.registry, self.out_state_connecting);
  + unregister_metric!(self.registry, self.out_state_waiting);
  + unregister_metric!(self.registry, self.out_state_connected);
  + unregister_metric!(self.registry, self.out_state_blocked);
  + unregister_metric!(self.registry, self.out_state_loopback);
  }
  }
  