message: Fix peers metric
diff: @@ -804,6 +804,9 @@ where
  effect_builder: EffectBuilder<REv>,
  peer_id: NodeId,
  ) -> Effects<Event<P>> {
  + self.net_metrics
  + .peers
  + .set(self.connection_symmetries.len() as i64);
  effect_builder.announce_new_peer(peer_id).ignore()
  }
  