validator-discovery: some extra logs (#3157)

* remove duplicate logging

* validator-discovery: add extra logging

polkadot/node/network/bridge/src/validator_discovery.rs

@@ -89,6 +89,7 @@ impl<N: Network, AD: AuthorityDiscovery> Service<N, AD> {
 		// collect multiaddress of validators
 		let mut failed_to_resolve: usize = 0;
 		let mut newly_requested = HashSet::new();
+		let requested = validator_ids.len();
 		for authority in validator_ids.into_iter() {
 			let result = authority_discovery_service.get_addresses_by_authority_id(authority.clone()).await;
 			if let Some(addresses) = result {
@@ -101,15 +102,24 @@ impl<N: Network, AD: AuthorityDiscovery> Service<N, AD> {
 
 		let state = &mut self.state[peer_set];
 		// clean up revoked requests
-		let multiaddr_to_remove = state.previously_requested
+		let multiaddr_to_remove: HashSet<_> = state.previously_requested
 			.difference(&newly_requested)
 			.cloned()
 			.collect();
-		let multiaddr_to_add = newly_requested.difference(&state.previously_requested)
+		let multiaddr_to_add: HashSet<_> = newly_requested.difference(&state.previously_requested)
 			.cloned()
 			.collect();
 		state.previously_requested = newly_requested;
 
+		tracing::debug!(
+			target: LOG_TARGET,
+			?peer_set,
+			?requested,
+			added = multiaddr_to_add.len(),
+			removed = multiaddr_to_remove.len(),
+			?failed_to_resolve,
+			"New ConnectToValidators request",
+		);
 		// ask the network to connect to these nodes and not disconnect
 		// from them until removed from the set
 		if let Err(e) = network_service.add_to_peers_set(