feat: measured oneshots (#3902)

* overseer: remove mut in connector

* monitored oneshots

* fmt

* remove debug log

* Update node/metered-channel/src/oneshot.rs

Co-authored-by: Andronik Ordian <write@reusable.software>

* Update node/metered-channel/src/oneshot.rs

Co-authored-by: Andronik Ordian <write@reusable.software>

* avoid two Arcs

* add expects

* alt impl

* rework the measured oneshots

* address review comments, use `Measurable` where possible

* chore/tracing: move `PrettyAuthorities` construction out of tracing macros

Co-authored-by: Andronik Ordian <write@reusable.software>

polkadot/node/network/gossip-support/src/lib.rs

@@ -340,12 +340,13 @@ where
 				"Connectivity seems low, we are only connected to {}% of available validators (see debug logs for details)", connected_ratio
 			);
 		}
+		let pretty = PrettyAuthorities(unconnected_authorities);
 		tracing::debug!(
 			target: LOG_TARGET,
 			?connected_ratio,
 			?absolute_connected,
 			?absolute_resolved,
-			unconnected_authorities = %PrettyAuthorities(unconnected_authorities),
+			unconnected_authorities = %pretty,
 			"Connectivity Report"
 		);
 	}

polkadot/node/network/gossip-support/src/tests.rs

@@ -340,9 +340,10 @@ fn test_log_output() {
 		m.insert(bob, addrs);
 		m
 	};
+	let pretty = PrettyAuthorities(unconnected_authorities.iter());
 	tracing::debug!(
 		target: LOG_TARGET,
-		unconnected_authorities = %PrettyAuthorities(unconnected_authorities.iter()),
+		unconnected_authorities = %pretty,
 		"Connectivity Report"
 	);
 }