Add node authority status metric

node/network/gossip-support/src/metrics.rs

@@ -33,6 +33,12 @@ struct MetricsInner {
 }
 
 impl Metrics {
+	#[cfg(test)]
+	/// Dummy constructor for testing.
+	pub fn new_dummy() -> Self {
+		Self(None)
+	}
+
 	/// Set the authority flag.
 	pub fn on_is_authority(&self) {
 		if let Some(metrics) = &self.0 {

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

@@ -126,7 +126,11 @@ async fn get_other_authorities_addrs_map() -> HashMap<AuthorityDiscoveryId, Hash
 }
 
 fn make_subsystem() -> GossipSupport<MockAuthorityDiscovery> {
-	GossipSupport::new(make_ferdie_keystore(), MOCK_AUTHORITY_DISCOVERY.clone())
+	GossipSupport::new(
+		make_ferdie_keystore(),
+		MOCK_AUTHORITY_DISCOVERY.clone(),
+		Metrics::new_dummy(),
+	)
 }
 
 fn test_harness<T: Future<Output = VirtualOverseer>, AD: AuthorityDiscovery>(