fix: ignore send error if no subscribers

api/bin/chainflip-ingress-egress-tracker/src/main.rs

@@ -322,7 +322,14 @@ async fn main() -> anyhow::Result<()> {
 			}
 		}
 	});
-	let server = ServerBuilder::default().build("0.0.0.0:13337".parse::<SocketAddr>()?).await?;
+	let server = ServerBuilder::default()
+		// It seems that if the client doesn't unsubscribe correctly, a "connection"
+		// won't be released, and we will eventually reach the limit, so we increase
+		// as a way to mitigate this issue.
+		// TODO: ensure that connections are always released
+		.max_connections(1000)
+		.build("0.0.0.0:13337".parse::<SocketAddr>()?)
+		.await?;
 	let mut module = RpcModule::new(());
 	module.register_async_method("status", move |arguments, _context| {
 		let cache = cache.clone();

api/bin/chainflip-ingress-egress-tracker/src/witnessing.rs

@@ -103,7 +103,11 @@ pub(super) fn start(
 					move |call: state_chain_runtime::RuntimeCall, _epoch_index| {
 						let witness_sender = witness_sender.clone();
 						async move {
-							witness_sender.send(call).unwrap();
+							// Send may fail if there aren't any subscribers,
+							// but it is safe to ignore the error.
+							if let Ok(n) = witness_sender.send(call) {
+								tracing::info!("Broadcasting witnesser call to {} subscribers", n);
+							}
 						}
 					}
 				};