rpc/server: Print info log on client disconnect

src/rpc/server.rs

@@ -287,6 +287,7 @@ async fn run_accept_loop(
                 task.clone().start(
                     accept(reader, writer, url.clone(), rh.clone(), conn_limit, ex_),
                     |_| async move {
+                        info!(target: "rpc::server", "[RPC] Closed conn from {}", url);
                         rh_.clone().unmark_connection(task_.clone()).await;
                     },
                     Error::ChannelStopped,