add a single point of measuring timings

cumulus/client/relay-chain-rpc-interface/src/rpc_client.rs

@@ -168,9 +168,6 @@ impl RelayChainRpcClient {
 			hash
 		};
 
-		let _timer = self.metrics.as_ref().and_then(|inner| {
-			inner.start_request_timer(method_name, &[DURATION_LABEL_NAME, method_name])
-		});
 		let res = self
 			.request_tracing::<sp_core::Bytes, _>("state_call", params, |err| {
 				tracing::trace!(
@@ -194,10 +191,6 @@ impl RelayChainRpcClient {
 	where
 		R: DeserializeOwned + std::fmt::Debug,
 	{
-		let _timer = self
-			.metrics
-			.as_ref()
-			.and_then(|inner| inner.start_request_timer(method, &[DURATION_LABEL_NAME, method]));
 		self.request_tracing(
 			method,
 			params,
@@ -217,6 +210,11 @@ impl RelayChainRpcClient {
 		R: DeserializeOwned + std::fmt::Debug,
 		OR: Fn(&RelayChainError),
 	{
+		let _timer = self
+			.metrics
+			.as_ref()
+			.and_then(|inner| inner.start_request_timer(method, &[DURATION_LABEL_NAME, method]));
+
 		let (tx, rx) = futures::channel::oneshot::channel();
 
 		let message = RpcDispatcherMessage::Request(method.into(), params, tx);