fix(subscription): do not log an error when the websocket stream has been interrupted, keep it in trace level to avoid useless noises (backport #8344)

.changesets/fix_bnjjj_fix_error_log_subs.md

@@ -0,0 +1,5 @@
+### fix(subscription): do not log an error when the websocket stream has been interrupted, keep it in trace level to avoid useless noises ([PR #8344](https://github.com/apollographql/router/pull/8344))
+
+Convert log from `error` level to `trace` when the websocket stream has been interrupted to avoid useless noises.
+
+By [@bnjjj](https://github.com/bnjjj) in https://github.com/apollographql/router/pull/8344

apollo-router/src/protocols/websocket.rs

@@ -383,7 +383,7 @@ where
             }
             Ok(Message::Frame(frame)) => serde_json::from_slice(frame.payload()),
             Err(err) => {
-                tracing::error!("cannot consume more message on websocket stream: {err:?}");
+                tracing::trace!("cannot consume more message on websocket stream: {err:?}");
 
                 Ok(ServerMessage::Error {
                     id: id.to_string(),