message: make log msg more informative
diff: @@ -233,7 +233,7 @@ where
  match self.try_next_request()? {
  Some((_req, span, resp_tx)) => {
  let _span_guard = span.enter();
  - info!("rejecting request");
  + info!("rejecting outdated request");
  let _ = resp_tx.send(Err(RequestError::MessageRejected));
  metrics!(
  