add warning

Signed-off-by: Timothy Seah <tseah@anyscale.com>

Author: TimothySeah

torchft/manager.py

@@ -733,6 +733,11 @@ def _async_quorum(
                     # Only reset FR recording if available (requires NCCL Flight Recorder support)
                     if hasattr(torch._C._distributed_c10d, "_reset_fr_recording_nccl"):
                         torch._C._distributed_c10d._reset_fr_recording_nccl()  # pyre-ignore
+                    else:
+                        self._logger.warn(
+                            "Unable to reset NCCL flight recorder recording so traces will be "
+                            "incorrect."
+                        )
             except Exception as e:
                 self._logger.exception(f"got exception in pg configure: {e}")
                 self.report_error(e)