passing FileTimerRequests.to_json() to log_debug_info_for_expired_tim…

…ers for a better debugging experience (pytorch#135913)

Summary: The change involves passing the expired timers to the log_debug_info_for_expired_timers function after to_json() has been applied . This change is made to provide a better debugging experience for the user.

Test Plan: unit tests

Reviewed By: gag1jain

Differential Revision: D62408767

Pull Request resolved: pytorch#135913
Approved by: https://github.com/gag1jain

torch/distributed/elastic/timer/file_based_local_timer.py

@@ -269,7 +269,7 @@ def _run_watchdog(self, fd: io.TextIOWrapper) -> None:
         log_debug_info_for_expired_timers(
             self._run_id,
             {
-                pid: self._get_scopes(expired_timers)
+                pid: [expired_timer.to_json() for expired_timer in expired_timers]
                 for pid, expired_timers in all_expired_timers.items()
             },
         )