[Logging] Fix log monitor issue (#12588)

* Try fixing issues.

* Verficiation.

python/ray/log_monitor.py

@@ -133,7 +133,7 @@ class LogMonitor:
                 job_match = JOB_LOG_PATTERN.match(file_path)
                 if job_match:
                     job_id = job_match.group(2)
-                    worker_pid = job_match.group(3)
+                    worker_pid = int(job_match.group(3))
                 else:
                     job_id = None
                     worker_pid = None
@@ -361,4 +361,5 @@ if __name__ == "__main__":
                    f"failed with the following error:\n{traceback_str}")
         ray.utils.push_error_to_driver_through_redis(
             redis_client, ray_constants.LOG_MONITOR_DIED_ERROR, message)
+        logger.error(message)
         raise e