code: def _next_stalled_run(self):
      for run_hash in self._runs_with_progress():
          if self._is_run_stalled(run_hash):
              yield run_hash
  
imports: import contextlib
  import time
  import datetime
  import pytz
  import logging
  import os
  from threading import Thread
  from pathlib import Path
  from typing import Iterable
  from aim.sdk.repo import Repo
  from aim.sdk.run_status_watcher import Event
  from aim.storage.locking import RefreshLock
label_desc: Use image node_id 8 for calling the RepoIndexManager obj's underlying member method code with example usage: obj._next_stalled_run() without return types