def METHOD_NAME(self, user_id: str) -> None:
    """Notify listeners about a push rule change.
    Args:
        user_id: the user ID the change is for.
    """
    stream_id = self._main_store.get_max_push_rules_stream_id()
    self._notifier.on_new_event("push_rules_key", stream_id, users=[user_id])