class_docstr: Store information on generated alerts.
code: def __bool__(self):
      return self.alert_count not in {0, self._ALERT_COUNT_UNKOWN}
  
file_path: streamalert/streamalert/rule_promotion/statistic.py
label_desc: Use image node_id 2 for calling the StagingStatistic obj's underlying member method code with example usage: obj.__bool__() and returns: unknown