class_docstr: Store information on generated alerts.
docstr: Read only property for rule name
docstr_tok: ["Read","only","property","for","rule","name"]
code: def rule_name(self):
      """Read only property for rule name"""
      return self._rule_name
  
file_path: streamalert/streamalert/rule_promotion/statistic.py
label_desc: Use image node_id 7 for calling the StagingStatistic obj's underlying member method code with example usage: obj.rule_name() and returns: self