code: public java.util.List<AlarmHistoryItem> getAlarmHistoryItems() {
          if (alarmHistoryItems == null) {
              alarmHistoryItems = new com.amazonaws.internal.SdkInternalList<AlarmHistoryItem>();
          }
          return alarmHistoryItems;
      }
docs: <p>
  The alarm histories, in JSON format.
  </p>
  
  @return The alarm histories, in JSON format.