Comment 12 for bug 1799406

Ok a little progress, value:

value=Event <id=fa2a8295-e609-48f2-af6e-13c3219d1a9b,event_type=compute.instance.power_on.start> hits the query <query=[]>.

is coming from aodh/evaluator/event.py:

    def _fire_alarm(self, alarm, event):
        """Update alarm state and fire alarm via alarm notifier."""

        state = evaluator.ALARM
        reason = (_('Event <id=%(id)s,event_type=%(event_type)s> hits the '
                    'query <query=%(alarm_query)s>.') %
                  {'id': event.id,
                   'event_type': event.get_value('event_type'),
                   'alarm_query': json.dumps(alarm.obj.rule['query'],
                                             sort_keys=True)})
        reason_data = {'type': 'event', 'event': event.obj}
        always_record = alarm.obj.repeat_actions
        self._refresh(alarm.obj, state, reason, reason_data, always_record)