This object indicates the entity that caused the event.
If the alarm condition has an association with a flow monitor,
then the value of this column is a row in the
cfmFlowMonitorTable.
If the alarm condition has an association with a traffic flow,
then the value of this column is a row in the cfmFlowTable.
If the alarm condition has an association with a alarm group,
then the value of this column is a row in the
cfmAlarmGroupTable.