The object identifier of the particular variable to be sampled. Only variables that resolve to an ASN.1 primitive type of INTEGER (Integer32, Counter32, Gauge32, TimeTicks, Counter64, or UInteger32) may be sampled. If it is detected by an error response of authorizationError, noSuchObject, or noSuchInstance that the variable name of an established snmpAlarmEntry is no longer available in the sampling context, a single snmpObjectUnavailableAlarm event is generated and the status of this snmpAlarmEntry is set to `destroy'. Likewise, if the syntax of the variable retrieved by the query is not Integer32, Counter32, Gauge32, TimeTicks, Counter64, or UInteger32, the same actions will be taken. If the SNMPv2 entity acting in a dual role detects that the sampled value can not be obtained due to lack of response to management queries, it should either: 1) Set the status of this snmpAlarmEntry to `destroy', if it is determined that further communication is not possible; or, 2) Delete the associated snmpAlarmValue instance (but not the entire conceptual row), and continue to attempt to sample the variable and recreate the associated snmpAlarmValue instance should communication be reestablished. An attempt to modify this object will fail with an `inconsistentValue' error if the associated snmpAlarmStatus object would be equal to `active' both before and after the modification attempt.