This read-only VariablePointer holds the object identifier of the specific probe-statistics variable being sampled for threshold monitoring, restricted per its description to objects in the esaProbeStatsTable that resolve to an INTEGER-family type such as INTEGER, Integer32, Counter32, PerfCounter64, Gauge, or TimeTicks. An administrator sets up such a pointer to have the device automatically watch a chosen SLA metric (like a delay or loss counter) against a threshold rather than polling it manually. For example, esaProbeStatsThresholdVariable might point at a probe's round-trip-delay counter object so an alert fires automatically when that counter crosses the configured limit.