This is the propId property of a 64-bit threshold definition object, the definition of one 64-bit-valued statistics threshold, used for larger cumulative counters such as total bytes transferred, that belongs to a threshold policy, identifying which specific underlying statistics property this threshold definition monitors. UCS Manager uses this propId internally to bind the threshold's trigger logic to the correct counter, such as a particular power, thermal, or network statistic. For example, an admin auditing which counters have thresholds defined would read propId on each 64-bit threshold definition to confirm every critical statistic, like input power or link errors, is actually covered.