This enumerated value (CucsMemoryUnitEnvStatsHistThresholded) reports which of the numeric fields in this memory unit's (DIMM's) historical temperature stats record have crossed a configured alarm threshold, per its thresholded property description. It gives an admin a single field to check instead of comparing every counter in the memory unit's (DIMM's) historical temperature stats table against its own limit to see if something needs attention. A value of 0 means nothing is out of range, while a nonzero bitmask flags exactly which of this record's counters (say, temperature or an error count) breached its threshold.