Setting this CienaStatsClear object to clear(1), per its DESCRIPTION, wipes the last-Adjustment-TCA and last-Alert-TCA history records for this PM instance -- the timestamped snapshots such as cienaCesPmAdjustmentTcaLastIntvlEndTcaTime and its associated basis/threshold/boundary values -- as distinct from the running event counters that the sibling TcaStatisticsClear object resets. Splitting history-clear from statistics-clear like this lets an operator archive or acknowledge the details of the most recent TCA event (say, after investigating it) and reset the 'last event' record to a clean slate, while still keeping the lifetime count of how many TCA events have ever fired on cienaCesPmAdjustmentTcaEventsTotal. For example, after confirming that the most recent Adjustment TCA was caused by a known, now-resolved fiber issue, an operator clears this so a future dashboard doesn't keep pointing back at that stale incident as if it were still the most recent one.