This is a simple true/false flag stating whether the historical performance data stored for a particular 15-minute interval bucket in this pseudowire's history table is trustworthy, as opposed to incomplete because of a counter reset or device restart mid-interval. Automated reporting tools must check this flag before including an interval's packet/byte counts in a trend graph, since including invalid intervals would silently corrupt throughput averages. If a router reloaded three intervals ago, this flag for that specific historical bucket would read false(2), telling the polling system to skip it.