This object indicates whether the collected Quality-of-Service (QoS) shaper performance data in a historical time bin is valid and reliable for analysis. If set to true, the performance metrics (such as throughput, drops, and delays) for that interval are complete and can be used for trending; if false, the data may be incomplete or corrupted. An operator uses this flag when reviewing historical QoS statistics to determine which time periods have accurate rate-limiting measurements.