This read-only true/false object indicates whether the performance monitoring data bin for this interval is valid, per the description. Admins check this before trusting any of the counters in the same row, since an invalid bin, for example from a reset or incomplete collection period, would make the associated statistics unreliable. For example, after a device reboot mid-interval, an admin would expect this object to read false for that partial bin and would exclude it from trend analysis.