This PerfCounter64 counts Frames Random Early Discard, Dropped by a QoS Shaper in the history bin. An admin checks historical frame-count RED drops alongside byte-count RED drops to understand whether dropped traffic in a bin was mostly small frames or larger ones, which affects how the customer experiences the drops. If f3FpQosShaperHistoryFREDD is high but f3FpQosShaperHistoryBREDD is comparatively low for the same bin, the admin infers the drops mostly hit small frames such as VoIP packets, which is more service-affecting than the byte count alone suggests.