This counter records the number of frames the access port's shaper discarded via Random Early Discard during the archived historical interval. A historical value here shows the admin that the port was proactively shedding traffic to avoid full-queue congestion during that past period, which is a milder congestion signal than tail drops. For example, an admin building a weekly congestion report for an access port would total cmAccPortQosShaperHistoryFREDD across the week's daily bins to gauge sustained congestion pressure.