This counter records the number of frames marked yellow and dropped in the ingress direction at this flow point during the archived historical interval. A nonzero historical value tells the admin that excess-rate traffic on this flow point was actually discarded, not just deprioritized, during that past period, which could explain a service issue reported from that time. For example, if a customer reported choppy video three days ago, the admin would check cmFlowPointHistoryFMYD for that interval to see whether yellow-marked frames were being dropped then.