This counter records the number of frames discarded by ACL rules in the ingress direction at this flow point during the archived historical interval. A historical rise helps the admin date exactly when an ACL began actively blocking a customer's ingress traffic on this flow point, useful for correlating with a recent policy change. For example, if a customer's application traffic started failing three days ago, the admin would check cmFlowPointHistoryFACLD from that period to see if ACL discards on their flow point began around that time.