This read-only PerfCounter64 counts Frames Marked Yellow by this QoS policer, meaning frames that exceeded the committed rate but were still within the excess rate and thus marked for possible later discard under congestion. A growing yellow count without a corresponding rise in dropped yellow frames tells an administrator the customer is bursting above commitment but the network can currently still carry it. For example, seeing cmQosPolicerV2StatsFMY spike during a backup window would indicate the customer's traffic is regularly exceeding its committed rate at that time of day.