This read-only Counter64 counts bytes received on this PM instance that the switch discarded outright, rather than forwarding or yellow-marking them. This is the counter an admin escalates on — sustained non-zero drops mean traffic on this flow point exceeded even the excess-rate allowance or hit a policy/resource limit, and whatever service rides this instance will show real loss; because it is drawn from the most recently completed 24-hour bin, frozen once the day rolled over, it is frozen and safe to use for day-over-day comparison, since no further traffic will ever be added to it. On a 10 Gbps wholesale handoff port, this might read 7,370,000,000 bytes over yesterday's completed 24-hour window — a number an admin would divide by the bin length to sanity-check it against the port's 10,000,000,000-bps ceiling.