This read-only Counter64 reports the receive byte rate for this PM instance, sampled per second rather than accumulated over the whole bin. Because it is a rate rather than a running total, it is the field an admin actually watches on a live dashboard to catch a bandwidth spike the moment it happens, without waiting for the bin to close; 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, a live reading of 590,701,615 bytes/sec against a 10,000,000,000-bps port tells an admin roughly how close to full the link is running right now.