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 lifetime bin, which keeps accumulating until an operator explicitly clears it, a sudden plateau on an otherwise busy instance is itself a signal — most likely that someone cleared the stats rather than that traffic actually stopped. On a 100 Mbps residential broadband EFP, a live reading of 53,960,916 bytes/sec against a 100,000,000-bps port tells an admin roughly how close to full the link is running right now.