This counter reports the total bytes of ingress traffic on this PM instance that exceeded even the excess rate and were outright discarded, during a completed prior day (for example the 24 hours of August 5th). Any nonzero value accumulated over that completed day represents traffic this specific service actually lost at ingress due to rate policing, which is a direct, quantifiable cause for a customer's throughput or application-quality complaint on this port, distinct from congestion elsewhere in the network. For example, if this counter shows 50,000 dropped bytes within that completed day right when a customer reports a large file transfer stalling, that strongly suggests their traffic burst past the service's excess rate rather than the file server itself being at fault.