This is the largest single packet-delta sample UCS Manager observed among the sub-intervals making up the current reporting period. It matters on the live receive-side counter set UCS Manager keeps for one Ethernet endpoint (a blade's vNIC adapter port, an I/O Module uplink, or a fabric-interconnect server port) inside a UCS domain because it is the number that would actually cross a packet-rate alarm threshold even when the interval's average looks unremarkable. A totalPacketsDeltaMax of 45,000 against an average of 8,000 on this interface indicates one short-lived burst, not a sustained increase in traffic.