This read-only counter tracks the total number of bytes that have matched a specific ACL rule, giving a volume-based companion metric to the packet-count statistic for the same rule. An administrator uses this alongside extremeAclStatsPktCount to gauge not just how many packets a rule affects but how much actual bandwidth is involved, useful for spotting whether a matching rule is catching a few large flows or many small ones. For example, a high byte count with a relatively low packet count on a rule would suggest it's matching large packets, such as bulk file transfers, rather than small control-plane traffic.