This read-create TruthValue turns on or off a packet counter that tracks how many packets have matched this specific class map's rules. An admin enables this to verify a class map is actually catching the traffic it was designed for, useful when validating a new QoS policy before trusting it in production. For example, after deploying a new 'VOICE' class map, the admin enables this counter and checks it climbing as expected to confirm real voice traffic is being classified rather than falling through to a default class.