This counter tracks DHCPACK packets sent by the server, each representing a lease successfully confirmed and handed to a client, making it the clearest single number for how many clients have actually been assigned a working address from this server. An admin monitoring overall DHCP health would watch this counter's growth rate as the practical measure of successful lease activity, distinct from Offers or Requests which can occur without a final Ack. For example, a pool serving 50 phones that reboot nightly would show roughly 50 new Acks each night as leases are renewed or reassigned.