Decommissioning Core server

Hi.

I am in the process of migrating all devices from one core to another (different host, different DB).

Following the old server shuting down, we will have a dns record that points to the new core. So any old agent will be reporting to the new core, waiting for me to upgrade the agent.

Is there anything particular to do when decommissioning the old core i.e. deactivate Landesk licences?