This needs to cover the standard JON server/agent migration process, but also for specific subsystems that have significant changes between 2.3.1 and 3.0, such as the alerting framework.
Blocking install guide tracker.
As with previous migration scenarios, the migration from 2.3 to 2.4 will be entirely handled by dbupgrade, so the alert changes, etc., don't need to be done manually. Closing.