Configure a Listener to Receive Management Subsystem Notifications
I believe this is about EAP7-471/472.
A better title is "Configure a Listener to Receive Notification of Server Lifecycle Events". Then, "In JBoss EAP 7.1, you can configure a Listener to receive notifications from the Management system of server and host controller lifecycle events."
EAP7-471/472 is not a generic management notification facility and isn't about notifications from subsystems. The kernel management layer also shouldn't be referred to as a subsystem as the word has an important more precise meaning in EAP.