You would do this:
1. Configure your controller to send syslog to your airwave server:
config t
logging <ip address of Airwave>
2. Setup a trigger that looks for the syslog message for an interface being down:
An interface down syslog message looks like this: (type show log network all)
Mar 19 19:27:00 :209801: <WARN> |fpapps| Physical link down: port 1/2
You would configure a trigger for that by looking for the words "Physical link down":