Airwave switch integration is very thin, whilst it cannot monitor it, you can set the switch to send traps to Airwave, create an Airwave trigger based on the poe threshold trap (and poe failure) which is sent as a deviceEvent, e.g.
deviceEvent "Event Contents" matches "Unrecoverable fault on PoE controller"
deviceEvent "Event Contents" matches "PoE usage has exceeded threshold"
hth