If you would consider writing a nagios check plugin that connects to wowza and verifies that it is sober and ready to serve that would be great. Please consider this.
I have been looking around for any rtmp or wowza spesific nagios check with no luck this far and it seems to me that you guys with your intimate knowledge of rtmp and wowza it would be fairly quick to create such a check.
Update: I did read the post about nagios checks from 8th jan. However what were suggested in that post is not the same thing as interacting with the wowza server using the rtmp protocol.