Hello,
SCOM 2007 provided ability to create custom services and health models. As far as I can understand there was special features to create various types of discoveries. For SCOM 2007 it described in Management Pack Authoring Guide, Service model section (Creating Discoveries).
Unfortunatelly I can't find anything about discovery that related to SCOM 2012. Is this feature still available or not?
Regards, Adnrew.