[Observium] alerts examples / service monitoring

Hey guys, i am trying to set a group alarm where all my routers are on it. But I am not able to have it set correctly, and in the alerts configurations webpage is not clear enough. Can you please help me on how to set an alarm for any item on a group when a router is down? Also, is there some other page to learn about alarm creations?

Also, now that I am sending this email, I need to check services (apache / sql / etc) I saw there was a couple of scripts to be set into the snmp.conf file, how can I create other to monitor different services?

Thanks in advace!!!