[AngryParsley]

It is nothing like Nagios. PagerDuty handles alerting, not monitoring. Once your monitoring system discovers something is wrong, it tells PagerDuty. PagerDuty then gets ahold of the right person. It lets you set up on-call rotations. It does automatic escalation if the primary contact doesn't acknowledge the incident. If your monitoring system supports it, it will even automatically resolve the incident once you fix your servers.

[cashmo777]

In point of fact, Nagios (which I use extensively) handles alerting, notification, auto escalations, acknowledgements, on-call rotations, and resets itself post incident. http://library.nagios.com/ Sounds like re-inventing the wheel for a well-solved problem.