Add a simple agent plugin that polls the Monitoring API for the latest s...

...tate of a given alarm, and emits 1 if it is OK, else 0.

The main purpose of this would be to push additional metrics based on the state of alarms into the metrics system. The immediate use case I have in mind is graphing whether or not my webpage was returning a proper status code. This would look at an alarm that returns OK if the status code is 200, else return CRITICAL.