Add CloudWatch alarms by default for AWS instances

[johnnyshields]

By default, Rubber should set sensible CloudWatch alarms when a new instance is added. (At least the basic "Status = Failed" one.) Forgot to add this on one of my hosts and got an unpleasant surprise today when AWS crashed.

[onyxraven]

Yeah, I regularly add the Status any failed 2x over 5 mins (get a small number of false positives on the reachability test on older hosts).

It'd be very cool to auto-add/remove alarms on hosts in the general sense (cpu usage, etc), so maybe add functionality to the rubber host config to add them? I haven't looked at what the API looks like for managing cloudwatch alarms.

[nirvdrum]

I'll have to see what fog provides in this area. I looked at adding monitoring years back via Zerigo, but they never released their API for it.