Tech - Doctors: SetUp alert on Data dog [#52116285]

Pivotal tracker story [#52116285](http://www.pivotaltracker.com/story/show/52116285) in project *Tech - Doctors*:

> Set Up alert on datadog to notify developers by email when Integrity autoscaling mechanism breaks.
> 
> Metric should be something like:
> When system load is close to 0 for some time (~ 30 minutes?) then we should send notification.
> 
> To test:
> Turn off scheduler on master instance for some time.