[collectd] flapjack integration

[Marc Fournier]

Excerpts from Oğuz Yarımtepe's message of 2014-10-15 10:12:52 +0200:
> 
> I am also planning to combine health check mechanism with collectd and
> write custom
> plugins for checking whether a required service is working or not. Any one
> of you did this with collectd or any suggestions to how to do it?

Collectd's threshold plugin has various ways to send out notifications
when collected values go out of range or stop receiving updates. See:
https://collectd.org/documentation/manpages/collectd-threshold.5.shtml

Marc