Dynamic warning/critical thresholds

[Jonathan Gazeley]

I've got a bunch of Nagios plugins that monitor things like 
DNS/HTTP/RADIUS hits per second.

I've set what I believe to be sensible max/min warning thresholds but 
what I really want is dynamic thresholds. If some quantity suddenly 
doubles or halves, I'd like an alert.

For example, if I usually serve 10 DNS lookups per second, and suddenly 
it is doing 20 per second, that isn't a "fault" but I would like to know 
about it, because it might mean there is a problem with the network in 
general.

Is there a way of doing this?

Thanks,
Jonathan

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