Checks that compare previous values

[Jee Kay]

Is there some way to make checks compare the value they've retrieved
against the previous value of that service?

Specifically, I would like to be able to alert on excessive throughput
on some switchports. The obvious way to do this is check the inOctets
every minute and compare the value just retrieved against the last
value; if that *8/60 is more than a certain amount then we need to
alarm.

A rough timeline would be:

000 seconds: Check; gets 150. No previous value - ignore completely.
060 seconds: Check; gets 300. Total bytes passed in the last minute = 150. OK.
120 seconds: Check; gets 3000000. Total bytes passed in the last
minute = too many. WARNING.


Is there any functionality in Nagios that would make this sort of
thing easy, or do I need to write a wrapper of some description for
this?

Thanks in advance,
Ras


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