Alerting on 'rate' thresholds

[Nathan Ward]

I'd like to use nagios to monitor things like octets transferred on an 
interface per second, and other things that are typically constantly 
incrementing counters.

I am looking at using the nagios performance data framework for putting 
data in to RRD for graphing, which enables several possible ideas: - 
Write a wrapper around each of the checks that return this performance 
data, which knows how to read a value from RRD and compare it against a 
threshold. Of course, this means that I am checking data that is >= 
normal_check_interval old, not the data I have just read.
- Set up another service for each rate threshold I want to monitor, 
which runs a script to do the above test on an RRD. This means that the 
data I am checking is <= normal_check_interval. Still, it's not the 
most up to date data.

Ideally, I'd like to run a check script right after the performance 
data command (ie inserting data in to RRD) has been run.
Any bright ideas?
What about cricket?
How are other people monitoring 'rate' thresholds?

--
Nathan Ward



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