[omd-users] writing a time series check

James Todd james.todd at jivesoftware.com
Tue Jun 7 16:37:54 CEST 2011


thx markus.

this route does provide maximum flexibility.

very much appreciated,

- james

On Jun 7, 2011, at 1:15 AM, Markus Joosten wrote:

James,

why not try a completely different approach?
Instead of parsing rrd-files, I'd suggest designing your plugin so that it writes the last captured value to a file and, during the next run, compares the historical value to the recent measured one.
I'd recommend to use a csv format for that, where you might also include a timestamp (or check the file's last modified time) to ensure the freshness of the historical data.

Hope that helps a bit!

Regards,
Markus

Am 07.06.2011 um 09:51 schrieb "James Todd" <james.todd at jivesoftware.com<mailto:james.todd at jivesoftware.com>>:


Hey Mathias -

  Based on a bit of searching, I believe what I am looking for is to execute an rrdtool.fetch(...) operation from within a check, passing along the correct rrd path.

  In searching through the default checks (as deployed via omd) i don't see any uses of rrd* from within the check scripts.

  Am I on the right path here? wrong path? regardless, I could use a pointer on how best retrieve historic data from within a check in order to perform a time-series
  calculation.

  thx in advance,

- james

On Jun 6, 2011, at 12:26 AM, Mathias Kettner wrote:

> Hi James,
>
> please have a look at this:
>
> http://mathias-kettner.de/checkmk_writing_checks.html>
> Am 05.06.2011 21:01, schrieb James Todd:
>>
>> hi -
>>
>>   i am new to omd/check_mk/nagios/python. i have the basics up and running and am collecting data from our application nodes. what i would like to now do is perform a time-series check and as such could use a pointer.
>>
>>   i am not sure "time series" check is the correct terminology so let me describe what i would like to achieve at a bit of a higher level, specifically:
>>
>>     for a given check "a"
>>     when this check is performed, i would like to retrieve previously captured values and perform a calculation against the set
>>
>>     eg: check if we counter-x has not increased more then y% over the last 30 minutes then return critical
>>
>>   i assume this is done via accessing the rrd data. i will continue to dig in and research but at the same token i very much appreciate more directed help those on this list can offer.
>>
>>   thx in advance,
>>
>> - james
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