Re: [opennms-devel] Collectd/threshd changes

[Rabie V. d. M. <rvd...@mh...>]

>> Just a thought, how would this impact complex thresholding (if at
all?)
>> In other words combing multiple data sources, performing some maths
on
>> it and then doing some evaluation against it.
>Not much; you are limited to only doing expressions within a given
>collectionset (i.e. within a node, interface, or resource), but I
*think* >that was a limitation before, and it's a fairly uncommon
requirement, I 
>would have thought.
Agreed, I would prob only ever do expressions on multiple datasources
within the same dataset (eg: Disktotal-DiskUsed=3DDiskFree Or CPU stats
etc etc)
so that's cool.


>> One feature that would be nice would be time based threshold or
>> trending.
>> Going back X minutes and getting an avg over Y minutes and then
>> comparing it against the current values, then alarm if it deviates by
>> more then Z thus proving some rudimentary trending. 
>Fairly easy to do; implement a new ThresholdStateEvaluator (I think
that's >the class name), and some code to instantiate, and tweak the
>thresholding.xsd to know about the new "type" of threshold.  I think;
I'm >not near the actual code today, so I may be talking rubbish,

I unfortunately can't code, so I would need to beg/borrow/steal/bride a
dev to write it for me, I was just curios as to the
limitations/extensibility of the new implementation. 

Regards
Rabie

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