Info from Chet:
>
> Due to the way the MIN/MAX are evaluated (min must always be less than max)
> it isn't possible to handle this with a DERIVE data point and a threshold.
> However, with the addition of an event class transform we can make this work.
>
> The first step is to create a threshold on this data point that will ALWAYS
> be violated. The easiest way to do this is to make the MIN = 1 and MAX = -1.
> Now you need to create the event class transform that will set the severity
> of these events to 0 (CLEAR) if the value is not 0.
>
> Let's say you created an event class called /Perf/MyCustom and are sending
> these threshold events to this class. Go to that event class, click its menu,
> choose more then transform. Put the following in the transform.
>
> import re
> match = re.search('threshold of [^:]+: current value -{0,1}([\d\.]+)',
> evt.message)
> if match and float(match.groups()[0]) != 0:
> evt.severity = 0
>
Corrected by me, was a " - should have been a '.
Added by me to handle negative changes.
You may also want to be careful about the decimal places as the event summary
which we're comparing to only shows 2 decimal places - the application we
monitor returns values to 12 decimal places so I had to add an RPN on the graph
point to multiply the value by 10000000000 (using the RPN: 10000000000,*) to
make sure the decimal places weren't ignored.
-------------------- m2f --------------------
Read this topic online here:
http://forums.zenoss.com/viewtopic.php?p=25547#25547
-------------------- m2f --------------------
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