What is proper way to define trigger expression for two consecutive measurements

[markosa]

Hi all,

I've been trying to define trigger expression which would trigger only when two consecutive (snmp polled)values are below threshold. My current solution is like: last(/device1/item1[{#INDEX},2])<last(/device1/threshold1[{#INDEX}]) and last(/device1/item1[{#INDEX},2],#2)<last(/device1/threshold1[{#INDEX}])
I've tried min() with time value larger than two polls but its not helping since it just takes lowest value and trigger fires...

Values are like(most recent first): 10, 15, 20, 10, 15, 18 and so on, threshold is set to (read from device) 15 and if two consecutive values are below threshold, trigger should fire.
Is my current solution only way solve this?

[Markku]

max(/host/item,#2) < your_threshold

will trigger if the last two values are both below the threshold value.

Markku

[superlava]

Yes, This trigger will fire when last values are less than threshold. You can also use avg here.

[superlava]

taking average of 2 values will solve your issue.

[markosa]

Yes, avg() is one way but it causes another problem, you need to define window from where to look and in case update interval is changed, trigger needs to be changed...

[superlava]

How often this item gets updated? Based on that you can set the trigger.

Further, You can set to check latest last values by appending # to time. Example avg(Key, #10). will revert avg of last 10 values.

Hope this help.

[Markku]

max(/host/item,#2) < your_threshold

will trigger if the last two values are both below the threshold value.

Markku

[superlava]

Yes, This trigger will fire when last values are less than threshold. You can also use avg here.

[Markku]

Average does not work here:

when two consecutive (snmp polled)values are below threshold

Example: threshold is 10, values are 7 and 11. max(#2) is 11 (not triggered, ok), avg(#2) is 9 (triggered, but not correct)

Markku

[superlava]

Thank You Markku. I was considering binary values only. I forgot about range of a values. markosa Go with max only