Detect if a value hasnt changed for X time?

[ngvnate]

I have a UserParamater (PDFBatch_Unstarted) that returns an integer. I want to monitor the value and if its moving or not. Mostly, if it stops moving.
For example, if the integer stops changing for a period of 30min, I want a trigger to hit (and I'll attach an action to it). If the item has changed (up or down) over the last 30min, then I dont want a trigger to fire.

Do I need to use the .change() method? I'm honestly lost as to where to start here.
{SERVER:PDFBatch_Unstarted.change(0)}>0

Any guidance would be appreciated.

[addyrocker]

try using the delta trigger function

Returns the difference between the maximum and minimum values in a period ('max()' minus 'min()'). The period is set in seconds or as a number of collected values (preceded by a # hash mark) in the first parameter.
Since Zabbix 1.8.2, the function supports a second, optional parameter time_shift. See function avg for an example of its use.

give this a try

{SERVER:PDFBatch_Unstarted.delta(1800)}=0

[ngvnate]

Thank you! I think this will likely work. I'll return if I notice it's not triggering