Zabbix Trapper Macros

[zilla2000]

I'm trying to create a calculated item that takes the current value of itemA and subtracts it from the last(365) of itemA. So basically, I need to find the difference between the current value of an item and its value a year ago. I see this in the docs:

last("net.if.in[eth0,bytes]")+last("net.if.out[eth0,bytes]")


I haven't found anything that will calculate between different values of the same item, is this possible?

[ingus.vilnis]

Hello and welcome to Zabbix forums!

Here is the calculated formula that will return last value minus 365th value of itemA.

last("itemA")-last("itemA",#365)

Make sure itemA is updated only once a day since function last(#365) will count 365 values back.

Hope this helps!

Best Regards,
Ingus

[zilla2000]

Thanks for the reply ingus.vilnis. I'm still having an issue though. It's in a "Not supported" status with the error of "Cannot evaluate function [last(#365)]." Here's what I'm trying:

Type: calculated
Key: annual_usage.["{#USER}"]
Formula:

last("system.run[cat /usr/local/bin/text.dat | egrep {#USER} |awk '{print $4}']", 0)-last("system.run[cat /usr/local/bin/text.dat | egrep {#USER} |awk '{print $4}']",#365)


The individual item itself is working without issue. Do I need a custom user parameter key in order to make this work? I'm not sure if that's the issue or if it's a syntax issue. I'm pretty confident that there's at least 365 points of data collected though I'm not sure if there is a view where you can see the individual points.