calculated items

[rsokoll]

Hi,

I want to know how many incoming bytes have crossed my router's eth0 within the last 30 days.
From my understanding, I need a calculated item that substracts the value of last(//net.if[eth0],30d) from last(//net.if[eth0]), but that raises a syntax error:

Incorrect value for field "Formula": invalid second parameter in function "last".

My formula is

last(//net.if[eth0]) - last(//net.if[eth0],30d)

What am I missing?

[Brambo]

I think you should have

sum(last(//net.if[eth0]) - last(//net.if[eth0],30d))

[cyber]

I think you should have

sum(last(//net.if[eth0]) - last(//net.if[eth0],30d))

That is pretty useless ... as it is wrong from the start...

you have to remember that "last" is kind of special needs kid.. you cannot use last(/host/item,1d) to refer to a value one day ago... last has only "#num (optional) - the Nth most recent value". no "seconds" option..
so if you want to refer to a value X time ago, you need to use time shift (last (/host/key,<#num<:time shift>>)) https://www.zabbix.com/documentation...ion#time-shift
I think "last(//net.if[eth0]) - last(//net.if[eth0],#1:now-30d)" should work...