Show values from items in trigger on calculated item

[Hakim013]

Hi,

I have 2 ITEMS that receive values. These values are used in a calculated ITEM.
I have created a trigger based on the calculated ITEM.

Is it possible to show the 2 ITEM values in the trigger?

[Hamardaban]

{ITEM.LASTVALUE}

→ Trigger-based notifications and commands → Problem update notifications and commands → Trigger names, event names, operational data and descriptions → Tag names and values → Trigger URLs7

The latest value of the Nth item in the trigger expression that caused a notification. It will resolve to *UNKNOWN* in the frontend if the latest history value has been collected more than the Max history display period time ago (set in the Administration->General menu section). Note that since 4.0, when used in the problem name, it will not resolve to the latest item value when viewing problem events, instead it will keep the item value from the time of problem happening. Supported since 1.4.3. It is alias to {{HOST.HOST}:{ITEM.KEY}.last()}. Customizing the macro value is supported for this macro; starting with Zabbix 3.2.0. This macro may be used with a numeric index e.g. {ITEM.LASTVALUE<1-9>} to point to the first, second, third, etc. host in a trigger expression. See indexed macros.

[Hakim013]

@Hamardaban I'm not sure why you would just paste excerpt from Zabbix help. As I already read it.
Do you understand that I want the values from the items USED in the calculated item.

So if ITEM1 values = 1 and ITEM2 value = 2
The calculated ITEM shows value 3

I want the trigger on the calculated ITEM to show value 1 and 2

Your solution will only show the value 3

[Hamardaban]

I understand your question.Do you understand the documentation?
In short - there is no possibility.
Or do you think that the developers have hidden from you this most necessary feature?

[Hakim013]

My Appologies. I was hoping the community had some kind of workaround.
Thanks anyway.

[Hamardaban]

Unfortunately, not everything can be done... Do not despair! I am sure that your task can be changed and a solution can be found in a different plane. :-)

[[email protected]]

Hi Hakim013,

The work around that I have always found to work is to use those items in the trigger expression and ensure that they will always evaluate to true for example:

New Zabbix Trigger Format -

nodata(/Template XXXX/item_one,1)>=0
and
nodata(/Template XXXX/item_two,1)>=0
and
last(/Template XXXX/calculated_item,#1)>1000

Old Zabbix Trigger Format -

{Template XXX:item_one.nodata(1)}>=0
and
{Template XXX:item_two.nodata(1)}>=0
and
{Template XXX:calculated_item.last(#1)}>1000

NOTE: nodata() returns a 0 or 1 so if you use >=0 it is always true

This does have ramifications on the time the triggers are evaluated I believe for example time based triggers are evaluated every 30 seconds where non-time based triggers are evaluated upon item arrival.

So you want to make the trigger functions as lean as possible and always ensure they are true which is why I use either "nodata(1)>=0" or "count(1)>=0"

Once you do the above you can do the normal thing in your trigger description i.e. {ITEM.VALUE1}, {ITEM.VALUE2}, {ITEM.VALUE3}.

What would be nice and probably needs a feature request, is in the trigger description that you would be able to just specify something like:

last(/Template XXXX/item_one,#1)
last(/Template XXXX/calculated_item,#1)
last(/Template XXXX/calculated_item,#1)

OR

last(/Host XXXX/item_one,#1)
last(/Host XXXX/calculated_item,#1)
last(/Host XXXX/calculated_item,#1)

Anyway hope this helps...