Help Item

[Thomas51]

Hello,

I am trying to obtain the maximum measured time for a round trip. I saw that I need to use a calculated item. Here is the configuration:

Key: tcp.rtt.max
Formula: max("net.tcp.service.perf[tcp,80]", 300)

I am getting the error:
Cannot evaluate expression: function argument "net.tcp.service.perf[tcp,80], 300" is not a numeric value at "max("net.tcp.service.perf[tcp,80], 300)".

Can you help me?

[Hamardaban]

max(/host/net.tcp.service.perf[tcp,80], 300)

https://www.zabbix.com/documentation/current/en/manual/appendix/functions/aggregate#max

[Thomas51]

Hello,

Thank you, I tried to execute the command, but I got the error: "Cannot evaluate function: item '/host/net.tcp.service.perf[tcp,80]' does not exist at 'max(/host/net.tcp.service.perf[tcp,80], 300)'."

Do I need to add other parameters ?

[Thomas51]

Here is the screenshot :

[Hamardaban]

RTFM !!!!
/host/ - means the name of the host on which the data element exists "/test-ansimble3/net.tcp......."
if the formula is created on the same host, you can skip the hostname and write "//net.tcp......."

[Thomas51]

Sorry, I didn't see the link. Is it possible to use something like {HOST.NAME} to avoid creating an item for each machine? I tried using it without success

[cyber]

Sorry, I didn't see the link. Is it possible to use something like {HOST.NAME} to avoid creating an item for each machine? I tried using it without success

thats why templates are there...make once, apply to several...

[Thomas51]

Yes, that's what I did, but I can't manage to reproduce it as a template

[ISiroshtan]

It was already noted above, the "/test-ansimble3/net.tcp...." version would be taking data from specifically hardcoded host, no matter on which host you create this item. But if you want for item to calculate the value from data on the same host where item created use "//net.tcp...." version.

Examples:
Lets say you have host Test1.
You add calculated item on host Test1 with formula "/Test1/net.tcp...." - it will be taking data from Host1
You add another item on host Test1 with formula "//net.tcp...." - it will also be taking data from Host1

Now you create host named Test2
You add calculated item on host Test2 with formula "/Test1/net.tcp...." - it will be taking data from Host1!
You add another item on host Test2 with formula "/Test2/net.tcp...." - it will be taking data from Host2!
You add another item on host Test2 with formula "//net.tcp...." - it will be taking data from Host2(!!!)

You add another host named Test3
You add another item on host Test3 with formula "//net.tcp...." - it will be taking data from Host3(!!!)

[Thomas51]

Thank you for the response. I’m getting the following error: Invalid parameter '/1/params': incorrect expression starting from 'max(//net.tcp.service.perf[tcp,,80],10m

[ISiroshtan]

Thomas51 could you attach screenshots of both item you trying to use as basis for calculated item and screenshot of error (with item params visible) when creating the new calculated item.
Also kindly mention exact Zabbix version in use.

[Thomas51]

I’m using Zabbix 6.4

[Thomas51]

Here is the screenshot;

[ISiroshtan]

Tried to add similar item in my 6.4 and all went fine. Can you also show me the screenshot of existing item with key net.tcp.service.perf[tcp,,80],10m) ?

[Thomas51]

I updated the server, and that resolved the issue tranks