One call, two items.

[StefTresMan]

Hi All,

I currently am monitoring temperature and humidity loggers through a script. What I do there is solved thanks to the community in this post: https://www.zabbix.com/forum/zabbix-...telnet-session

The script is called from userparameters in Zabbix agent. Works perfectly. The thing is, these logger give status of temperature and humidity in one call. The BASH-script opens a socket to the logger, sends a command, receives a reply. The reply contains both temperature AND humidity information, and when i run the script, i filter the information sent to zabbix by commandline parameters: -t returns temp, -h returns humidity.
So i run the script twice to get temperature and humidity, script filters the data and returns HUM or TEMP.

In the Zabbix template I have created 2 items: temperature and humidity, each an other userparameter defined in the zabbix_agentd.conf file

Is it possible in Zabbix to let the script run only once and get the data into two different items? I can let the script return eg CSV for the two metrics. (item preprocessing???)
So one userparameter that calls the script, and and two Items returned? Now i have to run it twice while the needed data is returned in one response, doubling the network overhead to derive this data since i have to open the socket twice. And in my measurements i sometimes have 'NaN' results because Zabbix calls the script twice, but can't derive the data because the socket is still open from the previous call..

[Hamardaban]

Helo again. :-)
You write a script that returns json with temperature and humidity.
Make one master item (without saving history) and 2 items dependent on it.
In dependent item in preprocessing, use JSONPATH and get the desired values.

all information is here

https://www.zabbix.com/documentation/current/en/manual/config/items/itemtypes/dependent_items

https://www.zabbix.com/documentation/current/en/manual/config/items/preprocessing/jsonpath_functionality

[Hamardaban]

Helo again. :-)
You write a script that returns json with temperature and humidity.
Make one master item (without saving history) and 2 items dependent on it.
In dependent item in preprocessing, use JSONPATH and get the desired values.

all information is here

https://www.zabbix.com/documentation/current/en/manual/config/items/itemtypes/dependent_items

https://www.zabbix.com/documentation/current/en/manual/config/items/preprocessing/jsonpath_functionality

[StefTresMan]

Hi Hamardaben,

Thank you for helping me out again! I will look into it and see how it goes - will keep you posted.

[StefTresMan]

I managed to do it like this:

Rewrote the script so it is called with only commandline parameter IP. Script returns both temerature and humidity seperated by a comma: 21.3,41.7. Created a maser item that calls the script, and the created 2 dependent items where i derive the values with javascript:

temp = value.split(",")[0];
val = parseFloat(temp);
return val;

since the script returns text, and temperature is a float, i also used the parseFloat object.
For humidity:

temp = value.split(",")[1];

Works like a charm. Thanks again, Hamardaban ! You got me in the right direction again. Next thread is on it's way