Shell script to poll the UniFi Controller API for the WiFi Experience. The script is called by the Zabbix Agent and the data is then returned to the Zabbix Server.
Place the shell script and conf file in the configuration directory of the Zabbix Agent.
Change the permissions so that the zabbix user can read the userparameter_unifi.conf file and read/execute the shell script.
Edit the zabbix_agent.conf file and modify the Include parameter to add the new userparameter_unifi.conf file.
Include=/etc/zabbix/userparameter_unifi.conf
Save and exit.
Restart the agent.
Add a template on the Zabbix Server that polls the agent to execute the script at desired interval.
A more thorough description can be found at : https://www.labeightyfour.com/2019/04/29/monitor-unifi-controller-values-using-zabbix-server-and-custom-templates/