Zabbix Course : https://sbcode.net/zabbix/
Coupons : https://sbcode.net/coupons
In this video I use the agent running on my Zabbix Server to query days remaining before SSL expiry of external websites by creating a custom script and executing it using the system.run item key option.
The commands used in the course can be copy/pasted from
https://sbcode.net/zabbix/system-run/
For more info on my Zabbix Course visit https://sbcode.net/zabbix/