I made a zabbix template and scripts for my OpenVPN server. This template generates VPN users (as discovered nodes) from certificate list. Every node is monitored for traffic, up/down, uptime. All users are placed in VPNUsers group.
I'm trying to make trigger to raise alert when new users added or removed. I studied documentation and found groupsum function, but can't figure out how use it to compare current sum and previous.
Is it possible ?
The discovery part was not clear to me, but grpsum is an aggregate item function. The values would be stored in an item, and then on top of that you'd create a trigger with, for example, abschange()<>0 trigger function.