I talk about this one: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/zabbix_proxy?at=refs%2Fheads%2Frelease%2F7.0

at first the easy part: in the README.md are missing some Macros

second part: there is a "Zabbix proxy check" which check how many triggers are there (but why this to identify a server or a proxy? better would be lenght of $data.proxy.leght()). However..  you check in range to max 0, this looks like that it always triggers this.