max_input_vars PHP variables controls how many GET variables can be passed, by default value is 1000. It is better to document some notes about the value (especially on huge installations) and add the value to packages by default (Zabbix virtual host configuration config file). I suppose 10000 GET variables are enough.

Regarding packages, for example "For RHEL 7 and later the Apache configuration file for Zabbix frontend is located in /etc/httpd/conf.d/zabbix.conf."