Steps to reproduce:

1. Open documentation: https://github.com/zabbix/zabbix/tree/master/templates/db/mysql_agent2
2. Install MySQL 8.0
3. Try to monitor

Result:

1. Which URI schema should i use? Modern MySQL X is not supported:
   
2. How should i setup connection?
   
3. https://github.com/zabbix/zabbix/tree/master/src/go/plugins/mysql:
   

Expected:

1. correct schema URI description
2. known limitations/how to find obsolete socket (not socket X)
3. examples with remote/localhost connections