Hello, my Zabbix server is already monitoring a couple of servers that have MySQL, the template “MySQL by Zabbix agent” is simply assigned there and macros are not configured, but it is monitored successfully, I set up monitoring of authoritative PDNS server in the same way, it has a MySQL database but, I get the following error “MySQL: Failed to fetch info data (or no data for 30m)”, as I understand it, I can monitor without setting up macros (because the above servers are configured without a macros), but why can’t you set up a new server? 

The discovery rules have active rules "MySQL by Zabbix agent: MySQL: Version: MariaDB discovery"