Merge pull request #318282 from Ma27/fix-zabbix-proxy-option

        port = mkOption {

          type = types.port;

          default = if cfg.database.type == "mysql" then mysql.port else pgsql.services.port;

          default = if cfg.database.type == "mysql" then mysql.port else pgsql.settings.port;

          defaultText = literalExpression ''

            if config.${opt.database.type} == "mysql"

            then config.${options.services.mysql.port}