anchor.diff:  
       services.zabbixServer.dbPassword = mkOption {
         default = "";
  +      type = types.str;
         description = "Password used to connect to the database server.";
  +    };
  +
  +    services.zabbixServer.extraConfig = mkOption {
  +      default = "";
  +      type = types.lines;
  +      description = ''
  +        Configuration that is injected verbatim into the configuration file.
  +      '';
       };
   
     };
  
positive.code: 
      services.zabbixServer.dbServer = mkOption {
        default = "localhost";
        description = ''
          Hostname or IP address of the database server.
          Use an empty string ("") to use peer authentication.
  
negative.code: 
      services.zabbixServer.enable = mkOption {
        default = false;
        type = types.bool;
        description = ''
          Whether to run the Zabbix server on this machine.
        '';
  