anchor.diff:    pluginPath = lib.concatStringsSep ":" cfg.plugins;
     havePluginPath = lib.length cfg.plugins > 0;
     ops = lib.optionalString;
  +  verbosityFlag = {
  +    debug = "--debug";
  +    info  = "--verbose";
  +    warn  = ""; # intentionally empty
  +    error = "--quiet";
  +    fatal = "--silent";
  +  }."${cfg.logLevel}";
   
   in
   
  
positive.code:         default = [ ];
          example = literalExample "[ pkgs.logstash-contrib ]";
          description = "The paths to find other logstash plugins in.";
        };
  
        watchdogTimeout = mkOption {
  
negative.code:           "${cfg.package}/bin/logstash agent " +
            "-w ${toString cfg.filterWorkers} " +
            ops havePluginPath "--pluginpath ${pluginPath} " +
            "${verbosityFlag} " +
            "--watchdog-timeout ${toString cfg.watchdogTimeout} " +
            "-f ${writeText "logstash.conf" ''
              input {
  