anchor.diff:      };
   
       systemd.watchdog.runtimeTime = mkOption {
  -      type = types.str;
  +      type = types.nullOr types.str;
  +      default = null;
         example = "30s";
         description = ''
           The amount of time which can elapse before a watchdog hardware device
  
positive.code:     };
  
      systemd.watchdog.kexecTime = mkOption {
        type = types.str;
        example = "10m";
        description = ''
          The amount of time which can elapse when kexec is being executed before
  
negative.code:     };
  
      systemd.watchdog.rebootTime = mkOption {
        type = types.nullOr types.str;
        default = null;
        example = "10m";
        description = ''
          The amount of time which can elapse after a reboot has been triggered
  