anchor.diff:        };
   
         disabledPlugins = mkOption {
  -        default = [];
  +        # TODO: figure out why Munin isn't writing the log file and fix it.
  +        # In the meantime this at least suppresses a useless graph full of
  +        # NaNs in the output.
  +        default = [ "munin_stats" ];
           type = with types; listOf string;
           description = ''
             Munin plugins to disable, even if
             <literal>munin-node-configure --suggest</literal> tries to enable
             them. To disable a wildcard plugin, use an actual wildcard, as in
             the example.
  +
  +          munin_stats is disabled by default as it tries to read
  +          <literal>/var/log/munin/munin-update.log</literal> for timing
  +          information, and the NixOS build of Munin does not write this file.
           '';
           example = [ "diskstats" "zfs_usage_*" ];
         };
  
positive.code:       [ipmi*]
        user root
        group root
  
        ${nodeCfg.extraPluginConfig}
      '';
  
negative.code:       description = "Munin monitoring user";
        group = "munin";
        uid = config.ids.uids.munin;
        home = "/var/lib/munin";
      }];
  
      users.groups = [{
  