anchor.diff:  
         enable = mkOption {
           default = false;
  +        type = types.bool;
           description = ''
             Enable Munin Node agent. Munin node listens on 0.0.0.0 and
             by default accepts connections only from 127.0.0.1 for security reasons.
  
positive.code: 
        enable = mkOption {
          default = false;
          description = ''
            Enable munin-cron. Takes care of all heavy lifting to collect data from
            nodes and draws graphs to html. Runs munin-update, munin-limits,
  
negative.code: 
        extraGlobalConfig = mkOption {
          default = "";
          type = types.lines;
          description = ''
            <filename>munin.conf</filename> extra global configuration.
            See <link xlink:href='http://guide.munin-monitoring.org/en/latest/reference/munin.conf.html' />.
  