Creates Munin graphs from the stats wcc collects in it's stats.yml usually placed at /var/tmp/wcc/stats.yml (or another location specified via env.wcc_stats_file).
Clone this repository or download the wcc_ file and create a symlink as root in /etc/munin/plugins by using e.g.:
cd /etc/munin/plugins; ln -s /path/to/wcc_ wcc_<mode>
where is one of runs|update|changes.
Don't forget to restart your munin-node deamon.