Activating Munin plugins

# activating a simple plugin
ln -s /usr/share/munin/plugins/cpu /etc/munin/plugins/
# activating a wildcard plugin
ln -s /usr/share/munin/plugins/if_ /etc/munin/plugins/if_eth0
# restart munin-node with your distribution's tools (e.g. systemctl or service)
service munin-node restart