Install munin-node
apt install munin-node munin-plugins-extra -y
allow munin-master
# /etc/munin/munin-node.conf
allow XXX.XX.XXX.XXX
On the master add the node
# /etc/munin/munin.conf
[hostname]
address XXX.XXX.XXX.XX
use_node_name yes
automatically enable suggest plugins
munin-node-configure --shell --families=contrib,auto | sh -x