The setup notes for munin-node and MMS Monitoring specifically mention Centos:
On some platforms, munin-node does not have all required plugins enabled.
For CentOS, the munin-node package does not have the iostat and iostat_ios plugins enabled. Use the following operation to enable these plugins:
sudo ln -s /usr/share/munin/plugins/iostat /etc/munin/plugins/iostat
sudo ln -s /usr/share/munin/plugins/iostat_ios /etc/munin/plugins/iostat_ios
sudo /etc/init.d/munin-node restart
However, I've just tried with Ubuntu 14.04 (LTS) 64-bit, and this also doesn't have the iostat plugins enabled by default either.
The above lines appear to work for Ubuntu as well.
I think we should amend it to read "For CentOS and Ubuntu" etc. - we only have two Linux distros that are officially supported for MMS anyway (RHEL and it's variants, and Ubuntu) so either we list them both if these instructions apply to both, or we just make it a generic "On some distros".