Update to Munin to the most current version.
Even with CentOS 6.4, WHM/cPanel 11.39 I noticed that version 1.4.7 of Munin was installed.
As everyone knows, version 2.x performs MUCH better than version 1.x, and also has better features.
My question is - why is the current Munin version (2.x) not installed as a standard part of WHM/cPanel?
Why the old version? 2.0 is also simpler to install and setup.