CMK version: 2.1.0p13
OS version: Ubuntu 22.04.1 LTS
Error message: Missing monitoring data for plugins: apt
The agent output looks like this:
<<<apt:sep(0):cached(1665063981,3600)>>>
Try Ubuntu Pro beta with a free personal subscription on up to 5 machines.
Learn more at https://ubuntu.com/pro
This is simply because this beautiful ad ignores the -qq argument of apt-get.
A quick workaround is to edit line 40 of the mk_apt script and replace the existing grep -v with something like this:
grep -v '^Conf\|^Try Ubuntu Pro\|^Learn more at'