These actions are unsupported since the changes are to the OS itself, not the Checkmk software. So far this behavior has only been observed on SUSE Linux Enterprise Server 15 (SLES15) with Service Pack 4.
Problem
A customer may encounter an issue where the characters in their Checkmk service graphs appear incorrect. This is caused by the default font pack that SLES15 SP4 uses.
Solution
To resolve this, you can execute the following commands either as a normal Linux user or as root:
- sudo omd stop <SITENAME>
- cd /usr/share/
- sudo mv fonts fonts.bak
- sudo zypper install -f google-opensans-fonts
- sudo omd start <SITENAME>
After the Checkmk site has been started again, the service graphs should display as expected.