Is your unreclaimable SLAB usage on CentOS 8 growing when running the Check_MK agent on it? See Werk#10070

We have seen cases in which the parameter “KillMode=process” of the unit file “check_mk@.service” causes a memory leak. […] To fix this, the parameter “KillMode=process” was changed to “Type=forking”.

Also systemd#6567 and debian#940021.