CPU Auslastung sehr hoch

If you run the official Checkmk Docker images, this workaround does not work, as there is no Checkmk 2.2 installed in parallel to 2.3.

What helps is to install the librrds-perl package into the running container.

docker exec checkmk bash -c 'apt-get update && apt-get install -y librrds-perl'

(Replace checkmk with the name of your docker container.)