Before backporting this fix to 4.1, we need to fix the s390x platform support (https://bugzilla.redhat.com/show_bug.cgi?id=1789260), so that we don't run into the same issue again.
Created PR to backport cpu-info metric to 4.1 (https://github.com/openshift/node_exporter/pull/56) Although the multi-platform support is not yet merged upstream, we can at least add the cpu-info metric to 4.1 and note that it is only supported on x86 arches.