your /etc/os-release file should be link to link to
/usr/lib/os.release.d/ovirt-release-host-node with the content like this:
# cat /usr/lib/os.release.d/ovirt-release-host-node
NAME="CentOS Stream"
VERSION="8"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8.7.2205.0"
VARIANT="oVirt Node 4.5.0.3"
VARIANT_ID="ovirt-node"
PRETTY_NAME="oVirt Node 4.5.0"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.ovirt.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
PLATFORM_ID="platform:el8"
maybe something went wrong while installing the package
ovirt-release-host-node-4.5.0.3-1.el8.x86_64.rpm (part of latest ovirt-node release).