To prevent customers from running into the following bug when upgrading from osp9: https://bugzilla.redhat.com/show_bug.cgi?id=1658652 Please update the upgrade documentation to link to the following KCS: https://access.redhat.com/solutions/4090431 One place this content could be inserted is the pre-upgrade notes. For example: https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/9/html/upgrading_red_hat_openstack_platform/chap-upgrading_the_environment#sect-Important_Pre-Upgrade_Notes In section 3.1 add an additional bullet which says something along the lines of: """ Apply a version lock to libvirt as described in https://access.redhat.com/solutions/4090431 """