when viewing "Virtual Machines" tab on OpenStack compute_resources foreman throws 500. THis is because in Queens they dropped support of keystone api v2 leaving only v3. On compute_resources_vms/index/_openstack.html.erb tryes to show "tenant" name for each VM. This is causing to call /v2.0/tenants on keystone whitch fails with 404. Keystone API v3 is changed terminology from "tenants" to "projects" but I believe that best way is to remove this column as OpenStack Compute Resource is project local, and all VMS in in will always have same project name.