Hello, I'm actually using OpenStack-Ansible to deploy a little public cloud. For now it runs on Queens / Ubuntu 16.04. I've read that Rocky will be the only release supported on both Ubuntu 16.04 and Ubuntu 18.04 with OpenStack-Ansible. Stein being out soon (with OpenStack-Ansible), the question of Host OS upgrade from Ubuntu 16.04 to ubuntu 18.04 is a big thing of this year. I've not found any documentation about that upgrade path (Rocky->Stein, host OS). I had some answers on IRC that OpenStack Ansible does not support a mixed environnement (adding compute nodes on Ubuntu 18.04 while the rest is on Ubuntu 16.04 for example). Did I miss something in the actual doc or in some blogs ? I'm sure some users already faced this with transition fro Ubuntu 14.04 to Ubuntu 16.04. There's certainly some material to start some documentation and add it to https://docs.openstack.org/openstack-ansible/stein/admin/upgrades/ major-upgrades.html. I know that there's less contributors now, I'll see if I can help. Thanks.