Version 18 of openstack-cluster-installer is marked for autoremoval from testing on Sat 09 Mar 2019. It depends (transitively) on horizon, lxc, affected by #915023, #921667. You should try to prevent the removal by fixing these RC bugs.
vcswatch reports that
this package has been uploaded into the archive but the debian/changelog in the
VCS is still UNRELEASED. You should consider pushing the missing commits
or updating the VCS.
![[bug history graph]](https://qa.debian.org/data/bts/graphs/o/openstack-cluster-installer.png){kind=link}