Comment 7 for bug 1753432

Support for managing nova-consoleauth with corosync/pacemaker is being dropped in the next release of the charms (19.04) - https://github.com/openstack/charm-nova-cloud-controller/commit/b6e314077fa352ba58c346919a1e1cd4f6593226

I would recommend migrating to using memcached so that you can then upgrade to get 19.04 (otherwise it will complain that it is not related).