OK so making the assumption that the ceph-ansible tooling relies on the ceph-mon@ units, I can confirm that a ceph-mon process is not automatically started on reboot.
This is a bit of a misalignment between ceph provided packaging and what's in ubuntu and debian (due to historical introduction of systemd support in Debian prior to upstream ceph).
OK so making the assumption that the ceph-ansible tooling relies on the ceph-mon@ units, I can confirm that a ceph-mon process is not automatically started on reboot.
This is a bit of a misalignment between ceph provided packaging and what's in ubuntu and debian (due to historical introduction of systemd support in Debian prior to upstream ceph).