[VERIFICATION BIONIC]

* Before the upgrade:
#ps
ceph       14495       1  0 14:40 ?        00:00:32 /usr/bin/ceph-osd -f --cluster ceph --id 3 --setuser ceph --setgroup ceph

# pidof ceph-osd
14495

#dpkg
ii  ceph                            12.2.12-0ubuntu0.18.04.2                    amd64        distributed storage and file system
ii  ceph-base                       12.2.12-0ubuntu0.18.04.2                    amd64        common ceph daemon libraries and management tools
ii  ceph-common                     12.2.12-0ubuntu0.18.04.2                    amd64        common utilities to mount and interact with a ceph storage cluster
ii  ceph-mgr                        12.2.12-0ubuntu0.18.04.2                    amd64        manager for the ceph distributed file system
ii  ceph-mon                        12.2.12-0ubuntu0.18.04.2                    amd64        monitor server for the ceph storage system
ii  ceph-osd                        12.2.12-0ubuntu0.18.04.2                    amd64        OSD server for the ceph storage system
ii  libcephfs2                      12.2.12-0ubuntu0.18.04.2                    amd64        Ceph distributed file system client library
ii  python-cephfs                   12.2.12-0ubuntu0.18.04.2                    amd64        Python libraries for the Ceph libcephfs library
ii  python-rados                    12.2.12-0ubuntu0.18.04.2                    amd64        Python libraries for the Ceph librados library
ii  python-rbd                      12.2.12-0ubuntu0.18.04.2                    amd64        Python libraries for the Ceph librbd library


* After the upgrade to the proposed package:

#ps
ceph       14495       1  0 14:40 ?        00:00:32 /usr/bin/ceph-osd -f --cluster ceph --id 3 --setuser ceph --setgroup ceph

# pidof ceph-osd
14495

# dpkg -l | grep -i ceph
ii  ceph                            12.2.12-0ubuntu0.18.04.3                    amd64        distributed storage and file system
ii  ceph-base                       12.2.12-0ubuntu0.18.04.3                    amd64        common ceph daemon libraries and management tools
ii  ceph-common                     12.2.12-0ubuntu0.18.04.3                    amd64        common utilities to mount and interact with a ceph storage cluster
ii  ceph-mgr                        12.2.12-0ubuntu0.18.04.3                    amd64        manager for the ceph distributed file system
ii  ceph-mon                        12.2.12-0ubuntu0.18.04.3                    amd64        monitor server for the ceph storage system
ii  ceph-osd                        12.2.12-0ubuntu0.18.04.3                    amd64        OSD server for the ceph storage system
ii  libcephfs2                      12.2.12-0ubuntu0.18.04.3                    amd64        Ceph distributed file system client library
ii  python-cephfs                   12.2.12-0ubuntu0.18.04.3                    amd64        Python libraries for the Ceph libcephfs library
ii  python-rados                    12.2.12-0ubuntu0.18.04.3                    amd64        Python libraries for the Ceph librados library
ii  python-rbd                      12.2.12-0ubuntu0.18.04.3                    amd64        Python libraries for the Ceph librbd library

This is the expected behaviour, osd didn't restart ON nor AFTER upgrade, which now leave the decision to the sysadmin of the ceph cluster to decide when to restart via their maintenance window policy.