$ apt-cache policy ceph-osd
ceph-osd:
  Installed: 13.2.6-0ubuntu0.19.04.4
  Candidate: 13.2.6-0ubuntu0.19.04.4
  Version table:
 *** 13.2.6-0ubuntu0.19.04.4 500
        500 http://archive.ubuntu.com/ubuntu disco-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     13.2.6-0ubuntu0.19.04.3 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu disco-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu disco-security/main amd64 Packages
     13.2.4+dfsg1-0ubuntu2 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu disco/main amd64 Packages


disco-proposed tested with a deployment using separate db and wal devices; OSD's restarted reliably over 10 x reboot iterations across three machines.

$ lsblk
NAME                                                          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
loop0                                                           7:0    0 88.7M  1 loop /snap/core/7396
loop1                                                           7:1    0 54.5M  1 loop 
loop2                                                           7:2    0   89M  1 loop /snap/core/7713
loop3                                                           7:3    0 54.6M  1 loop /snap/lxd/11964
loop4                                                           7:4    0 54.6M  1 loop /snap/lxd/11985
vda                                                           252:0    0   20G  0 disk 
├─vda1                                                        252:1    0 19.9G  0 part /
├─vda14                                                       252:14   0    4M  0 part 
└─vda15                                                       252:15   0  106M  0 part /boot/efi
vdb                                                           252:16   0   40G  0 disk /mnt
vdc                                                           252:32   0   10G  0 disk 
└─ceph--683a8389--9788--4fd5--b59e--bdd69936a768-osd--block--683a8389--9788--4fd5--b59e--bdd69936a768
                                                              253:0    0   10G  0 lvm  
vdd                                                           252:48   0   10G  0 disk 
└─ceph--1fd8022f--e851--4cfa--82aa--64693510c705-osd--block--1fd8022f--e851--4cfa--82aa--64693510c705
                                                              253:6    0   10G  0 lvm  
vde                                                           252:64   0   10G  0 disk 
└─ceph--302bafc8--9981--47a3--b66b--3d84ab550ba5-osd--block--302bafc8--9981--47a3--b66b--3d84ab550ba5
                                                              253:3    0   10G  0 lvm  
vdf                                                           252:80   0    5G  0 disk 
├─ceph--db--28e3b53f--1468--4136--914d--6630343a2a67-osd--db--683a8389--9788--4fd5--b59e--bdd69936a768
│                                                             253:2    0    1G  0 lvm  
├─ceph--db--28e3b53f--1468--4136--914d--6630343a2a67-osd--db--302bafc8--9981--47a3--b66b--3d84ab550ba5
│                                                             253:5    0    1G  0 lvm  
└─ceph--db--28e3b53f--1468--4136--914d--6630343a2a67-osd--db--1fd8022f--e851--4cfa--82aa--64693510c705
                                                              253:8    0    1G  0 lvm  
vdg                                                           252:96   0    5G  0 disk 
├─ceph--wal--40c6b471--3ba2--41d5--9215--eabf391499de-osd--wal--683a8389--9788--4fd5--b59e--bdd69936a768
│                                                             253:1    0   96M  0 lvm  
├─ceph--wal--40c6b471--3ba2--41d5--9215--eabf391499de-osd--wal--302bafc8--9981--47a3--b66b--3d84ab550ba5
│                                                             253:4    0   96M  0 lvm  
└─ceph--wal--40c6b471--3ba2--41d5--9215--eabf391499de-osd--wal--1fd8022f--e851--4cfa--82aa--64693510c705
                                                              253:7    0   96M  0 lvm