Comment 1 for bug 1735839

For dname links and regular disk devices it looks like ID_PART_TABLE_UUID is already used:
def make_dname(volume, storage_config):
    if vol.get('type') == "disk":
        rule.append(compose_udev_equality('ENV{DEVTYPE}', "disk"))
        rule.append(compose_udev_equality('ENV{ID_PART_TABLE_UUID}', ptuuid))

For other devices this is not present by default but they have other identification methods.

   elif vol.get('type') == "bcache":
        rule.append(compose_udev_equality("ENV{DEVNAME}", path))

Still, this is not usable for disks without partitions from MAAS.