root@moby:/backups# nova-manage db online_data_migrations
Option "verbose" from group "DEFAULT" is deprecated for removal.  Its value may be silently ignored in the future.
Running batches of 50 until complete
2017-04-20 15:06:17.844 778 WARNING nova.objects.instance [req-9b64c55e-d305-4580-b0c6-a9edfebf340c - - - - -] Instance 58d8a435-8d93-4de1-bf57-98e16c7730c7 is deleted, but has an undeleted InstanceExtra record. Ignoring
Error attempting to run <function migrate_instance_keypairs at 0x7f068ba1ac08>
error: 'NoneType' object has no attribute 'key_name'