Comment 5 for bug 1664575

I checked "OS-EXT-SRV-ATTR:instance_name" attribute is not storing into the database. It's something like creating at run time probably using id of instance.
1. https://ask.openstack.org/en/question/26295/how-does-nova-maps-the-display-name-of-vm-or-instance-in-openstack-to-instance-name-in-kvmesx-etc/
2. https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/extended_server_attributes.py#L49

Probably we can use follow.
In 'nova' database there is a table called 'instance_extra'.
mysql> show columns from instance_extra;
+-------------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+-------------+------+-----+---------+----------------+
| created_at | datetime | YES | | NULL | |
| updated_at | datetime | YES | | NULL | |
| deleted_at | datetime | YES | | NULL | |
| deleted | int(11) | YES | | NULL | |
| id | int(11) | NO | PRI | NULL | auto_increment |
| instance_uuid | varchar(36) | NO | MUL | NULL | |
| numa_topology | text | YES | | NULL | |
| pci_requests | text | YES | | NULL | |
| flavor | text | YES | | NULL | |
| vcpu_model | text | YES | | NULL | |
| migration_context | text | YES | | NULL | |
| keypairs | text | YES | | NULL | |
| device_metadata | text | YES | | NULL | |
+-------------------+-------------+------+-----+---------+----------------+
13 rows in set (0.00 sec)

My suggestion is we can use column 'device_metadata'.