fault field is shown when `show`ing a server by id but not by name

[justdan96]

As the title says, there is inconsistent behaviour when using a show command against a compute server. When using the id the fault field is shown, when using the name that field is not show. Two example commands:

% osc --os-project-name example-proj --os-cloud example-1 compute server show example-cluster-1-services-f-exaz-c-od-nmrnm-wmqh8

┌──────────────────────────────────────┬───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Attribute                            ┆ Value                                                                                                                                                                                             │
╞══════════════════════════════════════╪═══════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╡
│ accessIPv4                           ┆                                                                                                                                                                                                   │
│ accessIPv6                           ┆                                                                                                                                                                                                   │
│ addresses                            ┆ {}                                                                                                                                                                                                │
│ config_drive                         ┆                                                                                                                                                                                                   │
│ created                              ┆ 2026-03-03T11:38:09Z                                                                                                                                                                              │
│ flavor                               ┆ {"disk":0,"ephemeral":0,"extra_specs":{"aggregate_instance_extra_specs:7a":"true","hw:cpu_policy":"dedicated","hw:vif_multiqueue_enabled":"true"},"id":null,"links":null,"original_name":"m7a.4xl │
│                                      ┆ arge","ram":65536,"swap":0,"vcpus":16}                                                                                                                                                            │
│ hostId                               ┆                                                                                                                                                                                                   │
│ id                                   ┆ 1a7446fa-a2fd-4b68-94c5-beda056f53ae                                                                                                                                                              │
│ image                                ┆                                                                                                                                                                                                   │
│ key_name                             ┆ example-cluster-1-v1_31                                                                                                                                                                           │
│ links                                ┆ [{"href":"https://nova.example-1.apc.example-org-np.net:8774/v2.1/servers/1a7446fa-a2fd-4b68-94c5-beda056f53ae","rel":"self"},{"href":"https://nova.example-az-1.apc.example-org-np.net:8774/s    │
│                                      ┆ 446fa-a2fd-4b68-94c5-beda056f53ae","rel":"bookmark"}]                                                                                                                                             │
│ locked                               ┆ false                                                                                                                                                                                             │
│ metadata                             ┆ {}                                                                                                                                                                                                │
│ name                                 ┆ example-cluster-1-services-f-exaz-c-od-nmrnm-wmqh8                                                                                                                                                │
│ OS-DCF:diskConfig                    ┆ MANUAL                                                                                                                                                                                            │
│ OS-EXT-AZ:availability_zone          ┆ exaz-c                                                                                                                                                                                            │
│ OS-EXT-SRV-ATTR:hostname             ┆ example-cluster-1-services-f-exaz-c-od-nmrnm-wmqh8                                                                                                                                                │
│ OS-EXT-STS:power_state               ┆ 0                                                                                                                                                                                                 │
│ OS-EXT-STS:vm_state                  ┆ error                                                                                                                                                                                             │
│ os-extended-volumes:volumes_attached ┆ [{"delete_on_termination":true,"id":"831a37b5-ce8f-489e-b91a-4f5c2ee8e6f5"}]                                                                                                                      │
│ status                               ┆ ERROR                                                                                                                                                                                             │
│ tags                                 ┆ []                                                                                                                                                                                                │
│ tenant_id                            ┆ 3355290cdc954eb2a263d0b9ef3fd452                                                                                                                                                                  │
│ updated                              ┆ 2026-03-03T11:38:10Z                                                                                                                                                                              │
│ user_id                              ┆ 074c4f48420c4e358ccce06c38b4e8d5                                                                                                                                                                  │
└──────────────────────────────────────┴───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
% osc --os-project-name example-proj --os-cloud example-1 compute server show 1a7446fa-a2fd-4b68-94c5-beda056f53ae

┌──────────────────────────────────────┬───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Attribute                            ┆ Value                                                                                                                                                                                             │
╞══════════════════════════════════════╪═══════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╡
│ accessIPv4                           ┆                                                                                                                                                                                                   │
│ accessIPv6                           ┆                                                                                                                                                                                                   │
│ addresses                            ┆ {}                                                                                                                                                                                                │
│ config_drive                         ┆                                                                                                                                                                                                   │
│ created                              ┆ 2026-03-03T11:38:09Z                                                                                                                                                                              │
│ fault                                ┆ {"code":500,"created":"2026-03-03T11:38:10Z","details":null,"message":"No valid host was found. There are not enough hosts available."}                                                           │
│ flavor                               ┆ {"disk":0,"ephemeral":0,"extra_specs":{"aggregate_instance_extra_specs:7a":"true","hw:cpu_policy":"dedicated","hw:vif_multiqueue_enabled":"true"},"id":null,"links":null,"original_name":"m7a.4xl │
│                                      ┆ arge","ram":65536,"swap":0,"vcpus":16}                                                                                                                                                            │
│ hostId                               ┆                                                                                                                                                                                                   │
│ id                                   ┆ 1a7446fa-a2fd-4b68-94c5-beda056f53ae                                                                                                                                                              │
│ image                                ┆                                                                                                                                                                                                   │
│ key_name                             ┆ example-cluster-1-v1_31                                                                                                                                                                           │
│ links                                ┆ [{"href":"https://nova.example-1.apc.example-org-np.net:8774/v2.1/servers/1a7446fa-a2fd-4b68-94c5-beda056f53ae","rel":"self"},{"href":"https://nova.example-az-1.apc.example-org-np.net:8774/s    │
│                                      ┆ 446fa-a2fd-4b68-94c5-beda056f53ae","rel":"bookmark"}]                                                                                                                                             │
│ locked                               ┆ false                                                                                                                                                                                             │
│ metadata                             ┆ {}                                                                                                                                                                                                │
│ name                                 ┆ example-cluster-1-services-f-exaz-c-od-nmrnm-wmqh8                                                                                                                                                │
│ OS-DCF:diskConfig                    ┆ MANUAL                                                                                                                                                                                            │
│ OS-EXT-AZ:availability_zone          ┆ exaz-c                                                                                                                                                                                            │
│ OS-EXT-SRV-ATTR:hostname             ┆ example-cluster-1-services-f-exaz-c-od-nmrnm-wmqh8                                                                                                                                                │
│ OS-EXT-STS:power_state               ┆ 0                                                                                                                                                                                                 │
│ OS-EXT-STS:vm_state                  ┆ error                                                                                                                                                                                             │
│ os-extended-volumes:volumes_attached ┆ [{"delete_on_termination":true,"id":"831a37b5-ce8f-489e-b91a-4f5c2ee8e6f5"}]                                                                                                                      │
│ server_groups                        ┆ []                                                                                                                                                                                                │
│ status                               ┆ ERROR                                                                                                                                                                                             │
│ tags                                 ┆ []                                                                                                                                                                                                │
│ tenant_id                            ┆ 3355290cdc954eb2a263d0b9ef3fd452                                                                                                                                                                  │
│ updated                              ┆ 2026-03-03T11:38:10Z                                                                                                                                                                              │
│ user_id                              ┆ 074c4f48420c4e358ccce06c38b4e8d5                                                                                                                                                                  │
└──────────────────────────────────────┴───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

I suspect this is also why I don't see the fault field in ostui, which would be very useful for troubleshooting issues.

[gtema]

can you please check with -vv flag which APIs are used in the corresponding cases? I am pretty sure that in the case of using the name the result comes from the /servers/details/?name=XXX while in the ID case from /servers/XXX_ID.
The most important thing to clarify here is whether Nova sends the fault in the list case at all. You can check this by doing osc server show XXX_NAME -o json | jq - you will see the "pure" json data that osc received from nova. If you see the fault being present there, but not displayed in the normal output - there is an issue in osc, otherwise it is nova's fault.
Unfortunately I am not able to find any server for which I would have faults so I can't verify this myself. From the code pov the fault field is expected by the structure and should appear when it is present in the server response, unless explicitly hidden by the output customization, but that is pretty unlikely.

[justdan96]

Based on how I am reading https://docs.openstack.org/api-guide/compute/faults.html#instance-faults the GET /servers or GET /servers/details list endpoints wouldn't include the fault field, but GET /servers/{id} would. I'll see if I can replicate the issue though.

[gtema]

sad issue is that the fault is listed in the api-ref for the /servers/details, but who knows whether it really is. Actually in the nova code I see it "should" be there. Anyway, you can only be sure by checking what it returns in real