Ceilometer doesnt get "image_ref" metadata

[Uriel Medina]

Hello everyone!
I'm using Ceilometer with Kolla-Ansible in the Wallaby version.

The issue is that Ceilometer doesnt get the "image_ref" field for the instances.
Using the CLI in my controller node I noticed something. If I list the servers, I get:

openstack server list
+--------------------------------------+------+--------+--------------------------+---------+
| ID | Name | Status | Image | Flavor |
+--------------------------------------+------+--------+--------------------------+---------+
| e0d92c67-8def-4406-b915-3c42011ec842 | test | ACTIVE | N/A (booted from volume) | m1.tiny |
+--------------------------------------+------+--------+--------------------------+---------+

As you can see, in the field "image" it says "N/A (booted from volume)", even when I'm expliciting using the Cirros image.
This also happens if I get the detail of this server:

openstack server show e0d92c67-8def-4406-b915-3c42011ec842
+-------------------------------------+----------------------------------------------------------+
| Field | Value |
+-------------------------------------+----------------------------------------------------------+
| OS-DCF:diskConfig | AUTO |
| OS-EXT-AZ:availability_zone | nova |
| OS-EXT-SRV-ATTR:host | urimeba |
| OS-EXT-SRV-ATTR:hypervisor_hostname | urimeba |
| OS-EXT-SRV-ATTR:instance_name | instance-00000001 |
| OS-EXT-STS:power_state | Running |
| OS-EXT-STS:task_state | None |
| OS-EXT-STS:vm_state | active |
| OS-SRV-USG:launched_at | 2021-10-06T22:16:55.000000 |
| OS-SRV-USG:terminated_at | None |
| accessIPv4 | |
| accessIPv6 | |
| addresses | net0=10.0.4.167 |
| config_drive | |
| created | 2021-10-06T22:16:34Z |
| flavor | m1.tiny (1) |
| hostId | d9286e3adc1622d83fcc36f44326f1ce82dc572888f998b84ded5afb |
| id | e0d92c67-8def-4406-b915-3c42011ec842 |
| image | N/A (booted from volume) |
| key_name | mykey |
| name | test |
| progress | 0 |
| project_id | e8876499afc54613ab4fb23831b35aa5 |
| properties | |
| security_groups | name='default' |
| status | ACTIVE |
| updated | 2021-10-06T22:16:55Z |
| user_id | 3549fc293dfa408eae7eae75d4204848 |
| volumes_attached | id='c482dcd4-ea16-4ba3-9aca-fae53c04838c' |
+-------------------------------------+----------------------------------------------------------+

Also, in the field image, it says "N/A (booted from volume)".

But If I got to "Project / Compute / Instances / test", I DO get the "image_id" inside the metadata section, like this:

METADATA
Key Name mykey
Image Name cirros
Image ID ba02706d-3d65-43ef-8cb4-0e940cdd749e

This are the fields of "instance" resource type:

openstack metric resource-type show instance
+------------------------------+-----------------------------------------------------------+
| Field | Value |
+------------------------------+-----------------------------------------------------------+
| attributes/availability_zone | max_length=255, min_length=0, required=False, type=string |
| attributes/created_at | required=False, type=datetime |
| attributes/deleted_at | required=False, type=datetime |
| attributes/display_name | max_length=255, min_length=0, required=True, type=string |
| attributes/flavor_id | max_length=255, min_length=0, required=True, type=string |
| attributes/flavor_name | max_length=255, min_length=0, required=True, type=string |
| attributes/host | max_length=255, min_length=0, required=True, type=string |
| attributes/image_ref | max_length=255, min_length=0, required=False, type=string |
| attributes/launched_at | required=False, type=datetime |
| attributes/server_group | max_length=255, min_length=0, required=False, type=string |
| name | instance |
| state | active |
+------------------------------+-----------------------------------------------------------+

And this are the metric details of my instance:
+-----------------------+---------------------------------------------------------------------+
| Field | Value |
+-----------------------+---------------------------------------------------------------------+
| availability_zone | None |
| created_at | 2021-10-06T22:16:34+00:00 |
| created_by_project_id | 8be68add86ec4f54a0c88704a51ef756 |
| created_by_user_id | 0cec9b778acb4849b6d7cd1072e52aa8 |
| creator | 0cec9b778acb4849b6d7cd1072e52aa8:8be68add86ec4f54a0c88704a51ef756 |
| deleted_at | None |
| display_name | test |
| ended_at | None |
| flavor_id | 1 |
| flavor_name | m1.tiny |
| host | urimeba |
| id | e0d92c67-8def-4406-b915-3c42011ec842 |
| image_ref | None |
| launched_at | 2021-10-06T22:16:55+00:00 |
| metrics | compute.instance.booting.time: aed27fa8-9c3a-406f-bbf2-21fb146ee907 |
| | disk.ephemeral.size: 7d865552-80b7-407a-8e8b-c88a04694906 |
| | disk.root.size: 0565e95c-7a70-4430-a7ba-698d86e551d4 |
| | memory: 19bb0df7-8487-4c34-bb5d-52abb27f236d |
| | vcpus: 1dc0c271-d11c-441a-a0f3-893e4af6ec3b |
| original_resource_id | e0d92c67-8def-4406-b915-3c42011ec842 |
| project_id | e8876499afc54613ab4fb23831b35aa5 |
| revision_end | None |
| revision_start | 2021-10-06T23:00:14.718888+00:00 |
| server_group | None |
| started_at | 2021-10-06T22:16:55.346734+00:00 |
| type | instance |
| user_id | 3549fc293dfa408eae7eae75d4204848 |
+-----------------------+---------------------------------------------------------------------+

I'll appreciate any help!
Thanks :)