Noticed the images showing up all have a custom property: show: true. Trying to update the Nodepool image to inject the same metadata for the image ci-dib-jessie-wikimedia. Thus under provider wmflabs-eqiad:

images:
  - name: ci-dib-jessie-wikimedia
      meta:
          show: 'true'

yeah, that's on purpose -- otherwise we'd be inviting users to create instances based on obsolete images. The official upstream bug for that is https://bugs.launchpad.net/horizon/+bug/1470225

The custom properties need to be passed as a properties containing a hash hence:

providers:
  - name: wmflabs-eqiad
    ....
    images:
      - name: ci-dib-jessie-wikimedia
        diskimage: ci-dib-jessie-wikimedia
        ...
        meta:
          properties:
            show: 'true'

In T105015#1438613, @Andrew wrote:

yeah, that's on purpose -- otherwise we'd be inviting users to create instances based on obsolete images. The official upstream bug for that is https://bugs.launchpad.net/horizon/+bug/1470225

Nice! Looks like I missed the introduction of show: true. Took me a while to figure out how to inject in the image metadata but eventually found out the magic YAML above :-}

Good to see your deprecated proposal in OpenStack Horizon. I am sure it will be useful to other peoples.

Was caused by the new feature T91782: Upstream: Limit available images on horizon which now let us hide images \O/