Version warning banners not showing

[pmocz]

Details

• Read the Docs project URL: https://readthedocs.org/projects/mesa_doc/

Expected Result

I'm expecting some version banner warnings to show up as I switch versions of the project using the flyout. I have all the new add-ons enabled in read-the-docs maintainer dashboard. The project uses github tags

Actual Result

I do not see version warning banners

[stsewd]

Hi, this is because your versions don't follow semver as specified by the PEP 440 (https://docs.readthedocs.io/en/stable/versions.html#how-we-envision-versions-working). We use that to sort versions, and get the stable version. Since none of your versions are valid, we don't have a stable version to link to (we always link to the stable version in the warning banner).

See #11183 and #5319, for letting users define how to get the stable version.