Comment 5 for bug 1895976

> these kind of changes are usually not deemed backwards compatible, so there is a valid point that the existent Ubuntu versions, for example, will never include that change.

Cloud-init updates from master are regularly (roughly once a quarter) released into previous Ubuntu LTS versions.

If there are changes to cloud-init needed they can be released into older versions of Ubuntu. In some cases where new features would change behavior, those are disabled in the older Ubuntu releases. For an issue like this where it would fix otherwise broken behavior it would be enabled in all of the releases.