We had a session about tracks in the sprint last week and agreed to open up tracks for use with minor versions, assuming the project is following something similar to semantic versioning. In other words, if the project has a minor release 3.2 and may offer patch/micro releases such as 3.2.1 under it, we’ll accept tracks for that purpose and include a respective regular expression to guardrail its versions under said track.
So it’s okay to have tracks for Docker 17.03, 17.06, etc.
I’ve also provided more comprehensive documentation about channel terminology and policy here in the forum.