Lets say I have an app which first has 5 instances running, and then, I'd like to scale it to 3, ok, marathon generates a new Version with only instances changed.
As a end user, ok, it's fine, because I see there are 3 instances and all of them has the same Version, that's make me happy, no surprise.
However, if I scale my app from 1 to 8, ok, it does surprise me, it says there are 2 Versions instances, 1 in version 1 and 7 in version 2.
See instances list as below.
That's definitely not a good idea I think, from an end user point of view.
It just says my application going to sane, inconsistent state.
I think we should kick instance out of Version.