One of the goals of V3 is that we are exposing a few internal CF concepts
as domain objects in the API. Specifically droplets and packages.

In V2, after you have pushed applications bits (created a package), the
next time that you start your application, if your package has not been
staged, staging will occur automatically.

We approached this differently in V3. Now you create a package (uploading
bits) and then you explicitly stage that package creating a runnable
droplet which you then can assign to your application. Thus the commit that
you see is the beginning of staging packages independently in V3.

You can learn more about this feature from this story(
https://www.pivotaltracker.com/story/show/84894476) and more about V3 from
this epic (https://www.pivotaltracker.com/epic/show/1334418).

Please keep in mind that V3 is still experimental and a work in progress.

Best,

Jim