Defining apps.py name while upgrading from Django 2.X to 3.X

In my Django 2.X project, I had the following structure generated by default:

project_name

      ---> animal_app

                 ---> apps.py

                              name = "animal"

                 ---> zebra

                               ---> apps.py

                                           name = "zebra"

Note that zebra is sub-app of animal app, and name is attribute of it's app config.

Now, after upgrading to 3.X, I figured out that I needed to change name="zebra"  to name="animal.zebra"

I wanted to understand why this change is needed and what does it mean? From the docs and release note it is not much clearly stated for the sub-apps.

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