Change record status: 
Project: 
Introduced in branch: 
8.3.x
Introduced in version: 
8.3.0
Description: 

drupal.js provided the main Drupal JS API, but also took care of domready event handling.
We have splitted the initialization to a new javascript file: drupal.init.js.

If you were using libraries-override for overriding core/drupal, you need to be aware that now it includes two different files:

drupal:
  version: VERSION
  js:
    misc/drupal.js: { weight: -18 }
    misc/drupal.init.js: { weight: -17 }
  dependencies:
    - core/domready
    - core/drupalSettings
Impacts: 
Module developers
Themers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done