Change record status: 
Project: 
Introduced in branch: 
9.0.x
Introduced in version: 
9.0.0-alpha1
Description: 

Upgrade paths for Drupal 8 sites from before Drupal 8.8.0 have been removed from Drupal 9. This means that people running Drupal 8.7.x or earlier will need to update to Drupal 8.8.x or later before updating to Drupal 9. See Remove old update hooks prior to each major version for more information.

If you are running Drupal 6 or 7, the migration path still supports direct migration to Drupal 9. No changes there.

Impacts: 
Site builders, administrators, editors
Module developers
Site templates, recipes and distribution developers