By dww on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
9.4.x
Introduced in version: 
9.4.0-alpha1
Issue links: 
https://www.drupal.org/node/3215044
Description: 

The admin/appearance page now includes a warning about themes that have either deprecated or obsolete as the value of lifecycle in their .info.yml file. For example, the warning on a deprecated theme looks something like this (depending on the styles of your administration theme):

Screenshot of the admin/appearance page showing a deprecated theme

Impacts: 
Site builders, administrators, editors
Themers