By daffie on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
9.2.x
Introduced in version: 
9.2.0
Issue links: 
https://www.drupal.org/node/3209618
Description: 

The method Symfony\Component\HttpKernel\Event\KernelEvent::isMasterRequest() is deprecated in Symfony 5.3. The method has been replaced by Symfony\Component\HttpKernel\Event\KernelEvent::isMainRequest(). In Drupal 9 we are using Symfony 4. In Drupal 10 we are wanting to use Symfony 6, therefore we need to add the deprecations of Symfony 5 in Drupal 9.

Impacts: 
Module developers