By longwave on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
10.2.x
Introduced in version: 
10.2.0
Issue links: 
https://www.drupal.org/node/3221128
Description: 

Services that implement EventSubscriberInterface no longer need to be individually tagged. Specifying autoconfigure: true in the _defaults section of a module's services.yml is enough to get all services implementing the interface to be automatically registered as event subscribers.

Example

Before:

services:
  response_generator_subscriber:
    class: Drupal\Core\EventSubscriber\ResponseGeneratorSubscriber
    tags:
      - { name: event_subscriber }
  redirect_response_subscriber:
    class: Drupal\Core\EventSubscriber\RedirectResponseSubscriber
    arguments: ['@unrouted_url_assembler', '@router.request_context']
    tags:
      - { name: event_subscriber }
  redirect_leading_slashes_subscriber:
    class: Drupal\Core\EventSubscriber\RedirectLeadingSlashesSubscriber
    tags:
      - { name: event_subscriber }
  request_close_subscriber:
    class: Drupal\Core\EventSubscriber\RequestCloseSubscriber
    tags:
      - { name: event_subscriber }

After:

services:
  _defaults:
    autoconfigure: true
  response_generator_subscriber:
    class: Drupal\Core\EventSubscriber\ResponseGeneratorSubscriber
  redirect_response_subscriber:
    class: Drupal\Core\EventSubscriber\RedirectResponseSubscriber
    arguments: ['@unrouted_url_assembler', '@router.request_context']
  redirect_leading_slashes_subscriber:
    class: Drupal\Core\EventSubscriber\RedirectLeadingSlashesSubscriber
  request_close_subscriber:
    class: Drupal\Core\EventSubscriber\RequestCloseSubscriber
Impacts: 
Module developers