All classes that implement ModerationHandlerInterface in Drupal 9
- class \Drupal\config_entity_revisions\Entity\Handler\ConfigEntityRevisionsModerationHandler
- class \Drupal\content_moderation\Entity\Handler\BlockContentModerationHandler
- class \Drupal\content_moderation\Entity\Handler\ModerationHandler implements ModerationHandlerInterface, EntityHandlerInterface uses StringTranslationTrait
- class \Drupal\content_moderation\Entity\Handler\NodeModerationHandler