All classes that implement CronInterface in Drupal 8
- class \Drupal\Core\Cron implements CronInterface
- class \Drupal\Core\ProxyClass\Cron implements CronInterface uses DependencySerializationTrait
- class \Drupal\ultimate_cron\ProxyClass\UltimateCron implements CronInterface uses DependencySerializationTrait
- class \Drupal\ultimate_cron\UltimateCron