farm-2.x-dev/modules/core/migrate/farm_migrate.services.yml

services:
  farm_migrate_event_subscriber:
    class: Drupal\farm_migrate\EventSubscriber\FarmMigrationSubscriber
    arguments:
      [ '@database', '@datetime.time', '@entity_type.manager', '@config.factory', '@state', '@plugin.manager.migration' ]
    tags:
      - { name: 'event_subscriber' }