addRevisionMetadataField example

public static function getSubscribedEvents(): array {
    return static::getEntityTypeEvents();
  }

  /** * {@inheritdoc} */
  public function onEntityTypeCreate(EntityTypeInterface $entity_type) {
    // If the entity type is supported by Workspaces, add the revision metadata     // field.     if ($this->workspaceManager->isEntityTypeSupported($entity_type)) {
      $this->addRevisionMetadataField($entity_type);
    }
  }

  /** * {@inheritdoc} */
  public function onFieldableEntityTypeCreate(EntityTypeInterface $entity_type, array $field_storage_definitions) {
    $this->onEntityTypeCreate($entity_type);
  }

  /** * {@inheritdoc} */