The addCachedDiscovery() method has been removed from CachedDiscoveryClearerInterface

The addCachedDiscovery() method was removed from the CachedDiscoveryClearerInterface. Drupal 11.1 stopped calling the addCachedDiscovery() method during construction of the plugin.cache_clearer service. Instead, a tagged iterator is injected into CachedDiscoveryClearer constructor.

Implementations of CachedDiscoveryClearerInterface should follow that example and remove their addCachedDiscovery() methods as well and use the #[AutowireIterator(tag: 'plugin_manager_cache_clear')] attribute in their constructor. Note, that this requires autowire: true on the service definition as well.

Before

class CachedDiscoveryClearer implements CachedDiscoveryClearerInterface {

  /**
   * The stored discoveries.
   *
   * @var \Drupal\Component\Plugin\Discovery\CachedDiscoveryInterface[]
   */
  protected $cachedDiscoveries = [];

  /**
   * {@inheritdoc}
   */
  public function addCachedDiscovery(CachedDiscoveryInterface $cached_discovery) {
    $this->cachedDiscoveries[] = $cached_discovery;
  }

After

class CachedDiscoveryClearer implements CachedDiscoveryClearerInterface {

  /**
   * Constructs the CachedDiscoveryClearer service.
   *
   * @param \Traversable $cachedDiscoveries
   *   The cached discoveries.
   */
  public function __construct(
    #[AutowireIterator(tag: 'plugin_manager_cache_clear')]
    protected \Traversable $cachedDiscoveries,
  ) {}