11 files declare their use of YamlDiscovery

BreakpointManager.php in core/modules/breakpoint/src/BreakpointManager.php
ConfigMapperManager.php in core/modules/config_translation/src/ConfigMapperManager.php
ContextualLinkManager.php in core/lib/Drupal/Core/Menu/ContextualLinkManager.php
DirectoryWithMetadataPluginDiscovery.php in core/modules/sdc/src/Plugin/Discovery/DirectoryWithMetadataPluginDiscovery.php
FieldTypeCategoryManager.php in core/lib/Drupal/Core/Field/FieldTypeCategoryManager.php
LinkRelationTypeManager.php in core/lib/Drupal/Core/Http/LinkRelationTypeManager.php
LocalActionManager.php in core/lib/Drupal/Core/Menu/LocalActionManager.php
LocalTaskIntegrationTestBase.php in core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTestBase.php
LocalTaskManager.php in core/lib/Drupal/Core/Menu/LocalTaskManager.php
MenuLinkManager.php in core/lib/Drupal/Core/Menu/MenuLinkManager.php
YamlDiscoveryTest.php in core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryTest.php

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