7 methods override DefaultPluginManager::findDefinitions()

ConfigMapperManager::findDefinitions in core/modules/config_translation/src/ConfigMapperManager.php
EntityTypeManager::findDefinitions in core/lib/Drupal/Core/Entity/EntityTypeManager.php
HelpTopicPluginManager::findDefinitions in core/modules/help/src/HelpTopicPluginManager.php
MigrateFieldPluginManager::findDefinitions in core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManager.php
MigrateSourcePluginManager::findDefinitions in core/modules/migrate/src/Plugin/MigrateSourcePluginManager.php
Finds plugin definitions.
MigrationPluginManager::findDefinitions in core/modules/migrate/src/Plugin/MigrationPluginManager.php
Finds plugin definitions.
SectionStorageManager::findDefinitions in core/modules/layout_builder/src/SectionStorage/SectionStorageManager.php

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