15 files declare their use of RoutingEvents in Zircon Profile 8

AdminRouteSubscriber.php in core/modules/system/src/EventSubscriber/AdminRouteSubscriber.php

Contains \Drupal\system\EventSubscriber\AdminRouteSubscriber.

CacheRouterRebuildSubscriber.php in core/lib/Drupal/Core/EventSubscriber/CacheRouterRebuildSubscriber.php

Contains \Drupal\Core\EventSubscriber\CacheRouterRebuildSubscriber.

ContentTranslationRouteSubscriber.php in core/modules/content_translation/src/Routing/ContentTranslationRouteSubscriber.php

Contains \Drupal\content_translation\Routing\ContentTranslationRouteSubscriber.

EntityRouteAlterSubscriber.php in core/lib/Drupal/Core/EventSubscriber/EntityRouteAlterSubscriber.php

Contains \Drupal\Core\EventSubscriber\EntityRouteAlterSubscriber.

EntityRouteProviderSubscriber.php in core/lib/Drupal/Core/EventSubscriber/EntityRouteProviderSubscriber.php

Contains \Drupal\Core\EventSubscriber\EntityRouteProviderSubscriber.

MenuRouterRebuildSubscriber.php in core/lib/Drupal/Core/EventSubscriber/MenuRouterRebuildSubscriber.php

Contains \Drupal\Core\EventSubscriber\MenuRouterRebuildSubscriber.

ParamConverterSubscriber.php in core/lib/Drupal/Core/EventSubscriber/ParamConverterSubscriber.php

Contains \Drupal\Core\EventSubscriber\ParamConverterSubscriber.

PathRootsSubscriber.php in core/lib/Drupal/Core/EventSubscriber/PathRootsSubscriber.php

Contains \Drupal\Core\EventSubscriber\PathRootsSubscriber.

RouteBuilderTest.php in core/tests/Drupal/Tests/Core/Routing/RouteBuilderTest.php

Contains \Drupal\Tests\Core\Routing\RouteBuilderTest.

RouteEnhancerSubscriber.php in core/lib/Drupal/Core/EventSubscriber/RouteEnhancerSubscriber.php

Contains \Drupal\Core\EventSubscriber\RouteEnhancerSubscriber.

RouteFilterSubscriber.php in core/lib/Drupal/Core/EventSubscriber/RouteFilterSubscriber.php

Contains \Drupal\Core\EventSubscriber\RouteFilterSubscriber.

RouteMethodSubscriber.php in core/lib/Drupal/Core/EventSubscriber/RouteMethodSubscriber.php

Contains \Drupal\Core\EventSubscriber\RouteMethodSubscriber.

RouteSubscriber.php in core/modules/views/src/EventSubscriber/RouteSubscriber.php

Contains \Drupal\views\EventSubscriber\RouteSubscriber.

RouteSubscriber.php in core/modules/config_translation/src/Routing/RouteSubscriber.php

Contains \Drupal\config_translation\Routing\RouteSubscriber.

RouteSubscriber.php in core/modules/field_ui/src/Routing/RouteSubscriber.php

Contains \Drupal\field_ui\Routing\RouteSubscriber.