6 files declare their use of ClassMetadataInterface in Zircon Profile 8

AnnotationLoader.php in vendor/symfony/serializer/Mapping/Loader/AnnotationLoader.php

ClassMetadataFactoryInterface.php in vendor/symfony/serializer/Mapping/Factory/ClassMetadataFactoryInterface.php

LoaderChain.php in vendor/symfony/serializer/Mapping/Loader/LoaderChain.php

LoaderInterface.php in vendor/symfony/serializer/Mapping/Loader/LoaderInterface.php

XmlFileLoader.php in vendor/symfony/serializer/Mapping/Loader/XmlFileLoader.php

YamlFileLoader.php in vendor/symfony/serializer/Mapping/Loader/YamlFileLoader.php