        ProtocolExtension(ExtensionName.Metadata, "ut_metadata", ExtensionType.Extension, ExtensionProtocolMessageType.Metadata, 0, True)
    ]

    @staticmethod
    def get_extension(name):
        filtered = [x for x in ProtocolExtensionManager.known_extensions if x.extension_name == name]
        if len(filtered) == 1:
            return filtered[0]
