Server::Configuration::ServerFactoryContext& factory_context) {

  const auto& matcher_config = MessageUtil::downcastAndValidate<

      const envoy::extensions::matching::input_matchers::metadata::v3::Metadata&>(

      config, factory_context.messageValidationVisitor());

  const auto& value = matcher_config.value();

  const auto value_matcher = Envoy::Matchers::ValueMatcher::create(value, factory_context);

  const bool invert = matcher_config.invert();

  return [value_matcher, invert]() { return std::make_unique<Matcher>(value_matcher, invert); };

}