def from_service_account_file(cls, filename: str, *args, **kwargs):
        """Creates an instance of this client using the provided credentials
            file.

        Args:
            filename (str): The path to the service account private key json
                file.
            args: Additional arguments to pass to the constructor.
            kwargs: Additional arguments to pass to the constructor.

        Returns:
            MetadataServiceAsyncClient: The constructed client.
        """
        return MetadataServiceClient.from_service_account_file.__func__(MetadataServiceAsyncClient, filename, *args, **kwargs)  # type: ignore