def load_extra_yaml(self, env, silent, key):
        """This is deprecated, kept for compat

        .. deprecated:: 1.0.0
            Use multiple settings or INCLUDES_FOR_DYNACONF files instead.
        """
        if self.get("YAML") is not None:
            warnings.warn(
                "The use of YAML var is deprecated, please define multiple "
                "filepaths instead: "
                "e.g: SETTINGS_FILE_FOR_DYNACONF = "
                "'settings.py,settings.yaml,settings.toml' or "
                "INCLUDES_FOR_DYNACONF=['path.toml', 'folder/*']"
            )
            yaml_loader.load(
                self,
                env=env,
                filename=self.find_file(self.get("YAML")),
                silent=silent,
                key=key,
            )
This is deprecated, kept for compat

        .. deprecated:: 1.0.0
            Use multiple settings or INCLUDES_FOR_DYNACONF files instead.
        
dynaconf/base.py