    def _log_app_versions(self):
        """Log application versions at startup

        Logs versions of jupyterhub and singleuser-server base versions (jupyterlab, jupyter_server, notebook)
        """
        self.log.info(
            f"Starting jupyterhub single-user server extension version {__version__}"
        )
Log application versions at startup

Logs versions of jupyterhub and singleuser-server base versions (jupyterlab, jupyter_server, notebook)
jupyterhub/singleuser/extension.py