docs: def _warn_unsafe_for_prod(self):
          """Warn on settings that are not safe for production."""
          safe_settings_list = [
              ('DEBUG', False),
              ('DEBUG_GMN', False),
              ('STAND_ALONE', False),
              ('DATABASES.default.ATOMIC_REQUESTS', True),
              ('SECRET_KEY', '<Do not modify this placeholder value>'),
              ('STATIC_SERVER', False),
          ]
          for setting_str, setting_safe in safe_settings_list:
              setting_current = self._get_setting(setting_str)
              if setting_current != setting_safe:
                  logger.warning(
                      'Setting is unsafe for use in production. setting="{}" current="{}" '
                      'safe="{}"'.format(setting_str, setting_current, setting_safe)
                  )