<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_ga_tracking_id(self):
 """ Retrieve tracking ID from settings """

        if hasattr(settings, self.ga_tracking_id_settings_key):
            return getattr(settings, self.ga_tracking_id_settings_key)
        return super(GARequestErrorReportingMixin, self).get_ga_tracking_id()