def track_change(self, instance, resolution_level=0):
        """
        Change tracking options for the already tracked object 'instance'.
        If instance is not tracked, a KeyError will be raised.
        """
        tobj = self.objects[id(instance)]
        tobj.set_resolution_level(resolution_level)
Change tracking options for the already tracked object 'instance'.
        If instance is not tracked, a KeyError will be raised.