def _weigh_object(self, cell, weight_properties):

        last_seen = cell.last_seen
        secs = CONF.cells.mute_child_interval

        if timeutils.is_older_than(last_seen, secs):
            # yep, that's a mute child;  recommend highly that it be skipped!
            LOG.warning(_LW("%(cell)s has not been seen since %(last_seen)s "
                            "and is being treated as mute."),
                        {'cell': cell, 'last_seen': last_seen})
            return self.MUTE_WEIGH_VALUE
        else:
            return 0
Check cell against the last_seen timestamp that indicates the time
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/cells/weights/mute_child.py/MuteChildWeigher._weigh_object