def METHOD_NAME(self, metric_id, random_id=None):
    sack = self.sack_for_metric(metric_id)
    path = self._measure_path(sack, metric_id)
    if random_id:
        if random_id is True:
            now = datetime.datetime.utcnow().strftime("_%Y%m%d_%H:%M:%S")
            random_id = str(uuid.uuid4()) + now
        return os.path.join(path, random_id)
    return path