def get_metrics(self, metric_identifiers, from_date, limit=10, group_by="week", **kwargs):
        raise NotImplementedError()
Return a dt/dd item.
dataset/ETHPy150Open numan/py-analytics/analytics/backends/base.py/BaseAnalyticsBackend.get_metrics--crossover with--dataset/ETHPy150Open mitsuhiko/fungiform/fungiform/widgets.py/Widget.as_dd