'Gets all the metrics for a specified key.
:param key: name of the metric
:type key: C{str}
:return: C{dict}'

def get_metrics(self, key):

    metrics = {}
    for getter in (self._get_counter_metrics, self._get_histogram_metrics, self._get_meter_metrics, self._get_timer_metrics, self._get_gauge_metrics):
        metrics.update(getter(key))
    return metrics
