Get prefixes where applicable

        Add metric prefix counters, timers respectively if
        :attr:`prepend_metric_type` flag is True.

        :param str metric_type: The metric type
        :rtype: list

def _get_prefixes(self, metric_type):
        """Get prefixes where applicable

        Add metric prefix counters, timers respectively if
        :attr:`prepend_metric_type` flag is True.

        :param str metric_type: The metric type
        :rtype: list

        """
        prefixes = []
        if self._prepend_metric_type:
            prefixes.append(self.METRIC_TYPES[metric_type])
        return prefixes