Dump counters as a dict

def to_dict(self, get_value=None):
        """Dump counters as a dict"""
        self.trim()
        result = {}
        for key, value in iteritems(self.counters):
            if get_value is not None:
                value = getattr(value, get_value)
            r = result
            for _key in key[:-1]:
                r = r.setdefault(_key, {})
            r[key[-1]] = value
        return result