def get_metrics_data_relay(self, name, relay_name, metric, rollup, filter_expresssion):
        '''
        Retrieves the list of supported metrics for this namespace and relay

        name:
            Name of the service bus namespace.
        relay_name:
            Name of the service bus relay in this namespace.
        metric:
            name of a supported metric
        rollup:
            name of a supported rollup
        filter_expression:
            filter, for instance "$filter=Timestamp gt datetime'2014-10-01T00:00:00Z'"
        '''
        response = self._perform_get(
            self._get_get_metrics_data_relay_path(name, relay_name, metric, rollup, filter_expresssion),
            None)

        return _MinidomXmlToObject.convert_response_to_feeds(
            response,
            partial(
                _ServiceBusManagementXmlSerializer.xml_to_metrics,
                object_type=MetricValues
            )
        )
Retrieves the list of supported metrics for this namespace and relay

        name:
            Name of the service bus namespace.
        relay_name:
            Name of the service bus relay in this namespace.
        metric:
            name of a supported metric
        rollup:
            name of a supported rollup
        filter_expression:
            filter, for instance "$filter=Timestamp gt datetime'2014-10-01T00:00:00Z'"