def get_multiple(
            self, app_id, body, custom_headers=None, raw=False, **operation_config):
        """Retrieve metric data.

        Gets metric values for multiple metrics.

        :param app_id: ID of the application. This is Application ID from the
         API Access settings blade in the Azure portal.
        :type app_id: str
        :param body: The batched metrics query.
        :type body:
         list[~azure.applicationinsights.models.MetricsPostBodySchema]
        :param dict custom_headers: headers that will be added to the request
        :param bool raw: returns the direct response alongside the
         deserialized response
        :param operation_config: :ref:`Operation configuration
         overrides<msrest:optionsforoperations>`.
        :return: list or ClientRawResponse if raw=true
        :rtype: list[~azure.applicationinsights.models.MetricsResultsItem] or
         ~msrest.pipeline.ClientRawResponse
        :raises:
         :class:`ErrorResponseException<azure.applicationinsights.models.ErrorResponseException>`
        """
        # Construct URL
        url = self.get_multiple.metadata['url']
        path_format_arguments = {
            'appId': self._serialize.url("app_id", app_id, 'str')
        }
        url = self._client.format_url(url, **path_format_arguments)

        # Construct parameters
        query_parameters = {}

        # Construct headers
        header_parameters = {}
        header_parameters['Accept'] = 'application/json'
        header_parameters['Content-Type'] = 'application/json; charset=utf-8'
        if custom_headers:
            header_parameters.update(custom_headers)

        # Construct body
        body_content = self._serialize.body(body, '[MetricsPostBodySchema]')

        # Construct and send request
        request = self._client.post(url, query_parameters, header_parameters, body_content)
        response = self._client.send(request, stream=False, **operation_config)

        if response.status_code not in [200]:
            raise models.ErrorResponseException(self._deserialize, response)

        deserialized = None

        if response.status_code == 200:
            deserialized = self._deserialize('[MetricsResultsItem]', response)

        if raw:
            client_raw_response = ClientRawResponse(deserialized, response)
            return client_raw_response

        return deserialized
Retrieve metric data.

        Gets metric values for multiple metrics.

        :param app_id: ID of the application. This is Application ID from the
         API Access settings blade in the Azure portal.
        :type app_id: str
        :param body: The batched metrics query.
        :type body:
         list[~azure.applicationinsights.models.MetricsPostBodySchema]
        :param dict custom_headers: headers that will be added to the request
        :param bool raw: returns the direct response alongside the
         deserialized response
        :param operation_config: :ref:`Operation configuration
         overrides<msrest:optionsforoperations>`.
        :return: list or ClientRawResponse if raw=true
        :rtype: list[~azure.applicationinsights.models.MetricsResultsItem] or
         ~msrest.pipeline.ClientRawResponse
        :raises:
         :class:`ErrorResponseException<azure.applicationinsights.models.ErrorResponseException>`