docs: def write_multi(self, data):
          """Write a set a datapoints into multiple series by key or series ID.
          Each :class:`tempodb.protocol.objects.DataPoint` object should have
          either a key or id attribute set that indicates which series it will
          be written into::
  
              [
                  {"t": "2012-...", "key": "foo", "v": 1},
                  {"t": "2012-...", "id": "bar", "v": 1}
              ]
  
          If a non-existent key or ID is passed in, a series will be created
          for that key/ID and the data point written in to the new series.
  
          :param list data: a list of DataPoints to write
          :rtype: :class:`tempodb.response.Response` object"""
  
          url = 'multi/'
  
          dlist = [d.to_dictionary() for d in data]
          body = json.dumps(dlist)
          resp = self.session.post(url, body)
          return resp