code: def get_project_activity_metrics(self, project, from_date, aggregation_type):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          query_parameters = {}
          if from_date is not None:
              query_parameters['fromDate'] = self._serialize.query('from_date', from_date, 'iso-8601')
          if aggregation_type is not None:
              query_parameters['aggregationType'] = self._serialize.query('aggregation_type', aggregation_type, 'str')
          response = self._send(http_method='GET',
                                location_id='e40ae584-9ea6-4f06-a7c7-6284651b466b',
                                version='5.0-preview.1',
                                route_values=route_values,
                                query_parameters=query_parameters)
          return self._deserialize('ProjectActivityMetrics', response)
docs: GetProjectActivityMetrics.
          [Preview API]
          :param str project: Project ID or project name
          :param datetime from_date:
          :param str aggregation_type:
          :rtype: :class:`<ProjectActivityMetrics> <azure.devops.v5_0.project_analysis.models.ProjectActivityMetrics>`