code: func (c *AggregationController) AddAPIService(handler http.Handler, apiService *apiregistration.APIService) {
  	if apiService.Spec.Service == nil {
  		return
  	}
  	if err := c.openAPIAggregationManager.AddUpdateAPIService(handler, apiService); err != nil {
  		utilruntime.HandleError(fmt.Errorf("adding %q to AggregationController failed with: %v", apiService.Name, err))
  	}
  	c.queue.AddAfter(apiService.Name, time.Second)
  }
docs: // AddAPIService adds a new API Service to OpenAPI Aggregation.