code: public Observable<List<AnnotationInner>> listAsync(String resourceGroupName, String resourceName, String start, String end) {
          return listWithServiceResponseAsync(resourceGroupName, resourceName, start, end).map(new Func1<ServiceResponse<List<AnnotationInner>>, List<AnnotationInner>>() {
              @Override
              public List<AnnotationInner> call(ServiceResponse<List<AnnotationInner>> response) {
                  return response.body();
              }
          });
      }
docs: Gets the list of annotations for a component for given time range.
  
  @param resourceGroupName The name of the resource group.
  @param resourceName The name of the Application Insights component resource.
  @param start The start time to query from for annotations, cannot be older than 90 days from current date.
  @param end The end time to query for annotations.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;AnnotationInner&gt; object