code: public Observable<ServiceResponse<Integer>> getUntaggedImageCountWithServiceResponseAsync(UUID projectId, GetUntaggedImageCountOptionalParameter getUntaggedImageCountOptionalParameter) {
          if (projectId == null) {
              throw new IllegalArgumentException("Parameter projectId is required and cannot be null.");
          }
          if (this.client.apiKey() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiKey() is required and cannot be null.");
          }
          final UUID iterationId = getUntaggedImageCountOptionalParameter != null ? getUntaggedImageCountOptionalParameter.iterationId() : null;
  
          return getUntaggedImageCountWithServiceResponseAsync(projectId, iterationId);
      }
docs: Gets the number of untagged images.
  This API returns the images which have no tags for a given project and optionally an iteration. If no iteration is specified the
  current workspace is used.
  
  @param projectId The project id
  @param getUntaggedImageCountOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Integer object