code: public Observable<ServiceResponse<List<AzureSkuInner>>> listSkusWithServiceResponseAsync() {
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          return service.listSkus(this.client.subscriptionId(), this.client.apiVersion(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<List<AzureSkuInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<List<AzureSkuInner>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<PageImpl<AzureSkuInner>> result = listSkusDelegate(response);
                          List<AzureSkuInner> items = null;
                          if (result.body() != null) {
                              items = result.body().items();
                          }
                          ServiceResponse<List<AzureSkuInner>> clientResponse = new ServiceResponse<List<AzureSkuInner>>(items, result.response());
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Lists eligible SKUs for Kusto resource provider.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;AzureSkuInner&gt; object