code: public Observable<Page<IotHubQuotaMetricInfoInner>> getQuotaMetricsNextAsync(final String nextPageLink) {
          return getQuotaMetricsNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<IotHubQuotaMetricInfoInner>>, Page<IotHubQuotaMetricInfoInner>>() {
                  @Override
                  public Page<IotHubQuotaMetricInfoInner> call(ServiceResponse<Page<IotHubQuotaMetricInfoInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Get the quota metrics for an IoT hub.
  Get the quota metrics for an IoT hub.
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;IotHubQuotaMetricInfoInner&gt; object