code: public Observable<ExpressRouteCircuitStatsInner> getStatsAsync(String resourceGroupName, String circuitName) {
          return getStatsWithServiceResponseAsync(resourceGroupName, circuitName).map(new Func1<ServiceResponse<ExpressRouteCircuitStatsInner>, ExpressRouteCircuitStatsInner>() {
              @Override
              public ExpressRouteCircuitStatsInner call(ServiceResponse<ExpressRouteCircuitStatsInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets all the stats from an express route circuit in a resource group.
  
  @param resourceGroupName The name of the resource group.
  @param circuitName The name of the express route circuit.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ExpressRouteCircuitStatsInner object