code: public Observable<ExpressRouteCircuitStatsInner> getPeeringStatsAsync(String resourceGroupName, String circuitName, String peeringName) {
          return getPeeringStatsWithServiceResponseAsync(resourceGroupName, circuitName, peeringName).map(new Func1<ServiceResponse<ExpressRouteCircuitStatsInner>, ExpressRouteCircuitStatsInner>() {
              @Override
              public ExpressRouteCircuitStatsInner call(ServiceResponse<ExpressRouteCircuitStatsInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets all 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.
  @param peeringName The name of the peering.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ExpressRouteCircuitStatsInner object