@Override
    public void update(InvocationStat snapshot) {
        invokeCount.addAndGet(-snapshot.getInvokeCount());
        exceptionCount.addAndGet(-snapshot.getExceptionCount());
    }
Sets server exception.

@param count the count
fault/fault-tolerance/src/main/java/com/alipay/sofa/rpc/client/aft/impl/AbstractInvocationStat.java