private IEnumerable<CounterDesc> GetAllDescs()
{
return _counterDescs
.Concat(CounterDesciptors)
.Concat(_methodDescs.Concat(MethodCounterDesciptors).SelectMany(desc => desc.CreateDescriptors()))
.Concat(_instanceDescs.Concat(InstanceCounterDesciptors).SelectMany(desc => desc.CreateDescriptors()));
}