In a scale in scenario, where a destination is removed from config, how can I detect when active connections are drained so I can terminate the server?

[cbortos-d2l]

When scaling in a cluster, I programmatically change the YARP config and remove the destination from the cluster.
I understand that the DestinationState will still live until all connections are drained.
Knowing the cluster id and the destination id, would something like this work?

private IProxyStateLookup _proxyStateLookup;

public bool TryGetDestination(string clusterId, string destinationId, out WeakReference<DestinationState>? destination)
{
	if(_proxyStateLookup.TryGetCluster(clusterId, out ClusterState? cluster))
	{
		if(cluster.Destinations.TryGetValue(destinationId, out DestinationState? destinationState))
		{
			destination = new(destinationState);
			return true;
		}
	}

	destination = null;
	return false;
}

If I don't get the destination, I can assume that it has drained and the state object was released.
If I get the destination, I can then check the destination's ConcurrentRequestCount value.

Can you let me know if this would work?
Thank you