Depending on the need, it can be implemented on client side as well as on chitchat. We actually thought of this feature as a way for a node to normaly exclude i

Depending on the need, it can be implemented on client side as well as on chitchat. We actually thought of this feature as a way for a node to normaly exclude itself from the cluster (maybe for application update). We are still evaluating how necessary this is because a node crash or normal shutdown can just work. Future experience will surely tell us.