It was a limitation before but maybe not soon (they would have already mentioned it). Knative in your own cluster supports it but I want scale to zero instead

It was a limitation before but maybe not soon (they would have already mentioned it). Knative in your own cluster supports it but I want scale to zero instead of paying for a cluster. They say that it supports sockets but not bi-directional. You can't send messages back up the socket which we're using for GQL mutations