I was thinking of this, if the backend handler would say "take me out of rotation for Xms as I'm about to do a garbage collection" and the load balancer would s

I was thinking of this, if the backend handler would say "take me out of rotation for Xms as I'm about to do a garbage collection" and the load balancer would see this and act on it. for http I'd imagine it can be a header. For https, I can imagine it might be harder.