Does this or any of the strategies listed in the comments properly handle long lived client connections? It's sufficient enough to wait for the LB to stop sending traffic when connections are 100s of ms or less but when connections are minutes or even hours long it doesn't work out well.

Is there a slick strategy for this? Is it possible to have minutes long pre-stop hooks? Is the only option to give client connections an abandon ship message and kick them out hopefully fast enough?