OnReplaySuccess is a virtual method which will be called when the recovery cycle ends successfully. OnReplayFailure is a virtual method which will be called when the recovery cycle fails unexpectedly from some reason.
Took a quick look at it. We already tagged @Horusiath who is the original author. I know he's on vacation. Not sure when he'll be back. But ill forward your concerns to the rest of the core team, and see what we can do.
I have created a round-robin-pool, but now i want to stop it, so I tried GracefulStop(), and I tried sending it a poison pill, and i tried sending it a broadcast poison pill, but it never shuts down the actors