Assuming I've got a graph stage, is it possible to retry the previous stage or wrap a stage in some logic. Essentially I'm thinking of the case where I get a 500 back from a web server. I'm using Polly to do this, as it will provide caching in the future, so would like to continue with this. I've looked at the Deciders and it appears I can't do what I want with those, i.e wait for a period of time if a failure occurs as I could in Akka. I could add my retry logic to each stage individually, but given it's a reusable piece, I don't want to have to write it more than once!