Our solution for this is to have nebulous time sucks that need to be done, but don't have a ticket with an estimate. Like "increase test coverage" or "experime

Our solution for this is to have nebulous time sucks that need to be done, but don't have a ticket with an estimate. Like "increase test coverage" or "experiment with new things for a git hook to do" or "eliminate warnings". There's no deadline, and everything else is higher priority- but when you finish your sprint early, now you know what you can work on. And it's useful, not just scutwork.