agree it doesn't truly follow the memento pattern but it is close enough to the other uses of memento within brooklyn I think the name is okay, it just needs some docs which I'll add in #1368. (calling it a status or a record would be *less* helpful imho as it suggests a difference to the `loadMemento` pattern in `BrooklynMementoPersistence`.)  -- @alasdairhodge wdyt?