I don't think I know what that might exactly mean - I know we have synthetic traffic generation tools (and thus, measurements generated from the synthetic traffic), but I think those exhibit the same variance as production -> the backend for them are the same cloud IaaS systems and SW, so there's no 'sandboxed from all outside variance'.
If it means something else then I'm not aware if we do it or not.
If it means something else then I'm not aware if we do it or not.