I don't think it has much to do with virtualization, if I'm understanding correctly. You can think of it as the inverse of what your replay tool does. If you th

I don't think it has much to do with virtualization, if I'm understanding correctly. You can think of it as the inverse of what your replay tool does. If you think of a service that does transformations on data: Req --> Service --> Rep Your replay service is a synthetic Req. I think the parent is proposing synthetic Rep. This can be useful in many scenarios where you effectively want to mock a downstream service.