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Background: Before this change, DeltaFIFO emits the Sync DeltaType on Resync() and Replace(). Seperately, the SharedInformer will only pass that event on to handlers that have a ResyncInterval and are due for Resync. This can cause updates to be lost if an object changes as part of the Replace(), as it may be incorrectly discarded if the handler does not want a Resync. What this change does: Creates a new DeltaType, Replaced, which is emitted by DeltaFIFO on Replace(). For backwards compatability concerns, the old behavior of always emitting Sync is preserved unless explicity overridden. As a result, if an object changes (or is added) on Replace(), now all SharedInformer handlers will get a correct Add() or Update() notification. One additional side-effect is that handlers which do not ever want Resyncs will now see them for all objects that have not changed during the Replace. Kubernetes-commit: ca1eeb99b530a6d76b464dad545abc18d4508c49