Lead:
POCs:
Summary:
The startAfter option is being added in order to convey intent to users about the creation of a new change stream based on an pre-existing resume token from a collection that has been invalidated. Creating a change stream with the startAfter parameter specified in the $changeStream stage will open a cursor opportunistically, and wait for the collection to be come available. In this sense, startAfter provides a way for users to never miss a single event.
Final Specification:
https://github.com/mongodb/specifications/commit/830715cd8a84da9c5582617a3e3a7d40171aa5f8