def METHOD_NAME(self, tracker: DialogueStateTracker) -> Iterator:
    events = self.get_stored_events(tracker.sender_id, False)
    if events:
        number_events_since_last_session = len(events)
        return itertools.islice(
            tracker.events, number_events_since_last_session, len(tracker.events)
        )
    else:
        return tracker.events