The impression that A has been seen is generated > When a specific event does not occur for +n seconds at the time of occurrence of A (eventTs) > generate Event I want to implement this flow, but I can't come up with a way. Any advice or ideas??

A couple approaches: • "no gap greater than" aka session windows • set/reset a timer (hopefully per key, not global!) every time an event arrives, and produce output when the timer fires