That is exactly what I would recommend doing. The meta map passed to your handler will have both max_attempts and the attempt field. You can easily check if retries have been exhausted and send your alert to the user.
The table at the top of Oban.Telemetry docs has a breakdown of all the fields passed to each event. (Though now that I liked to it I see a typo, it is max_attempts plural, not max_attempt)
