Editor's note: This is not a duplicate of Now you can know if a question really hit the HNQ. This asks for a notification when a question hits HNQ; the revision history item mentioned in the other post does not satisfy this request.
On smaller sites, questions that make the network-wide "hot questions" list receive disproportionate amounts of traffic and, sadly, comments and answers we'd like to monitor rather closely. Also, these questions should be cleaned up to be as presentable as possible (choice of title, formatting, spelling, obsolete or spurious comments, ...).
Currently, there is no way to know that a question is "hot" besides noticing the effects and checking the list on stackexchange.com. This is rather unsatisfying.
Please let moderators (and maybe 10k?) know when a question goes "hot" instantly, via inbox notification. We already have the small diamond which notifies us of (more or less) important things; one message more every few days would fit in nicely there.
https://stackexchange.com/has an RSS feed for hot questions. It should be easy to monkey some tool together that monitors that feed and sends notifications in some way.