It wasn’t on mine either before just a month or so ago. There was a Habitat for Humanity event happening in a town near here (Cookeville) where people could buy a “bowl” and sample anything on the street. There were probably 100 booths set up with lots of different kinds of food, mostly Cajun for this particular theme. My wife’s company had a booth set up that served bread pudding with either a vanilla sauce or a rum sauce. (I doubt there is any question which sauce was the most popular! They were both good.)
We spent most of the day before making 18 large pans of it. Real cream, real butter, real eggs, real sugar and a lot of stale bread. It wasn’t all that tempting making it but when the crowd slowed just a little, I had a taste. DANG, that was some good stuff! And with the rum sauce… DANG!!! Let’s just say we did not have one scrap left over. People were lined up for it. Even had one guy shout out that we had “crack”. LOL!! No, it wasn’t crack, but the rum sauce was a big draw. 
Anyway, since then, I’ve wondered if I could make something that was keto friendly. I think I could. But the bread part of it seems like it would be the hardest.