What happened to the monthly contests?

The links and forum posts about the monthly contests seem to end in December 2016. I can't seem to find any discussion about them ending, however, and the seasonal contest posts still talk about them.

Are the monthly contests still a thing and they're just being posted in some corner of the site I've overlooked, or are they defunct?

My apologies if this is one of those "The answer is obvious if you only looked in the right place" kind of questions.

They stopped in 2016. The site's house-keeping isn't the best.

There was a point before they stopped for well over a year then starting I think in 2014 they came back and eventually caught up, but none last year.

They may have moved on from it or they may just be a year behind. The only thing for certain is if anyone is looking for the courtesy of an announcement one way or another, don't wait up.