It has been around since at least 2010 [1], and there was a more official release in mid 2013 [2].

[1] https://meta.stackexchange.com/a/69436/169404

[2] https://meta.stackexchange.com/a/197549/169404

We tried it a while ago, but we re-launched it with a much more updated solution about a year and a half ago. And it now has a dedicated ongoing team.