Any word on whether this will be supported for classic? I had a friend ask me if I'd make an addon for classic, that tracks instance lockouts. I found this addon that already does just that, but only for retail.

I would like a no. There are so many features that don't exists in classic, but if you want to make it work in classic, feel free to try it and pr.

I'd be happy to give it a go, but I've been unable to find anyone who can tell me where the official Lua documentation is located at.

https://www.lua.org/ is official but no infomation from wow. I suggest resources channel in WeakAuras Discord (https://discord.gg/wa2)

And closing this :)