https://wikistats.wmflabs.org/ gives the following status:
Error!: SQLSTATE[HY000]  No such file or directory
SIGH.. no idea why this was broken. there was recent WMCS maintenance though where instances were shut down.
Now it says
Error!: SQLSTATE[HY000]  Access denied for user 'wikistatsuser'@'localhost' (using password: YES)"
Unfortunately i currently don't have the access to get on that machine. I don't have my labs key with me, only in a backup somewhere else. @Paladox Could you maybe try to see if you get access to mysql root shell? Are the tables still there?
Fixed it with the remote hands of @Paladox .(Thanks!) The data_dir was set to the wrong location and we had to re-add GRANTs.
Going to run updates next.