Fixed on enwikibooks by manually running the query.

This is just transitory. It will take 2 hours or less for other wikis to have stats back without intervention. I'll probably manually run the query to cut the time down.

alexsm333 wrote:

[[ru:Special:ValidationStatistics]] is still almost empty (just 1 line) and enwiki [[Special:ValidationStatistics]] too.

Something is wrong with the cron tab. The update script works fine running it manually.

+shell so someone can look at the cronjob.

Cron job was commented out, uncommented.