Looking at http://meta.stackexchange.com/q/157121/217863, it seems that notification is given when a review audit has been failed.

![enter image description here][1]

Looking at http://meta.stackexchange.com/questions/158675/why-am-i-getting-the-message-youve-failed-too-many-recent-review-audits?rq=1 it also appears that notification is given if you receive a review ban.

![enter image description here][2]


  [1]: https://i.sstatic.net/fKYEP.png
  [2]: https://i.sstatic.net/xj5X3.png