Not sure how you'd configure it, but you don't actually need a canonical source. You just compare it against all/many other servers and look at the difference.

Not sure how you'd configure it, but you don't actually need a canonical source. You just compare it against all/many other servers and look at the difference. If there's any real skew you need to look at all of them that had a difference then but you don't need a canonical source anymore.