Hah, that's awesome.

Now whether you could actually correlate that to an increase in errors for a particular component, no so much ;)

Yep, makes sense. I was picturing a broad "Something Bad Happened, Go Investigate" notification. But I imagine the sensitivity would have to be tuned, especially to account for massive traffic increases from places like HN.

Even worse, some applications would return a shared error page but internally, I believe it was logged as a 301 redirect until someone spotted it :)

Yikes!