Mysteriously, the link in Google Webmaster Tools to author stats has been removed.
Author Stats was introduced in December 2011 as a way to give authors a way to tracking impressions and clicks on their stories via Google Webmaster Tools.
Here is one of the reports given to authors:
Now when you open up Google Webmaster Tools and clicks on the side bar navigation to see the various tools and reports, "author stats" seems to be no where found.
A WebmasterWorld thread spotted the issue last night. I am sure it is just temporary although, this feature never worked properly for me anyway.
Forum discussion at WebmasterWorld.
Update: Google's Pierre Far responded to me on Google+ about this issue saying it was removed. He said:
We've currently disabled the experimental Author stats feature in Webmaster Tools Labs as we work to fix a bug in the way stats are attributed.