As User:Minderbinder already reported earlier on this page, the German Wikipedia community held a vote on the question whether the WikiWho tool in XTools should be linked from each article, in order to make article authorship prominently visible to readers. The vote ended five days ago, and the link was subsequently added to the desktop UI page footer via de:MediaWiki:Wikimedia-copyright. Pretty much directly after the link was added, the tool started to fail showing authorship data; instead, it displays an error message
Error querying Wikiwho API: Unknown for most of the requests.
There are several users on German Wikipedia complaining about this problem, and there is some speculation that there may be simply too many requests so that a request quota to the WikiWho server might be exceeded most of the time.
Can you please give some insight into the problem? What can be done to fix this situation?
(I have no idea whether someone else has already contacted you; if that is the case, please link to related discussions.)