The full details are a bit unclear to me, but as far as I understand it, https://wikimediafoundation.org/wiki/Special:FundraiserStatistics was linked from reddit and due to the feature's implementation, it caused excessive database load through long-running queries. This excessive load eventually took down the main wiki sites and the extension was consequently disabled: http://wikitech.wikimedia.org/index.php?title=Server_admin_log&diff=40583&oldid=40582.
The extension should be optimized and re-enabled. There are already questions about the page's disappearance (cf. https://meta.wikimedia.org/w/index.php?title=Foundation_wiki_feedback&oldid=3109621#Why.2C_why.2C_why).
Until the extension is re-enabled, it would be nice if the link didn't display such a terrible error message. "You have requested an invalid special page." isn't accurate; the user has requested a disabled special page due to a special set of circumstances.
Related mailing list posts:
- http://lists.wikimedia.org/pipermail/wikitech-l/2011-November/056604.html
- http://lists.wikimedia.org/pipermail/wikitech-l/2011-November/056606.html
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