'ArticlePurge': before executing "&action=purge"
$article: article (object) to purge
+'ArticleRevisionUndeleted' after an article revision is restored
+$title: the article title
+$revision: the revision
+$oldPageID: the page ID of the revision when archived (may be null)
+
'ArticleRollbackComplete': after an article rollback is completed
$article: the article that was edited
$user: the user who did the rollback