As of MediaWiki 1.16.0 this extension is obsolete due to core functionality for
revision deletion (oversight) [1]. As such, new installations of this extension are
redundant. This extension is not actively maintained, and is only really kept around
and maintained as it is still somewhat used on Wikimedia Wikis.

Migration of any revisions hidden by the Oversight extension can be migrated to using
revision delete by using the migrateToRevDel.php maintenance script that exists in the
extension directory.

[1] https://www.mediawiki.org/wiki/Manual:RevisionDelete