Manual:$wgShowRollbackEditCount

Details
The $wgShowRollbackEditCount variable is used to show how many edits will be rollback. The numeric value of the varible are the limit up to are counted. If the value is false or 0, the edits are not counted. When $wgMiserMode is set, edits are always not counted on Special:RecentChanges and Special:Watchlist.