|Recent changes, new pages, watchlist and history: $wgWatchlistPurgeRate|
|The per-edit rate at which expired watchlist items will be purged from the database.
|Introduced in version:||1.35.0 (Gerrit change 572147; git #83804ad)|
|Removed in version:||still in use|
|Allowed values:||0.0–1.0 (float)|
|Other settings: Alphabetical | By function|
Chance of expired watchlist items being purged on any page edit.
Only has effect if $wgWatchlistExpiry is true.
If this is zero, expired watchlist items will not be removed and the purgeExpiredWatchlistItems.php maintenance script should be run periodically.