Manual:$wgSlaveLagWarning

LoadBalancer settings: $wgSlaveLagWarning
If lag is higher than this value, show a warning in some special pages (like watchlist).
Introduced in version:1.11.0 (r22310)
Removed in version:1.36.0 (Gerrit change 673678; git #20fc8057)
Allowed values:(integer)
Default value:10

Details

If lag is higher than this value, show a warning in some special pages (like watchlist).