Manual:$wgSlaveLagWarning

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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[edit]

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