Manual:$wgCdnMaxageStale

HTTP proxy (CDN) settings: $wgCdnMaxageStale
Cache timeout in seconds when delivering a stale ParserCache response due to PoolCounter contention.
Introduced in version:1.35.0 (Gerrit change 602284; git #7f710a51)
Removed in version:Still in use
Allowed values:(positive integer)
Default value:10