Manual:$wgCdnMaxageStale

Squid: $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