Manual:$wgDataCenterUpdateStickTTL

Database settings: $wgDataCenterUpdateStickTTL
After a state-changing request is done by a client, this determines how many seconds that client should keep using the master datacenter.
Introduced in version:1.27.0 (Gerrit change 232661; git #0a1c04be)
Removed in version:still in use
Allowed values:(integer)
Default value:10