Manual:$wgPriorityHints

Miscellaneous settings: $wgPriorityHints
Enable client-side Priority Hints.
Introduced in version:1.33.0 (Gerrit change 491751; git #8e11c5d)
Removed in version:1.39.0 (Gerrit change 793396; git #0d90560e)
Allowed values:(boolean)
Default value:false

See also edit