Manual:$wgPriorityHintsRatio

Miscellaneous settings: $wgPriorityHintsRatio
Ratio of requests that should get Priority Hints when the feature is enabled.
Introduced in version:1.34.0 (Gerrit change 499767; git #7433fa9)
Removed in version:1.39.0 (Gerrit change 793396; git #0d90560e)
Allowed values:(float)
Default value:1.0

See also edit