Manual:$wgDeprecationReleaseLimit

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Debug: $wgDeprecationReleaseLimit
Release limitation to wfDeprecated warnings.
Introduced in version:1.19.0 (r97136)
Removed in version:still in use
Allowed values:(string) or false
Default value:false

Details[edit]

Release limitation to wfDeprecated warnings. If set to a release number, development warnings will not be generated for deprecations added in releases after the given limit. Set to false to receive all deprecation notices.