Manual:$wgMetadataWhitelist

Site customization: $wgMetadataWhitelist
Full name (including namespace) of the page containing templates names that will be allowed as metadata.
Introduced in version:1.5.0 (r6887)
Removed in version:1.16.0
Allowed values:(string)
Default value:''

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Full name (including namespace) of the page containing templates names that will be allowed as metadata. This setting exists since r6887 but has only been added in DefaultSettings.php in r40925.