=== Deprecations in 1.40 ===
* Changes to skins:
  - The public Skin::footerLink is deprecated.
    Use SkinComponentMenuLink::getTemplateData instead.
    It now emits deprecation warnings.

This is now spamming the server log with the deprecation warning.

related documentation wiki page:
https://www.mediawiki.org/wiki/Manual:Footer

Still shows the old method.

SkinComponentMenuLink::getTemplateData is currently undocumented.

Could you document how to use SkinComponentMenuLink::getTemplateData please?