Deprecation: #85678 - config.titleTagFunction 

See forge#85678

Description 

The TypoScript option config.titleTagFunction has been marked as deprecated and will be removed with TYPO3 v10.

Impact 

Installations using the option will trigger a PHP E_USER_DEPRECATED error.

Affected Installations 

Instances using the option.

Migration 

Please use the new PageTitle API to alter the title tag.