Deprecation: #83905 - TypoScriptFrontendController->page_cache_reg1 

See forge#83905

Description 

Property TypoScriptFrontendController->page_cache_reg1 has been marked as deprecated.

Impact 

Setting this property triggers a deprecation warning.

Affected Installations 

This property was of very little use ever since, it is unlikely an instance runs an extension consuming it. The extension scanner will find usages.

Migration 

Use method TypoScriptFrontendController->addCacheTags() to influence page cache tagging.