Deprecation: #83905 - TypoScriptFrontendController->page_cache_reg1

See Issue #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.