Deprecation: #84045 - AdminPanel Hook deprecated 

See forge#84045

Description 

The hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_adminpanel.php']['extendAdminPanel'] has been marked as deprecated along with the corresponding interface \TYPO3\CMS\Frontend\View\AdminPanelViewHookInterface.

Impact 

Using either the interface or registering the hook will result in a deprecation warning and will stop working in future TYPO3 versions.

Affected Installations 

Installations using the \TYPO3\CMS\Frontend\View\AdminPanelViewHookInterface.

Migration 

Use the new admin panel module API starting with TYPO3 v9.2.