ext_localconf.php

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<?php
defined('TYPO3_MODE') or die();

if (TYPO3_MODE === 'BE' && !(TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_INSTALL)) {
    $signalSlotDispatcher = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\SignalSlot\Dispatcher::class);
    $signalSlotDispatcher->connect(
        \TYPO3\CMS\Backend\Backend\ToolbarItems\SystemInformationToolbarItem::class,
        'loadMessages',
        \TYPO3\CMS\Belog\Controller\SystemInformationController::class,
        'appendMessage'
    );
}