Hooks
Register the following hooks in ext_ of your extension.
excludeDoktype Hook
By adding doktype ids to following array you can exclude them from being crawled:
packages/my_extension/ext_localconf.php
$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['crawler']['excludeDoktype'][] = <dokTypeId>
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pageVeto Hook
Deprecated since version 11.0.0
Removed in 13.0, please migrate to the PSR-14 Event ModifySkipPageEvent!