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$this->eventmanager->addEventHandler(
    'crm',
    '\Bitrix\Crm\Timeline\Entity\Timeline::OnAfterAdd',
    function  (\Bitrix\Main\Entity\Event $event) {
$application = \Bitrix\Main\Application::getInstance();
$request = $application->getContext()->getRequest();

$ownerTypeID = $request->getPost('OWNER_TYPE_ID');
$ownerID = $request->getPost('OWNER_ID');

switch ($ownerTypeID) {
    case \CCrmOwnerType::Lead :
        /* своя логика */
        break;
    case \CCrmOwnerType::Deal :
        /* своя логика*/
        break;
    case // остальные сущности
}
);