I get this from the error log all the time.

Cron Failure catalog_product alert:


exception 'Mage_Core_Exception' with message 'Invalid callback: Model for productalert/observer::process does not exist' in Mage.php:598

This is line 598: throw new Mage_Core_Exception($message); and this is the entire section of

     * Throw Exception
     * @param string $message
     * @param string $messageStorage
     * @throws Mage_Core_Exception
    public static function throwException($message, $messageStorage = null)
        if ($messageStorage && ($storage = self::getSingleton($messageStorage))) {
        throw new Mage_Core_Exception($message);

productalert/observer::process no longer exists.

Search codebase for productalert. XML is making magento look for


public function process() {

productalert will be in XML. https://devdocs.magento.com/guides/m1x/magefordev/mage-for-dev-5.html

There is a refence to this event in XML too under <events> node in XML

Magento 1.9 how to create custom events


Turned out Mage_ProductAlert was false in /app/etc/modules/Mage_All.xml. Change to true and the error not showing anymore.

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