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I have a custom attribute that I need to observe after the mass update product has been finished, this custom attribute is related to a category in another custom table, so if this custom attribute value changed I need to assign a new category id to the product. My question is what observer or plugin is suitable for this kind of action? i also need to get the previous attribute value and the new attribute value

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You can use catalog_product_attribute_update_before event for this.

In file /vendor/magento/module-catalog/Model/Product/Action.php this event has been dispatched before updating the products.

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