I am relatively new to Alteryx, but to my knowledge it does not seem like you are able to create aggregate data alerts that link two data columns to each other.
My suggestion is the following: Enable Alteryx to create a data alert so if you are creating a warehouse overview (as an example) you can set an alert whenever the quantity of an item is equal to its minimum stock
Alert when: Quantity = Minimum stock
Thus, whenever your quantity is reaching a critical level, you would receive an alert either through Alteryx, in Tableau (which I use to mediate my Alteryx data) or by email.