How are "recommended apps" determined

I am unable to find documentation on how recommended apps (rest/2/addons/{addonKey}/recommendations) are determined. These appear to be the results that show up as “similar apps” on an add-ons page. Is anyone aware of where to get this information?

There is decent documentation on the determination of searches and rankings (https://developer.atlassian.com/platform/marketplace/marketplace-search-results-and-rankings), however, there I am unable to find information on recommended apps.

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