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I would assume it's in database index order, so not something that's externally observable but probably related to insertion order generally. There's an

order by

clause you can use to influence the order in the output though: https://www.puppet.com/docs/puppetdb/7/api/query/v4/pql.html#order-by

cool, thanks. Order by will suffice in ensure the output is always in lexographical order by certname