[redis_mlc]

> I have never observed a “utm” query param actually improve the quality of the response.

You have it backwards. It's more tracking for the webmaster/marketer to know what was popular and what wasn't.

[spike021]

Reminds me of a time at my previous job where I was asked to add a utm_source to API client calls for one specific type of client. Less for marketing, more for just the product management side.

[monadic2]

Yes, and despite being easily strippable this functionality is preserved, intentionally, by browsers.