[Whitestrake]

IANAL, but I could set my own completely custom user agent - I don't even need much technical expertise, a simple browser add-on would suffice - and by logging that string, I could be (depending on how unique I made my own user agent) uniquely identified.

Out of all the metrics Caddy plans to collect, it's the only one I think has some merit to its complainants. It might be simpler to only keep user agents that conform to common browser standards. But this has all been discussed in the Caddy forum thread itself, and we'd welcome your input there!