Hi, Figured this out (my reply might not be threaded, the mailing list daemon doesn't add me after I confirm my subscription)
It was https://github.com/haproxy/haproxy/commit/30ee1efe676e8264af16bab833c621d60a72a4d7 in haproxy 2.1 that caused this change. It's deliberate but the documentation wasn't updated to match. I found this by bisecting between 2.0 and 2.1 after noticing that only HTTP/2 requests were being logged this way. B.
