I fully support this request.
Otherwise we are blind when it comes to 521 errors. I think it’s in Cloudflare’s interest as well to have such a report of error, otherwise the end-user does not care where the error comes from and it might perceive it as also being the cause of Cloudflare.
Without this report I can’t go back to the hoster and ask for details, I need the ray id and the timestamp. Otherwise they will tell me they have nothing to investigate…
I recall having seen such a report in the past, maybe 6 months ago or even maybe more than one year, I have searched for it but couldn’t find it. I am 80% sure I’ve seen such a report on Cloudflare, thus I could be wrong… but this is what I recall.
Many thanks