Links to rads.stackoverflow.com are used to redirect (e.g. to Amazon) to add Stack Exchange's affiliate cookie. I just saw a site member on "my" site mention that the redirect was failing, and it currently is. This might be a new issue, after the recent move of SO to GCP (and associated changes).
For example, clicking on this (innocent!) link:
https://rads.stackoverflow.com/amzn/click/com/B09LVFHTXH
should redirect to an Amazon product page, but instead shows a long error page which starts with:
but despite the claim on that page, Stack Overflow is not down.
So this seems to be a bug with rads.stackoverflow.com
Can the relevant folks please investigate?

amazon.comlinks in Q/A/C (which silently redirect viarads.stackoverflow.com) are still broken :(