Looks like a pretty serious problem in Europe region with 502 HTTP errors:
Is anyone else having issues with HTTP 502 errors (Bad Gateway) in Europe right now?
My application just stopped responding, including the /healthcheck (but Render says the Health Check is still returning 200 )
Tried re-deploying (and it says it was successful), but still 502 on my end…
Also posted this to Slack: https://render-community.slack.com/archives/CH85FC7PY/p1606484833441100