502 bad gateway instead of zero-downtime deploy

From 12:37:21 CET until 12:46:21 CET my app responded with a 502 Bad Gateway error message. The request ID was 76b415df96dd5b9e-FRA. For that duration, the logs only show the Render health check requests every 5 seconds. And the app seems to be ok, responding with HTTP 200 everytime.

At 12:36:16 CET the event log shows a successful deploy: “your service is live”.

It seems that the transition between old and new deploy wasn’t flawless.

The service ID is srv-c8oq3bn6d9kr1poacnbg.