I was doing some work, making some calls against my service, with no change to code or deployment. The service was running for past 24 hours with lots of calls against it and no problems. I somehow found myself in a situation where any GET request to an entity now fails with a 503:
HTTP/2 503 upstream connect error or disconnect/reset before headers. reset reason: remote refused stream reset
There is no information in any logs to help me here. How should one proceed with debugging?