The CoreDNS Black Hole: how one dead DNS pod broke our API gateway

Our API gateway started handing this back to roughly a third of all requests: {"source":"auth","message":"Upstream Service Unavailable","error":"Upstream Service unreachable"} Restart the gateway and everything is fine. A day later, it's back. No deploy, no code change, no traffic spike, nothing in the backend logs — the backends were healthy the... Weiterlesen