Backend service down detected by health check

Backend service health check reports server unavailable (traefik_service_server_up == 0) for 1 minute, causing request failures and service degradation.

Check if the backend pod is running: kubectl get pods -n <namespace> -l <service-selector>. Review backend service logs for errors or crashes. Verify the service port configuration matches the backend container port in IngressRoute. Check backend readiness and liveness probes. Verify network policies allow traffic from Traefik namespace to backend namespace.