Metriche repository
- Star
- (27.997 star)
- Metriche merge PR
- (Merge medio 8g) (378 PR mergiate in 30 g)
Descrizione
When a controlplane has to send "Unready" k8s endpoints to Envoy, when Envoy runs in to panic mode, Envoy sends traffic to "Unready" endpoints. This breaks the Kubernetes contract that "Unready" endpoints should never receive traffic.
In Istio, we send "Unready" endpoints with "Unhealthy" status. So the panic threshold algorithm can not distinguish between "Unready" vs. "Unhealthy".
Please refer to https://github.com/istio/istio/issues/18367 for why we send "Unready" endpoints. This also needed for warmup duration (slow start mode) so that intermittent readiness failures (after the service is ready for the first time) does not cause spurious warmups.
The feature request is to add additional status for "UNREADY" endpoints, that load balancer can exclude while considering hosts during panic threshold scenarios.