KEDA
Event-driven autoscaling & scale-to-zero: ScaledObject, scalers, the http-add-on, KEDA vs HPA vs Knative
Kubernetes' built-in Horizontal Pod Autoscaler (HPA) only scales on CPU/memory and cannot go below 1 replica — so it can neither react to event sources (queue depth, HTTP backlog) nor ever scale to zero. KEDA (Kubernetes Event-Driven…