Knative: Serving scales workloads, Eventing routes events

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Knative architecture: HTTP clients enter through the Kourier gateway, which routes to the activator when a service is at zero or to a workload pod with a queue-proxy sidecar; the autoscaler receives demand from the activator and metrics from the pods and scales the Deployment. Below, a KafkaSource feeds a Kafka-backed broker, a trigger filters events and posts them to a Knative Service, and failed deliveries go to a dead letter sink.