If the total ingress throughput or the total ingress event rate across all event hubs in a namespace exceeds the aggregate throughput unit allowances, senders are throttled and receive errors indicating that the ingress quota has been exceeded.
If the total egress throughput or the total event egress rate across all event hubs in a namespace exceeds the aggregate throughput unit allowances, receivers are throttled but no throttling errors are generated.
Ingress and egress quotas are enforced separately, so that no sender can cause event consumption to slow down, nor can a receiver prevent events from being sent into an event hub.