Introducing enhanced custom event buses in Amazon EventBridge for enterprise-scale event-driven applications

Summary

• Organizations scaling event-driven applications across teams and accounts face operational complexity, visibility loss, and compounding costs with traditional multi-account EventBridge structures.
• AWS announces an enhanced custom event bus that allows a single, centralized event bus to be shared across all AWS accounts in an organization.
• The new bus provides ordering guarantees, a simplified Subscriber resource, and a new pricing model for improved economics and cost allocation.
• Users can enable event bus sharing within their organization via AWS Resource Access Manager without configuring cross-account permissions or bus-to-bus routing.
• Platform teams maintain visibility into all event flows while application teams publish and subscribe independently without infrastructure provisioning delays.
• The enhanced bus has a default quota of 10,000 Subscribers per bus to reduce fragmentation caused by subscriber limits.
• Publishers can include an EventGroupId to ensure events are delivered in sequence to subscribers choosing ordered delivery while others receive events asynchronously.
• Synchronous invocation for targets like AWS Lambda confirms successful processing before acknowledging events, eliminating the need for Amazon SQS intermediaries.
• The new Subscriber resource combines event filtering, target configuration, retry policies, and dead-letter destinations into a single manageable unit.
• Subscribers support variable start time options to facilitate onboarding new consumers or replaying events for recovery.
• Publishers can enable content-based deduplication to detect and drop retries within five minutes, providing exactly-once delivery semantics.
• Subscribers can use JSONata expressions to reshape events or deserialize Apache Avro and Protocol Buffers payloads to JSON for fine-grained filtering.
• The new pricing model charges publishers for ingested events and subscribers for delivered events, replacing the per-event model that compounded routing charges.
• Existing custom event buses continue to function as "Custom event bus – classic" with no changes required.
• The enhanced custom event bus is available in US East, US West, Europe, and Asia Pacific regions via the AWS Management Console, AWS CLI, or EventBridge APIs.