# EventBusV2SystemMetadataProperty

Customer-controllable system metadata attached to each forwarded event.

- Source: Generated code
- Type last changed: v2.275.0 · 26 Oct 2026

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import { aws_eventsv2 as eventsv2 } from 'aws-cdk-lib';
const eventBusV2SystemMetadataProperty: eventsv2.CfnSubscriber.EventBusV2SystemMetadataProperty = {
  deduplicationId: 'deduplicationId',
  eventGroupId: 'eventGroupId',
};
```

## Properties

- `deduplicationId`: string — The deduplication ID for FIFO deduplication on the downstream event bus.

  Accepts a literal value or a JSONata expression.

- `eventGroupId`: string — The event group ID for FIFO ordering on the downstream event bus.

  Accepts a literal value or a JSONata expression.