# Monitor interruptible Capacity Reservations with EventBridge and CloudTrail
<a name="monitor-interruptible-cr"></a>

Interruptible Capacity Reservations send EventBridge notifications and CloudTrail events to help you monitor and respond to capacity changes.

**Topics**
+ [EventBridge notifications](#eventbridge-notifications)
+ [CloudTrail events](#cloudtrail-events)

## EventBridge notifications
<a name="eventbridge-notifications"></a>

You receive two types of EventBridge notifications. For information about how to set up EventBridge notifications, see [Creating Amazon EventBridge rules](https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-create-rule.html).

### Instance interruption warning
<a name="instance-interruption-warning"></a>

If you're running instances in an interruptible reservation, you receive this notification 2 minutes before your instances are terminated:

```
{
    "version": "0",
    "id": "{{12345678-1234-1234-1234-123456789012}}",
    "detail-type": "EC2 Capacity Reservation Instance Interruption Warning",
    "source": "aws.ec2",
    "account": "[{{instance owner Account ID}}]",
    "time": "[{{Current time in yyyy-mm-ddThh:mm:ssZ}}]",
    "resources": "[{{instance arn}}]",
    "region": "[{{region}}]",
    "detail": {
        "instance-id": "[{{instance-id}}]",
        "instance-action": "{{terminate}}",
        "instance-termination-time": "{{yyyy-mm-ddThh:mm:ssZ}}",
        "azId": "[{{availability-zone-id}}]"
    }
}
```

### Reclamation completion
<a name="reclamation-completion"></a>

If you own the source reservation, you receive this notification when capacity reclamation finishes:

```
{
    "version": "0",
    "id": "{{12345678-1234-1234-1234-123456789012}}",
    "detail-type": "EC2 Interruptible Capacity Reservation Allocation Reclamation Completed",
    "source": "aws.ec2",
    "account": "[{{source Capacity Reservation Owner Account ID}}]",
    "time": "[{{Current time in yyyy-mm-ddThh:mm:ssZ}}]",
    "region": "{{us-east-1}}",
    "resources": ["{{source_cr_arn}}"],
    "detail": {
        "sourceCapacityReservationId": "string",
        "instanceType": "string",
        "availabilityZoneId": "string",
        "TotalInstanceCount": "{{current total count in the source}}",
        "ReclaimedInstanceCount": "{{count of instances added to the source}}",
        "targetInstanceCount": "{{number}}"
    }
}
```

## CloudTrail events
<a name="cloudtrail-events"></a>

CloudTrail logs these events for interruptible Capacity Reservations:
+ `InterruptibleCapacityReservationCreated` — When you create an interruptible allocation
+ `InterruptibleCapacityReservationAllocationUpdated` — When you modify the allocation
+ `InterruptibleCapacityReservationCancelled` — When you cancel the allocation
+ `CapacityReservationModified` — When we modify the source reservation for allocation
+ `InterruptibleCapacityReservationInstancesTerminated` — When we terminate instances during reclamation