Monitor interruptible Capacity Reservations with EventBridge and CloudTrail

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

EventBridge notifications

You receive two types of EventBridge notifications. For information about how to set up EventBridge notifications, see Creating Amazon EventBridge rules.

Instance interruption warning

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 Interruptible 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

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 Capacity Reservation Interruptible Reclamation Complete",
    "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

CloudTrail logs these events for interruptible Capacity Reservations: