# Application Auto Scaling events
Application Auto Scaling

Application Auto Scaling sends service events directly to EventBridge.

## Application Auto Scaling service events
Service events

Application Auto Scaling sends the following events directly to EventBridge: 
+ Application Auto Scaling Scaling Activity State Change

*Delivery type*: [ Best effort ](event-delivery-level.md) 

To match against all events from this service, create an event pattern that matches against the following event attribute:
+ `source`: aws.application-autoscaling

```
{
  "source": ["aws.application-autoscaling"]
}
```

To match against specific events, include a `detail-type` attribute specifying an array of event names to match. For example:

```
{
  "source": ["aws.application-autoscaling"],
  "detail-type": ["Application Auto Scaling Scaling Activity State Change"]
}
```

For more information, see [Creating event patterns](https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-event-patterns.html#eb-create-pattern) in the *Amazon EventBridge User Guide*.