App Autoscaler

In the App Autoscaler pane, you configure the App Autoscaler service. To use App Autoscaler, you must create an instance of the service and bind it to an app. To create an instance of App Autoscaler and bind it to an app, see Set up App Autoscaler in Scaling an App Using App Autoscaler.

To configure the App Autoscaler pane:

1. Select App Autoscaler.

2. For App Autoscaler instance count, enter the number of instances of the App Autoscaler service you want to deploy. The default value is 3. For high availability, set this number to 3 or higher. Larger environments might require more instances than the default number. VMware recommends one App Autoscaler instance for every 10 apps using App Autoscaler.

3. For App Autoscaler API instance count, enter the number of instances of the App Autoscaler API you want to deploy. The default value is 1. Larger environments might require more instances than the default number.

4. For Metric collection interval, enter how many seconds of data collection you want App Autoscaler to evaluate when making scaling decisions. The minimum interval is 60 seconds, and the maximum interval is 3600 seconds. The default value is 120. Increase this number if the metrics you use in your scaling rules are emitted less frequently than the existing metric collection interval.

5. For Scaling interval, enter in seconds how frequently App Autoscaler evaluates an app for scaling. The minimum interval is 15 seconds, and the maximum interval is 120 seconds. The default value is 35.

6. To configure verbose logging for App Autoscaler, select the Allow verbose logging check box. Verbose logging is disallowed by default. Selecting the Allow verbose logging check box allows you to see more detailed logs. Verbose logs show specific reasons why App Autoscaler scaled the app, including information about instance limits and the status of App Autoscaler. For more information about App Autoscaler logs, see Manage App Autoscaler Notifications in Scaling an App Using App Autoscaler.

7. If you do not want the Autoscaler API to reuse HTTP connections, select the Disallow API connection pooling check box. This might be necessary if your front end idle timeout for the Gorouter is set to a low value, such as 1. For more information, see Configuring front end idle timeout for Gorouter.

8. To allow App Autoscaler to email event notifications to space developers, select the Send email notifications check box. For more information about managing email notifications, see Manage App Autoscaler notifications in Scaling an App Using App Autoscaler.

9. Click Save.