You can check whether the prediction based on a predictive scaling rule meets your expectations.

Procedure

  1. Log on to the Auto Scaling console.
  2. In the left-side navigation pane, click Scaling Groups.
  3. In the top navigation bar, select a region.
  4. Find the target scaling group and use one of the following methods to open the details page of the scaling group:
    • Click the ID of the scaling group in the Scaling Group Name/ID column.
    • Click Manage in the Actions column.
  5. In the left-side navigation pane, click Scaling Rules.
  6. Find the target predictive scaling rule and click View Details in the Actions column.

    The Rule Details page shows multiple metrics to help you evaluate the prediction. You can enable Forecast and Scale after confirming that the prediction meets your expectations. For more information, see Modify a scaling rule.

    • Compare the actual and predicted CPU usage to evaluate the prediction accuracy.
    • Compare the actual and predicted numbers of Elastic Compute Service (ECS) instances to evaluate the prediction accuracy.
    • Check whether the scheduled plans generated from the prediction meet your expectations.

What to do next

If Forecast and Scale is enabled, Auto Scaling automatically creates scheduled tasks for the predictive scaling rule based on the scheduled plans generated from the prediction. You can view the details of the scheduled tasks on the Scheduled Tasks page. These tasks are named in the following format: PredictiveScaling-Scaling rule name-Execution time.
These scheduled tasks change the maximum and minimum numbers of the scaling group and are deleted after they are executed. You can view the details of the scaling activities triggered by these scheduled tasks on the Scaling Activities page.