After you enable monitoring for a scaling group, use the Monitoring tab to track how instance counts change over time and how instances are distributed across zones. This helps you assess resource utilization over a specific period.
Prerequisites
Before you begin, make sure that you have:
Monitoring enabled for the scaling group
View instance count and distribution
-
Log on to the Auto Scaling console.
Log on to the Auto Scaling console.
In the left-side navigation pane, click Scaling Groups.
In the top navigation bar, select the region where Auto Scaling is activated.
Open the scaling group details page using one of the following methods:
Click the ID of the scaling group in the Scaling Group Name/ID column.
Click Details in the Actions column.
Click the Monitoring tab.
Set the time range for monitoring data.
Option Description Manual refresh Select a preset period: 1 Hour, 6 Hours, 12 Hours, 1 Day, or 1 Week. To use a custom range, specify a period within a month. Auto Refresh Turn on Auto Refresh to update monitoring data every five seconds. 
In the Resource Overview section, go to Instances in Scaling Group to view instance count changes over the selected period. The following figure shows instance count changes within one hour.
Go to Resource Overview > Instances in Different Zones to view how instances are distributed across zones. The following figure shows instance distribution in Hangzhou Zone I.
The steps above use ECS instances as an example. The same procedure applies when viewing elastic container instances.