This topic describes the release notes for Auto Scaling and provides links to the relevant references.

August 2021

Feature Description Release date Regions References
Economical mode No Fees for Stopped Instanced is renamed to Economical Mode. 2021-08-09 All

June 2021

Feature Description Release date Regions References
Association with ALB server groups Application Load Balancer (ALB) server groups can be associated with scaling groups. After an ALB server group is associated with a scaling group, Elastic Compute Server (ECS) instances that are added to the scaling group are automatically added to the ALB server group as backend servers. ALB instances distribute requests to the ALB server groups. 2021-06-11 All

March 2021

Feature Description Release date Regions References
Vertical scaling Specifications (vCPUs and memory) of pay-as-you-go instances can be changed. 2021-03-31 All Overview

February 2021

Feature Description Release date Regions References
Scaling configurations Weights can be set for instances of different specifications. 2021-02-12 All

January 2021

Feature Description Release date Regions References
Scaling configurations Auto Scaling can automatically generate sequential and unique hostnames. 2021-01-15 All

November 2020

Feature Description Release date Regions References
Scaling configurations The performance levels of system disks or data disks of the enhanced SSD (ESSD) type can be specified. 2020-11-18 All

October 2020

Feature Description Release date Regions References
Event-triggered tasks The statistical methods supported by custom monitoring event-triggered tasks are added. 2020-10-25 All

September 2020

Feature Description Release date Regions References
Modification of scaling configurations The images specified in scaling configurations can be modified. 2020-09-24 All Replace the image in a single scaling configuration

August 2020

Feature Description Release date Regions References
Rolling update Operation Orchestration Service (OOS) packages can be used to install software. 2020-08-20 Some Rolling update
Expected number of instances The expected number of instances in a scaling group can be modified when you delete or remove ECS instances from the scaling group. 2020-08-12 All Expected number of instances
Scheduled tasks The expiration time can be skipped. The maximum recurrence period can be changed to one year. 2020-08-07 All Create a scheduled task

July 2020

Feature Description Release date Regions References
Modification of scaling groups Health check can be enabled or disabled for ECS instances in an existing scaling group. 2020-07-30 All Modify a scaling group
Image update in scaling configurations Update tasks can be created to update images in scaling configurations at a time. 2020-07-02 All Replace images in multiple scaling configurations at a time

May 2020

Feature Description Release date Regions References
Auto Scaling-linked role The AliyunServiceRoleForAutoScaling role is automatically created for Auto Scaling when the Auto Scaling service is activated. 2020-05-06 All Manage the Auto Scaling service linked role

April 2020

Feature Description Release date Regions References
Rolling update Rolling update tasks can be created to update the configurations of ECS instances in batches. 2020-04-26 Some Rolling update

March 2020

Feature Description Release date Regions References
System monitoring event-triggered tasks More monitoring metrics are supported by system monitoring event-triggered tasks. 2020-03-17 All Event-triggered tasks for system monitoring
Optimization for creating scaling groups Configuration items for creating a scaling group are optimized. You can add tags to scaling groups and select existing instances as templates to create instances for the scaling groups. 2020-03-11 All Create a scaling group

December 2019

Feature Description Date Regions References
Suspend and resume processes of scaling groups Processes for a scaling group can be suspended or resumed to implement fine-grained control of scaling operations. 2019-12-03 All

October 2019

Feature Description Release date Regions References
Support for ECS instance health status An API operation can be called to set the health status of an ECS instance. 2019-10-25 All SetInstanceHealth
Expected number of ECS instances The expected number of ECS instances in a scaling group can be set. This allows Auto Scaling to execute scaling activities in parallel. 2019-10-22 All Expected number of instances

September 2019

Feature Description Release date Regions References
Support for creating a scaling configuration from an existing instance API operations can be called to create a scaling group, and instances can be specified as the configuration sources. Auto Scaling can obtain the configuration information of an instance and automatically create a scaling configuration. 2019-09-24 All CreateScalingGroup

August 2019

Feature Description Release date Regions References
Support for associating a lifecycle hook with an OOS template A lifecycle hook can be associated with an OOS template. When the lifecycle hook is triggered, Auto Scaling automatically uses the associated OOS template. 2019-08-14 All Create a lifecycle hook

July 2019

Feature Description Release date Regions References
Support for mixed instance allocation in the cost optimization policy Pay-as-you-go instances and preemptible instances can be created based on the specified capacity when you set the multi-zone scaling policy to cost optimization policy. 2019-07-02 All Create a scaling group

May 2019

Feature Description Release date Regions References
Step scaling rules A step scaling rule can be created to implement fine-grained scaling control based on the size of the alert breach. 2019-05-20 All Create a scaling rule
Multiple security groups An automatically created instance can be added to multiple security groups. 2019-05-15 All Create a scaling configuration
Query of the endpoint information An API operation can be called to query regions that support Auto Scaling. 2019-05-05 All DescribeRegions

April 2019

Feature Description Release date Regions References
Predictive scaling rules Predictive scaling rules can be created. After a predictive scaling rule is created, Auto Scaling adjusts the minimum and maximum numbers of instances in a scaling group based on historical monitoring data. 2019-04-18 All Overview
Support for the DiskName, DiskDescription, and Encrypted parameters in scaling configurations The disk name, disk description, and encryption can be set in scaling configurations. 2019-04-04 All Create a scaling configuration

January 2019

Feature Description Release date Regions References
Target tracking scaling rules Target tracking scaling rules can be created. After a target tracking scaling rule is created, Auto Scaling adjusts the number of ECS instances based on the specified target values. 2019-01-11 All Create a scaling rule

December 2018

Feature Description Release date Regions References
vSwitches can be changed. The vSwitches associated with a scaling group can be changed. 2018-12-28 All Modify a scaling group
Cost optimization policy The cost optimization policy is available for the multi-zone scaling policy. 2018-12-16 All
vServer groups vServer groups can be specified for SLB instances associated with a scaling group. 2018-12-07 All Use CLB in Auto Scaling

November 2018

Feature Description Release date Regions References
Support for the No Fees for Stopped Instances (VPC-Connected) state ECS instances that are removed from a scaling group can enter the No Fees for Stopped Instances (VPC-Connected) state. 2018-11-28 All

October 2018

Feature Description Release date Regions References
Enhanced whitelist of the ApsaraDB RDS instances The internal IP addresses of ECS instances in a scaling group can be added to the enhanced whitelist of the ApsaraDB RDS instances that are associated with the scaling group. 2018-10-19 All Create a scaling group

September 2018

Feature Description Release date Regions References
Release of Auto Scaling in the UK (London) region Auto Scaling is available in the UK (London) region. 2018-09-30 All What is Auto Scaling?
Shutdown and reclaim mode The shutdown and reclaim mode can be specified for a scaling group. 2018-09-13 All Create a scaling group
Launch template A launch template can be specified as an instance configuration source for a scaling group. 2018-09-01 All Create a scaling group

August 2018

Feature Description Release date Regions References
Cron expressions for scheduled tasks Cron expressions can be used to specify the recurrence period of scheduled tasks. 2018-08-20 All Create a scheduled task
Expiration notifications for scheduled tasks Expiration notifications can be configured for scheduled tasks. 2018-08-20 All Create an event notification

July 2018

Feature Description Release date Regions References
Modification of information about data disks and preemptible instances Information about data disks and the price limits of preemptible instances in scaling configurations can be modified. 2018-07-27 All Modify a scaling configuration
Association with ApsaraDB RDS instances ApsaraDB RDS instances can be associated with or disassociated from scaling groups. 2018-07-11 All Modify a scaling group
Association with SLB instances SLB instances can be associated with or disassociated from scaling groups. 2018-07-04 All Modify a scaling group

June 2018

Feature Description Release date Regions References
Modification of scaling configurations Existing scaling configurations can be modified. 2018-06-27 All Modify a scaling configuration
Lifecycle hooks When an ECS instance is automatically created or removed from a scaling group, lifecycle hooks can be used to put the instance into the wait state. This allows you to perform operations on the instance. 2018-06-01 All Create a lifecycle hook

April 2018

Feature Description Release date Regions References
Scaling activity notifications When a scaling activity of a specific type occurs in a scaling group, notifications can be sent to CloudMonitor or Message Service. 2018-04-20 All Event notification overview

March 2018

Feature Description Release date Regions References
Protected state ECS instances in a scaling group can be put into the protected state. Instances in the protected state are not released or removed from the scaling group during scale-in activities. 2018-03-28 All Put an ECS instance into the Protected state
Standby state ECS instances in a scaling group can be put into the standby state. This allows you to manage the lifecycle of the ECS instances. 2018-03-15 All Put an ECS instance into the Standby state

2015

Service Description Release date Regions References
Auto Scaling Auto Scaling is officially launched. 2015-08-27 Some What is Auto Scaling?

2014

Service Description Release date Regions References
Auto Scaling Auto Scaling is in internal preview. 2014-10-15 Some What is Auto Scaling?