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

November 2021

Feature Description Release date Region References
Support for asynchronous interaction Auto Scaling allows you to manually moves an Elastic Compute Service (ECS) instance into or out of the Standby state in an asynchronous manner, which improves user experience. 2021-11-29 All
Support for evaluation on ECS instance availability Auto Scaling provides the scaling strength feature. You can use this feature to evaluate the availability of ECS instances, which helps improve the success rate of scale-out activities. 2021-11-28 All Evaluate resource availability based on scalability
Support for automatic processing of abnormal scaling groups If your scaling group is abnormal, the Auto Scaling console prompts you with an error message to help you identify and troubleshoot issues at the earliest opportunity. 2021-11-16 All View scaling groups
Support for the configuration of capacity reservation When you create or modify a scaling configuration, you can configure the Capacity Reservation parameter for ECS instances or elastic container instances. 2021-11-02 All

October 2021

Feature Description Release date Region References
Support for elastic container instances Auto Scaling can scale elastic container instances in a scaling group. 2021-10-20 All

September 2021

Feature Description Release date Region References
Intelligent configuration Intelligent configuration is supported in scaling configurations. In the Intelligent Configuration mode, Auto Scaling filters instance types that meet your configuration requirements for scale-out activities. 2021-09-09 All

August 2021

Feature Description Release date Region References
Economical mode The feature name is changed from No Fees for Stopped Instances (VPC-Connected) to economical mode. 2021-08-09 All

June 2021

Feature Description Release date Region References
Association with ALB server groups Application Load Balancer (ALB) server groups can be associated with scaling groups. After you associate an ALB server group with a scaling group, 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 Region References
Vertical scaling The specifications of pay-as-you-go instances can be changed. The specifications include vCPUs and memory size. 2021-03-31 All Overview

February 2021

Feature Description Release date Region References
Scaling configuration Weights can be specified for instance types. 2021-02-12 All

January 2021

Feature Description Release date Region References
Scaling configuration Sequential and unique hostnames can be automatically generated. 2021-01-15 All

November 2020

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

October 2020

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

September 2020

Feature Description Release date Region References
Modification of scaling configurations The images that are 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 Region 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 instances from the scaling group. 2020-08-12 All Expected number of instances
Scheduled task The expiration time can be skipped. The maximum recurrence period can be up to one year. 2020-08-07 All Create a scheduled task

July 2020

Feature Description Release date Region References
Modification of scaling groups Health check can be enabled or disabled for 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 multiple images in scaling configurations at the same time. 2020-07-02 All Replace images in multiple scaling configurations at a time

May 2020

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

April 2020

Feature Description Release date Region 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 Region References
Event-triggered task for system monitoring More metrics are supported by system monitoring event-triggered tasks. 2020-03-17 All Event-triggered task for system monitoring
Optimized configuration items for scaling groups The classification of the configuration items that are used to create a scaling group is 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 Release date Region References
Support for suspending and resuming processes in scaling groups The processes for a scaling group can be suspended or resumed to control scaling operations in a fine-grained manner. 2019-12-03 All

October 2019

Feature Description Release date Region References
Configuration of the health status of ECS instances An API operation can be called to configure the health status of an ECS instance. 2019-10-25 All SetInstanceHealth
Expected number of instances The expected number of ECS instances in a scaling group can be configured. This way, Auto Scaling can execute scaling activities in parallel. 2019-10-22 All Expected number of instances

September 2019

Feature Description Release date Region References
Creation of a scaling configuration from an existing instance API operations can be called to create a scaling group and instance IDs can be specified. 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 Region References
Association of 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 Region References
Support for mixed instance allocation in the cost optimization policy If you set the multi-zone scaling policy to cost optimization, pay-as-you-go instances and preemptible instances can be created based on the capacity that you specify. 2019-07-02 All Create a scaling group

May 2019

Feature Description Release date Region References
Step scaling rule A step scaling rule can be created to control scaling activities based on the size of the alert breach. 2019-05-20 All Create a scaling rule
Support for multiple security groups An instance that is automatically created can be added to multiple security groups. 2019-05-15 All Create a scaling configuration (ECS)
Query of the endpoint information An API operation can be called to query the regions that support Auto Scaling. 2019-05-05 All DescribeRegions

April 2019

Feature Description Release date Region References
Predictive scaling rule Predictive scaling rules can be created. After you create a predictive scaling rule, 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 in scaling configurations can be configured. 2019-04-04 All Create a scaling configuration (ECS)

January 2019

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

December 2018

Feature Description Release date Region References
Change of vSwitches The vSwitches that are associated with a scaling group can be changed. 2018-12-28 All Modify a scaling group
Cost optimization policy The multi-zone scaling policy can be set to cost optimization. 2018-12-16 All
vServer group vServer groups can be specified for SLB instances that are associated with a scaling group. 2018-12-07 All Use CLB in Auto Scaling

November 2018

Feature Description Release date Region 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 Region References
Enhanced whitelist of ApsaraDB RDS instances The private 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 Region References
New 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 Region References
Cron expression Cron expressions can be used to specify the recurrence period of scheduled tasks. 2018-08-20 All Create a scheduled task
Expiration notification for scheduled tasks Expiration notifications for scheduled tasks can be configured. 2018-08-20 All Create an event notification

July 2018

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

April 2018

Feature Description Release date Region References
Scaling activity notifications When a specific type of scaling activity 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 Region 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 way, you can manage the lifecycle of the ECS instances. 2018-03-15 All Put an ECS instance into the Standby state

2015

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

2014

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