Viewing Auto Scaling Policy Events

Function

This API is used to view the events (change history) of auto scaling policies for deployed services. Before calling this API, ensure that you have obtained a valid user project ID, service ID, and deployment ID. After the API is called, the policy event ID, event status, rule execution information, number of instances before and after scaling, number of preset target instances, and execution record time are returned. If the provided service ID is invalid, the parameter settings are incorrect, or the system resources are insufficient, an error message is displayed, prompting you to check the validity of the input data or contact technical support.

Debugging

You can debug this API through automatic authentication in API Explorer or use the SDK sample code generated by API Explorer.

Authorization Information

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions.

If you are using role/policy-based authorization, see Permissions Policies and Supported Actions for details on the required permissions.
If you are using identity policy-based authorization, the following identity policy-based permissions are required.

Action

Access Level

Resource Type (*: required)

Condition Key

Alias

Dependencies

modelarts:service:listHpaEvents

Read

service *

-

-

-

Action	Access Level	Resource Type (*: required)	Condition Key	Alias	Dependencies
modelarts:service:listHpaEvents	Read	service *	-	-	-

URI

GET /v2/{project_id}/services/{service_id}/deployments/{deployment_id}/hpa/events

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Definition Project ID. For details, see Obtaining a Project ID and Name. Constraints N/A Range Project ID. Default Value N/A
service_id	Yes	String	Definition: Service ID, which can be obtained from the response body during service creation or by querying the service list. The service_id field indicates the service ID. Constraints N/A Range Service ID. Default Value N/A
deployment_id	Yes	String	Definition Deployment ID, which you can obtain from the response body when adding the deployment or by obtaining service deployments. The deployment_id field indicates the deployment ID. Constraints N/A Range Deployment ID. Default Value N/A

**Table 2** Query Parameters
Parameter	Mandatory	Type	Description
limit	No	Integer	Definition Maximum number of records displayed on each page. Constraints N/A Range [1,500] Default Value 10.
offset	No	Integer	Definition Start page for pagination display. The value starts from 0. Constraints N/A Range N/A Default Value 0.
sort_key	No	String	Definition Sorting field. Separate multiple fields with commas (,). The value can be create_at or update_at. The default value is update_at. Constraints N/A Range lastProbeTime: sorting by execution record event. status: sorting by status. Default Value update_at
sort_dir	No	String	Definition Sort order. Constraints N/A Range ASC: ascending order DESC: descending order Default Value DESC

Request Parameters

**Table 3** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	Definition User token. It can be obtained by calling the IAM API used to obtain a user token. The value of X-Subject-Token in the response header is the user token. For details about how to obtain the token, see Obtaining a User Token Through Password Authentication. Constraints N/A Range N/A Default Value N/A
Content-Type	Yes	String	Definition Message body type or format. Constraints N/A Range application/json application/json;charset=utf-8 Default Value N/A

Response Parameters

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
current	Integer	Definition Current page number. Range N/A
pages	Integer	Definition Total number of pages. Range N/A
size	Integer	Definition Number of records on each page. Range N/A
total	Integer	Definition The total number of records. Range N/A
data	Array of HpaEventResponse objects	Definition Service event list.

**Table 5** HpaEventResponse
Parameter	Type	Description
id	String	Definition Auto scaling policy event ID. Range Event ID
hpa_id	String	Definition Auto scaling policy ID. Range Policy ID
status	String	Definition Auto scaling event status. Range SUCCESS FAILED
message	String	Definition Auto scaling rule execution information. Range N/A
current_replicas	Integer	Definition Number of instances before scaling. Range N/A
target_replicas	Integer	Definition Target instances. Range N/A
final_replicas	Integer	Definition Number of instances after scaling. Range N/A
record_time	String	Definition Execution record time. Range 2025-05-20 10:05:55

Status code: 400

**Table 6** Response body parameters
Parameter	Type	Description
error_code	String	Definition: ModelArts error code. Range: N/A.
error_msg	String	Definition: Error message. Range: N/A.

Status code: 404

**Table 7** Response body parameters
Parameter	Type	Description
error_code	String	Definition: ModelArts error code. Range: N/A.
error_msg	String	Definition: Error message. Range: N/A.

Example Requests

None

Example Responses

Status code: 200

View auto scaling policy events.

{
  "current" : 0,
  "data" : [ {
    "id" : "58865106-c6c6-427a-9e0b-1c9e3f5bac4f",
    "hpa_id" : "1d7812a3-0032-4f7a-bf31-87849ed41577",
    "status" : "SUCCESS",
    "message" : "scale target replicas success, current replicas:1, target replicas:2, final replicas:2",
    "current_replicas" : 1,
    "target_replicas" : 2,
    "final_replicas" : 2,
    "record_time" : "2025-05-20 01:11:14"
  }, {
    "id" : "85b6562d-df8b-4fec-a646-a6c8fe348185",
    "hpa_id" : "8e767bd5-ca5d-4e2f-af33-f944f15f1602",
    "status" : "SUCCESS",
    "message" : "skip scale target replicas, current replicas:2, target replicas:2, final replicas:2",
    "current_replicas" : 2,
    "target_replicas" : 2,
    "final_replicas" : 2,
    "record_time" : "2025-05-19 01:11:14"
  } ],
  "pages" : 1,
  "size" : 10,
  "total" : 2
}