Queries unhealthy instances.


OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different SDKs.

Request parameters

Parameter Type Required Example Description
Action String Yes DescribeUnhealthyHostAvailability

The operation that you want to perform. Set the value to DescribeUnhealthyHostAvailability.

Id.N RepeatList Yes 123456

The ID of the availability monitoring task. Valid values of N: 1 to 20.

Response parameters

Parameter Type Example Description
Code String 200

The HTTP status code.

Note The status code 200 indicates that the call was successful.
Message String User not authorized to operate on the specified resource.

The returned message.

RequestId String ACBDBB40-DFB6-4F4C-8957-51FFB233969C

The ID of the request.

Success Boolean true

Indicates whether the call was successful. Valid values:

  • true: The call was successful.
  • false: The call failed.
UnhealthyList Array of NodeTaskInstance N/A

The unhealthy instances that are detected by the specified availability monitoring tasks.

NodeTaskInstance N/A N/A N/A
Id Long 123456

The ID of the availability monitoring task.

InstanceList List i-a34b581****

The unhealthy instances that are detected by the availability monitoring task.


Sample requests

&<Common request parameters>

Sample success responses

XML format


JSON format

    "RequestId": "8C2F25CB-F9E7-4693-95C7-A095417B2948",
    "Code": 200,
    "Success": true,
    "UnhealthyList": {
        "NodeTaskInstance": [
                "Id": 123456,
                "InstanceList": {
                    "String": ["i-a34b581****"]

Error codes

For a list of error codes, visit the API Error Center.