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Showing content from https://docs.aws.amazon.com/AmazonSynthetics/latest/APIReference/API_DescribeCanaries.html below:

DescribeCanaries - Amazon CloudWatch Synthetics

DescribeCanaries

This operation returns a list of the canaries in your account, along with full details about each canary.

This operation supports resource-level authorization using an IAM policy and the Names parameter. If you specify the Names parameter, the operation is successful only if you have authorization to view all the canaries that you specify in your request. If you do not have permission to view any of the canaries, the request fails with a 403 response.

You are required to use the Names parameter if you are logged on to a user or role that has an IAM policy that restricts which canaries that you are allowed to view. For more information, see Limiting a user to viewing specific canaries.

Request Syntax

POST /canaries HTTP/1.1
Content-type: application/json

{
   "MaxResults": number,
   "Names": [ "string" ],
   "NextToken": "string"
}

URI Request Parameters

The request does not use any URI parameters.

Request Body

The request accepts the following data in JSON format.

MaxResults

Specify this parameter to limit how many canaries are returned each time you use the DescribeCanaries operation. If you omit this parameter, the default of 20 is used.

Type: Integer

Valid Range: Minimum value of 1. Maximum value of 20.

Required: No

Names

Use this parameter to return only canaries that match the names that you specify here. You can specify as many as five canary names.

If you specify this parameter, the operation is successful only if you have authorization to view all the canaries that you specify in your request. If you do not have permission to view any of the canaries, the request fails with a 403 response.

You are required to use this parameter if you are logged on to a user or role that has an IAM policy that restricts which canaries that you are allowed to view. For more information, see Limiting a user to viewing specific canaries.

Type: Array of strings

Array Members: Minimum number of 1 item. Maximum number of 5 items.

Length Constraints: Minimum length of 1. Maximum length of 255.

Pattern: ^[0-9a-z_\-]+$

Required: No

NextToken

A token that indicates that there is more data available. You can use this token in a subsequent operation to retrieve the next set of results.

Type: String

Length Constraints: Minimum length of 4. Maximum length of 252.

Required: No

Response Syntax

HTTP/1.1 200
Content-type: application/json

{
   "Canaries": [ 
      { 
         "ArtifactConfig": { 
            "S3Encryption": { 
               "EncryptionMode": "string",
               "KmsKeyArn": "string"
            }
         },
         "ArtifactS3Location": "string",
         "Code": { 
            "Dependencies": [ 
               { 
                  "Reference": "string",
                  "Type": "string"
               }
            ],
            "Handler": "string",
            "SourceLocationArn": "string"
         },
         "DryRunConfig": { 
            "DryRunId": "string",
            "LastDryRunExecutionStatus": "string"
         },
         "EngineArn": "string",
         "ExecutionRoleArn": "string",
         "FailureRetentionPeriodInDays": number,
         "Id": "string",
         "Name": "string",
         "ProvisionedResourceCleanup": "string",
         "RunConfig": { 
            "ActiveTracing": boolean,
            "EphemeralStorage": number,
            "MemoryInMB": number,
            "TimeoutInSeconds": number
         },
         "RuntimeVersion": "string",
         "Schedule": { 
            "DurationInSeconds": number,
            "Expression": "string",
            "RetryConfig": { 
               "MaxRetries": number
            }
         },
         "Status": { 
            "State": "string",
            "StateReason": "string",
            "StateReasonCode": "string"
         },
         "SuccessRetentionPeriodInDays": number,
         "Tags": { 
            "string" : "string" 
         },
         "Timeline": { 
            "Created": number,
            "LastModified": number,
            "LastStarted": number,
            "LastStopped": number
         },
         "VisualReference": { 
            "BaseCanaryRunId": "string",
            "BaseScreenshots": [ 
               { 
                  "IgnoreCoordinates": [ "string" ],
                  "ScreenshotName": "string"
               }
            ]
         },
         "VpcConfig": { 
            "Ipv6AllowedForDualStack": boolean,
            "SecurityGroupIds": [ "string" ],
            "SubnetIds": [ "string" ],
            "VpcId": "string"
         }
      }
   ],
   "NextToken": "string"
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

Canaries

Returns an array. Each item in the array contains the full information about one canary.

Type: Array of Canary objects

NextToken

A token that indicates that there is more data available. You can use this token in a subsequent DescribeCanaries operation to retrieve the next set of results.

Type: String

Length Constraints: Minimum length of 4. Maximum length of 252.

Errors

For information about the errors that are common to all actions, see Common Errors.

InternalServerException

An unknown internal error occurred.

HTTP Status Code: 500

ValidationException

A parameter could not be validated.

HTTP Status Code: 400