GetMetricWidgetImage not able to retrieve image

Hi There

If you don't use one of the AWS SDKs, you can make CloudWatch API requests over HTTP using the POST request method. The POST method requires you to specify the operation in the header of the request and provide the data for the operation in JSON format in the body of the request. See https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/making-api-requests.html#CloudWatch-API-requests-using-post-method

You will need to construct the MetricWidget parameter in json format and pass it with your POST request. See https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_GetMetricWidgetImage.html

@Matt-B

Below is the request I am using (redacted credentials) , able to see error message ( {"__type":"com.amazon.coral.service#UnknownOperationException"} ) when request is sent. Can you help to resolve this.

curl --location --request POST 'http://monitoring.us-east-1.amazonaws.com'
--header 'x-amz-target: GraniteServiceVersion20100801.MetricWidget'
--header 'Content-Encoding: amz-1.0'
--header 'X-Amz-Content-Sha256: beaead3198f7da1e70d03ab969765e0821b24fc913697e929e726aeaebf0eba3'
--header 'X-Amz-Date: 20230104T054615Z'
--header 'Authorization: AWS4-HMAC-SHA256 Credential=<redacted>/20230104/us-east-1/execute-api/aws4_request, SignedHeaders=content-encoding;host;x-amz-content-sha256;x-amz-date;x-amz-target, Signature=6d1c80d2b6c38895ee28dacae25d756387d2e37595d67a0ae5b5b08e34c679a8'
--header 'Content-Type: application/json'
--data-raw '{ "OutputFormat":"png", "MetricWidget":{ "width":600, "height":395, "metrics": [ [ "AWS/EC2", "CPUUtilization", "AutoScalingGroupName", "LoadTest-Clister-A", { "visible": false } ], [ "AWS/EC2", "CPUUtilization", "InstanceId", "i-0fff55f4e57f7289d" ], [ "AWS/EC2", "CPUUtilization", "InstanceId", "i-0c9c05fa7dc1a28f2" ], [ "AWS/EC2", "CPUUtilization", "InstanceId", "i-0349c01a4508abd6e" ], [ "AWS/EC2", "CPUUtilization", "InstanceId", "i-0d2eea8bd67634a75" ], [ "AWS/EC2", "CPUUtilization", "AutoScalingGroupName", "LoadTest-ML" ], [ "AWS/EC2", "CPUUtilization", "AutoScalingGroupName", "Loadtest-Monitoring" ], [ "AWS/EC2", "CPUUtilization", "AutoScalingGroupName", "platform-loadtest-clustera" ] ], "view": "timeSeries", "stacked": false, "region": "us-east-1", "title": "CPU Utilization", "stat": "Maximum", "period":300, "start":"-P30D", "end":"PT0H", "yAxis":{ "left":{ "min":0.1, "max":1 }, "right":{ "min":0 } }, "annotations":{ "horizontal":[ { "color":"#ff6961", "label":"Trouble threshold start", "fill":"above", "value":0.5 } ], "vertical":[ { "visible":true, "color":"#9467bd", "label":"Bug fix deployed", "value":"2018-08-28T15:25:26Z", "fill":"after" } ] } } } '