I was trying to get an image from my CloudWatch Dashboard of a Gauge widget that I created.

I am successfully able to download the image, but the image looks more like a line graph than a gauge. Why is that?

% aws cloudwatch get-metric-widget-image --metric-widget file://cpu_gauge.json | grep MetricWidgetImage | awk '{split($0,a,"\""); print a[4]}' | base64 --decode > cpu_gauge.png

# cpu_gauge.json

{
   "view":"gauge",
   "metrics":[
      [
         "AWS/EC2",
         "CPUUtilization",
         "InstanceId",
         "i-000000000000000",
         {
            "region":"ap-northeast-1"
         }
      ],
      [
         "...",
         "i-111111111111111",
         {
            "region":"ap-northeast-1"
         }
      ]
   ],
   "region":"ap-northeast-1",
   "yAxis":{
      "left":{
         "min":0,
         "max":100
      }
   },
   "period":300,
   "title":"CPU (Gauge)"
}

cpu_gauge.png:

This is the image that I expected to see, and is how I see it on the CloudWatch Dashboard

Likewise, when I used AWS ChatBot to send the image to slack, it sent the same non-gauge result.