Adding Percentage Unit to AWS CloudWatch Gauge Display

Question

Good afternoon, Dear,

I'm encountering an issue with AWS CloudWatch. I've created a dashboard that exposes the Freeablememory metric of an RDS in a gauge. However, I wasn't satisfied with just the free memory; I would like to display the percentage of memory occupied. So, I processed the data as follows:

m1 freeablememory
e2 8e+9 (total RAM in bytes in scientific notation) + m1
e3 (m1/e2) * 100 (to obtain the percentage)

Indeed, it returned the value in percentage but does not display the unit %. How can I add it?

Looking forward to your response.

Thank you.

Accepted Answer

Hi Paulo 
In the program language  you need to  modifying the dashboard, you can use the setWidgetMetricFormat API call.In the JSON used to define the widget, specify the format of the metric to include the "%" symbol.

"metrics": [
    [ "AWS/RDS", "FreeableMemory", "DBInstanceIdentifier", "your-instance", { "id": "m1" } ],
    [ { "expression": "m1 / 8e+9 * 100", "label": "Memory Used (%)", "id": "e1", "unit": "Percent" } ]
],

Adding Percentage Unit to AWS CloudWatch Gauge Display

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