Scale errors on simple CloudWatch Dashboard

Question

I have a very simple CloudWatch Dashboard
Just show CPU and Memory usage of my ECS service.

![CloudWatch Dashboard](https://fotos.subefotos.com/44ea6093123cefe538006888e5cdaeb8o.png)

The CPU value in the tooltip is ok, but the scale is wrong
The scale must be between 0 an 100, but is showing a weird 129 for a CPU value of 99,3

Any idea about how solve this issue? looks like a AWS error.

Accepted Answer

Looks like you've used the "[stacked=true](https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/CloudWatch-Dashboard-Body-Structure.html#CloudWatch-Dashboard-Properties-Metric-Widget-Object)" setting for a Metric Widget, hence you are plotting all metrics on the graph in a "stacked area" visualization.  Only use this for metrics that add up logically.

In your case CPU is being added to the Memory below it, giving the 120 value.  Remove the [stacked](https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/CloudWatch-Dashboard-Body-Structure.html#CloudWatch-Dashboard-Properties-Metric-Widget-Object) setting, or set it to false (default). Also consider moving the Memory metric to the right Y-axis so the scale of each metric does not "drown out" the detail of the other.

Answer

Actually, CPUUtilization of ECS service can go over 100%. It's because this metric is not for CPU utilization of host machine, but rather for CPU utilization of CPU units allocated to your tasks. There are more details in [AWS doc](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/cloudwatch-metrics.html#service_utilization).
Though for the chart itself - indeed there seems to be an issue somewhere as those figures do not match, but it's not that obvious which one is wrong.

Scale errors on simple CloudWatch Dashboard

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