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Hi, when you browse your AWS/EC2 metrics, you can see that there are different schemas: by autoscaling group, by AMI, per-instance metrics… It sounds to me like you might have selected the wrong schema. Each schema has a different set of dimensions, you can apply the WHERE filter and GROUP BY aggregation clauses only on the dimensions available in that schema. If you try to GROUP BY instance id metrics from the "by autoscaling group" schema, you won't get distinct metrics because the metrics in the "by autoscaling group" schema don't have the instance id dimension, they are already pre-aggregated. If you want to see a graph for all the instances, you need to select the "per-instance metrics" schema - however you will then not be able to display only one specific autoscaling group, as the autoscaling group is not published as a dimension for those metrics.
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