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I just created an alarm where I choose "Across All Instances", CPUUtilization, Maximum >= 90. It created an alarm with an empty Dimension array. Getting metrics and status set to OK.
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Thank you. Perhaps I did something wrong. Will check.
Sorry, probably a dumb question, but where are you finding "Across All Instances"? I'm most likely looking in the wrong place (Console > CloudWatch > Alarms > Create Alarm > Browse > EC2).
Found it. Needs detailed monitoring enabling on the instances: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/GetSingleMetricAllDimensions.html