{
  "ComparisonOperator": "LessThanOrEqualToThreshold",
  "EvaluationPeriods": 1,
  "MetricName": "CPUUtilization",
  "Namespace": "AWS/EC2",
  "Period": 900,
  "Statistic": "Average",
  "Threshold": 30,
  "ActionsEnabled": true,
  "AlarmActions": [
    "youraction"
  ]
}