A CloudWatch Alarm that triggers when changes are made to EC2 Instances.

 
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AWSTemplateFormatVersion: '2010-09-09'
Resources:
  CloudWatchAlarm:
    Type: 'AWS::CloudWatch::Alarm'
    Properties:
      AlarmName: ec2_changes
      AlarmDescription: A CloudWatch Alarm that triggers when changes are made to EC2 Instances.
      MetricName: EC2InstanceEventCount
      Namespace: CloudTrailMetrics
      Statistic: Sum
      Period: '300'
      EvaluationPeriods: '1'
      Threshold: '1'
      ComparisonOperator: GreaterThanOrEqualToThreshold
      AlarmActions:
        - ''
      TreatMissingData: notBreaching
  MetricFilter:
    Type: 'AWS::Logs::MetricFilter'
    Properties:
      LogGroupName: ''
      FilterPattern: >-
        { ($.eventName = RunInstances) || ($.eventName = RebootInstances) ||
        ($.eventName = StartInstances) || ($.eventName = StopInstances) ||
        ($.eventName = TerminateInstances) }
      MetricTransformations:
        - MetricValue: '1'
          MetricNamespace: CloudTrailMetrics
          MetricName: EC2InstanceEventCount
Parameters: {}
Metadata: {}
Conditions: {}

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Alarm Configuration


Metric Filter Configuration


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