AWS::CloudWatch::Alarm

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-cw-alarm.html

• AWS::CloudWatch::AnomalyDetector

Autoscaling

 AppScaleUpPolicy:
    Type: AWS::AutoScaling::ScalingPolicy
    Properties:
      AdjustmentType: ChangeInCapacity
      AutoScalingGroupName: !Ref DeployAppASG
      Cooldown: '60'
      ScalingAdjustment: 1

AppScaleDownPolicy:
    Type: AWS::AutoScaling::ScalingPolicy
    Properties:
      AdjustmentType: ChangeInCapacity
      AutoScalingGroupName: !Ref DeployAppASG
      Cooldown: '300'
      ScalingAdjustment: -1

CPU alarm

CPUAlarmHigh:
   Type: AWS::CloudWatch::Alarm
   Properties:
     AlarmDescription: Scale-up if CPU > 80% for 5 minutes
     MetricName: CPUUtilization
     Namespace: AWS/EC2
     Statistic: Average
     Period: 300
     EvaluationPeriods: 2
     Threshold: 80
     AlarmActions: [!Ref AppScaleUpPolicy]
     Dimensions:
     - Name: AutoScalingGroupName
       Value: !Ref DeployAppASG
     ComparisonOperator: GreaterThanThreshold

 CPUAlarmLow:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmDescription: Scale-down if CPU < 60% for 5 minutes
      MetricName: CPUUtilization
      Namespace: AWS/EC2
      Statistic: Average
      Period: 300
      EvaluationPeriods: 2
      Threshold: 80
      AlarmActions: [!Ref AppScaleDownPolicy]
      Dimensions:
      - Name: AutoScalingGroupName
        Value: !Ref DeployAppASG
      ComparisonOperator: LessThanThreshold

SNS

MySNSTopic:
 Type: AWS::SNS::Topic
 Properties:
   Subscription:
   - Endpoint: "add valid email address"
     Protocol: email

See also

• AWS monitoring: AWS CloudWatch: Logs, Logs Insights, Events, Alarms, aws cloudwatch, aws logs, Amazon CloudWatch Lambda Insights, AWS CloudWatch Container Insights, CloudWatch Dashboard, AWS CloudWatch Automatic Dashboards, Amazon RDS Performance Insights, Amazon CloudWatch Metric Streams, Amazon CloudWatch Lambda Insights, CloudwatchLogsGroup, Amazon CloudWatch Anomaly Detection, cloudwatch kms key id, CloudWatch agent, Amazon CloudWatch Evidently, namespace, Synthetics, Synthetics Canaries, YACE, Prometheus cloudwatch exporter, Amazon CloudWatch Observability Access Manager, Amazon CloudWatch Live Tail

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/quickref-cloudwatch.html

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/quickref-sns.html