Example resource to create a CloudWatch Dashboard for an Alarm in CloudFormation

cw-dashboard-alarm.yml

  CloudWatchDashboard:
    Type: AWS::CloudWatch::Dashboard
    Properties:
      DashboardName: !Sub ${AWS::StackName}
      DashboardBody: !Sub
        - |
          {
            "periodOverride": "inherit",
            "widgets": [
              {
                "type": "alarm",
                "x": 0,
                "y": 0,
                "width": 12,
                "height": 6,
                "properties": {
                  "alarms": ["${ECSCPUUtilizationAlarmArn}"],
                  "title": "Cluster CPU Utilization"
                }
              }
            ]
          }
        - ECSCPUUtilizationAlarmArn: !GetAtt ECSCPUUtilizationAlarm.Arn