ACS::ECS::AlarmScalingThreshold.yml

FormatVersion: OOS-2019-06-01
Description: Alarm notification when spot instance discount or spot price exceeds threshold.
Parameters:
  regionId:
    Description: The region id.
    Type: String
  zoneId:
    Description: The zone id.
    Type: String
  discountJsonInfo:
    Description: The discount info.
    Type: Json
  threshold:
    Description: The discount or price threshold.
    Type: Number
  scalingGroupId:
    Description: The scaling group id.
    Type: String
  taskType:
    Description: The monitoring threshold task type.
    Type: String
Tasks:
  - Name: selectTask
    Action: 'ACS::Choice'
    Description: Select the type of task that performs the monitoring threshold.
    Properties:
      DefaultTask: 'ACS::END'
      Choices:
        - When:
            'Fn::Equals':
              - Discount
              - '{{ taskType }}'
          NextTask: checkDiscountThreshold
        - When:
            'Fn::Equals':
              - Price
              - '{{ taskType }}'
          NextTask: checkSpotPriceThreshold
  - Name: checkDiscountThreshold
    Action: 'ACS::Choice'
    Description: Check if the actual discount exceeds the threshold.
    Properties:
      DefaultTask: 'ACS::END'
      Choices:
        - When:
            'Fn::Equals':
              - true
              - 'Fn::Jq':
                  - First
                  - '.realThreshold >= {{ threshold }}'
                  - '{{ discountJsonInfo }}'
          NextTask: describeSpotPriceHistory
  - Name: checkSpotPriceThreshold
    Action: 'ACS::Choice'
    Description: Check if the actual discount exceeds the threshold.
    Properties:
      DefaultTask: 'ACS::END'
      Choices:
        - When:
            'Fn::Equals':
              - true
              - 'Fn::Jq':
                  - First
                  - '.spotPrice >= {{ threshold }}'
                  - '{{ discountJsonInfo }}'
          NextTask: describeSpotPriceHistory
  - Name: describeSpotPriceHistory
    Action: 'ACS::ExecuteAPI'
    Description: Get the latest discounts or spot price on spot instance.
    Properties:
      Service: ECS
      API: DescribeSpotPriceHistory
      Parameters:
        RegionId: '{{ regionId }}'
        InstanceType:
          'Fn::Jq':
            - First
            - .instanceType
            - '{{ discountJsonInfo }}'
        NetworkType: vpc
        ZoneId: '{{ zoneId }}'
    Outputs:
      spotPrice:
        Type: String
        ValueSelector: '.SpotPrices.SpotPriceType[-1].SpotPrice'
      instanceType:
        Type: String
        ValueSelector: '.SpotPrices.SpotPriceType[-1].InstanceType'
      zoneId:
        Type: String
        ValueSelector: '.SpotPrices.SpotPriceType[-1].ZoneId'
      actualDiscount:
        Type: String
        ValueSelector: '.SpotPrices.SpotPriceType[-1] | .SpotPrice / .OriginPrice * 10000 | floor as $num | $num/100'
Outputs:
  discountInfo:
    Type: Json
    Value:
      scalingGroupId: '{{ scalingGroupId }}'
      instanceType: '{{ describeSpotPriceHistory.instanceType }}'
      zoneId: '{{ describeSpotPriceHistory.zoneId }}'
      spotPrice: '{{ describeSpotPriceHistory.spotPrice }}'
      actualDiscount: '{{ describeSpotPriceHistory.actualDiscount }}'