template.yml

AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31

Description: A collection of utilities that integrate with Cost Explorer

Resources:
  DailySlackSnapshotFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/daily-slack-snapshot
      Description: >-
        Sends daily messages to Slack with AWS billing information
      Events:
        Cron:
          Properties:
            Description: Triggers the Cost Explorer report once a day
            Enabled: true
            Schedule: cron(0 14 * * ? *)
          Type: Schedule
      Handler: lambda_function.lambda_handler
      MemorySize: 512
      Policies:
        - Statement:
            - Action: events:PutEvents
              Effect: Allow
              Resource: !Sub arn:${AWS::Partition}:events:${AWS::Region}:${AWS::AccountId}:event-bus/default
              Sid: AllowDefaultEventBusPut
            - Action:
                - ce:GetCostAndUsage
                - ce:GetReservationCoverage
                - ce:GetReservationUtilization
                - ce:GetSavingsPlansCoverage
                - ce:GetSavingsPlansUtilization
              Effect: Allow
              Resource: "*"
              Sid: AllowCostExplorerRead
          Version: "2012-10-17"
      Runtime: python3.10
      Tags:
        prx:meta:tagging-version: 2021-04-07
        prx:cloudformation:stack-name: !Ref AWS::StackName
        prx:cloudformation:stack-id: !Ref AWS::StackId
        prx:ops:environment: Production
        prx:dev:application: Cost Explorer Toolkit
      Timeout: 16
  DailySlackSnapshotLogGroup:
    Type: AWS::Logs::LogGroup
    DeletionPolicy: Delete
    UpdateReplacePolicy: Delete
    Properties:
      LogGroupName: !Sub /aws/lambda/${DailySlackSnapshotFunction}
      RetentionInDays: 14
      Tags:
        - { Key: prx:meta:tagging-version, Value: "2021-04-07" }
        - { Key: prx:cloudformation:stack-name, Value: !Ref AWS::StackName }
        - { Key: prx:cloudformation:stack-id, Value: !Ref AWS::StackId }
        - { Key: prx:ops:environment, Value: Production }
        - { Key: prx:dev:application, Value: Cost Explorer Toolkit }
  DailySlackSnapshotErrorAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: "MINOR [Cost Explorer] Daily Snapshot <prod> EXPERIENCING ERRORS"
      AlarmDescription: >-
        The error rate on the daily Cost Explorer snapshot
        Lambda function has exceeded 0.
      ComparisonOperator: GreaterThanThreshold
      Dimensions:
        - Name: FunctionName
          Value: !Ref DailySlackSnapshotFunction
      EvaluationPeriods: 1
      MetricName: Errors
      Namespace: AWS/Lambda
      Period: 60
      Statistic: Sum
      Tags:
        - { Key: prx:meta:tagging-version, Value: "2021-04-07" }
        - { Key: prx:cloudformation:stack-name, Value: !Ref AWS::StackName }
        - { Key: prx:cloudformation:stack-id, Value: !Ref AWS::StackId }
        - { Key: prx:ops:environment, Value: Production }
        - { Key: prx:dev:application, Value: Cost Explorer Toolkit }
      Threshold: 0
      TreatMissingData: notBreaching