AWSTemplateFormatVersion: '2010-09-09'
Description: Composite alarm resources for trivia site

Parameters:
  Stage:
    Type: String
    AllowedValues:
      - "Test"
      - "Prod"

  NotificationsTopic:
    Type: String
    Default: reinvent-trivia-notifications

Mappings:
  StageLowerCaseMap:
    Test: { "Lower": "test" }
    Prod: { "Lower": "prod" }

Resources:
  CompositeAlarm:
    Type: AWS::CloudWatch::CompositeAlarm
    Properties:
      AlarmName: !Sub "TriviaGame-CompositeAlarm-${Stage}"
      AlarmDescription: "Composite alarm that aggregates all individual component alarms"
      ActionsEnabled: true
      AlarmActions:
        - !Sub "arn:${AWS::Partition}:sns:${AWS::Region}:${AWS::AccountId}:${NotificationsTopic}"
      AlarmRule: !Sub
        - |-
          ALARM("TriviaBackend${Stage}-Unhealthy-Hosts") OR
          ALARM("TriviaBackend${Stage}-Http-500") OR
          ALARM("TriviaGameChatBot${Stage}-BotLatestVersionErrors") OR
          ALARM("TriviaGameChatBot${Stage}-BotAliasErrors") OR
          ALARM("Synthetics-Alarm-trivia-game-${StageLowerCase}")
        - { StageLowerCase: !FindInMap ["StageLowerCaseMap", !Ref Stage, "Lower"] }