CloudTrail 管理イベントの重複コストをAWS Budgets で検知、Eメールに送信する

##### 入力(適宜変更してください)
# 予算名
budget_name="CloudTrail_Detect_DuplicatedEventsRecord"
# 通知先Eメールアドレス
mail_to_notify="cost@example.com"

##### CreateBudget API パラメータの準備

budget_config=$(cat <<EOF
{
  "BudgetName": "${budget_name}",
  "BudgetLimit": {
    "Amount": "1.0",
    "Unit": "Events"
  },
  "CostFilters": {
    "UsageType": [
      "USW2-PaidEventsRecorded",
      "USW1-PaidEventsRecorded",
      "USE1-PaidEventsRecorded",
      "USE2-PaidEventsRecorded",
      "SAE1-PaidEventsRecorded",
      "EUW3-PaidEventsRecorded",
      "EUW2-PaidEventsRecorded",
      "EUN1-PaidEventsRecorded",
      "EUC1-PaidEventsRecorded",
      "EU-PaidEventsRecorded",
      "CAN1-PaidEventsRecorded",
      "APS3-PaidEventsRecorded",
      "APS2-PaidEventsRecorded",
      "APS1-PaidEventsRecorded",
      "APN3-PaidEventsRecorded",
      "APN2-PaidEventsRecorded",
      "APN1-PaidEventsRecorded"
    ]
  },
  "TimeUnit": "DAILY",
  "BudgetType": "USAGE"
}
EOF
)

notification_config=$(cat <<EOF
[
  {
    "Notification": {
      "NotificationType": "ACTUAL",
      "ComparisonOperator": "GREATER_THAN",
      "Threshold": 100.0,
      "ThresholdType": "PERCENTAGE",
      "NotificationState": "ALARM"
    },
    "Subscribers": [
      {
        "SubscriptionType": "EMAIL",
        "Address": "${mail_to_notify}"
      }
    ]
  }
]
EOF
)

account_id=$(aws sts get-caller-identity --query Account --output text)

##### 予算作成
aws budgets create-budget \
  --account-id "${account_id}" \
  --budget "${budget_config}" \
  --notifications-with-subscribers "${notification_config}"