Discovering What Caused Spending to Rise from the Penultimate month and the Last: Carefully Analyzing Two Accounts and the Application (Fargate)

Guidance

Assuming that the two AWS accounts are under the same payer account - you can use Cost Explorer in the payer account to view the spend from the penultimate month and the last. A combination of Cost Explorer report parameters can help you discover the services attributing to the rise the spend.

Under report parameters (right side) of the Cost Explorer.

1. Use Date Range to define the months.
2. Use Group By - Dimension as Service
3. Use Filter - Linked Account as the two AWS account

You can use additional filters - Usage type, Usage type based on your requirements.

AWS Cost Explorer

AWS Cost Explorer is a tool that enables you to view and analyze your costs and usage. You can explore your usage and costs using the main graph, the Cost Explorer cost and usage reports, or the Cost Explorer RI reports. You can view data for up to the last 13 months, forecast how much you're likely to spend for the next 12 months, and get recommendations for what Reserved Instances to purchase. You can use Cost Explorer to identify areas that need further inquiry and see trends that you can use to understand your costs.

You can view your costs and usage using the Cost Explorer user interface free of charge. You can also access your data programmatically using the Cost Explorer API. Each paginated API request incurs a charge of $0.01. You can't disable Cost Explorer after you enable it.

In addition, Cost Explorer provides preconfigured views that display at-a-glance information about your cost trends and give you a head start on customizing views that suit your needs.

Exploring your data using Cost Explorer

On the Cost Explorer dashboard, Cost Explorer shows your estimated costs for the month to date, your forecasted costs for the month, a graph of your daily costs, your five top cost trends, and a list of reports that you recently viewed. All costs reflect your usage up to the previous day. For example, if today is December 2, the data includes your usage through December 1.

Exploring more data for advanced cost analysis

Cost Explorer provides AWS cost and usage data for the current month and up to the previous 13 months at daily and monthly granularity. You can query this data in the console or using the Cost Explorer API. You can enable multi-year data (at monthly granularity) and more granular data (at hourly and daily granularity) for the previous 14 days. Once enabled, you can use this data in the console or using the Cost Explorer API.