How to Track and Optimize Cloud Costs Across Multiple AWS Accounts After a Big Migration

Managing cloud costs after a large AWS migration requires a layered approach covering visibility and allocation, commitment optimization, resource waste remediation, Kubernetes cost allocation, and environment lifecycle management rather than relying on a dashboard alone. The recommended foundation is AWS Organizations with consolidated billing, enforced cost-allocation tags, Cost and Usage Report 2.0 exported to S3 and queried with Athena, plus AWS Budgets and Cost Anomaly Detection; paid tools such as Vantage, CloudZero, and Apptio Cloudability build on this data for reporting and chargeback. The text advises removing zombie resources, right-sizing lift-and-shift infrastructure, scheduling non-production environments, and addressing shared Kubernetes costs with Kubecost or OpenCost before purchasing Savings Plans, since early migration usage and temporary AWS credits can distort the baseline. It distinguishes commitment tools such as ProsperOps and nOps from remediation products such as CloudFix, AWS Compute Optimizer, and Sedai, while presenting Qovery as a complementary platform for reducing non-production spending through auto-stop policies, preview environments, and shared clusters. A proposed 90-day sequence prioritizes low-risk cleanup first, engineering changes such as rightsizing and non-production scheduling next, and commitments only after usage stabilizes, followed by ongoing ownership, anomaly routing, provisioning guardrails, and unit-cost tracking.

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