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Review your AWS environment when its security, resilience, performance, cost, or operating practices no longer clearly fit the workload. The seven signs below are practical prompts drawn from AWS Well-Architected guidance—not an official AWS diagnostic checklist—and should be judged in the context of each workload.
1. Workload health is hard to see, or operations depend on recurring manual work
A review may be due if the team cannot readily tell whether a workload is operating as intended, struggles to investigate operational issues, or repeatedly relies on manual work that could be improved. These are practical warning signs, not thresholds published by AWS. The Operational Excellence pillar focuses on operating workloads effectively, gaining insight into operations, and continuously improving processes. Start by checking whether the team has useful operational visibility, clear ownership, and a way to learn from recurring work. AWS Well-Architected Framework
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2. Access, identity, or security responsibilities are unclear
Review the environment if the team cannot confidently explain who can access which resources, whether actions and changes can be traced, or who owns key security tasks. AWS recommends least privilege, traceability, layered security, and preparation for security events. Its security guidance states: “Implement the principle of least privilege, and enforce separation of duties with appropriate authorization for each interaction with your AWS resources.” This principle appears in the AWS Well-Architected security design principles reproduced in AWS Prescriptive Guidance, Security foundations.
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Security is shared between AWS and the customer; the division depends on the service. Customers remain responsible for managing and classifying their data and setting appropriate IAM permissions. Depending on the service, they may also manage guest operating-system updates and patches, application software, server-side encryption choices, network routes, and security-group configuration. With more abstracted services such as Amazon S3 and DynamoDB, AWS operates more of the infrastructure layer, but customers still manage their data and access choices. Avoid assuming that AWS or the customer handles security as a whole. AWS Prescriptive Guidance, Security foundations
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3. Vulnerabilities or security findings remain unresolved
An unresolved backlog, uncertainty about how vulnerabilities are detected, or unclear incident-response arrangements are reasons to reassess security practices. AWS describes vulnerability management as continuously identifying, classifying, remediating, and mitigating vulnerabilities, and includes threat detection and incident response capabilities in its security foundations. The existence of findings does not by itself establish a particular level of risk; their significance depends on the workload and context. AWS does not specify a universal backlog size or age that triggers a review. AWS Prescriptive Guidance, Security foundations
4. Recovery plans are untested, or confidence in resilience has fallen
If recovery assumptions have changed or the team lacks current evidence that recovery procedures work, reassess the workload’s reliability. AWS’s Reliability pillar includes operating and testing a workload throughout its lifecycle, as well as the ability to recover from failure. A review can examine the assumptions behind recovery plans and the evidence from tests; conducting a review does not itself guarantee recovery. AWS Well-Architected Framework
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5. Performance no longer meets requirements as demand changes
Rising latency, resource saturation, or a workload whose demand has changed are useful prompts to investigate—not official AWS trigger thresholds. The Performance Efficiency pillar is about using resources efficiently to meet system requirements and maintaining that efficiency as demand changes. Check whether the current design and resource choices still meet the workload’s requirements under its present demand. AWS Well-Architected Framework
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6. Cloud costs are difficult to explain or appear disconnected from value
Billing surprises or unexplained spending growth justify investigation, but they do not prove that any particular service is wasteful. AWS describes Cost Optimization as avoiding unnecessary costs, understanding spending, and selecting the right number and types of resources. Compare spending with workload needs and the value the workload delivers; assess individual resource choices in that context rather than treating a bill or a single increase as a diagnosis. AWS Well-Architected Framework
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7. Resource use and sustainability assumptions have not kept pace
Revisit design and utilization assumptions when a workload or its demand has changed. AWS’s Sustainability pillar focuses on minimizing environmental impacts, including energy consumption and resource efficiency. Consider resource use in the context of how the workload operates; a single bill or metric cannot, by itself, establish the workload’s environmental impact. AWS Well-Architected Framework
How to weigh the signs across a workload
AWS Well-Architected organizes its guidance around six pillars: Operational Excellence, Security, Reliability, Performance Efficiency, Cost Optimization, and Sustainability. A useful review considers business impact and risk across these dimensions, then applies the workload’s specific requirements. The trade-offs differ by workload: a development environment may prioritize cost over reliability, while a mission-critical workload may accept higher cost for reliability; an ecommerce workload may prioritize performance. AWS says Security and Operational Excellence are generally not traded off against the other pillars. AWS Well-Architected Framework
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to start an AWS Well-Architected review
AWS describes the Framework Review in three phases: prepare, review, and improve. The review uses foundational questions to understand how a workload aligns with best practices; the improve phase turns findings into actionable workload improvements. The AWS Well-Architected Tool documentation describes reviewing workloads against best practices, measuring improvements, and receiving optimization recommendations. Treat the tool and process as ways to structure assessment and improvement, not as guarantees that every risk will be detected or fixed. AWS Well-Architected Framework Review · AWS Well-Architected Documentation
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