CloudWatch vs Prometheus: Setup, Cost, and Tradeoffs

CloudWatch and Prometheus solve overlapping problems, but they approach monitoring from very different starting points. CloudWatch provides metrics and logs for AWS resources out of the box (and for distributed tracing, provides X-Ray integration). Prometheus is an open-source metrics engine you run and configure yourself, built for flexibility and portability across any environment. If your stack is mostly AWS-native services like Lambda and managed databases, CloudWatch gets you to baseline visibility fastest. If you run Kubernetes, operate across multiple clouds, or need deep custom metric analysis with PromQL, Prometheus gives you more control. This article compares CloudWatch and Prometheus through hands-on setup, feature coverage, cost patterns, and real practitioner feedback, so you can decide which fits your operating model. Setting Up CloudWatch CloudWatch setup effort varies depending on which AWS service you are monitoring and what level of visibility you need. Metrics: Buil