Which service collects data about requests your application serves and provides tools to view, filter, and gain insights for optimization?

• A. AWS Cloud9
• B. AWS X-Ray
• C. AWS CodeArtifact
• D. AWS CodeCommit

Answer: (B)

Observability through distributed tracing enables you to see how requests flow through your application and where delays or failures occur. AWS X-Ray collects data about each request as it travels through your services, building traces with segments for every component involved. In the X-Ray console you get a service map that visualizes dependencies and performance, plus the ability to view individual traces, filter by latency or error type, and drill into timings to identify bottlenecks. Instrumenting your app with the X-Ray SDK (and optional sampling) lets you add annotations and metadata to make queries more precise, giving you actionable insights to optimize performance and reliability. The other options don’t provide this end-to-end request tracing and analysis: the first is an integrated development environment, the second is a package repository, and the third is a Git-based code repository.