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AWS Guide: How to Instrument Applications for Observability Using X-Ray and CloudWatch

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AWS's Developer Associate exam domain on troubleshooting and optimization covers how to instrument applications for full observability using services like X-Ray, CloudWatch, and structured logging. Observability differs from basic monitoring by explaining why a system behaves a certain way, not just whether it is healthy, combining logs, metrics, and distributed traces. AWS X-Ray enables distributed tracing by tracking requests across multiple services through concepts such as traces, segments, subsegments, and annotations. Annotations are indexed key-value pairs that allow developers to search and filter traces, while metadata stores richer debug data that is not searchable. Together, these tools help developers identify root causes of issues such as latency spikes or throttling errors in complex, distributed architectures.

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AWS Guide: How to Instrument Applications for Observability Using X-Ray and CloudWatch · ShortSingh