AWS X-Ray makes it easy for developers to analyze the behavior of their distributed applications by providing request tracing, exception collection, and profiling capabilities.  

Developer Guide
Describes how to get started and instrument your applications using AWS X-Ray.
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AWS X-Ray SDK for Java API Reference
Describes all of the classes included in the AWS X-Ray SDK for Java.
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AWS X-Ray SDK for .NET API Reference
Describes all of the classes included in the AWS X-Ray SDK for .NET.
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API Reference
Describes all the API operations for AWS X-Ray in detail. Also provides details of request and response syntax and errors for the supported web services protocols.
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AWS X-Ray SDK for Node.js API Reference
Describes all of the classes included in the AWS X-Ray SDK for Node.js.
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