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AWS X-Ray
Developer Guide

Elastic Load Balancing and AWS X-Ray

Elastic Load Balancing application load balancers add a trace ID to incoming HTTP requests in a header named X-Amzn-Trace-Id.

X-Amzn-Trace-Id: Root=1-5759e988-bd862e3fe1be46a994272793

Trace ID Format

A trace_id consists of three numbers separated by hyphens. For example, 1-58406520-a006649127e371903a2de979. This includes:

  • The version number, that is, 1.

  • The time of the original request, in Unix epoch time, in 8 hexadecimal digits.

    For example, 10:00AM December 2nd, 2016 PST in epoch time is 1480615200 seconds, or 58406520 in hexadecimal.

  • A 96-bit identifier for the trace, globally unique, in 24 hexadecimal digits.

Load balancers do not send data to X-Ray, and do not appear as a node on your service map.

For more information, see Request Tracing for Your Application Load Balancer in the Elastic Load Balancing Developer Guide.