X-Ray

• App Insights: Collects application data for viewing, filtering, and gaining insights about requests and responses.

• Downstream. View calls to downstream AWS resources and other microservicers/APIs or databases

• Traces. Receives traces from applications

• Multiple Options. Can add tracing headers, send trace data, or run the X-Ray deamon

Key concepts:

• Segments: Data containing resource names, request details, and other information

• Subsegments: Segments providing more granular timing information and details

• Service graph: Graphical representation of interacting services in requests

• Traces: Trace ID tracks paths of requests and traces collect all segments in a request.

• Tracing headers: Extra HTTP headers containing sampling decisions and trace ID

• Tracing header containing added information is named X-Amzn-Trace-Id

AWS X-Ray Deamon

AWS software application that listens on UDP port 2000. It collects raw segment data and sends it to the AWS X-Ray API.

When the deamon is running, it works along with the AWS X-Ray SDKs

The Deamon can be run on:

• EC2 instances

• Amazon ECS

• AWS Lambda

• Elastic Beanstalk

• API Gateway

• SNS and SQS