How is the application affected by the Sampling rate in AWS XRay?

Question

In the AWS Xray documentation it is mentioned that the sdk applies sampling to the requests.
Now I want to implement distributed logging such that any request that comes in to the system can be tracked by using the X-Amzn-Trace-Id or some correlation ID, so that I can later execute a query to fetch all the logs for a given request (across all the microservices).
What is the best possible way to achieve it? Also, if there is a SNS Topic where I am publishing my events and then a Queue is listening to the Topic, then how can I include that relation in the Xray Map?

Answer 1

This is a common requirement in monitoring system, correlate traces, metrics and logs by keywords. In traces <-> logs case, it is by attaching trace id into logs. Please search topics like OpenTelemetry Logging Instrumentation

Regarding sampling, please check this table. Basically, not sampled still generates trace context for correlating logs.