A microservices application written in Python uses AWS X-Ray. Some services are not appearing on the X-Ray service map during testing. What should the developer do to ensure all services show up in the X-Ray service map?

To ensure all services appear on the X-Ray service map, each service must be explicitly instrumented. This involves installing the X-Ray SDK for Python and integrating it into the service's code to send trace data to X-Ray. Without instrumentation, X-Ray cannot collect data from a service, and therefore it will not appear on the service map. Adjusting the sampling rate would only affect how many traces are recorded from already-instrumented services, not make uninstrumented services appear. Enabling X-Ray data aggregation in CloudWatch Logs is not the mechanism for services to appear on the X-Ray service map; X-Ray receives trace data directly from SDKs. Increasing the service map timeout setting in the X-Ray console would not resolve the issue of missing services, as it pertains to the display duration of the map, not data collection.