Simply adding opentelemetry java agent will render span hello-fetch outside of hello trace in jaeger. Furthermore traces from autoinstrumentation are not included in root span. Remove java agent to compare results.

Trace without opentelemetry agent:

Trace with opentelemetry agent:

Reproduce:

• Run jaeger

  ```
  docker run -d --name jaeger \
    -e COLLECTOR_ZIPKIN_HOST_PORT=:9411 \
    -e COLLECTOR_OTLP_ENABLED=true \
    -p 6831:6831/udp \
    -p 6832:6832/udp \
    -p 5778:5778 \
    -p 16686:16686 \
    -p 4317:4317 \
    -p 4318:4318 \
    -p 14250:14250 \
    -p 14268:14268 \
    -p 14269:14269 \
    -p 9411:9411 \
    jaegertracing/all-in-one:1.38
    ```
  

  • Run HelloWorld
    • Use javaagent: -javaagent:/xx/opentelemetry-javaagent.jar
    • Use env variables: OTEL_SERVICE_NAME=example-app;OTEL_TRACES_EXPORTER=jaeger;OTEL_EXPORTER_JAEGER_ENDPOINT=http://localhost:14250;OTEL_METRICS_EXPORTER=none
  • Make request to /hello curl localhost:8080/hello
  • See trace in jaeger http://localhost:16686/search?service=example-app

Note! Identical results with two different Jaeger tracers one from zio-telemetry and one from https://kadek-marek.medium.com/trace-your-microservices-with-zio-telemetry-5f88d69cb26b