add go example

[zeitlinger]

No description provided.

[zeitlinger]

file diff doesn't show, this was the old version:

#!/bin/bash

cd example-app
if [[ ! -f ./target/example-app.jar ]] ; then
    ./mvnw clean package
fi
if [[ ! -f ./opentelemetry-javaagent.jar ]] ; then
    curl -sOL https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v2.0.0/opentelemetry-javaagent.jar
fi
export OTEL_EXPORTER_OTLP_PROTOCOL=grpc
export OTEL_SEMCONV_STABILITY_OPT_IN=http
export OTEL_RESOURCE_ATTRIBUTES="service.name=example-app,service.instance.id=localhost:8080"
java -Dotel.metric.export.interval=500 -Dotel.bsp.schedule.delay=500 -javaagent:opentelemetry-javaagent.jar -jar ./target/example-app.jar

[zeitlinger]

in the new version

• removed export OTEL_SEMCONV_STABILITY_OPT_IN=http that is no longer needed
• don't reuse old downloaded jar if the version doesn't match

[grcevski]

LGTM! Great work!

I just have one comment/question, do you think it's OK to change the default port for the Go application so it doesn't conflict with what Java uses? That way we can run both at the same time...

[fstab]

LGTM too, thanks for adding a Go example!

Optional remark: We could add a comment in the OATS-related files with a link to https://github.com/grafana/oats in case people are wondering what these files are for.

[zeitlinger]

I just have one comment/question, do you think it's OK to change the default port for the Go application so it doesn't conflict with what Java uses? That way we can run both at the same time...

@grcevski the traffic script goes to 8080 - should this script hit all applications?

[grcevski]

I just have one comment/question, do you think it's OK to change the default port for the Go application so it doesn't conflict with what Java uses? That way we can run both at the same time...

@grcevski the traffic script goes to 8080 - should this script hit all applications?

Hm yeah, I am not sure what's best then. Maybe leave it as is, if it goes to both, then what if a user only boots Java, the script will hit something else or non existent port.

At least with duplicate port they will see it and adjust if they need to. LGTM with out my suggestion.

[zeitlinger]

Hm yeah, I am not sure what's best then. Maybe leave it as is, if it goes to both, then what if a user only boots Java, the script will hit something else or non existent port.

At least with duplicate port they will see it and adjust if they need to. LGTM with out my suggestion.

I hit all ports - but ignore errors

[grcevski]

Hm yeah, I am not sure what's best then. Maybe leave it as is, if it goes to both, then what if a user only boots Java, the script will hit something else or non existent port.
At least with duplicate port they will see it and adjust if they need to. LGTM with out my suggestion.

I hit all ports - but ignore errors

Great!