Can I capture the argument value from a method using the agent?

[dv-morais]

Hello everyone, sorry for the english.

I'll be short.

Is it possiblel to capture an argument value from a intrumented method using the agent? I want to know the value being passed by my app to said argument during execution.

Thanks everyone.

[jaydeluca]

You could use the @WithSpan and @SpanAttribute annotations to convert arguments into span attributes. See the docs here

public class MyClass {

    @WithSpan
    public void myMethod(@SpanAttribute("parameter1") String parameter1,
        @SpanAttribute("parameter2") long parameter2) {
        <...>
    }
}

[dv-morais]

You could use the @WithSpan and @SpanAttribute annotations to convert arguments into span attributes. See the docs here

public class MyClass {

    @WithSpan
    public void myMethod(@SpanAttribute("parameter1") String parameter1,
        @SpanAttribute("parameter2") long parameter2) {
        <...>
    }
}

The question is...

is it possible to do it without touching the code?

[laurit]

is it possible to do it without touching the code?

It is not possible out of the box. You can write a custom extension for this, see https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/examples/extension