How to add custom attributes to traces?

[KevinGuancheDarias]

Hello I have a Spring boot app, I just added the javaagent, and the application is sending a lot of useful information, the problem is that I need to be able to add custom attribute to the data, in the current case the username.

How can I archieve that?, I already tried with Span.current() (doesn't return the trace that should has been generated by the javaagent), I also tried with SpanProcessor (I don't know how to add it to the javaavent), AutoConfigurationCustomizer is not fired neither

I was expected to do something like

class SomeFilter implements Filter { 

@Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // Add the logged user to the trace here
        chain.doFilter(request,response);
    }

}

Thanks in advance!

[trask]

I would expect Span.current().setAttribute("my-attr", "my-val") to work inside of doFilter(), are there any more details you can provide that could help us understand why it's not working for you?

(SpanProcessor is a whole different story and more complex with the Java agent, see https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/examples/extension#extensions)

[KevinGuancheDarias]

Hello @trask , first of all thanks for your time, it's nor working the Span.current() not only in the Filter, nor it works in the endpoint, I don't know why, it returns an invalid trace, the APM is properly registering the call to the endpoint

Lol, someone told me they had only 1 dep in the pom, and then it worked, I let it reported here, because maybe others has the same problem

I had the following deps

        <dependency>
            <groupId>io.opentelemetry</groupId>
            <artifactId>opentelemetry-api-trace</artifactId>
            <version>0.13.1</version>
        </dependency>

        <dependency>
            <groupId>io.opentelemetry</groupId>
            <artifactId>opentelemetry-sdk</artifactId>
            <version>1.24.0</version>
        </dependency>
        <dependency>
            <groupId>io.opentelemetry</groupId>
            <artifactId>opentelemetry-api</artifactId>
            <version>1.28.0</version>
        </dependency>

After removing the unrequired deps and let the pom like this

<dependency>
            <groupId>io.opentelemetry</groupId>
            <artifactId>opentelemetry-api</artifactId>
            <version>1.28.0</version>
        </dependency>

It now works properly! 🍷