How to add custom annotation/metadata for lambda functions with ADOT auto-instrumentation

[spongenee]

I scrolled through https://aws-otel.github.io/docs/getting-started/x-ray
I have a feeling that what I am thinking is possible and my first attempt of course didn't work but you might understand what I want to achieve.

I added the aws-otel-nodejs layer to my lambda function and auto instrumentation worked, traces show up in the x ray console and with some otel metadata for the subsegments. I would like to add custom annotation/metadata to the segments within the function.

My attempt was to use aws-xray-sdk-core, get the existing segment and add metadata to it.. Maybe the problem is I should be using Opentelemetry sdk instead? What's the correct way to achieve this?

        var document = AWSXRay.getSegment();
        for (const header in event.headers){
            document.addMetadata(header,event.headers[header],"headers");
        }