Attributes set using attributesFromHeaders not showing up on trace

The attributesFromHeaders option does not seem to be working correctly, or it needs some more documentation for how to configure it.

I've configured everything according to the Using @vercel/otel page, and configured the OpenTelemetry dev environment.

My instrumentation.ts file:

export async function register() {
  registerOTel({
    serviceName: "sample-service-name",
    attributes: {
      "app.environment": process.env.NEXT_PUBLIC_ENVIRONMENT,
      "app.test": "hello",
    },
    attributesFromHeaders: {
      "app.referer": "referer",
      "app.host": "host",
      "app.accept": "accept",
      "app.method": "method",
      "http.referer": "referer",
      "http.host": "host",
      "http.accept": "accept",
      "http.method": "method",
    },
  });
}

Looking at the collected trace in Zipkin, all the header attributes are missing:

Tag	Value
app.environment	local
app.test	hello
http.method	GET
http.route	/[locale]/[[...slug]]
http.status_code	200
http.target	/sample-page
next.route	/[locale]/[[...slug]]
next.rsc	false
next.span_name	GET /[locale]/[[...slug]]
next.span_type	BaseServer.handleRequest
node.env	development
operation.name	web.request
otel.library.name	next.js
otel.library.version	0.0.1
resource.name	GET /[locale]/[[...slug]]
telemetry.sdk.language	nodejs
telemetry.sdk.name	opentelemetry
telemetry.sdk.version	1.19.0
vercel.runtime	nodejs

Package	Version
next	14.2.3
@vercel/otel	1.10.0
@opentelemetry/api	1.9.0

Possible duplicate of https://github.com/vercel/otel/issues/109

vercel / otel

Attributes set using attributesFromHeaders not showing up on trace #121