Attributes set using attributesFromHeaders not showing up on trace

[cbodin]

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 #109