Adding user agent to root span

[morley92]

How possible would it be to add the user agent OTEL attribute to the root span? Ideally user_agent.original

I was hoping to achieve this by using the attributesFromHeaders function but this seems to have no effect, e.g:

attributesFromHeaders: {
  'user_agent.original': 'User-Agent'
}

Reading through the code it seems like user agent is added in certain circumstances but this doesn't appear be included in our spans - see

otel/packages/otel/src/vercel-request-context/attributes.ts

Line 24 in 879fdcb

[SemanticAttributes.HTTP_USER_AGENT]: context.headers["user-agent"],

We're not hosting with Vercel if that helps.

Thanks