fix(node): Ensure traces are propagated without spans in Node 22+ #16221
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AbhiPrasad
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Co-authored-by: Abhijeet Prasad <[email protected]>
Co-authored-by: Andrei <[email protected]>
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Update: This is also available on Node 22, so Node 22 & Node 24 work, which is pretty OK I'd say for now... |
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Today, if the
httpIntegrationis used without spans (e.g. in a custom OTEL setup or when settinghttpIntegration({ spans: false })manually), outgoing requests will not have traces propagated.This PR fixes this by using the
http.client.request.createddiagnostics channel to add the trace headers in this scenario.However, sadly this channel was only added in Node 22, so it does not work on versions before that.
I suppose this is still worth adding because it is better than what we have today (which is that it does not work at all). We may think about making this work for Node <22, but this would require us monkey patching http again, which we really do not want to do... Also note that as of now this should not really affect the vast majority of cases, as unless you specifically opt out of spans today this will always work as we always add the otel http instrumentation by default. And in custom otel setups, users will usually have this set up anyhow. (Also, fetch works in all environments as expected).
If we want to, in a follow up, avoid adding the otel spans instrumentation if performance is disabled, we need to think about this... an option could be to always adding the instrumentation on node <22, and only skip it on Node 22+. But this can be looked at separately, this PR at least makes things better than before on Node 22+...
This supersedes #15735