Fix telemetry span duration for request spans #70908
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dvoytenko
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Oct 8, 2024
| (span) => { | ||
| if (span) { | ||
| const res = args[1] | ||
| res.end = new Proxy(res.end, { |
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Is there no res.on('end', ...)?
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Correct me if I am wrong, but res.on('end') will not work on Vercel because the underlying lambdas freeze on res.end() which happens before res.on('end').
If that is not the case anymore it would be amazing because it would simplify the code here a lot.
lforst
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Oct 8, 2024
…13904) Drop all spans/transactions emitted by Next.js for pages router API routes because they are currently super buggy with wrong timestamps. Fix pending: vercel/next.js#70908 This is just a bit of prep-work so we can at some point disable the logic where we turn on all Next.js spans and still have high quality data.
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What?
Fixes a bug where telemetry spans for Pages Router requests are way too short.
Why?
The
handleRequestImplfunction is wrapped withtracer.trace()to trace the duration of Next.js handling a request. Thetracer.trace()function immediately starts a span and ends it when the return value of the passed callback resolves.In the pages router
handleRequestImplmore or less immediately resolves, even though the request is still being processed. The started span is immediately ended, not waiting forres.end(), which should be the actual end timestamp of the span.How?
I adjusted the
tracer.trace()function to take an optionalmanualSpanEndoption, which will make thetracer.trace()function not end the span when the promise resolves. Additionally, we now manually end the request span with theonClosehook.Relates to #64723