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fix(node): Flush buffered streamed spans on process exit - #25539

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Spans waiting in the stream buffer were dropped when a Node process exited on its own, fixed by flushing the buffer on beforeExit like we already do for logs and metrics.

The test emits beforeExit with a buffered span and checks it gets sent.

closes #25531

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bugbot run

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✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

Reviewed by Cursor Bugbot for commit 0dc8546. Configure here.

@logaretm
logaretm marked this pull request as ready for review October 19, 2026 17:58
@logaretm
logaretm requested a review from a team as a code owner October 19, 2026 17:58
@logaretm
logaretm requested review from JPeer264 and mydea and removed request for a team October 19, 2026 17:58
@linear-code

linear-code Bot commented Oct 19, 2026

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JS-3960

@logaretm
logaretm requested review from Lms24 and isaacs October 19, 2026 18:00
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github-actions Bot commented Oct 19, 2026 •

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size-limit report 📦

Compared: 4e966af (PR test merge using develop at ca4fc32)

Against: ca4fc32 (develop) · base run #62950

✅ Baseline matches: this diff contains only this PR's changes.

Path Size % Change Change
@sentry/browser 29.91 kB - -
@sentry/browser - with treeshaking flags 28.05 kB - -
@sentry/browser - with treeshaking flags tracing without tracing 27.95 kB - -
@sentry/browser (incl. Tracing) 52.1 kB - -
@sentry/browser (incl. Tracing + Span Streaming) 52.1 kB - -
@sentry/browser (incl. Tracing, Profiling) 55.05 kB - -
@sentry/browser (incl. Tracing, Replay) 91.85 kB - -
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 80.72 kB - -
@sentry/browser (incl. Tracing, Replay with Canvas) 96.58 kB - -
@sentry/browser (incl. Tracing, Replay, Feedback) 109.52 kB - -
@sentry/browser (incl. Feedback) 47.42 kB - -
@sentry/browser (incl. sendFeedback) 34.97 kB - -
@sentry/browser (incl. FeedbackAsync) 40.07 kB - -
@sentry/browser (incl. Metrics) 30.93 kB - -
@sentry/browser (incl. Logs) 31.21 kB - -
@sentry/browser (incl. Metrics & Logs) 31.84 kB - -
@sentry/react 31.74 kB - -
@sentry/react (incl. Tracing) 54.42 kB - -
@sentry/vue 38.07 kB - -
@sentry/vue (incl. Tracing) 55.03 kB - -
@sentry/svelte 29.93 kB - -
@sentry/remix (Remix 3 client bundle) 57.11 kB - -
CDN Bundle 31.67 kB - -
CDN Bundle (incl. Tracing) 52.61 kB - -
CDN Bundle (incl. Logs, Metrics) 33.87 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) 54.55 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) 74.79 kB - -
CDN Bundle (incl. Tracing, Replay) 90.28 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 92.21 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) 96.42 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 98.37 kB - -
CDN Bundle - uncompressed 93.29 kB - -
CDN Bundle (incl. Tracing) - uncompressed 156.14 kB - -
CDN Bundle (incl. Logs, Metrics) - uncompressed 99.84 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 162.11 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 229.88 kB - -
CDN Bundle (incl. Tracing, Replay) - uncompressed 276.31 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 282.26 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 290.01 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 295.96 kB - -
@sentry/nextjs (client) 57.31 kB - -
@sentry/sveltekit (client) 52.48 kB - -
@sentry/core/server 41.8 kB - -
@sentry/core/browser 13.81 kB - -
@sentry/node 152.6 kB -0.02% -23 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection) 81.58 kB - -
@sentry/node - without tracing 94.23 kB -0.03% -22 B 🔽
@sentry/node - without channel injection 133.27 kB -0.03% -30 B 🔽
@sentry/aws-serverless 102.41 kB -0.03% -23 B 🔽
@sentry/cloudflare (withSentry) - minified 211.11 kB - -
@sentry/cloudflare (withSentry) 523.83 kB - -
@sentry/nextjs/cloudflare (withSentry) - minified 230.74 kB - -

View base workflow run

@JPeer264 JPeer264 left a comment •

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LGTM.

You think it would make sense to add an integration test for it? Also, you think this would happen in Bun & Deno too?

@logaretm
logaretm force-pushed the awad/span-buffer-before-exit-flush branch from 0dc8546 to 1f7fb22 Compare October 20, 2026 13:14

@Lms24 Lms24 left a comment

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thanks for fixing. Had a question though


// The span buffer's timers are unref'd, so a natural exit would drop its spans.
this._spanOnExitFlushListener = () => {
this.emit('flush');

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If we emit flush here, do we even still need the _INTERNAL_flushLogsBuffer and _INTERNAL_flushMetricsBuffer above? The two buffers also listen to client.on('flush')

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I think we can merge all of them into one beforeExist listener.

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Is this what u had in mind? 3fbf054

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yes, exactly, thanks for changing!

@logaretm
logaretm requested a review from Lms24 October 20, 2026 14:10
@logaretm
logaretm force-pushed the awad/span-buffer-before-exit-flush branch from fa95485 to 0ea3626 Compare October 21, 2026 15:10

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Successfully merging this pull request may close these issues.

Span streaming (default in v11) loses all buffered spans when the Node process exits on its own

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