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fix(replay): Move error sampling to before send #8057

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billyvg
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@billyvg billyvg commented May 5, 2023

In buffer mode, we were always tagging error events even if it was not sampled. This is because the sampling decision was moved from the initialization of the SDK to much further down the pipeline to right before flushing a replay. We now handle sampling of the error event before tagging event with replayId, and in the afterSend callback, we consider an error event as sampled if it has a replayId.

Closes #8055

@billyvg billyvg changed the title fix replay sampling happens too late incorrect tagging fix(replay): Move error sampling to before send May 5, 2023
@billyvg billyvg requested a review from mydea May 5, 2023 21:34
@billyvg billyvg marked this pull request as ready for review May 5, 2023 21:34
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github-actions bot commented May 5, 2023

size-limit report 📦

Path Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified) 21.02 KB (0%)
@sentry/browser - ES5 CDN Bundle (minified) 65.62 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified) 19.55 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified) 58.08 KB (0%)
@sentry/browser - Webpack (gzipped + minified) 21.16 KB (0%)
@sentry/browser - Webpack (minified) 69.03 KB (0%)
@sentry/react - Webpack (gzipped + minified) 21.18 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified) 49.09 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified) 28.64 KB (0%)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified) 26.86 KB (-0.01% 🔽)
@sentry/replay ES6 CDN Bundle (gzipped + minified) 47.16 KB (+0.55% 🔺)
@sentry/replay - Webpack (gzipped + minified) 40.94 KB (+0.56% 🔺)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified) 66.1 KB (+0.47% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified) 58.99 KB (+0.52% 🔺)

billyvg added 4 commits May 5, 2023 18:32
In buffer mode, we were always tagging error events even if it was not sampled. This is because the sampling decision was moved from the initialization of the SDK to much further down the pipeline to right before flushing a replay. We now handle sampling of the error event before tagging event with replayId, and in the afterSend callback, we consider an error event as sampled if it has a replayId.
@billyvg billyvg force-pushed the fix-replay-sampling-happens-too-late-incorrect-tagging branch from 9d724a3 to 1319822 Compare May 5, 2023 22:38
return;
}

if (replay.recordingMode === 'buffer' && event.tags && event.tags.replayId) {
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I love this, much clearer than before! 🎉

@mydea
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mydea commented May 8, 2023

I was so free to do a very minor refactor (I combined shouldTrySampleEvent() && isSampled() into shouldSampleForBufferEvent(), as I was initially a bit confused by this). Will merge this and include in the next release! 🚀

@mydea mydea merged commit d8cf8d3 into develop May 8, 2023
@mydea mydea deleted the fix-replay-sampling-happens-too-late-incorrect-tagging branch May 8, 2023 08:20
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Replay: Events tagged with replay_id before sampling decision
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