[WIP] feat: Span Streaming POC

[Lms24]

This PR contains the POC span streaming implementation for browser SDKs.

Can be tested on @sentry/[email protected] and any higher-level SDKs.

To opt into span streaming, set:

Sentry.init({
  dsn: '...',
  tracesSampleRate: 1,
  traceLifecycle: 'stream', <-- 
  integrations: [
    Sentry.browserTracingIntegration();
    Sentry.spanStreamingIntegration(); <-- 
  ],

  // if you use beforeSendSpan, you have to opt into the new serialized span format:
  beforeSendSpan: withStreamSpan(serializedSpan => {
     // do something
     return serializedSpan
   }),
})

Also note that spans will no longer be sent to any event processors added via one if the *.addEventProcessor APIs. If you have any event processors, consider using beforeSendSpan or ignoreSpans.

[github-actions]

size-limit report 📦

⚠️ Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Path	Size	% Change	Change
@sentry/browser	25.76 kB	+3.7%	+917 B 🔺
@sentry/browser - with treeshaking flags	24.3 kB	+4.1%	+956 B 🔺
@sentry/browser (incl. Tracing)	42.73 kB	+2.74%	+1.14 kB 🔺
@sentry/browser (incl. Tracing, Profiling)	47.31 kB	+2.46%	+1.13 kB 🔺
@sentry/browser (incl. Tracing, Replay)	81.41 kB	+1.56%	+1.25 kB 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	71.01 kB	+1.59%	+1.11 kB 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	86.09 kB	+1.48%	+1.25 kB 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	98.28 kB	+1.22%	+1.18 kB 🔺
@sentry/browser (incl. Feedback)	42.47 kB	+2.17%	+901 B 🔺
@sentry/browser (incl. sendFeedback)	30.42 kB	+3.03%	+894 B 🔺
@sentry/browser (incl. FeedbackAsync)	35.44 kB	+2.63%	+907 B 🔺
@sentry/browser (incl. Metrics)	26.67 kB	+2.89%	+747 B 🔺
@sentry/browser (incl. Logs)	26.83 kB	+2.89%	+752 B 🔺
@sentry/browser (incl. Metrics & Logs)	27.47 kB	+2.76%	+737 B 🔺
@sentry/react	27.5 kB	+3.47%	+920 B 🔺
@sentry/react (incl. Tracing)	45 kB	+2.71%	+1.19 kB 🔺
@sentry/vue	30.42 kB	+3.8%	+1.11 kB 🔺
@sentry/vue (incl. Tracing)	44.55 kB	+2.65%	+1.15 kB 🔺
@sentry/svelte	25.78 kB	+3.72%	+923 B 🔺
CDN Bundle	28.08 kB	+2.6%	+710 B 🔺
CDN Bundle (incl. Tracing)	43.31 kB	+2.27%	+958 B 🔺
CDN Bundle (incl. Tracing, Replay)	79.99 kB	+1.19%	+933 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	85.47 kB	+1.14%	+957 B 🔺
CDN Bundle - uncompressed	82.23 kB	+2.4%	+1.92 kB 🔺
CDN Bundle (incl. Tracing) - uncompressed	128.37 kB	+2.13%	+2.67 kB 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	244.9 kB	+1.11%	+2.67 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	257.69 kB	+1.05%	+2.68 kB 🔺
@sentry/nextjs (client)	47.36 kB	+2.58%	+1.19 kB 🔺
@sentry/sveltekit (client)	43.15 kB	+2.84%	+1.19 kB 🔺
@sentry/node-core	52.5 kB	+1.53%	+790 B 🔺
@sentry/node	164.79 kB	+1.75%	+2.83 kB 🔺
@sentry/node - without tracing	96.03 kB	+3.11%	+2.89 kB 🔺
@sentry/aws-serverless	111.31 kB	+2.45%	+2.66 kB 🔺

View base workflow run

[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
⚠️ Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	8,445	-	8,658	-2%
GET With Sentry	1,326	16%	1,668	-21%
GET With Sentry (error only)	5,823	69%	5,968	-2%
POST Baseline	1,161	-	1,118	+4%
POST With Sentry	502	43%	546	-8%
POST With Sentry (error only)	1,024	88%	999	+3%
MYSQL Baseline	3,240	-	3,182	+2%
MYSQL With Sentry	405	13%	388	+4%
MYSQL With Sentry (error only)	2,610	81%	2,581	+1%

View base workflow run