streamGenAiSpans option prevents gen_ai span loss

Important Changes

• feat(core): Add streamGenAiSpans options to stream gen_ai spans (#20785)

  Adds a new streamGenAiSpans option that controls how gen_ai spans are sent to Sentry. When set, the SDK extracts all gen_ai spans out of a transaction and sends them as v2 envelope items.

  Enable this option if gen_ai spans are being dropped because the transaction payload exceeds size limits.

  Sentry.init({
    dsn: 'https://examplePublicKey@o0.ingest.sentry.io/0',
    streamGenAiSpans: true,
  });

Other Changes

• feat(browser): Migrate browser profiling thread data to span attributes (#20800)
• feat(core): Add addConsoleInstrumentationFilter utility (#20790)
• feat(core): Add applicationKey to BuildTimeOptionsBase (#20789)
• feat(core): split exports by browser/server for bundle size (#20435)
• feat(nextjs): Add top-level applicationKey option (#20794)
• feat(node): Support Node 26 (#20710)
• feat(profiling-node): Bump @sentry-internal/node-cpu-profiler to 2.4.0 (#20720)
• fix(cloudflare): avoid flush lock self-wait (#20719)
• fix(hono): Capture transaction name on request for correct culprit (#20801)
• fix(mcp): retroactively wrap handlers registered before wrapMcpServerWithSentry (#20699)
• fix(node-core): Guard against undefined util.getSystemErrorMap (#20660)
• fix(replay): Capture aborted/errored fetch requests in replay network tab (#20722)

<details> <summary> <strong>Internal Changes</strong> </summary>

• chore: bump replay dependencies (#20746)
• chore: Typo intergation -> integration (#20799)
• chore(deps): Bump @babel/plugin-transform-modules-systemjs from 7.24.1 to 7.29.4 (#20773)
• chore(deps): Bump next from 15.5.15 to 15.5.18 in /dev-packages/e2e-tests/test-applications/nextjs-15 (#20818)
• chore(deps): Bump next from 16.2.4 to 16.2.6 in /dev-packages/e2e-tests/test-applications/nextjs-16-streaming (#20811)
• chore(deps): Bump rollup from 4.59.0 to 4.60.3 (#20716)
• ci: Ensure PR reminder workflow considers new sub teams (#20814)
• ci: Remove codecov reporting (#20803)
• feat(deps): Bump bundler plugins to 5.3.0 (#20820)
• feat(deps): Bump fast-uri from 3.0.6 to 3.1.2 (#20774)
• feat(deps): Bump hono from 4.12.16 to 4.12.18 (#20777)
• test(cloudflare-hono): fix 'occured' -> 'occurred' typo in error log (#20783)
• test(deps): Bump hono from 4.12.14 to 4.12.16 (#20712)
• test(deps): Bump hono from 4.12.14 to 4.12.18 in /dev-packages/e2e-tests/test-applications/cloudflare-hono (#20776)
• test(e2e): Pin astro version in astro-6 test app (#20709)

</details>

Work in this release was contributed by @dmmulroy and @SAY-5. Thank you for your contributions!

Bundle size 📦

Path	Size
@sentry/browser	26.22 KB
@sentry/browser - with treeshaking flags	24.69 KB
@sentry/browser (incl. Tracing)	43.69 KB
@sentry/browser (incl. Tracing + Span Streaming)	45.63 KB
@sentry/browser (incl. Tracing, Profiling)	48.56 KB
@sentry/browser (incl. Tracing, Replay)	82.4 KB
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	72.08 KB
@sentry/browser (incl. Tracing, Replay with Canvas)	86.99 KB
@sentry/browser (incl. Tracing, Replay, Feedback)	99.33 KB
@sentry/browser (incl. Feedback)	43 KB
@sentry/browser (incl. sendFeedback)	30.92 KB
@sentry/browser (incl. FeedbackAsync)	35.91 KB
@sentry/browser (incl. Metrics)	27.27 KB
@sentry/browser (incl. Logs)	27.42 KB
@sentry/browser (incl. Metrics & Logs)	28.08 KB
@sentry/react	27.92 KB
@sentry/react (incl. Tracing)	45.91 KB
@sentry/vue	31.01 KB
@sentry/vue (incl. Tracing)	45.5 KB
@sentry/svelte	26.24 KB
CDN Bundle	28.55 KB
CDN Bundle (incl. Tracing)	46.05 KB
CDN Bundle (incl. Logs, Metrics)	29.89 KB
CDN Bundle (incl. Tracing, Logs, Metrics)	47.15 KB
CDN Bundle (incl. Replay, Logs, Metrics)	68.3 KB
CDN Bundle (incl. Tracing, Replay)	82.57 KB
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	83.62 KB
CDN Bundle (incl. Tracing, Replay, Feedback)	88.24 KB
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	89.32 KB
CDN Bundle - uncompressed	83.97 KB
CDN Bundle (incl. Tracing) - uncompressed	138.15 KB
CDN Bundle (incl. Logs, Metrics) - uncompressed	88.07 KB
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	141.53 KB
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	209.97 KB
CDN Bundle (incl. Tracing, Replay) - uncompressed	254.08 KB
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	257.44 KB
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	267.46 KB
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	270.81 KB
@sentry/nextjs (client)	48.36 KB
@sentry/sveltekit (client)	44.17 KB
@sentry/node-core	59.4 KB
@sentry/node	162.08 KB
@sentry/node - without tracing	72.22 KB
@sentry/aws-serverless	105.53 KB
@sentry/cloudflare (withSentry) - minified	166.66 KB
@sentry/cloudflare (withSentry)	420.38 KB