feat(native): transactions as automatic trace boundaries

[supervacuus]

This PR adds documentation for the behavior introduced in getsentry/sentry-native#1270.

This PR should be merged/deployed after the Native SDK release 0.10.0.

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 8, 2025 9:37am

1 Skipped Deployment

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[codecov]

Bundle Report

Changes will increase total bundle size by 570 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	9.85MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	12.37MB	576 bytes (0.0%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
static/chunks/pages/_app-*.js	-3 bytes	882.71kB	-0.0%
static/chunks/8321-*.js	-3 bytes	425.87kB	-0.0%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
static/IRPidyVEt7bkSPCLL1yyL/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/IRPidyVEt7bkSPCLL1yyL/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/9rWfUVDgm8OYQEgCqpNwb/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/9rWfUVDgm8OYQEgCqpNwb/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

view changes for bundle: sentry-docs-server-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.77MB	-0.0%
../instrumentation.js	-3 bytes	1.1MB	-0.0%
9523.js	-3 bytes	1.08MB	-0.0%
../app/[[...path]]/page.js.nft.json	195 bytes	743.84kB	0.03%
../app/platform-redirect/page.js.nft.json	195 bytes	743.76kB	0.03%
../app/sitemap.xml/route.js.nft.json	195 bytes	741.23kB	0.03%

[JoshuaMoelans]

Almost LGTM, just needs removal of some leftover mentions of the default propagation_context applying to transactions/spans too.

[JoshuaMoelans]

LGTM 🚀