Add new_trace to Python migration guide

[sentrivana]

We're adding new API in 3.x, documenting it in the migration guide.

Direct link to preview: https://sentry-docs-git-ivana-pythonnew-trace.sentry.dev/platforms/python/migration/2.x-to-3.x#tracing

IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs to go live.

• Urgent deadline (GA date, etc.):
• Other deadline:
• None: Not urgent, can wait up to 1 week+

SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

LEGAL BOILERPLATE

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

EXTRA RESOURCES

• Sentry Docs contributor guide

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	🛑 Canceled (Inspect)			Jul 30, 2025 9:15am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
develop-docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 30, 2025 9:15am

[codecov]

Bundle Report

Changes will increase total bundle size by 180 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	12.27MB	186 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	879.71kB	-0.0%
static/chunks/1831-*.js	-3 bytes	422.23kB	-0.0%
static/WARYdTBZ0A6880Q0hODFl/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/WARYdTBZ0A6880Q0hODFl/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/Xp-*.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/Xp-*.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	1.75MB	-0.0%
../instrumentation.js	-3 bytes	1.08MB	-0.0%
9523.js	-3 bytes	1.05MB	-0.0%
../app/[[...path]]/page.js.nft.json	65 bytes	732.0kB	0.01%
../app/platform-redirect/page.js.nft.json	65 bytes	731.91kB	0.01%
../app/sitemap.xml/route.js.nft.json	65 bytes	729.38kB	0.01%

[sentrivana]

Will merge as soon as an alpha is out with new_trace