docs(nextjs): added guide for Cloudlfare OpenNext support

[logaretm]

I won't merge this yet as it partially needs getsentry/sentry-javascript#18336 to be released, but I wanted some initial opinions.

This PR adds new information about supporting Next.js deployments on Cloudflare Workers via Cloudflare's official OpenNext adapter.

During my investigation of Cloudflare Workers not sending any errors or traces for Next.js apps, I found out that it was because Cloudflare workers didn't support https.request module until recently which would've prevented the SDK from sending anything. Setting the compat date alone fixes most of the sending issues.

So I wanted to document this information so users are able to find it more easily.

My findings can be verified by checking out this repo and try setting the compat date to anything below August 16th. You don't need a cloudflare account, just wranger dev should give you a similar environment locally to verify that.

---

Question for reviewers: Should this live in special guides like I did here? or maybe add it to the manual setup?

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
sentry-docs	Ready	Preview	Comment	Dec 2, 2025 1:52pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
develop-docs	Ignored	Preview		Dec 2, 2025 1:52pm

[codecov]

Bundle Report

Changes will increase total bundle size by 53.93kB (0.15%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	24.85MB	53.93kB (0.22%) ⬆️
sentry-docs-client-array-push	10.22MB	-6 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

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

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	5.5MB	-0.0%
6529.js	-3 bytes	4.92MB	-0.0%
../instrumentation.js	-3 bytes	4.82MB	-0.0%
../app/[[...path]]/page.js.nft.json	17.98kB	1.08MB	1.69%
../app/platform-redirect/page.js.nft.json	17.98kB	1.08MB	1.69%
../app/sitemap.xml/route.js.nft.json	17.98kB	1.08MB	1.7%

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	893.1kB	-0.0%
static/chunks/9366-*.js	-3 bytes	436.99kB	-0.0%
server/middleware-*.js	6.46kB	7.46kB	645.5% ⚠️
server/middleware-*.js	-6.46kB	1.0kB	-86.59%
static/td9sZNUUKk6XDqFdO_yxF/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/td9sZNUUKk6XDqFdO_yxF/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/nqm6A74xPzr4rwqrvKq8e/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/nqm6A74xPzr4rwqrvKq8e/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

[inventarSarah]

Yes, I think it makes sense to set up a separate page for this. Ideally, our quick start guides shouldn't contain any information that can't be found elsewhere, so I think your approach is a good one.

Overall, I think the page looks great 👍. Please add a little more information so that users understand why they need to do this (see my comments).

[logaretm]

Many thanks for the review, I updated the page with your suggestions.

[inventarSarah]

thanks for the update -- looks good to me! 🌟

[logaretm]

Release 10.28.0 was tagged with the flushing mechanism needed, merging this now.