docs(logs): Add installation guide for Next.js logs integration

[jonmcwest]

Changes

Added a new documentation page for Next.js logs installation. The guide provides step-by-step instructions for:

• Installing required OpenTelemetry packages
• Getting the project API key
• Enabling instrumentation in Next.js
• Creating the instrumentation file
• Using OpenTelemetry logging in server-side code
• Testing the setup

The documentation includes code examples for each step and important notes about runtime considerations.

Checklist

• I've read the docs and/or content style guides.
• Words are spelled using American English
• Use relative URLs for internal links
• I've checked the pages added or changed in the Vercel preview build
• If I moved a page, I added a redirect in vercel.json

[vercel]

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Project	Deployment	Review	Updated (UTC)
posthog	Ready	Preview	Jan 28, 2026 7:08pm

[jonmcwest]

• docs(logs): Add installation guide for Next.js logs integration #14614 👈 (View in Graphite)
• master

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[corywatilo]

Missing Next.js link in nav

[corywatilo]

I'd probably but this callout above the code since it's more likely to copy in, then continue reading like I did, vs knowing I can skip had I read it first?

[jonmcwest]

I'd probably but this callout above the code since it's more likely to copy in, then continue reading like I did, vs knowing I can skip had I read it first?

Resolved in #14616