docs(tracing): mention posthog-node on the tracing docs landing page

[turnipdabeets]

Changes

Follow-up to #19837, which documented posthog-node's span API (shipped in posthog-node 5.52.0) on the Node library page and the tracing install guides, but missed the /docs/distributed-tracing landing page. That page still told readers they "don't need any vendor-specific SDKs" and described OpenTelemetry as the only route.

• Overview – keeps the OpenTelemetry route first, and adds that on Node.js posthog-node can create and export spans itself, linking the Node.js guide. Same framing installation/index.mdx already uses.
• Why use – the OpenTelemetry-compatible bullet also names posthog-node's span API.

Out of scope, flagged for owners:

• #19930 (draft) edits the same file's ReaderView wrapper – different hunks, no conflict expected.
• src/hooks/productData/traces.tsx (product page) says "Built on OpenTelemetry: no proprietary SDK". Marketing copy, and Rework Tracing product page according to shared template, list in product navigation, move it to /tracing #19930 rewrites that file, so it's left alone here.

Companion: PostHog/posthog#99441 fixes the same claim in the in-app tracing empty state; PostHog/context-mill#391 adds the agent-facing tracing skill that reads these pages.

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 (no pages moved)

🤖 Generated with Claude Code

https://claude.ai/code/session_01QPLdjqTgK93WtVxnhx6aVr

[github-actions]

Deploy preview

Status	Details	Updated (UTC)
🟢 Ready	View preview	Sep 11, 2026 05:56PM

[github-actions]

Bundle report

Total JS (gzip)

8.87 MiB (+0.6 KiB / +0.0%)

Eager graph (modules shipped in each entrypoint's initial chunks)

Entrypoint	Eager size	Budget	Modules
✅ app	18.50 MiB (+4.3 KiB / +0.0%)	report-only	2058

Largest modules in the app closure

Module	Size
./src/data/mcp-tools.json	1130.1 KiB
css ./node_modules/.pnpm/css-loader@5.2.7_webpack@5.101.3/node_modules/css-loader/dist/cjs.js??ruleSet[1].rules[8].oneOf[1].use[1]!./node_modules/.pnpm/postcss-loader@4.3.0_postcss@8.5.6_webpack@5.101.3/node_modules/postcss-loader/dist/cjs.js??ruleSet[1].rules[8].oneOf[1].use[2]!./src/styles/global.css	762.5 KiB
./src/components/Stickers/Stickers.tsx	696.4 KiB
./node_modules/.pnpm/@radix-ui+react-icons@1.3.2_react@18.3.1/node_modules/@radix-ui/react-icons/dist/react-icons.esm.js	481.4 KiB
./node_modules/.pnpm/@posthog+brand@0.8.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/x-ray.mjs	480.8 KiB
./node_modules/.pnpm/rehype-raw@7.0.0/node_modules/rehype-raw/lib/index.js + 29 modules	395.1 KiB
./node_modules/.pnpm/@posthog+brand@0.8.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/im-the-driver.mjs	385.7 KiB
./src/hooks/useCustomers.tsx + 55 modules	370.0 KiB
./node_modules/.pnpm/@posthog+icons@0.36.6_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js	354.8 KiB
./node_modules/.pnpm/react-markdown@8.0.7_@types+react@16.14.66_react@18.3.1/node_modules/react-markdown/lib/react-markdown.js + 88 modules	351.4 KiB
./src/components/ProductComparisonTable/index.tsx + 126 modules	305.7 KiB
./node_modules/.pnpm/cloudinary-core@2.14.0_lodash@4.17.21/node_modules/cloudinary-core/cloudinary-core.js	281.9 KiB
./node_modules/.pnpm/@posthog+brand@0.8.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/doll-house.mjs	281.7 KiB
./node_modules/.pnpm/@posthog+brand@0.8.0_react@18.3.1/node_modules/@posthog/brand/dist/generated/hoggies/svg/director.mjs	275.6 KiB
./src/components/SearchUI/index.tsx + 87 modules	273.7 KiB

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Eager-graph budgets are report-only until a baseline is established. Sizes are gzip of public/**/*.js; eager size is webpack module source bytes for the modules actually shipped in the entrypoint's initial chunks (post-tree-shake).