⚗️ Add Nuxt plugin with router tracking

[BeltranBulbarellaDD]

Motivation

Add a first-party Nuxt integration for Browser RUM so Nuxt applications can plug into Datadog RUM with Nuxt-aware view tracking. This also gives us stable view names for Nuxt router templates instead of grouping views by concrete URLs.

Changes

• Add a new @datadog/browser-rum-nuxt package with a nuxtRumPlugin(router) helper.
• Configure the plugin to use manual view tracking and start RUM views from Nuxt router navigations.
• Normalize Nuxt dynamic and catch-all routes into stable view names such as /user/[id] and /guides/[...slug].
• Avoid creating extra views for failed navigations or same-path navigations that only change query params or hashes.
• Add unit coverage for the Nuxt plugin and router view-name/tracking behavior.
• Add a dedicated Nuxt test app plus Playwright coverage, and wire the Nuxt app into the E2E/build harness

Test instructions

• yarn test:unit --spec packages/rum-nuxt/src/domain/nuxtPlugin.spec.ts
• yarn test:unit --spec packages/rum-nuxt/src/domain/router/nuxtRouter.spec.ts
• yarn build:apps --app nuxt-app
• yarn test:e2e -g "nuxt - router"

Also can go into the nuxt test app package and use the developer extension to see events manually.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	178.55 KiB	178.55 KiB	0 B	0.00%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	26.97 KiB	26.97 KiB	0 B	0.00%	✅
Logs	57.00 KiB	57.00 KiB	0 B	0.00%	✅
Rum Slim	134.31 KiB	134.31 KiB	0 B	0.00%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0076	0.0071	-6.58%
RUM - add action	0.0268	0.0224	-16.42%
RUM - add error	0.0243	0.0209	-13.99%
RUM - add timing	0.0049	0.0046	-6.12%
RUM - start view	0.0222	0.0213	-4.05%
RUM - start/stop session replay recording	0.0011	0.0012	+9.09%
Logs - log message	0.0189	0.0269	+42.33%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	27.16 KiB	27.16 KiB	+4 B
RUM - add action	96.25 KiB	101.86 KiB	+5.61 KiB
RUM - add timing	27.20 KiB	26.24 KiB	-980 B
RUM - add error	90.19 KiB	92.14 KiB	+1.95 KiB
RUM - start/stop session replay recording	25.41 KiB	25.86 KiB	+463 B
RUM - start view	482.05 KiB	477.33 KiB	-4.72 KiB
Logs - log message	88.43 KiB	100.41 KiB	+11.98 KiB

🔗 RealWorld

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 68.42%
• Overall Coverage: 77.25% (-0.04%)

_{This comment will be updated automatically if new data arrives.
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[BeltranBulbarellaDD]

@codex pls review

[chatgpt-codex-connector]

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[BeltranBulbarellaDD]

@codex pls review

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[BeltranBulbarellaDD]

@codex pls review

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