✨ Collect WebSocket resource events

[bdibon]

Motivation

Collect WebSocket connections and report them as RUM resource events, aggregating connection-level metrics.

Depends on the schema PR (#4716) and is kept in draft until it lands.

Changes

• Add webSocketCollection, which aggregates per-connection metrics from webSocketObservable and emits a WEBSOCKET_COMPLETED lifecycle event.
• Integrate into resourceCollection: assemble a websocket RumResourceEvent and skip websocket entries from the Resource Timing observer; add matchRequestResourceEntry.
• Wire startWebSocketCollection into startRum, gated by trackWebSockets + the TRACK_WEB_SOCKETS flag.
• Add Access-Control-Allow-Origin: * to the dev server to support local cross-origin WebSocket testing.

Test instructions

• yarn test:unit --spec packages/rum-core/src/domain/webSocketCollection.spec.ts
• yarn test:unit --spec packages/rum-core/src/domain/resource/resourceCollection.spec.ts

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

[bdibon]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• ✨ Collect WebSocket resource events #4718 👈 (View in Graphite)
• ✨ Add trackWebSockets configuration option (default: false) #4717
• 🔧 Sync rum-events-format with WebSocket resource schema #4716
• ✨ Add webSocketObservable for WebSocket lifecycle events #4715
• ✨ Add constructor support to instrumentMethod #4714
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[datadog-datadog-prod-us1-2]

 

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 4 Pipeline jobs failed

DataDog/browser-sdk | check-schemas     

See error

Untracked changes detected in telemetryEvent.types.ts. Please run 'yarn json-schemas:sync' or revert the rum-events-format submodule change.

DataDog/browser-sdk | unit-bs: [chrome-desktop]     

See error

HTTP Error 429: Rate limit exceeded for BrowserStack sessions.

DataDog/browser-sdk | unit-bs: [chrome-mobile]     

See error

Rate limit exceeded while trying to access BrowserStack, resulting in HTTP 429 error.

View all 4 failed jobs.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 83.75%
• Overall Coverage: 76.77% (+0.05%)

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Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	172.35 KiB	177.29 KiB	+4.94 KiB	+2.87%	✅
Rum Profiler	7.88 KiB	7.88 KiB	0 B	0.00%	✅
Rum Recorder	21.21 KiB	21.21 KiB	-1 B	-0.00%	✅
Logs	54.84 KiB	54.84 KiB	0 B	0.00%	✅
Rum Slim	130.26 KiB	135.04 KiB	+4.79 KiB	+3.67%	✅
Worker	22.96 KiB	22.96 KiB	0 B	0.00%	✅