♻️ Route fetch, XHR, and console through bufferedDataObservable

[thomas-lebeau]

Motivation

Centralize the buffering of fetch, XHR, and console observables into bufferedDataObservable instead of each observable managing its own buffer. This simplifies the pre-start data flow and removes the need for early instrumentation (subscribe(noop)) and product-specific wrappers like trackConsoleError.

Changes

• Add FETCH, XHR, and CONSOLE types to the BufferedData discriminated union with a consistent { type, data } shape
• Subscribe to fetch/xhr/console observables in startBufferingData() so buffering is centralized
• Update Logs and RUM consumers to receive network and console events via bufferedDataObservable instead of subscribing directly to each observable
• Convert fetchObservable/xhrObservable/consoleObservable from BufferedObservable to plain Observable (buffering now centralized)
• Remove early instrumentation (subscribe(noop)) from pre-start phases
• Remove trackConsoleError (replaced by console handling in errorCollection)

Test instructions

• Run yarn test:unit to verify all unit tests pass
• Verify that fetch, XHR, and console errors are still collected correctly during pre-start and post-start phases

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	166.98 KiB	167.23 KiB	+251 B	+0.15%	✅
Rum Profiler	6.09 KiB	6.09 KiB	0 B	0.00%	✅
Rum Recorder	27.10 KiB	27.10 KiB	0 B	0.00%	✅
Logs	53.76 KiB	53.78 KiB	+21 B	+0.04%	✅
Rum Slim	125.39 KiB	125.64 KiB	+255 B	+0.20%	✅
Worker	22.99 KiB	22.99 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0051	0.0044	-13.73%
RUM - add action	0.0194	0.0129	-33.51%
RUM - add error	0.0176	0.0124	-29.55%
RUM - add timing	0.0028	0.0025	-10.71%
RUM - start view	0.0146	0.0125	-14.38%
RUM - start/stop session replay recording	0.001	0.0007	-30.00%
Logs - log message	0.0161	0.0158	-1.86%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	33.47 KiB	33.73 KiB	+264 B
RUM - add action	246.93 KiB	121.33 KiB	-125.60 KiB
RUM - add timing	35.63 KiB	35.23 KiB	-416 B
RUM - add error	251.33 KiB	126.99 KiB	-124.35 KiB
RUM - start/stop session replay recording	35.75 KiB	35.90 KiB	+162 B
RUM - start view	614.86 KiB	531.89 KiB	-82.98 KiB
Logs - log message	244.74 KiB	49.23 KiB	-195.50 KiB

🔗 RealWorld

[datadog-datadog-prod-us1-2]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Other Violations

🧪 1 Test failed

microfrontend › RUM › with source code bundler plugin › xhr requests should have service and version from source code context from microfrontend.scenario.ts     (Fix with Cursor)

microfrontend.scenario.ts:314:17 xhr requests should have service and version from source code context

[Webkit] › microfrontend.scenario.ts:314:17 › microfrontend › RUM › with source code bundler plugin › xhr requests should have service and version from source code context 

    Error: expect(received).toMatchObject(expected)

    - Expected  - 10
    + Received  +  1

    - Array [
...

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 80.22%
• Overall Coverage: 78.15%

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