[PROF-13798] [Browser Profiler] Quota check

[thomasbertet]

Motivation

Adds client-side enforcement of the per-org profiling quota by calling the quota admission API before allowing profiling data to be sent. Ticket: PROF-13798.

Changes

• New quotaCheck.ts: calls GET /api/unstable/profiling/admission?session_id=<id>&dd-api-key=<token>. Returns 'quota-ok' (HTTP 200, timeout, network error — fail-open) or 'quota-exceeded' (HTTP 429). 5 s client-side timeout via AbortController + Promise.race. Uses the Zone.js-safe fetch wrapper from @datadog/browser-core.
• profiler.ts: profiler starts recording immediately (optimistic), quota check fires in parallel. On quota-exceeded: profiler stops, trace is discarded (no data sent), _dd.profiling.error_reason is set to 'quota-exceeded' on RUM events. A generation counter prevents stale results from a prior session applying to a new one. SESSION_RENEWED now also restarts on quota-exceeded so quota is re-checked on session renewal.
• rumProfiler.types.ts: adds 'quota-exceeded' to RumProfilerStoppedInstance.stateReason.

Temporary Note: _dd.profiling.error_reason: 'quota-exceeded' is passed with as any until the rum-events-format schema is updated in a rum-events-format PR.

Test instructions

• Unit tests: yarn test:unit --spec packages/rum/src/domain/profiling/quotaCheck.spec.ts (5 tests)
• Unit tests: yarn test:unit --spec packages/rum/src/domain/profiling/profiler.spec.ts (25 tests, includes 8 new quota check scenarios)
• Verify _dd.profiling.error_reason: 'quota-exceeded' appears on RUM events when the quota API returns 429

Checklist

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

[datadog-prod-us1-4]

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

🧪 13 Tests failed

checkProfilingQuota builds the URL with site and session_id from Chrome 63.0.3239.84 (Windows 10)     (Fix with Cursor)

ReferenceError: AbortController is not defined
    at checkProfilingQuota (webpack:///packages/rum/src/domain/profiling/quotaCheck.ts:19:22 <- /tmp/_karma_webpack_321698/commons.js:111848:24)
    at UserContext.it (webpack:///packages/rum/src/domain/profiling/quotaCheck.spec.ts:52:30 <- /tmp/_karma_webpack_321698/commons.js:111811:79)
    at <Jasmine>

checkProfilingQuota returns quota-exceeded on HTTP 429 from Chrome 63.0.3239.84 (Windows 10)     (Fix with Cursor)

ReferenceError: AbortController is not defined
    at checkProfilingQuota (webpack:///packages/rum/src/domain/profiling/quotaCheck.ts:19:22 <- /tmp/_karma_webpack_321698/commons.js:111848:24)
    at UserContext.it (webpack:///packages/rum/src/domain/profiling/quotaCheck.spec.ts:28:45 <- /tmp/_karma_webpack_321698/commons.js:111790:94)
    at <Jasmine>

checkProfilingQuota returns quota-ok on HTTP 200 from Chrome 63.0.3239.84 (Windows 10)     (Fix with Cursor)

ReferenceError: AbortController is not defined
    at checkProfilingQuota (webpack:///packages/rum/src/domain/profiling/quotaCheck.ts:19:22 <- /tmp/_karma_webpack_321698/commons.js:111848:24)
    at UserContext.it (webpack:///packages/rum/src/domain/profiling/quotaCheck.spec.ts:20:45 <- /tmp/_karma_webpack_321698/commons.js:111783:94)
    at <Jasmine>

View all

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 75.00%
• Overall Coverage: 77.01% (-0.03%)

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[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	179.16 KiB	179.19 KiB	+26 B	+0.01%	✅
Rum Profiler	6.16 KiB	7.09 KiB	+957 B	+15.18%	✅
Rum Recorder	27.03 KiB	27.03 KiB	0 B	0.00%	✅
Logs	56.65 KiB	56.67 KiB	+26 B	+0.04%	✅
Rum Slim	135.00 KiB	135.03 KiB	+26 B	+0.02%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Pending...

🧠 Memory Performance

Pending...

🔗 RealWorld