⚗ [RUM-11393] Add Start/StopResource API #4110

BeltranBulbarellaDD · 2026-01-22T09:55:02Z

Motivation

Discussed in this RFC

Following the same pattern as for start/stopAction, this PR introduces a manual resource tracking API.

Since start/stopAction and start/stopResource follow similar patterns, created eventTracker the idea is to reuse it for all events which have start/stop logic.

Changes

New Experimental Feature

Added START_STOP_RESOURCE feature flag

New Public APIs

Added startResource(url, options?) and stopResource(url, options?) to RumPublicApi

Architecture Refactoring

Extracted eventTracker: Shared utility for managing start/stop lifecycle (used by both actions and resources)
Refactored trackManualActions.ts to use the shared utility
Added trackManualResources.ts for manual resource lifecycle
Removed trackAction as it is now replaced by eventTracker

Test instructions

I used this HTML file to test locally.

Example Resource

Example in Flutter web.

Checklist

Tested locally
Tested on staging
Added unit tests for this change.
Added e2e/integration tests for this change.

cit-pr-commenter-54b7da · 2026-01-22T10:12:19Z

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	167.98 KiB	169.86 KiB	+1.89 KiB	+1.12%	✅
Rum Profiler	4.31 KiB	4.31 KiB	+1 B	+0.02%	✅
Rum Recorder	24.54 KiB	24.54 KiB	+1 B	+0.00%	✅
Logs	56.25 KiB	56.29 KiB	+44 B	+0.08%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	124.88 KiB	126.65 KiB	+1.78 KiB	+1.42%	✅
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	0.0039	0.0046	+17.95%
RUM - add action	0.0129	0.015	+16.28%
RUM - add error	0.0133	0.0156	+17.29%
RUM - add timing	0.0026	0.0026	0.00%
RUM - start view	0.0031	0.003	-3.23%
RUM - start/stop session replay recording	0.0007	0.0006	-14.29%
Logs - log message	0.0176	0.0142	-19.32%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	28.70 KiB	26.65 KiB	-2.04 KiB
RUM - add action	100.44 KiB	51.09 KiB	-49.34 KiB
RUM - add timing	27.83 KiB	26.99 KiB	-860 B
RUM - add error	102.86 KiB	54.92 KiB	-47.94 KiB
RUM - start/stop session replay recording	26.75 KiB	26.85 KiB	+109 B
RUM - start view	438.38 KiB	430.18 KiB	-8.20 KiB
Logs - log message	48.20 KiB	47.75 KiB	-461 B

🔗 RealWorld

datadog-official · 2026-01-22T10:15:41Z

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 73.74%
• Overall Coverage: 77.08%

View detailed report

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

🔗 Commit SHA: 7c4a484 | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

BeltranBulbarellaDD · 2026-01-23T10:06:08Z

@codex pls review.

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packages/rum-core/src/domain/resource/trackManualResources.ts

packages/rum-core/src/domain/manualEventLifecycle.ts

packages/rum-core/src/domain/resource/trackManualResources.ts

…le to manualEventRegistry, refactor manualEventRegistry.

BeltranBulbarellaDD · 2026-01-27T08:52:04Z

@codex pls review

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packages/rum-core/src/domain/resource/trackManualResources.ts

…which merges eventRegistry and actionTracker.

BeltranBulbarellaDD · 2026-01-29T15:19:16Z

@codex can you pls review?

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packages/rum-core/src/domain/resource/trackManualResources.ts

…iscard. Switched to makeRumPublicApiWithDefaults which has built-in cleanup in startResource / stopResource

BeltranBulbarellaDD · 2026-01-29T15:44:13Z

@codex pls review now?

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packages/rum-core/src/domain/resource/trackManualResources.ts

BeltranBulbarellaDD · 2026-01-30T08:53:39Z

@codex pls review

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packages/rum-core/src/domain/resource/trackManualResources.ts

BeltranBulbarellaDD · 2026-01-30T12:59:03Z

@codex pls review

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packages/rum-core/src/domain/action/trackClickActions.ts

BeltranBulbarellaDD · 2026-01-30T13:29:06Z

@codex pls review

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packages/rum-core/src/domain/resource/trackManualResources.ts

packages/rum-core/src/domain/action/computeFrustration.ts

packages/rum-core/src/domain/action/trackClickActions.ts

packages/rum-core/src/domain/action/trackManualActions.ts

packages/rum-core/src/domain/eventTracker.ts

BenoitZugmeyer · 2026-02-02T14:35:37Z

packages/rum-core/src/domain/resource/trackManualResources.ts

+  }
+
+  function startManualResource(url: string, options: ResourceOptions = {}, startClocks = clocksNow()) {
+    if (!isAllowedRequestUrl(url)) {


suggestion: this is probably unnecessary

I added it because of this Codex Review.

packages/rum-core/src/domain/resource/trackManualResources.ts

BeltranBulbarellaDD · 2026-02-03T15:47:38Z

@codex pls review

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packages/rum-core/src/boot/rumPublicApi.ts

BeltranBulbarellaDD added 2 commits January 22, 2026 10:51

refactor manual tracking, add s/s resource

a49b4e9

Fix format and lint

40945d9

BeltranBulbarellaDD changed the title ~~refactor manual tracking, add s/s resource~~ ⚗ [RUM-11393] Add Start/StopResource API Jan 22, 2026

BeltranBulbarellaDD added 2 commits January 22, 2026 12:01

Remove stopResourceWithError

aeae65f

Add e2e test, merge unit tests, add telemetry

998c7a9

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packages/rum-core/src/domain/resource/trackManualResources.ts Outdated Show resolved Hide resolved

BeltranBulbarellaDD commented Jan 23, 2026

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packages/rum-core/src/domain/manualEventLifecycle.ts Outdated Show resolved Hide resolved

Prevent event.resource.type access for manual resources

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BenoitZugmeyer reviewed Jan 26, 2026

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BeltranBulbarellaDD added 3 commits January 26, 2026 13:50

Merge branch 'main' into beltran.bulbarella/start-stopResource

e4a5a36

Add optional fields to RawRumResourceEvent, rename manualEventLifecyc…

684d9dc

…le to manualEventRegistry, refactor manualEventRegistry.

Remove unneded check because of combine.

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packages/rum-core/src/domain/resource/trackManualResources.ts Outdated Show resolved Hide resolved

BeltranBulbarellaDD added 5 commits January 27, 2026 10:19

Fix sanitizeIfLongDataUrl in trackManualResources

65d9f8b

Remove duplicate tests to use manualEventRegistry

0dd0466

Merge branch 'main' into beltran.bulbarella/start-stopResource

e16e523

Refactored action and resource tracking to use the new event tracker …

144b1ec

…which merges eventRegistry and actionTracker.

Merge branch 'main' into beltran.bulbarella/start-stopResource

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packages/rum-core/src/domain/resource/trackManualResources.ts Outdated Show resolved Hide resolved

Updated eventTracker.ts to pass startClocks as third parameter to onD…

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…iscard. Switched to makeRumPublicApiWithDefaults which has built-in cleanup in startResource / stopResource

chatgpt-codex-connector bot reviewed Jan 29, 2026

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Don't allow resources to be started with undefined URL.

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packages/rum-core/src/domain/resource/trackManualResources.ts Outdated Show resolved Hide resolved

Filter out intake requests in manual resource tracking

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packages/rum-core/src/domain/action/trackClickActions.ts Outdated Show resolved Hide resolved

Add stopObservable.notify() in the discard() method

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Simplify activityEndTime checks

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BeltranBulbarellaDD marked this pull request as ready for review February 2, 2026 14:01

BeltranBulbarellaDD requested a review from a team as a code owner February 2, 2026 14:01

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BeltranBulbarellaDD added 3 commits February 3, 2026 15:19

Simplify and remove unnecessary code.

a1e6d11

Return getCounts in eventTracker. Rollback hasPageActivity.

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Merge branch 'main' into beltran.bulbarella/start-stopResource

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Make name required in ActionEventData.

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⚗ [RUM-11393] Add Start/StopResource API #4110

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⚗ [RUM-11393] Add Start/StopResource API #4110

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Motivation

Changes

Test instructions

Checklist

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Bundles Sizes Evolution

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BeltranBulbarellaDD commented Jan 22, 2026 •

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