✨ feat: enable INP subparts collection by default

[HugoGarrido]

Motivation

This PR enables by default INP subparts collection without the need for any feature flag
The code has been introduced #4158
And the change is available behind a flag since v6.27.0 (release notes)

How to query in RUM

# Input Delay
@view.performance.inp.sub_parts.input_delay:*

# Presentation Delay
@view.performance.inp.sub_parts.presentation_delay:*

# Processing Duration
@view.performance.inp.sub_parts.processing_duration:* 

Changes

• Remove code gated behind ExperimentalFeature.INP_SUBPARTS
• INP subparts are now collected by default

Test instructions

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

[datadog-prod-us1-4]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.33% (+0.04%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 137f8cb | Docs | Datadog PR Page | Was this helpful? React with 👍/👎 or give us feedback!}

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	176.36 KiB	176.27 KiB	-95 B	-0.05%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	26.93 KiB	26.93 KiB	0 B	0.00%	✅
Logs	56.85 KiB	56.82 KiB	-30 B	-0.05%	✅
Rum Slim	132.13 KiB	132.05 KiB	-87 B	-0.06%	✅
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	0.0045	0.0043	-4.44%
RUM - add action	0.0128	0.0157	+22.66%
RUM - add error	0.0128	0.0136	+6.25%
RUM - add timing	0.0027	0.0029	+7.41%
RUM - start view	0.0128	0.0148	+15.63%
RUM - start/stop session replay recording	0.0007	0.0008	+14.29%
Logs - log message	0.0143	0.0153	+6.99%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	27.50 KiB	27.42 KiB	-76 B
RUM - add action	99.12 KiB	52.90 KiB	-46.21 KiB
RUM - add timing	26.32 KiB	26.19 KiB	-126 B
RUM - add error	113.01 KiB	57.94 KiB	-55.07 KiB
RUM - start/stop session replay recording	25.59 KiB	25.83 KiB	+246 B
RUM - start view	472.43 KiB	470.18 KiB	-2.25 KiB
Logs - log message	44.08 KiB	100.83 KiB	+56.75 KiB

🔗 RealWorld

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore deprecated INP_SUBPARTS enum member

Removing ExperimentalFeature.INP_SUBPARTS is a source-compatible break for TypeScript consumers that already reference this exported enum value in app code (for example in addExperimentalFeatures([ExperimentalFeature.INP_SUBPARTS])), and those projects will fail to compile immediately after upgrading even though runtime behavior is now default-on. Keeping the enum member as a deprecated no-op alias avoids this avoidable upgrade break while still enabling subparts by default.

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