✨[MFE] Source code context event enrichment

[amortemousque]

Motivation

Release source code context event enrichment by removing the feature flag

Changes

Remove source_code_context feature flag

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

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	174.03 KiB	173.95 KiB	-90 B	-0.05%	✅
Rum Profiler	4.71 KiB	4.71 KiB	0 B	0.00%	✅
Rum Recorder	24.88 KiB	24.88 KiB	0 B	0.00%	✅
Logs	56.54 KiB	56.50 KiB	-44 B	-0.08%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	129.73 KiB	129.65 KiB	-82 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	0.0054	0.0041	-24.07%
RUM - add action	0.0174	0.014	-19.54%
RUM - add error	0.0206	0.0134	-34.95%
addtiming	N/A	0.003	N/A
RUM - start view	0.0175	0.015	-14.29%
RUM - start/stop session replay recording	0.0012	0.0007	-41.67%
Logs - log message	0.0256	0.0199	-22.27%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	27.06 KiB	27.17 KiB	+109 B
RUM - add action	50.07 KiB	52.49 KiB	+2.42 KiB
RUM - add timing	26.31 KiB	26.36 KiB	+52 B
RUM - add error	55.85 KiB	55.69 KiB	-167 B
RUM - start/stop session replay recording	25.55 KiB	25.10 KiB	-463 B
RUM - start view	450.00 KiB	426.90 KiB	-23.10 KiB
Logs - log message	45.01 KiB	100.28 KiB	+55.28 KiB

🔗 RealWorld

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.17% (-0.02%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 26f06cf | Docs | Datadog PR Page | Was this helpful? React with 👍/👎 or give us feedback!}

[chatgpt-codex-connector]

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Reviewed commit: 26f06cf120

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[chatgpt-codex-connector]

Skip source-context hook when no context is configured

Removing the early return in startSourceCodeContext means every RUM session now registers this assemble hook, even when window.DD_SOURCE_CODE_CONTEXT is never provided; in that case the hook still runs for each event and calls getSourceUrl, which parses stack input on the hot path with no chance of producing enrichment. On high-event pages this introduces avoidable per-event CPU overhead for all customers who are not using source-code-context enrichment.

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