🐛 add support for arbitrary Error causes

[mormubis]

Motivation

Fixes #3839

Changes

Test instructions

Checklist

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

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 100.00%
• Total Coverage: 92.48% (+0.00%)

View detailed report

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[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	161.20 KiB	161.20 KiB	8 B	0.00%	✅
Rum Recorder	19.53 KiB	19.53 KiB	0 B	0.00%	✅
Rum Profiler	5.32 KiB	5.32 KiB	0 B	0.00%	✅
Logs	55.94 KiB	55.95 KiB	8 B	+0.01%	✅
Flagging	N/A	944 B	944 B	N/A%	✅
Rum Slim	118.73 KiB	118.74 KiB	8 B	+0.01%	✅
Worker	23.60 KiB	23.60 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base Average Cpu Time (ms)	Local Average Cpu Time (ms)	𝚫
addglobalcontext	0.009	0.008	-0.002
addaction	0.034	0.021	-0.012
addtiming	0.008	0.010	0.001
adderror	0.047	0.021	-0.026
startstopsessionreplayrecording	0.004	0.002	-0.002
startview	0.012	0.008	-0.004
logmessage	0.041	0.032	-0.009

🧠 Memory Performance

Action Name	Base Consumption Memory (bytes)	Local Consumption Memory (bytes)	𝚫 (bytes)
addglobalcontext	25.18 KiB	25.88 KiB	708 B
addaction	90.78 KiB	46.43 KiB	-45420 B
addtiming	25.01 KiB	25.28 KiB	277 B
adderror	97.35 KiB	50.80 KiB	-47668 B
startstopsessionreplayrecording	25.08 KiB	25.66 KiB	592 B
startview	435.18 KiB	426.31 KiB	-9079 B
logmessage	86.40 KiB	41.43 KiB	-46051 B

🔗 RealWorld

[mormubis]

/to-staging

[dd-devflow-routing-codex]

View all feedbacks in Devflow UI.

2025-09-19 13:30:50 UTC ℹ️ Start processing command /to-staging

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2025-09-19 13:30:58 UTC ℹ️ Branch Integration: starting soon, merge expected in approximately 13m (p90)

Commit 73dedf8cc3 will soon be integrated into staging-38.

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2025-09-19 13:44:44 UTC ℹ️ Branch Integration: this commit was successfully integrated

Commit 73dedf8cc3 has been merged into staging-38 in merge commit 18489a1875.

Check out the triggered pipeline on Gitlab 🦊

If you need to revert this integration, you can use the following command: /code revert-integration -b staging-38