✨ [RUM-6567] Generate new web vitals attribution fields

[sethfowler-datadog]

Motivation

This PR adds code to generate the new web vitals attribution fields that were added to the event format in this PR.

For now, the old web vitals fields remain. To remove them safely without breaking backwards compatibility, we need backend changes, so we'll hold off until those are done.

Changes

• The rum-events-format submodule has been updated to include the new fields.
• The new fields have been added to the appropriate type definitions.
• The code to populate the new fields has been added to viewCollection.ts.
• The tests have been updated appropriately.

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.50%. Comparing base (e263716) to head (dde4a81).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3251      +/-   ##
==========================================
- Coverage   93.51%   93.50%   -0.01%     
==========================================
  Files         288      288              
  Lines        7599     7606       +7     
  Branches     1730     1735       +5     
==========================================
+ Hits         7106     7112       +6     
- Misses        493      494       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sethfowler-datadog]

/to-staging

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2025-01-08 14:19:04 UTC ℹ️ Branch Integration: starting soon, median merge time is 11m40s

Commit 9102f3f453 will soon be integrated into staging-02.

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2025-01-08 14:19:27 UTC 🚨 Branch Integration: This merge request has conflicts

We couldn't automatically merge the commit 9102f3f453 into staging-02!

You can use this resolution PR: #3267 to fix the conflicts.

[sethfowler-datadog]

/to-staging -c

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2025-01-08 15:43:11 UTC ❌ Devflow: /to-staging -c

Cannot cancel integration of 9102f3f453 into staging-02:

This merge request was already processed and can't be unqueued anymore.

To get help about command usage, write /to-staging --help

If you need support, contact us on Slack #devflow with those details!

[sethfowler-datadog]

/to-staging

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2025-01-09 09:31:39 UTC ℹ️ Branch Integration: starting soon, median merge time is 11m40s

Commit 9102f3f453 will soon be integrated into staging-02.

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2025-01-09 09:41:21 UTC 🚨 Branch Integration: The build pipeline contains failing jobs for this merge request

We couldn't automatically merge the commit 9102f3f453 into staging-02.
Build pipeline has failing jobs for ad59a41:

• e2e

⚠️ Do NOT retry failed jobs directly (why?).

What to do next?

• Investigate the failures and when ready, re-add your pull request to the queue!
• If your PR checks are green, try to rebase/merge. It might be because the CI run is a bit old.
• Any question, go check the FAQ.

If you think the errors come from a logical conflict with the target branch, you can create a fix by commenting this pull request with /create-fix-branch -b staging-02

Details

Since those jobs are not marked as being allowed to fail, the pipeline will most likely fail.
Therefore, and to allow other builds to be processed, this merge request has been rejected and the pipeline got canceled.

[sethfowler-datadog]

/to-staging

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2025-01-10 16:12:23 UTC ℹ️ Branch Integration: starting soon, median merge time is 11m40s

Commit 6999e09ce2 will soon be integrated into staging-02.

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2025-01-10 16:25:26 UTC ℹ️ Branch Integration: This commit was successfully integrated

Commit 6999e09ce2 has been merged into staging-02 in merge commit ebdac61980.

Check out the triggered pipeline on Gitlab 🦊

[sethfowler-datadog]

Things LGTM in staging. The old fields are still there:

The new fields reflect the same values:

[sethfowler-datadog]

After clicking around a bit to get INP to show up, here are the old fields:

And the new fields:

The units aren't always perfectly consistent here because the developer extension hardcodes which fields to display with those units; I'll update it in a followup.

Based on these results, I think this is good to go!

[sethfowler-datadog]

/to-staging

[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	144.54 KiB	145.09 KiB	568 B	+0.38%	✅
Logs	51.13 KiB	51.13 KiB	0 B	0.00%	✅
Rum Slim	103.39 KiB	103.90 KiB	526 B	+0.50%	✅
Worker	24.50 KiB	24.50 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base Average Cpu Time (ms)	Local Average Cpu Time (ms)	𝚫
addglobalcontext	0.002	0.002	-0.001
addaction	0.068	0.047	-0.021
addtiming	0.001	0.001	0.000
adderror	0.080	0.059	-0.021
startstopsessionreplayrecording	0.008	0.009	0.000
startview	0.501	0.480	-0.021
logmessage	0.030	0.028	-0.002

🧠 Memory Performance

Action Name	Base Consumption Memory (bytes)	Local Consumption Memory (bytes)	𝚫 (bytes)
addglobalcontext	26.92 KiB	29.22 KiB	2.30 KiB
addaction	53.87 KiB	54.82 KiB	978 B
addtiming	25.94 KiB	29.95 KiB	4.01 KiB
adderror	58.64 KiB	58.29 KiB	-361 B
startstopsessionreplayrecording	25.74 KiB	27.51 KiB	1.76 KiB
startview	411.62 KiB	419.04 KiB	7.42 KiB
logmessage	55.83 KiB	58.75 KiB	2.93 KiB

🔗 RealWorld

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2025-01-14 16:15:33 UTC ℹ️ Branch Integration: starting soon, median merge time is 10m57s

Commit dde4a81679 will soon be integrated into staging-03.

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2025-01-14 16:26:46 UTC ℹ️ Branch Integration: This commit was successfully integrated

Commit dde4a81679 has been merged into staging-03 in merge commit 9cedaef91e.

Check out the triggered pipeline on Gitlab 🦊

[sethfowler-datadog]

OK, I rebased to incorporate the latest changes to the web vitals attribution format. Everything looks good on staging, so I think this is now ready to ship! I'm going to go ahead and merge.