✨ Collect long animation frames as long task events

[thomas-lebeau]

Motivation

GA Collecting long animation frames

Changes

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.53%. Comparing base (7512878) to head (923877d).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/rum-core/src/boot/startRum.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3272      +/-   ##
==========================================
+ Coverage   93.51%   93.53%   +0.02%     
==========================================
  Files         288      288              
  Lines        7599     7598       -1     
  Branches     1730     1730              
==========================================
+ Hits         7106     7107       +1     
+ Misses        493      491       -2     

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[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	144.54 KiB	144.56 KiB	28 B	+0.02%	✅
Logs	51.13 KiB	51.09 KiB	-46 B	-0.09%	✅
Rum Slim	103.39 KiB	103.42 KiB	36 B	+0.03%	✅
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	0.000
addaction	0.040	0.041	0.002
addtiming	0.001	0.001	0.000
adderror	0.046	0.067	0.021
startstopsessionreplayrecording	1.181	0.010	-1.171
startview	0.374	0.427	0.053
logmessage	0.034	0.023	-0.011

🧠 Memory Performance

Action Name	Base Consumption Memory (bytes)	Local Consumption Memory (bytes)	𝚫 (bytes)
addglobalcontext	7.80 KiB	29.45 KiB	21.65 KiB
addaction	40.19 KiB	60.13 KiB	19.95 KiB
addtiming	6.58 KiB	26.79 KiB	20.21 KiB
adderror	45.16 KiB	62.23 KiB	17.08 KiB
startstopsessionreplayrecording	6.69 KiB	25.10 KiB	18.42 KiB
startview	420.68 KiB	414.89 KiB	-5922 B
logmessage	42.37 KiB	60.44 KiB	18.07 KiB

🔗 RealWorld

[thomas-lebeau]

A bunch of e2e are verifying the number browser logs (example)

Another solution would be to makes these test for the console log they are actually expecting. But at the same time it is nice to ensure there is no unexpected console logs.

[BenoitZugmeyer]

💬 suggestion: ‏
We should probably adjust performanceObservable.ts to skip observing unsupported entries to avoid spamming the console on customer websites. Something like:

if (!supportPerformanceTimingEvent(options.type)) {
  return
}

[thomas-lebeau]

Performance.supportedEntryTypes is not supported everywhere. For example,
Long Task are supported since chrome 58, but Performance.supportedEntryTypes only since Chrome 73, while we supposedly support chrome 63+

[BenoitZugmeyer]

Well still, I think we should find a way to avoid displaying the warning in browsers without loaf support.

[thomas-lebeau]

yes, as finally we're falling back to Long tasks when LoAF is not supported, I'm starting either Loaf collection or Long task collection in startRum depending on Performance.supportedEntryTypes.

It should work to get rid of the warning because everywhere LoAF are supported Performance.supportedEntryTypes is also supported.