👷‍♀️ [RUM-5590] Add telemetry for INP null target

[cy-moi]

Motivation

Add telemetry for INP null target to get the impact.

Changes

Add telemetry debug

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 93.63%. Comparing base (e955594) to head (32dfdcf).
Report is 4 commits behind head on main.

Files	Patch %	Lines
...in/view/viewMetrics/trackInteractionToNextPaint.ts	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2895      +/-   ##
==========================================
- Coverage   93.67%   93.63%   -0.04%     
==========================================
  Files         268      268              
  Lines        7584     7592       +8     
  Branches     1686     1691       +5     
==========================================
+ Hits         7104     7109       +5     
- Misses        480      483       +3     

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[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	160.08 KiB	160.19 KiB	114 B	+0.07%	✅
Logs	56.83 KiB	56.83 KiB	0 B	0.00%	✅
Rum Slim	108.70 KiB	108.81 KiB	114 B	+0.10%	✅
Worker	25.21 KiB	25.21 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	0.054	0.034	-0.019
adderror	0.043	0.038	-0.006
addtiming	0.001	0.001	0.000
startview	1.161	1.165	0.004
startstopsessionreplayrecording	0.901	2.161	1.259
logmessage	0.026	0.034	0.008

🧠 Memory Performance

Action Name	Base Consumption Memory (bytes)	Local Consumption Memory (bytes)	𝚫 (bytes)
addglobalcontext	21.65 KiB	21.47 KiB	-182 B
addaction	74.93 KiB	75.00 KiB	70 B
adderror	88.80 KiB	87.11 KiB	-1732 B
addtiming	18.43 KiB	18.51 KiB	77 B
startview	347.61 KiB	352.33 KiB	4.73 KiB
startstopsessionreplayrecording	14.47 KiB	13.57 KiB	-924 B
logmessage	73.10 KiB	71.93 KiB	-1195 B

🔗 RealWorld

[amortemousque]

🔨 warning: JSON.stringify(newInteraction.target) will always return {} for a DOM node. Maybe you could do it like so:

{
hasTarget: !!newInteraction.target
targetIsConnected: newInteraction.target?.isConnected,
...
}

Also don't you want to know if an element node is connected or nor?

‏

[amortemousque]

💬 suggestion: ‏To reduce the number of telemetry, you could collect it only when there is no interactionToNextPaintTargetSelector.
Also collecting the telemetry on org2 could be enough. So you could use a feature flag.

[N-Boutaib]

LGTM

[BenoitZugmeyer]

💬 suggestion: ‏to simplify a little bit:

      if (inpTarget && isElementNode(inpTarget)) {
        interactionToNextPaintTargetSelector = getSelectorFromElement(inpTarget, configuration.actionNameAttribute)
      } else {
        interactionToNextPaintTargetSelector = undefined
      }
      if (!interactionToNextPaintTargetSelector && isExperimentalFeatureEnabled(ExperimentalFeature.NULL_INP_TELEMETRY)) {
         addTelemetryDebug("Fail to get INP target selector", {
           hasTarget: !!inpTarget,
           targetIsConnected: inpTarget ? inpTarget.isConnected : undefined,
           targetIsElementNode: inpTarget ? isElementNode(inpTarget) : undefined,
           inp: newInteraction.duration
         })
      }

Also collect isElementNode so we cover the whole condition (inpTarget && isElementNode(inpTarget))