✨ [RUMF-1510] Warn the user when a heavy context is used

[amortemousque]

Motivation

Raise awareness about customer data impact on the user bandwidth.

Changes

• For ssr compat:
  • Move getGlobalObject on its own file to avoid circular ref with timer.ts
  • Use getGlobalObject in setTimeout and setInterval
• Compute customer data bytes count at API call
• Add a console warning when 3KiB customer data reach for
  • Global context
  • User
  • Feature flag evaluation
  • Logger context (I made the call since it also uses context manager)
• Warn once per customer data type to avoid spams

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #2120 (d031697) into main (ff79c34) will decrease coverage by 0.04%.
The diff coverage is 78.18%.

@@            Coverage Diff             @@
##             main    #2120      +/-   ##
==========================================
- Coverage   93.62%   93.58%   -0.04%     
==========================================
  Files         179      181       +2     
  Lines        5989     6003      +14     
  Branches     1344     1345       +1     
==========================================
+ Hits         5607     5618      +11     
- Misses        382      385       +3     

Impacted Files	Coverage Δ
packages/core/src/tools/utils.ts	85.41% <ø> (+3.84%)	⬆️
packages/core/src/transport/eventBridge.ts	100.00% <ø> (ø)
packages/core/src/tools/getGlobalObject.ts	20.00% <20.00%> (ø)
packages/core/src/tools/contextManager.ts	94.59% <100.00%> (+0.47%)	⬆️
packages/core/src/tools/getZoneJsOriginalValue.ts	100.00% <100.00%> (ø)
...ackages/core/src/tools/heavyCustomerDataWarning.ts	100.00% <100.00%> (ø)
packages/core/src/tools/timer.ts	100.00% <100.00%> (ø)
packages/logs/src/boot/logsPublicApi.ts	98.07% <100.00%> (ø)
packages/logs/src/domain/logger.ts	94.00% <100.00%> (ø)
packages/rum-core/src/boot/rumPublicApi.ts	91.75% <100.00%> (ø)
... and 2 more

... and 2 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[bcaudan]

❓ question: ‏FMU, for a npm setup with both logs and rum, it would mean that we would warn customers once for all SDK instances, is it intentional?

[amortemousque]

No it was not :)
I moved the "already warn check" to contextManager and featureFlagContext to solve it.
Let me know what you think.