✨ Add input, process and render durations to INP

[arichard-info]

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Motivation

When analysing the INP, it's very useful to have details of the durations: the input, processing and rendering delay.

This information can be calculated from processingStart and processingEnd, which are returned by the PerformanceObserver.

It's a proposition, and the attributes can be renamed. And I don't know if there's equivalent work to be done to make this information available in the Datadog UI, but here's a first draft

Changes

Addition of the values

• interaction_to_next_paint_input
• interaction_to_next_paint_process
• interaction_to_next_paint_render
• interaction_to_next_paint_type.

Testing

• [ ] Local
• [ ] Staging
• [x] Unit
• [ ] End to end

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[bcaudan]

Hi @arichard-info,

It seems that this PR did not manage to get our attention... I am closing it for now but if you are still interested by this topic could you instead open an issue and provide more details on how you would use those extra fields?