[RUM | User Experience] Update to remove FID and add INP

[paulb-elastic]

Description

The core web vitals are changing to deprecate FID (first input delay) in favour of INP (interaction to next paint).

The User Experience Kibana app (that shows RUM data) has been updated to show INP, in place of FID.

The following documentation needs to be updated to reflect this change:

• https://www.elastic.co/guide/en/observability/current/user-experience.html
• https://www.elastic.co/guide/en/apm/agent/rum-js/current/supported-technologies.html#user-centric-metrics

Notes:

• From 8.12 onwards, the User Experience app will no longer show FID (will only show INP)
  • As such, this change will be from 8.12 onwards, so should not be backported
• An updated version of the RUM Agent (5.16.0 onwards) is needed to capture INP instead of FID
  • If an older version of the RUM Agent is used, it will still only capture FID, so there will be no data shown in the User Experience app for this metric (i.e. we don’t fall back to FID)
  • It's worth calling this out in the docs
• Exploratory View will still give the option to show FID as well as having INP added
  • I can’t recall if Exploratory View is documented, and didn’t see it linked to from the main docs for User Experience, so unsure if there's any docs to update here

Resources

• PR for the Kibana changes: [RUM Dashboard] Replace FID with INP kibana#172467
• RUM Agent PR: feat(rum): report INP metric apm-agent-rum-js#1462

Which documentation set does this change impact?

Stateful only

Feature differences

Stateful only (User Experience app is not in serverless)

What release is this request related to?

8.12

Collaboration model

The documentation team

Point of contact.

Main contact:

• @shahzad31
• @devcorpio

Stakeholders:

• @paulb-elastic
• @drewpost