Move UX server side code out of APM UI

[shahzad31]

We still have node server side code in the APM UI for user experience app, we need to move that out of APM UI.

This is a follow up to elastic/kibana#78430

There are two approaches that will be taken to accomplish this.

User exploratory view to replace charts, this will auto remove server side routes and will make charts completely client side.

In cases where we can't use exploratory view, we should use async search api to make calls to Elasticsearch.

EDIT by @justinkambic:

Areas of focus

• Create common filters shared state
• Service list (web application) - use data plugin search [UX Dashboard] Migrate service list query out of APM kibana#132548
• Percentile - data plugin There's no reference to APM routes for the percentile component
• Environment vars - data plugin [UX Dashboard] Port environment select to use data plugin kibana#134393
• Filter search input - data plugin [UX Dashboard] Remove search url query from APM server kibana#132654
• Client metrics - data plugin - Migrate client metrics from APM to UX kibana#133322
• Metrics- data plugin [UX Dashboard] Move core web vitals query from APM routes to UX plugin kibana#133974
• Core web vitals - data plugin [UX Dashboard] Move core web vitals query from APM routes to UX plugin kibana#133974
• Page load and total page views - exploratory view embeddable [UX Dashboard] Migrate page load duration chart out of APM kibana#132970
  • Page views: [UX Dashboard] Migrate Page Views chart from APM to Exploratory View Embeddable kibana#134758
  • Page load distribution- data plugin for now, until Lens unblocks it: [UX Dashboard] Migrate page load distribution to use data plugin kibana#135072
• Visitor breakdowns - lens embeddable - [UX] Migrate visitor breakdown chart to lens embeddable kibana#134684
• Errors table - data plugin - Move UX JS Errors out of APM UI kibana#133040
• Audit APM for any leftover UX route code
  • hasRumData route: [UX Dashboard] Migrate UX hasData function out of APM server kibana#134524
  • long-task-metrics route: - [UX] Migrate long task metric to UX kibana#134711 (comment)

---

Additional items:

• Explore removal of projections from UX components (APM no longer uses them): covered as part of [UX Dashboard] Migrate page load distribution to use data plugin kibana#135072, which includes the final route removal
  • Move processor_event to shared o11y plugin and replace individual implementations, per this comment [UX Dashboard] Unify processor event kibana#135367
• Add e2e tests for page view chart [UX Dashboard] Page View Chart e2e kibana#135352

[paulb-elastic]

Pushing to 8.3, and the expectation is that the simplest implementation is done for this to get out of the APM UI codebase

[paulb-elastic]

Moving to 8.4 as these PRs are not being merged on for 8.3

[emilioalvap]

@shahzad31 @justinkambic Checking percentile component, it seems to be statically declared inside the UX plugin. Can we remove that from the task list or is there anything else that needs migrating here?

[paulb-elastic]

Mostly done but moving over to 8.5 board where the last remaining item elastic/kibana#135367 will be targeted for.

[emilioalvap]

Marking as done, last PR was merged into 8.5

[dominiqueclarke]

POST FF Testing:

Did general smoke tests of the UX page on 8.5 local branch via data from oblt-cli.

Looks great, generally, but the browser breakdown and operating system breakdown appears to be broken.

cc: @justinkambic @emilioalvap

[paulb-elastic]

Reopening as per @dominiqueclarke's discovery

[emilioalvap]

Fixed by elastic/kibana#142992.

Moving to Done Done, as @shahzad31 and I have validated it.