[EBT] Dashboard data loaded event

[lizozom]

Summary

Needed for https://github.com/elastic/kibana-team/issues/501
Depends on #134786

This PR reports a telemetry event each time a dashboard's data is loaded.
It does so by standardizing the loading, rendered and error attributes of the Embeddable interface.
It also adds a readonly property named reportsEmbeddableLoad, to default to immediate rendering, in case the Embeddable doesn't implement specific states.

Each embeddable sets it output with these attributes

• loading - true when loading data, false otherwise
• rendered - true when the visualization is fully rendered (similar to data-rendercomplete`)
• error - any error that happened while loading data or rendering

Each embeddable_child_panel receives an optional callback named onPanelStatusChange. It is called every time the underlaying embeddable changes it's (relevant) output, containg:

• status - the current event, statuses are from EmbeddableRenderStatus
• id - the embeddable id
• timeToEvent - time relative to the component mount
• error - if was returned by the embeddable

The dashboard_grid then listens to the events coming in from all panels, and when all have completed, it reports a telemetry event that contains:

• timeToData - the time it took to load the data of all embeddables (Known issue with vector tile maps @nreese)
• timeToDone - the time it took to render all panels
• status - ok if all loaded successfully, error otherwise.
• numOfPanels - number of panels on that dashboard

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)
• This was checked for cross-browser compatibility

Risk Matrix

Delete this section if it is not applicable to this PR.

Before closing this PR, invite QA, stakeholders, and other developers to identify risks that should be tested prior to the change/feature release.

When forming the risk matrix, consider some of the following examples and how they may potentially impact the change:

Risk	Probability	Severity	Mitigation/Notes
Multiple Spaces—unexpected behavior in non-default Kibana Space.	Low	High	Integration tests will verify that all features are still supported in non-default Kibana Space and when user switches between spaces.
Multiple nodes—Elasticsearch polling might have race conditions when multiple Kibana nodes are polling for the same tasks.	High	Low	Tasks are idempotent, so executing them multiple times will not result in logical error, but will degrade performance. To test for this case we add plenty of unit tests around this logic and document manual testing procedure.
Code should gracefully handle cases when feature X or plugin Y are disabled.	Medium	High	Unit tests will verify that any feature flag or plugin combination still results in our service operational.
See more potential risk examples

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[nreese]

kibana-gis changes LGTM

[afharo]

Please update the EBT FTR docs to reflect the changes to the option fromTimestamp 😇

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 73e33af
• Storybooks Preview
• Webpack Bundle Analyzer

Failed CI Steps

• FTR Configs #27

Test Failures

• [job] [logs] FTR Configs #27 / maps app embeddable maps in embeddable library unlink map panel from embeddable library

Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
embeddable	403	413	+10
lens	522	523	+1
maps	247	248	+1
total			+12

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
dashboard	380.9KB	381.6KB	+696.0B
discover	493.2KB	493.3KB	+145.0B
lens	1.2MB	1.2MB	+254.0B
maps	2.6MB	2.6MB	+469.0B
visualizations	241.8KB	242.0KB	+258.0B
total			+1.8KB

Canvas Sharable Runtime

The Canvas "shareable runtime" is an bundle produced to enable running Canvas workpads outside of Kibana. This bundle is included in third-party webpages that embed canvas and therefor should be as slim as possible.

id	before	after	diff
total size	7.7MB	7.7MB	+93.0B

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
dashboard	65.9KB	66.4KB	+439.0B
embeddable	67.8KB	68.5KB	+686.0B
total			+1.1KB

Unknown metric groups

API count

id	before	after	diff
embeddable	494	505	+11
lens	600	601	+1
maps	248	249	+1
total			+13

History

• 💔 Build #56751 failed a6bf8f8
• 💔 Build #56735 failed b7d4114
• 💔 Build #56606 failed c994f3e
• 💔 Build #56004 failed 6851ae1
• 💔 Build #55956 failed 9331968

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @lizozom