[Meta][Lens] Technical debt

[flash1293]

This is the Lens meta issue for all technical debt.

Top priority tasks

• Testing ([Lens] Improve functional test coverage #72585)
• State management refactoring ([Lens] Cleanup and architectural adjustments #55599)
• Embeddability architecture ([Lens] Deep Link into a prefilled editor #59845)
• Allow visualization to propagate changes to datasource ([Lens] Server side sortable table columns while in edit mode #55905)
• Decide where to store annotations [Lens] Decide where to store annotation data that is authored in Lens #87562
• [Lens] Expose registerVisualization method #120767

Telemetry

• Simplify visualization telemetry Simplify visualization telemetry #56986
• Scripted terms agg in telemetry [Lens] Replace scripted metric with scripted terms aggregation #70459
• Use kbn/analytics for telemetry [Lens] Bake lens ui metric type into @kbn/analytics #48352
• Remove dynamic names in telemetry collection [Lens] Remove dynamic names in telemetry collection #75312

Field information

• Field existence endpoint uses three APIs instead of one [Lens] Field existence endpoint uses three APIs instead of one #56902
• Remove sampler aggregation in field information [Lens] Field stats endpoint does not need to use sampler aggregation #74595
• Use variable width histogram for field information [Lens] Field list - use variable_width_histogram in field stats endpoint #74275
• Use search source for field existence [Lens] Use search source for field existence #90271

Frame / embeddable

• Visualizations can define more than one type of layer [Lens] Frame allows visualizations to have multiple types of layers with no datasource #87567
• Hardcoded triggers in embeddable [Lens] Lens embeddable hardcodes the supportedTriggers #61605
• Optimize expression rendering [Lens] Optimize expression rendering #49380
• Paginate index pattern list [Lens] Paginate index pattern list, especially if there are > 1000 index patterns stored #55910
• Handling of empty values [Lens] Refactor handling of empty values #68060
• Remove lens multi table [Lens] Remove lens_multi_table #74643
• State update UI performance [Lens] Find and implement generic solution to UI performance #77321
• Expose current data table to visualization and data source [Lens] Lens editor should be able to use the active data in configuration #79194
• Clean up attribute service api AttributeService API deviates from Saved Object client API #83133
• Migrate away from onAppLeave [Lens] Migrate usages of AppMountParameters.onAppLeave to use ScopedHistory.block instead #92204

Index pattern datasource

• Remove usage of rest_total_hits_as_int [Lens] Remove usage of rest_total_hits_as_int #56725
• Request managing layer [Lens] Request managing layer #74493
• Pass reference to data into operations [Lens] Pass the uiSettings default language to filters aggregation #77012
• Generalize operation switches / order changes and retained data [Lens] Remove leaking abstraction from field switch in PopoverEditor #77017
• Allow datasource to control multiple columns at once [Lens] Allow a single operation to create multiple user-facing operations #77949
• Improve performance of field lookup [Lens] Build index pattern field map for O(1) access #82243
• Inlined advanced setting variable: [Lens] Clean up range operation state handling #83420
• Do not store default labels [Lens] Do not persist default labels #84419
• Load index pattern list via service [Lens] Use index pattern service to load list #91801

Code management

• Remove inline eslint-disable-next-line exhaustive-deps [Lens] Remove inline eslint-disable-next-line exhaustive-deps  #74090
• Shared component for index pattern selection Create shared component for index pattern selection #47035
• rename ui components for consistency [Lens] Rename UI components for shared language #74634
• Shared field list component Standalone field list component #41108
• Shared component for ranges [Lens] Create reusable component for filters and range aggregation #77454

Expression integration

• Expression renderer component Clean up and refactor expression renderer component #86729
• Use expression builder [Lens] Use expression builder for datasource and visualizations #94893
• Expose expression functions on the server [Lens] Register all expression functions to the server #97134
• [Lens] Remove multi table #116736
• [Lens] Adds dimension name to datatable column meta information #118516

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[timductive]

Closing old meta issues in favor of more granular, current meta issues