[meta] Remove 7 to 8 deprecated Core API's

[TinaHeiligers]

Deprecated Core API's that need to be removed:

target version	domain package	priority
8.8	application-browser	TBD
8.8	application-browser mocks	TBD
8.8	core-apps-browser-internal	TBD
8.8	core-elasticsearch-server-internal	TBD
8.8	core-http-browser-internal	TBD
8.8	core-metrics-server-internal	TBD
8.8	core-saved-objects-migration-server-internal	TBD
8.8	core-saved-objects-server-internal	TBD
8.8	core-status-server-internal	TBD
8.8	core-usage-data-server-internal	TBD

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)

[pgayvallet]

Some comments:

• @kbn/application-browser

This is about onAppLeave and AppLeaveHandler. AFAIK this can't be removed until we find a proper replacement (see #132600)

• @kbn/core-apps-browser-internal
• @kbn/core-status-server-internal
• @kbn/core-metrics-server-internal
• @kbn/core-usage-data-server-internal

It's about process on the Ops stats (OpsMetrics.process). This is surfacing to public APIs via the stats endpoints, so can we really remove this? Not sure who followed this point, @lukeelmers maybe?

• @kbn/core-elasticsearch-server-internal

It's about the legacy config exposure. We don't have a replacement for that yet (see #119862)

• core-http-browser-internal

This is about the req and res shorthands on IHttpFetchError. Should use request and response instead. Depending on how many consumers are using these properties, it should be fairly easy to remove.

• @kbn/core-saved-objects-migration-server-internal

it's about SavedObjectsMigrationLogger.warning, deprecated in favor of .warn. Removal should be low risk and usages easily identified by the typescript checker, likely.

• @kbn/core-saved-objects-server-internal

It's about SavedObjectAttributes that is deprecated in favor of just not using it. @rudolf any idea of the effort to remove the remaining usages in the code base?

[rudolf]

It's about SavedObjectAttributes that is deprecated in favor of just not using it. @rudolf any idea of the effort to remove the remaining usages in the code base?

I suspect it should be fairly easy for someone who knows the plugins (e.g. the owners) to remove this type. I don't think Core can do this, because often SavedObjectAttributes hides the fact that there isn't an existing type that actually fully describe the saved object type and for us to come up with such a type could be difficult.

[TinaHeiligers]

Additional deprecations for which we do not have a definitive action yet:

• InjectedMetadataSetup to be removed by 8.8 (blocked by Monitoring UI and Fleet)

[TinaHeiligers]

#147723 implements the following changes:

target version	domain package	notes
--	application-browser	blocked by #132600: Deprecation replaced with remarks
--	application-browser mocks	blocked by #132600: Deprecation replaced with remarks
--	core-apps-browser-internal	process on the Ops stats (OpsMetrics.process) surfacing to public APIs via the stats endpoints, cannot remove: replaced deprecation with remarks
--	core-status-server-internal	process on the Ops stats (OpsMetrics.process) surfacing to public APIs via the stats endpoints, cannot remove: replaced deprecation with remarks
--	core-metrics-server-internal	process on the Ops stats (OpsMetrics.process) surfacing to public APIs via the stats endpoints, cannot remove: replaced deprecation with remarks
--	core-usage-data-server-internal	process on the Ops stats (OpsMetrics.process) surfacing to public APIs via the stats endpoints, cannot remove: replaced deprecation with remarks
--	core-elasticsearch-server-internal	blocked by #119862. no remove-by version target, leaving as is
removed	core-saved-objects-migration-server-internal	removed deprecated logger.warning & migrated log level to warn where needed
--	core-saved-objects-server-internal	Core cannot remove the type. Removal dependent on consumer type-safety requirements

Still todo:
core-http-browser-internal

[TinaHeiligers]

Penciling in myself to see this issue through, pending availability

[TinaHeiligers]

refers to new meta issue for 8 to 9 deprecations