[Release 3.0] Planned Breaking Changes for 3.0 in Plugin

[peterzhuamazon]

[Release 3.0] Planned Breaking Changes for 3.0 in Plugin

As mentioned in this META Issue, we want to track and increase transparency around the breaking changes planned for the 3.0 release across participating plugins.

Please kindly document all planned breaking changes related to your plugin for 3.0 here, by sharing detailed information about the changes, expected impact, and any guidance for users or other teams to adapt to the changes.

If needed, please also prepare PRs on documentation-website changes as part of the 3.0 release process.

Overall, this would help us deliver a smooth and seamless upgrade experience.

Thanks.

[ps48]

Deprecation and remove post cohesion in 3.0

This plugin supports dashboards-observability for CRUD operations on the Observability index. Based on the proposal from in dashboards-observability 3.0 plan many components have already been migrated to the .kibana index and the rest are on path of removal in 3.0. Hence, we propose to remove the observability backend plugin in 3.0 release.

These are proposed changes based on discussion with @mengweieric @joshuali925 @vamsimanohar