Adds O11y 9.0.0 RNs (elastic#1064)

Adds the 9.0.0 Elastic Observability release notes and deprecations.

---------

Co-authored-by: Brandon Morelli <[email protected]>

Author: KOTungseth

release-notes/elastic-observability/breaking-changes.md

@@ -18,7 +18,6 @@ Breaking changes can impact your Elastic applications, potentially disrupting no
 % ::::
 
 ## 9.0.0 [elastic-observability-900-breaking-changes]
-**Release date:** April 2, 2025
 
 ::::{dropdown} Profiling now defaults to 19Hz sampling frequency
 For more information, check [#202278]({{kib-pull}}202278).
@@ -37,15 +36,5 @@ To explore your logs, use the contextual experience in Discover.
 
 To view log streams, use Discover sessions.
 
-
 ::::
 
-::::{dropdown} Removed Logs Explorer
-Logs Explorer has been removed. 
-
-
-For more information, check [#203685]({{kib-pull}}203685).
-
-**Action**<br>
-Use the improved logs exploration experience in Discover.
-::::

release-notes/elastic-observability/deprecations.md

@@ -25,4 +25,20 @@ Review the deprecated functionality for Elastic {{observability}}. While depreca
 % For more information, check [PR #](PR link).
 % **Impact**<br> Impact of deprecation. 
 % **Action**<br> Steps for mitigating deprecation impact.
-% ::::
+% ::::
+
+::::{dropdown} Removed Logs Explorer
+Logs Explorer has been removed. 
+
+For more information, check [#203685]({{kib-pull}}203685).
+
+**Action**<br>
+Use the improved logs exploration experience in Discover.
+::::
+
+::::{dropdown} Removed GA feature flags for host and container views
+The `observability:enableInfrastructureHostsView` and `enableInfrastructureContainerAssetView` feature flags have been removed for host and container views.
+
+For more information, check [#197684]({{kib-pull}}197684).
+
+::::

release-notes/elastic-observability/index.md

@@ -12,7 +12,6 @@ To check for security updates, go to [Security announcements for the Elastic sta
 % Release notes include only features, enhancements, and fixes. Add breaking changes, deprecations, and known issues to the applicable release notes sections.
 
 % ## version.next [elastic-observability-next-release-notes]
-% **Release date:** Month day, year
 
 % ### Features and enhancements [elastic-observability-next-features-enhancements]
 % *
@@ -21,8 +20,21 @@ To check for security updates, go to [Security announcements for the Elastic sta
 % *
 
 ## 9.0.0 [elastic-observability-900-release-notes]
-**Release date:** April 2, 2025
+
+### Features and enhancements [elastic-observability-next-features-enhancements]
+* Improves SLO navigation by separating details from the overview panel [#212826]({{kib-pull}}212826)
+* Enables the new Borealis theme [#210468]({{kib-pull}}210468)
+* Returns a 404 response only when the `screenshot_ref` is truly missing [#215241]({{kib-pull}}215241)
+* Includes the `spaceId` field in Service Level Indicator (SLI) documents [#214278]({{kib-pull}}214278)
+* Includes the recovery reason message in the rule context [#211411]({{kib-pull}}211411)
+* Enhances Synthetic SLOs by adding location context and correcting badge link behavior [#210695]({{kib-pull}}210695)
+* Updates the default sampling frequency to 19Hz [#202278]({{kib-pull}}202278)
 
 ### Fixes [elastic-observability-900-fixes]
-* Fixes chat on the Alerts page [#197126]({{kib-pull}}197126)
-* Fixes an error that could prevent the Observability Infrastructure Inventory view from loading after an upgrade due to missing versioning on inventory_view_saved_object [#207007]({{kib-pull}}207007)
+* Resolves an issue that prevented the chat feature from functioning correctly on the Alerts page [#197126]({{kib-pull}}197126)
+* Addresses a missing versioning issue in `inventory_view_saved_object` that could prevent the Observability Infrastructure Inventory view from loading post-upgrade [#207007]({{kib-pull}}207007)
+* Enables the use of wildcard filters in SLO queries [#213119]({{kib-pull}}213119)
+* Updates the `Close project` navigation label to `Log out` to better reflect the intended action for users in serverless environments [#211463]({{kib-pull}}211463)
+* Fixes an issue where clicking a name badge for a synthetics monitor led to a page that failed to load monitor details [#210695]({{kib-pull}}210695)
+* Fixes code scanning alert no. 456: Incomplete string escaping or encoding [#193909]({{kib-pull}}193909)
+* Fixes code scanning alert: Incomplete string escaping or encoding [#193365]({{kib-pull}}193365)

release-notes/elastic-observability/known-issues.md

@@ -1,5 +1,4 @@
 toc:
   - file: index.md
-  - file: known-issues.md
   - file: breaking-changes.md
   - file: deprecations.md