[Docs] Add release notes for 8.15.3 (#196083)

This PR adds release notes for Kibana 8.15.3.

Rel: https://github.com/elastic/dev/issues/2833
Closes: https://github.com/elastic/platform-docs-team/issues/535

---------

Co-authored-by: David Kilfoyle <41695641+kilfoyle@users.noreply.github.com>

docs/CHANGELOG.asciidoc

@@ -10,6 +10,7 @@
 
 Review important information about the {kib} 8.x releases.
 
+* <<release-notes-8.15.3>>
 * <<release-notes-8.15.2>>
 * <<release-notes-8.15.1>>
 * <<release-notes-8.15.0>>
@@ -76,6 +77,44 @@ Review important information about the {kib} 8.x releases.
 
 include::upgrade-notes.asciidoc[]
 
+[[release-notes-8.15.3]]
+== {kib} 8.15.3
+
+The 8.15.3 release includes the following bug fixes.
+
+[float]
+[[fixes-v8.15.3]]
+=== Bug fixes
+Alerting::
+* Fixes a storage configuration error that could prevent the Stack Management > Alerts page from loading correctly ({kibana-pull}194785[#194785]).
+* Fixes a bug preventing certain alerts with Role visibility set to "Stack Rules" from being shown on the Stack Management page ({kibana-pull}194615[#194615]).
+* Fixes an issue where rules created from Discover before version 8.11.0 could no longer be accessed after upgrading ({kibana-pull}192321[#192321]).
+Dashboards::
+* Fixes an issue where the `embed=true` parameter was missing when sharing a dashboard with the Embed code option ({kibana-pull}194366[#194366]).
+Discover::
+* Fixes an issue with the document viewer panel not opening in focus mode ({kibana-pull}191039[#191039]).
+Elastic Observability solution::
+* Fixes the OpenTelemetry guided onboarding for MacOS with x86_64 architectures ({kibana-pull}194915[#194915]).
+* Fixes a bug where the SLO creation form was allowing multiple values for timestamp fields ({kibana-pull}194311[#194311]).
+Elastic Search solution::
+* Fixes a bug with the https://www.elastic.co/guide/en/enterprise-search/8.15/connectors-network-drive.html[Network Drive connector] where advanced configuration fields were not displayed for CSV file role mappings with `Drive Type: Linux` selected ({kibana-pull}195567[#195567]).
+Elastic Security solution::
+For the Elastic Security 8.15.3 release information, refer to {security-guide}/release-notes.html[_Elastic Security Solution Release Notes_].
+Kibana security::
+* Automatic Import no longer asks the LLM to map fields to reserved ECS fields ({kibana-pull}195168[#195168]).
+* Automatic Import no longer returns an "Invalid ECS field" message when the ECS mapping slightly differs from the expected format. For example `date_format` instead of `date_formats` ({kibana-pull}195167[#195167]).
+* Fixes an issue that was causing the Grok processor to return non-ECS compatible fields when processing structured or unstructured syslog samples in Automatic Import ({kibana-pull}194727[#194727]).
+* Fixes the integrationName when uploading a new version of an existing integration using a ZIP upload ({kibana-pull}194298[#194298]).
+* Fixes a bug that caused the Deploy step of Automatic Import to fail after a pipeline was edited and saved ({kibana-pull}194203[#194203]).
+* Fixes an issue in the Kibana Management > Roles page where users could not sort the table by clicking the column headers ({kibana-pull}194196[#194196]).
+Lens & Visualizations::
+* Fixes an issue where the legend label truncation setting wasn't working properly for heat maps in Lens ({kibana-pull}195928[#195928]).
+Machine Learning::
+* Fixes an issue preventing Anomaly swim lane panels from updating on query changes ({kibana-pull}195090[#195090]).
+* Fixes an issue that could cause the "rows per page" option to disappear from the Anomaly timeline view in the Anomaly Explorer ({kibana-pull}194531[#194531]).
+* Fixes an issue causing screen flickering on the Results Explorer and Analytics Map pages when no jobs are available ({kibana-pull}193890[#193890]).
+
+
 [[release-notes-8.15.2]]
 == {kib} 8.15.2