[Docs] 8.16.3 release notes (#206156)

## Summary

Adding 8.16.3 release notes.

Rel: [2960](elastic/dev#2960)
Closes: [606](elastic/platform-docs-team#606)

[Preview
here](https://kibana_bk_206156.docs-preview.app.elstc.co/guide/en/kibana/8.x/release-notes-8.16.3.html)

![Screenshot 2025-01-09 at 8 54
29 PM](https://github.com/user-attachments/assets/92ca41b6-db87-4583-94a2-ae29ad524d6a)

Co-authored-by: florent-leborgne <[email protected]>

docs/CHANGELOG.asciidoc

@@ -12,6 +12,7 @@ Review important information about the {kib} 8.x releases.
 
 * <<release-notes-8.17.1>>
 * <<release-notes-8.17.0>>
+* <<release-notes-8.16.3>>
 * <<release-notes-8.16.2>>
 * <<release-notes-8.16.1>>
 * <<release-notes-8.16.0>>
@@ -248,6 +249,31 @@ Machine Learning::
 Kibana platform::
 * Fixes an issue with the global search field that could open the wrong page when pressing "Enter" while results were not yet fully loaded ({kibana-pull}197750[#197750]).
 
+[[release-notes-8.16.3]]
+== {kib} 8.16.3
+
+The 8.16.3 release includes the following bug fixes.
+
+[float]
+[[fixes-v8.16.3]]
+=== Bug fixes
+Alerting::
+* Updates handling of invalid RRule params and prevents infinite looping ({kibana-pull}205650[#205650]).
+* Fixes an issue with saving ECS group by fields at the root level for query DSL rules ({kibana-pull}203769[#203769]).
+* Fixes race condition in alerting rules data view selector ({kibana-pull}203654[#203654]).
+Data ingestion and Fleet::
+* Fixes an issue with showing all agent tags when agent list is filtered ({kibana-pull}205163[#205163]).
+Elastic Observability solution::
+* Preserves `kuery` filters when switching between Universal Profiling pages in new solution navigation ({kibana-pull}203545[#203545]).
+Elastic Search solution::
+* Adds ML as required plugin to Search Assistant ({kibana-pull}204009[#204009]).
+* Fixes web crawler name inconsistencies ({kibana-pull}202738[#202738]).
+Elastic Security solution::
+For the Elastic Security 8.16.3 release information, refer to {security-guide}/release-notes.html[_Elastic Security Solution Release Notes_].
+Kibana security::
+* Fixes Integration and Datastream name validation ({kibana-pull}204943[#204943]).
+* Adds RBAC to the Automatic Import APIs ({kibana-pull}203882[#203882]).
+
 [[release-notes-8.16.2]]
 == {kib} 8.16.2