[Docs] Backport 8.16.5 release notes to 8.17 (#212938)

## Summary

Backporting [8.16.5 release
notes](#212688) to 8.17.

docs/CHANGELOG.asciidoc

@@ -13,6 +13,7 @@ Review important information about the {kib} 8.x releases.
 * <<release-notes-8.17.2>>
 * <<release-notes-8.17.1>>
 * <<release-notes-8.17.0>>
+* <<release-notes-8.16.5>>
 * <<release-notes-8.16.4>>
 * <<release-notes-8.16.3>>
 * <<release-notes-8.16.2>>
@@ -289,6 +290,42 @@ 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-8.16.5]]
+== {kib} 8.16.5
+
+The 8.16.5 release includes the following bug fixes.
+
+[float]
+[[enhancement-v8.16.5]]
+=== Enhancements
+Elastic Observability solution::
+* Improve performance in `dependencies` endpoints to prevent high CPU usage ({kibana-pull}209999[#209999]).
+Management::
+* Increase search timeout toast lifetime to 1 week ({kibana-pull}210576[#210576]).
+
+[float]
+[[fixes-v8.16.5]]
+=== Bug fixes
+Alerting::
+* Fixes error message in cases list if case assignee is an empty string ({kibana-pull}209973[#209973]).
+* Provides a fallback view to recover from Stack Alerts page filters bar errors ({kibana-pull}209559[#209559]).
+* Fixes an issue where the popover in the rules page may get stuck when being clicked more than once ({kibana-pull}208996[#208996]).
+Dashboards and Visualizations::
+* Fixes link settings not persisting ({kibana-pull}211041[#211041]).
+* Fixes the Save to library action that could break the chart panel when triggered from a from a "by value" panel ({kibana-pull}210125[#210125]).
+* Fixes an issue with dynamic coloring being disabled for Last value aggregation types in *Lens* ({kibana-pull}209110[#209110]).
+Data ingestion and Fleet::
+* Updates component templates with deprecated setting ({kibana-pull}210200[#210200]).
+Discover::
+* Fixes Discover session embeddable drilldown ({kibana-pull}211678[#211678]).
+* Fixes "Untitled" export title when exporting CSV on a dashboard ({kibana-pull}210143[#210143]).
+Elastic Observability solution::
+* Missing items in the trace waterfall shouldn't break it entirely ({kibana-pull}210210[#210210]).
+Kibana security::
+* Fixes structured log flow to handle multiple types of structured logs ({kibana-pull}212611[#212611]).
+Machine Learning::
+* Fixes unattended Transforms in integration packages not automatically restarting after reauthorizing ({kibana-pull}210217[#210217]).
+
 [[release-notes-8.16.4]]
 == {kib} 8.16.4