[Security] 8.17.9 release notes (#6913) (#6940)

* [Security] 8.17.9 release notes

* fix formatting

* Apply suggestions from code review



---------


(cherry picked from commit 73145dd)

Co-authored-by: natasha-moore-elastic <[email protected]>
Co-authored-by: Benjamin Ironside Goldstein <[email protected]>

Author: 3 people

docs/release-notes.asciidoc

@@ -8,6 +8,7 @@ This section summarizes the changes in each release.
 * <<release-notes-8.18.2, {elastic-sec} version 8.18.2>>
 * <<release-notes-8.18.1, {elastic-sec} version 8.18.1>>
 * <<release-notes-8.18.0, {elastic-sec} version 8.18.0>>
+* <<release-notes-8.17.9, {elastic-sec} version 8.17.9>>
 * <<release-notes-8.17.8, {elastic-sec} version 8.17.8>>
 * <<release-notes-8.17.7, {elastic-sec} version 8.17.7>>
 * <<release-notes-8.17.6, {elastic-sec} version 8.17.6>>

docs/release-notes/8.17.asciidoc

@@ -1,6 +1,21 @@
 [[release-notes-header-8.17.0]]
 == 8.17
 
+[discrete]
+[[release-notes-8.17.9]]
+=== 8.17.9
+
+[discrete]
+[[enhancements-8.17.9]]
+==== Enhancements
+* Shortens the time it takes to recover from a `DEGRADED` status caused by {elastic-agent} communication issues.
+
+[discrete]
+[[bug-fixes-8.17.9]]
+==== Fixes
+* Fixes an issue in {elastic-defend} that sometimes caused bugchecks (BSODs) on Windows Server systems that had a very high volume of network connections. 
+* Fixes a bug where Linux endpoint network events would fail to load if IPv6 was not supported by the system.
+
 [discrete]
 [[release-notes-8.17.8]]
 === 8.17.8