Add Elastic Agent 9.1.8 release notes (#11506) (#11538)

* add the 9.1.8 Elastic Agent release notes

* Update changelog for version 9.1.8

* Update index.md

* Update docs/release-notes/_snippets/9.1.8/index.md



* Update docs/release-notes/_snippets/9.1.8/index.md



* Update docs/release-notes/_snippets/9.1.8/index.md



---------




(cherry picked from commit 73394f7)

Co-authored-by: elastic-vault-github-plugin-prod[bot] <150874479+elastic-vault-github-plugin-prod[bot]@users.noreply.github.com>
Co-authored-by: pierrehilbert <[email protected]>
Co-authored-by: Pierre HILBERT <[email protected]>
Co-authored-by: Karen Metts <[email protected]>

Author: 4 people

changelog/9.1.8.yaml

@@ -0,0 +1,41 @@
+version: 9.1.8
+entries:
+    - kind: bug-fix
+      summary: fix filesource provider to work with kubernetes secret mounts
+      description: ""
+      component: elastic-agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/11050
+      issue: []
+      impact: ""
+      action: ""
+      timestamp: 1762438673
+      file:
+        name: 1762438673-fix-filesource-provider-to-work-with-kubernetes-secret-mounts.yaml
+        checksum: 58035340e8d1722d9846474f8795d559a68aaa65
+    - kind: security
+      summary: Redact secrets in slices
+      description: Redact secrets in conifg and component files found in the diagnostics archive that occur within slices.
+      component: elastic-agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/11271
+      issue: []
+      impact: ""
+      action: ""
+      timestamp: 1763589181
+      file:
+        name: 1763589181-Redact-secrets-in-slices.yaml
+        checksum: d9c041559d60973ff9ef8a52616f0e6d21068db7
+    - kind: bug-fix
+      summary: Fix a fatal startup error in Beats Receivers caused by truncation of long UTF-8 hostnames
+      description: ""
+      component: elastic-agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/11285
+      issue: []
+      impact: ""
+      action: ""
+      timestamp: 1763643582
+      file:
+        name: 1763643582-fix-fatal-startup-error-beats-receivers-utf8-hostname.yaml
+        checksum: b5fdea3654facbfbb5c2055494f10390a1309558

changelog/fragments/1762438673-fix-filesource-provider-to-work-with-kubernetes-secret-mounts.yaml

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+## 9.1.8 [elastic-agent-9.1.8-breaking-changes]
+
+_No breaking changes._

changelog/fragments/1763589181-Redact-secrets-in-slices.yaml

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+## 9.1.8 [elastic-agent-9.1.8-deprecations]
+
+_No deprecations._

changelog/fragments/1763643582-fix-fatal-startup-error-beats-receivers-utf8-hostname.yaml

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+## 9.1.8 [elastic-agent-release-notes-9.1.8]
+
+### Fixes [elastic-agent-9.1.8-fixes]
+
+* Redact secrets in slices. [#11271](https://github.com/elastic/elastic-agent/pull/11271) 
+* Fix filesource provider to work with kubernetes secret mounts. [#11050](https://github.com/elastic/elastic-agent/pull/11050)
+* Fix a fatal startup error in Beats Receivers caused by truncation of long UTF-8 hostnames. [#11285](https://github.com/elastic/elastic-agent/pull/11285) 

docs/release-notes/_snippets/9.1.8/breaking-changes.md

@@ -1,3 +1,6 @@
+:::{include} /release-notes/_snippets/9.1.8/breaking-changes.md
+:::
+
 :::{include} /release-notes/_snippets/9.1.7/breaking-changes.md
 :::
 

docs/release-notes/_snippets/9.1.8/deprecations.md

@@ -1,3 +1,6 @@
+:::{include} /release-notes/_snippets/9.1.8/deprecations.md
+:::
+
 :::{include} /release-notes/_snippets/9.1.7/deprecations.md
 :::
 

docs/release-notes/_snippets/9.1.8/index.md

@@ -1,3 +1,6 @@
+:::{include} /release-notes/_snippets/9.1.8/index.md
+:::
+
 :::{include} /release-notes/_snippets/9.1.7/index.md
 :::