Changelog for 9.1.1 (#9263)

* 9.1.1 changelog

* clean up

Author: ebeahan

changelog/9.1.1.asciidoc

@@ -0,0 +1,26 @@
+// begin 9.1.1 relnotes
+
+[[release-notes-9.1.1]]
+==  9.1.1
+
+Review important information about the  9.1.1 release.
+
+[discrete]
+[[new-features-9.1.1]]
+=== New features
+
+The 9.1.1 release adds the following new and notable features.
+
+elastic-agent::
+
+* Add K8s Leader Elector Otel Extension. {elastic-agent-pull}https://github.com/elastic/elastic-agent/pull/9065[#https://github.com/elastic/elastic-agent/pull/9065]
+
+[discrete]
+[[bug-fixes-9.1.1]]
+=== Bug fixes
+
+elastic-agent::
+
+* Do not Overwrite Elasticsearch Output Headers From Enrollment --Headers Flag. {elastic-agent-pull}https://github.com/elastic/elastic-agent/pull/9199[#https://github.com/elastic/elastic-agent/pull/9199] {elastic-agent-issue}https://github.com/elastic/elastic-agent/issues/9197[#https://github.com/elastic/elastic-agent/issues/9197]
+
+// end 9.1.1 relnotes

changelog/9.1.1.yaml

@@ -0,0 +1,27 @@
+version: 9.1.1
+entries:
+    - kind: feature
+      summary: Add k8s leader elector Otel extension
+      description: ""
+      component: elastic-agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/9261
+        - https://github.com/elastic/elastic-agent/pull/9262
+        - https://github.com/elastic/elastic-agent/pull/9065
+      issue: []
+      timestamp: 1752827328
+      file:
+        name: 1752827328-add_k8sleaderelector_extension.yaml
+        checksum: 2dae784245fbcf96055c2a2898fe911ce2eeaea9
+    - kind: bug-fix
+      summary: Don't overwrite elasticsearch output headers from enrollment --headers flag
+      description: ""
+      component: elastic-agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/9199
+      issue:
+        - https://github.com/elastic/elastic-agent/issues/9197
+      timestamp: 1753906482
+      file:
+        name: 1753906482-Don't-overwrite-elasticsearch-output-headers-from-enrollment---headers-flag.yaml
+        checksum: 4f8875518a619395bdb606081ee392ea2b76f70f