[9.1] (backport #18247) Release notes for 9.0.8 (#18268)

* Release notes for 9.0.8 (#18247)

* Update release notes for 9.0.8

* finalize release notes

* Update docs/release-notes/index.md

Co-authored-by: Karen Metts <[email protected]>

---------

Co-authored-by: logstashmachine <[email protected]>
Co-authored-by: donoghuc <[email protected]>
Co-authored-by: Karen Metts <[email protected]>
(cherry picked from commit 82ff1f7)

# Conflicts:
#	docs/release-notes/index.md

* Sync 9.0 release notes

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: donoghuc <[email protected]>

Author: 3 people

docs/release-notes/index.md

@@ -200,6 +200,42 @@ The Elasticsearch Input now provides [support](https://github.com/logstash-plugi
 
 * Call connection check after connect [#61](https://github.com/logstash-plugins/logstash-output-tcp/pull/61)
 
+## 9.0.8 [logstash-9.0.8-release-notes]
+
+No user-facing changes in Logstash core.
+
+### Plugins [logstash-plugin-9.0.8-changes]
+
+**Elasticsearch Output - 12.0.7**
+
+* Support both, encoded and non-encoded api-key formats on plugin configuration [#1223](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1223)
+
+
+## 9.0.7 [logstash-9.0.7-release-notes]
+
+### Fixes [logstash-9.0.7-fixes]
+
+* Gauge type metrics, such as current and peak connection counts of Elastic Agent, are now available in the `_node/stats` API response when the `vertices=true` parameter is included. These metrics are particularly useful for monitoring {ls} plugin activity on the {ls} Integration dashboards. [#18089](https://github.com/elastic/logstash/pull/18089)
+* Improve logstash release artifacts file metadata: mtime is preserved when buiilding tar archives. [#18111](https://github.com/elastic/logstash/pull/18111)
+
+### Plugins [logstash-plugin-9.0.7-changes]
+
+**Beats Input - 7.0.3**
+
+* Upgrade netty 4.1.126 [#517](https://github.com/logstash-plugins/logstash-input-beats/pull/517)
+
+**Http Input - 4.1.3**
+
+* Upgrade netty to 4.1.126 [#198](https://github.com/logstash-plugins/logstash-input-http/pull/198)
+
+**Tcp Input - 7.0.3**
+
+* Upgrade netty to 4.1.126 [#235](https://github.com/logstash-plugins/logstash-input-tcp/pull/235)
+
+**Kafka Integration - 11.6.4**
+
+* Display exception chain comes from kafka client [#200](https://github.com/logstash-plugins/logstash-integration-kafka/pull/200)
+
 ## 9.0.6 [logstash-9.0.6-release-notes]
 
 ### Features and enhancements [logstash-9.0.6-features-enhancements]