Added 2.9 release notes.

Signed-off-by: AWSHurneyt <[email protected]>

release-notes/opensearch-alerting-dashboards-plugin.release-notes-2.9.0.0.md

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+## Version 2.8.0.0 2023-05-26
+Compatible with OpenSearch Dashboards 2.8.0
+
+### Maintenance
+* Increment version to 2.9.0.0. ([#580](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/580))
+
+### Features
+* Integrate with Vis Augmenter to augment Dashboard visualizations. ([#596](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/596))
+* Implemented support for configuring a cluster metrics monitor to call cat/indices, and cat/shards. ([#609](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/609))
+* Implemented composite monitors. ([#611](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/611))
+
+### Bug Fixes
+* Fixed a bug impacting data filter configuration through the visual editor. ([#574](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/574))
+* Fixed a unit test. ([#576](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/576))
+* Temporary fix for blank monitor name on Monitors page issue. ([#593](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/593))
+
+### Documentation
+* Added 2.9.0 release notes. ([#]())