Release Notes 2.9.0 (#648)

* Release Notes 2.9.0

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Signed-off-by: Peter Fitzgibbons <peter.fitzgibbons@gmail.com>
(cherry picked from commit d67a5db)

Co-authored-by: Peter Fitzgibbons <peter.fitzgibbons@gmail.com>

release-notes/dashboards-observability.release-notes-2.9.0.0.md

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+## Version 2.9.0.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards Version 2.9.0
+
+### Features
+- Integrations Plugin ([#317](https://github.com/opensearch-project/dashboards-observability/issues/317))
+
+### Bug Fixes
+- Fix Log patterns UI regressions ([#530](https://github.com/opensearch-project/dashboards-observability/issues/530))
+- [BugFix] Application Analytics - Panels not displaying availability ([#607](https://github.com/opensearch-project/dashboards-observability/pull/607))
+- Upgrade tough-cookie and semver ([#627](https://github.com/opensearch-project/dashboards-observability/pull/627))
+
+## Refactoring
+- Replace metrics panel-separator with ResizableContainer ([#602](https://github.com/opensearch-project/dashboards-observability/pull/602))
+- Remove deprecated layout editor ([#646](https://github.com/opensearch-project/dashboards-observability/pull/646))