Release Notes 2.7.0.0 (opensearch-project#394) (opensearch-project#410)

* Release Notes 2.7.0.0

Signed-off-by: Peter Fitzgibbons <pjfitz@amazon.com>

* Release Notes 2.7.0.0

Signed-off-by: Peter Fitzgibbons <pjfitz@amazon.com>

---------

Signed-off-by: Peter Fitzgibbons <pjfitz@amazon.com>
Co-authored-by: Peter Fitzgibbons <pjfitz@amazon.com>
(cherry picked from commit 969e639)

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

release-notes/dashboards-observability.release-notes-2.7.0.0.md

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+## Version 2.7.0.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards Version 2.7.0
+
+### Features
+
+- Observability Visualizations enabled to add to OpenSearch Dashboards /
+  Dashboards [#353](https://github.com/opensearch-project/dashboards-observability/pull/353)
+
+- Display Observability Dashboards in OpenSearch Dashboards / Dashboards
+  listing [#355](https://github.com/opensearch-project/dashboards-observability/pull/355)
+- Observability Left-Navigation now grouped at "first level" of OpenSearch Dashboards Left-Navigation
+  fly-out [#354](https://github.com/opensearch-project/dashboards-observability/pull/354)
+
+### Bug Fixes
+
+### Infrastructure
+