Drafted 2.11 release notes. (#1251)

* Drafted 2.11 release notes.

Signed-off-by: AWSHurneyt <hurneyt@amazon.com>

* Drafted 2.11 release notes.

Signed-off-by: AWSHurneyt <hurneyt@amazon.com>

---------

Signed-off-by: AWSHurneyt <hurneyt@amazon.com>
(cherry picked from commit 3529e03)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-alerting.release-notes-2.11.0.0.md

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+## Version 2.11.0.0 2023-10-11
+Compatible with OpenSearch 2.11.0
+
+### Maintenance
+* Increment version to 2.11.0-SNAPSHOT. ([#1116](https://github.com/opensearch-project/alerting/pull/1116))
+
+### Bug Fixes
+* Fix workflow execution for first run. ([#1227](https://github.com/opensearch-project/alerting/pull/1227))
+
+### Enhancements
+* Add logging for execution and indexes of monitors and workflows. ([#1223](https://github.com/opensearch-project/alerting/pull/1223))
+
+### Refactoring
+* Optimize doc-level monitor workflow for index patterns. ([#1122](https://github.com/opensearch-project/alerting/pull/1122))
+* Add workflow null or empty check only when empty workflow id passed. ([#1139(https://github.com/opensearch-project/alerting/pull/1139))
+* Add primary first calls for different monitor types. ([#1205](https://github.com/opensearch-project/alerting/pull/1205))
+
+### Infrastructure
+* Ignore flaky security test suites. ([#1188](https://github.com/opensearch-project/alerting/pull/1188))
+
+### Documentation
+* Added 2.11 release notes ([#1251](https://github.com/opensearch-project/alerting/pull/1251))