Add release notes for 1.1.0.0 release

release-notes/opensearch-alerting.release-notes-1.1.0.0.md

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+## Version 1.1.0.0 2021-09-08
+
+Compatible with OpenSearch 1.1.0
+
+### Features
+
+* Add BucketSelector pipeline aggregation extension ([#144](https://github.com/opensearch-project/alerting/pull/144))
+* Add AggregationResultBucket ([#148](https://github.com/opensearch-project/alerting/pull/148))
+* Add ActionExecutionPolicy ([#149](https://github.com/opensearch-project/alerting/pull/149))
+* Refactor Monitor and Trigger to split into Query-Level and Bucket-Level Monitors ([#150](https://github.com/opensearch-project/alerting/pull/150))
+* Update InputService for Bucket-Level Alerting ([#152](https://github.com/opensearch-project/alerting/pull/152))
+* Update TriggerService for Bucket-Level Alerting ([#153](https://github.com/opensearch-project/alerting/pull/153))
+* Update AlertService for Bucket-Level Alerting ([#154](https://github.com/opensearch-project/alerting/pull/154))
+* Add worksheets to help with testing ([#151](https://github.com/opensearch-project/alerting/pull/151))
+* Update MonitorRunner for Bucket-Level Alerting ([#155](https://github.com/opensearch-project/alerting/pull/155))
+* Fix ktlint formatting issues ([#156](https://github.com/opensearch-project/alerting/pull/156))
+* Execute Actions on runTrigger exceptions for Bucket-Level Monitor ([#157](https://github.com/opensearch-project/alerting/pull/157))
+* Skip execution of Actions on ACKNOWLEDGED Alerts for Bucket-Level Monitors ([#158](https://github.com/opensearch-project/alerting/pull/158))
+* Return first page of input results in MonitorRunResult for Bucket-Level Monitor ([#159](https://github.com/opensearch-project/alerting/pull/159))
+* Add setting to limit per alert action executions and don't save Alerts for test Bucket-Level Monitors ([#161](https://github.com/opensearch-project/alerting/pull/161))
+* Resolve default for ActionExecutionPolicy at runtime ([#165](https://github.com/opensearch-project/alerting/pull/165))
+
+### Bug Fixes
+
+* Removing All Usages of Action Get Method Calls and adding the listeners ([#130](https://github.com/opensearch-project/alerting/pull/130))
+* Fix bug in paginating multiple bucket paths for Bucket-Level Monitor ([#163](https://github.com/opensearch-project/alerting/pull/163))
+* Various bug fixes for Bucket-Level Alerting ([#164](https://github.com/opensearch-project/alerting/pull/164))
+* Return only monitors for /monitors/_search ([#162](https://github.com/opensearch-project/alerting/pull/162))
+
+### Infrastructure
+
+* Add Integtest.sh for OpenSearch integtest setups ([#121](https://github.com/opensearch-project/alerting/pull/121))
+* Fix snapshot build and increment to 1.1.0 ([#142](https://github.com/opensearch-project/alerting/pull/142))
+
+### Documentation
+
+* Update Bucket-Level Alerting RFC ([#145](https://github.com/opensearch-project/alerting/pull/145))
+
+### Maintenance
+
+* Remove default assignee ([#127](https://github.com/opensearch-project/alerting/pull/127))
+
+### Refactoring
+
+* Refactor MonitorRunner ([#143](https://github.com/opensearch-project/alerting/pull/143))