Create CHANGELOG-1.5.1.md

CHANGELOG/CHANGELOG-1.5.1.md

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+## Release Note
+### **v1.5.1 released!** 🎆
+
+Longhorn v1.5.1 is the latest version of Longhorn 1.5.
+This release introduces bug fixes as described below about 1.5.0 upgrade issues, stability, troubleshooting and so on. Please try it and feedback. Thanks for all the contributions!
+
+> For the definition of stable or latest release, please check [here](https://github.com/longhorn/longhorn#releases).
+
+## Installation
+
+> **Please ensure your Kubernetes cluster is at least v1.21 before installing v1.5.1.**
+
+Longhorn supports 3 installation ways including Rancher App Marketplace, Kubectl, and Helm. Follow the installation instructions [here](https://longhorn.io/docs/1.5.1/deploy/install/).
+
+## Upgrade
+
+> **Please read the [important notes](https://longhorn.io/docs/1.5.1/deploy/important-notes/) first and ensure your Kubernetes cluster is at least v1.21 before upgrading to Longhorn v1.5.1 from v1.4.x/v1.5.0, which are only supported source versions.**
+
+Follow the upgrade instructions [here](https://longhorn.io/docs/1.5.1/deploy/upgrade/).
+
+## Deprecation & Incompatibilities
+
+N/A
+
+## Known Issues after Release
+
+Please follow up on [here](https://github.com/longhorn/longhorn/wiki/Outstanding-Known-Issues-of-Releases) about any outstanding issues found after this release.
+
+## Improvement
+  
+  - [IMPROVEMENT] Implement/fix the unit tests of Volume Attachment and volume controller ([6005](https://github.com/longhorn/longhorn/issues/6005)) - @PhanLe1010
+  - [QUESTION] Repetitive warnings and errors in a new longhorn setup ([6257](https://github.com/longhorn/longhorn/issues/6257)) - @derekbit @c3y1huang @roger-ryao
+  
+## Resilience
+  
+  - [BUG] 1.5.0 Upgrade: Longhorn conversion webhook server fails ([6259](https://github.com/longhorn/longhorn/issues/6259)) - @derekbit @roger-ryao
+  - [BUG] Race leaves snapshot CRs that cannot be deleted ([6298](https://github.com/longhorn/longhorn/issues/6298)) - @yangchiu @PhanLe1010 @ejweber
+  
+## Bugs
+  
+  - [BUG] Engine continues to attempt to rebuild replica while detaching ([6217](https://github.com/longhorn/longhorn/issues/6217)) - @yangchiu @ejweber
+  - [BUG] Upgrade to 1.5.0 failed: validator.longhorn.io denied the request if having orphan resources ([6246](https://github.com/longhorn/longhorn/issues/6246)) - @derekbit @roger-ryao
+  - [BUG] Unable to receive support bundle from UI when it's large (400MB+) ([6256](https://github.com/longhorn/longhorn/issues/6256)) - @c3y1huang @chriscchien
+  - [BUG] Longhorn Manager Pods CrashLoop after upgrade from 1.4.0 to 1.5.0 while backing up volumes ([6264](https://github.com/longhorn/longhorn/issues/6264)) - @ChanYiLin @roger-ryao
+  - [BUG] Can not delete type=`bi` VolumeSnapshot if related backing image not exist ([6266](https://github.com/longhorn/longhorn/issues/6266)) - @ChanYiLin @chriscchien
+  - [BUG] 1.5.0: AttachVolume.Attach failed for volume, the volume is currently attached to a different node ([6287](https://github.com/longhorn/longhorn/issues/6287)) - @yangchiu @derekbit
+  - [BUG] test case test_setting_priority_class failed in master and v1.5.x ([6319](https://github.com/longhorn/longhorn/issues/6319)) - @derekbit @chriscchien
+  - [BUG] Unused webhook and recovery backend deployment left in helm chart ([6252](https://github.com/longhorn/longhorn/issues/6252)) - @ChanYiLin @chriscchien
+  
+## Misc
+  
+  - [DOC] v1.5.0 additional outgoing firewall ports need to be opened 9501 9502 9503 ([6317](https://github.com/longhorn/longhorn/issues/6317)) - @ChanYiLin @chriscchien
+  
+## Contributors
+
+- @ChanYiLin
+- @PhanLe1010
+- @c3y1huang
+- @chriscchien
+- @derekbit
+- @ejweber
+- @innobead
+- @roger-ryao
+- @yangchiu
+