VMs configured with VMHA should be migrated to another storage and kept running when the primary storage is put on maintenance.

### The required feature described as a wish

When a primary storage is put on maintenance, the systemVMs are migrated to another primary storage and all user VMs are stopped. The user VMs are migrated on demand when they are manually started.

This might not be the intended behaviour for Instances on which VMHA is enabled and which are expected to by highly available. We might add a global config which will control if the Instances configured with VMHA are automatically migrated and are kept running.

Creating this issue to discuss and track this feature request.

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Discussed on https://github.com/apache/cloudstack/issues/12215
From the documentation https://docs.cloudstack.apache.org/en/4.22.0.0/adminguide/storage.html#maintenance-mode-for-primary-storage
`it will stop all guests that have any volume on that storage device.`

從連結的主要儲存維護文件和 issue #12215 開始；該內容沒有列出任何實作檔案或測試。釐清 VMHA 執行個體的全域設定和預期行為，包括遷移以及保持 VM 執行，然後定義能夠展示約定結果的測試或文件。

由索引模型根據 Issue 內容生成。