Snapshot Size Not Counted in Primary Storage Quota & Volumes Metrics Incorrect – ACS 4.20.0 (KVM + Ceph Reef)

### problem

**Issue 1:**
Volume snapshots for clients are configured to be stored in Primary Storage. However, in the account’s Primary Storage quota, snapshot sizes are not reflected — only the volume size is counted toward the Primary Storage usage.

**Issue 2:**
The Primary Storage is configured with thin provisioning, but in ACS the created volumes show the same values for *Volume Utilization* and *Physical Size* but the actual used size is not showing.

**Issue 3:**
For volume snapshots, only the *virtual size* is displayed; the *physical size* is not shown.

We are currently using KVM (Ubuntu) hypervisors with Ceph as the Primary Storage. Is there any additional configuration required to address these issues.

### versions

Apache CloudStack: 4.20.0

Primary Storage: Ceph Reef

Hypervisors: KVM (Ubuntu)

首先，在 Ubuntu 上使用 KVM 和 Ceph Reef 重現 Apache CloudStack 4.20.0 中回報的三種行為，並將主要儲存配額使用量與磁碟區和快照指標進行比較。完成的標準是確定是否需要進行設定或實作變更，讓快照大小影響配額使用量，並正確顯示磁碟區和快照的實體使用量。

由索引模型根據 Issue 內容生成。