Related to #656
Windows guest agents can return multiple directory mountpoints (C:\, C:\Users,
C:\Windows) all on the same physical drive. When the QEMU guest agent omits
disk[] metadata, commit 5325ef481 falls back to using the mountpoint string
as the disk identifier. This causes every Windows directory to be treated as
a separate disk, accumulating to inflated totals (e.g., 1TB reported for a
250GB drive).
Root cause:
The fallback logic in pkg/proxmox/client.go:1585-1594 assigns fs.Disk =
fs.Mountpoint when disk[] is missing. On Windows, every directory path is
unique, so the deduplication guard in internal/monitoring/monitor_polling.go:
619-635 never triggers, causing all directories to be summed.
Changes:
- Detect Windows-style mountpoints (drive letter + colon + backslash)
- Normalize to drive root when disk[] is missing (e.g., C:\Users → C:)
- Preserve existing behavior for Linux/BSD and VMs with disk[] metadata
- Add debug logging for synthesized Windows drive identifiers
This fix maintains backward compatibility with commit 5325ef481 while
preventing the Windows directory accumulation issue. LXC containers are
unaffected as they use a different code path.
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