ModTime   int64     // Unix nanoseconds.
 Signature [4]byte   // Signature of metadata.
 Type      uint8     // Type if the version
 Flags     uint8
}
```

The following flags are defined:

```
const (
 FreeVersion = 1 << 0
 UsesDataDir = 1 << 1
 InlineData  = 1 << 2
)
```

The "Metadata" section contains a single version, encoded in similar fashion as each version in the `Versions` array

|:-------------------------------------------|:------------------------------------------------------------|
| `minio_node_scanner_bucket_scans_finished` | Total number of bucket scans finished since server start.   |
| `minio_node_scanner_bucket_scans_started`  | Total number of bucket scans started since server start.    |
| `minio_node_scanner_directories_scanned`   | Total number of directories scanned since server start.     |