feat: drop subsystem name in Storage Box status

Author: lukasmetzner

README.md

@@ -2,6 +2,16 @@
 
 This exporter collects statistics from all **Storage Boxes** in your **Hetzner Cloud project** and exposes them as Prometheus metrics.
 
+## Exported Metrics
+
+| Metric | Description | Labels |
+|--------|-------------|--------|
+| `storage_box_status` | Storage box status (1 = current, 0 = not). Possible status values: `initializing`, `active`, `locked`. | `storage-box`, `status` |
+| `storage_box_stats_size` | Total size of the storage box (bytes used) | `storage-box` |
+| `storage_box_stats_size_data` | Size of data in the storage box (bytes used) | `storage-box` |
+| `storage_box_stats_size_snapshots` | Size of snapshots in the storage box (bytes used) | `storage-box` |
+| `storage_box_type_size` | Total capacity of the storage box type (bytes used) | `storage-box` |
+
 ## Docker Compose
 
 ```yaml

main.go

@@ -27,7 +27,6 @@ var StorageBoxStatusList = []hcloud.StorageBoxStatus{
 var (
 	status = promauto.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: "storage_box",
-		Subsystem: "status",
 		Name:      "status",
 	}, []string{"storage-box", "status"})