fix: correct Grafana dashboard metric names for backup size and duration panels

bin/README.md

@@ -4,8 +4,8 @@ This directory contains pre-compiled binaries for the DB Backup Tool across mult
 
 ## Build Information
 - **Version**: 3.42.10
-- **Build Time**: 2026-01-08_10:59:00_UTC
-- **Git Commit**: 92402f0
+- **Build Time**: 2026-01-08_11:47:09_UTC
+- **Git Commit**: b05c2be
 
 ## Recent Updates (v1.1.0)
 - ✅ Fixed TUI progress display with line-by-line output

grafana/dbbackup-dashboard.json

@@ -474,7 +474,7 @@
             "uid": "${DS_PROMETHEUS}"
           },
           "editorMode": "code",
-          "expr": "dbbackup_backup_size_bytes{instance=~\"$instance\"}",
+          "expr": "dbbackup_last_backup_size_bytes{instance=~\"$instance\"}",
           "legendFormat": "{{instance}} - {{database}}",
           "range": true,
           "refId": "A"
@@ -564,7 +564,7 @@
             "uid": "${DS_PROMETHEUS}"
           },
           "editorMode": "code",
-          "expr": "dbbackup_backup_duration_seconds{instance=~\"$instance\"}",
+          "expr": "dbbackup_last_backup_duration_seconds{instance=~\"$instance\"}",
           "legendFormat": "{{instance}} - {{database}}",
           "range": true,
           "refId": "A"
@@ -744,7 +744,7 @@
             "uid": "${DS_PROMETHEUS}"
           },
           "editorMode": "code",
-          "expr": "dbbackup_backup_size_bytes{instance=~\"$instance\"}",
+          "expr": "dbbackup_last_backup_size_bytes{instance=~\"$instance\"}",
           "format": "table",
           "hide": false,
           "instant": true,