feat: 오토스케일링/로드밸런싱 검증용 Grafana 대시보드 패널 추가 (#687)

monitoring/grafana/provisioning/dashboards/json/common-dashboard.json

@@ -683,8 +683,125 @@
           "refId": "B"
         }
       ]
+    },
+    {
+      "id": 30,
+      "title": "인스턴스별 RPS — 오토스케일/로드밸런싱 확인용",
+      "type": "timeseries",
+      "gridPos": {
+        "h": 9,
+        "w": 16,
+        "x": 0,
+        "y": 35
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus_ds"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "reqps",
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 2,
+            "fillOpacity": 12,
+            "pointSize": 4,
+            "showPoints": "never",
+            "spanNulls": true,
+            "gradientMode": "opacity"
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "prometheus_ds"
+          },
+          "expr": "sum(rate(http_server_requests_seconds_count{application=\"hard-click\", uri=~\"$uri_filter\"}[1m])) by (instance_name)",
+          "legendFormat": "{{instance_name}}",
+          "refId": "A"
+        }
+      ]
+    },
+    {
+      "id": 31,
+      "title": "활성 인스턴스 수",
+      "type": "stat",
+      "gridPos": {
+        "h": 9,
+        "w": 8,
+        "x": 16,
+        "y": 35
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus_ds"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short",
+          "decimals": 0,
+          "color": {
+            "mode": "fixed",
+            "fixedColor": "#5794F2"
+          },
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "#5794F2",
+                "value": null
+              }
+            ]
+          },
+          "custom": {
+            "fillOpacity": 15,
+            "lineWidth": 2
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "fields": "",
+          "values": false
+        },
+        "orientation": "auto",
+        "textMode": "value",
+        "colorMode": "value",
+        "graphMode": "area",
+        "justifyMode": "auto"
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "prometheus_ds"
+          },
+          "expr": "count(up{job=\"hard-click-backend\"} == 1)",
+          "legendFormat": "active instances",
+          "refId": "A"
+        }
+      ]
     }
   ],
   "schemaVersion": 39,
-  "version": 1
+  "version": 2
 }