feat(monitor): F4 自定义监控仪表盘 — mock 桩改真实 CRUD + PromQL 查询渲染

后端:
- 新增 model/custom_dashboard.go (monitor_custom_dashboards 表)
- 新增 controller/custom_dashboard.go (CRUD + 设默认, 6 路由)
- routes.go 注册 /custom-dashboards 路由组
- database.go AutoMigrate 注册 CustomDashboard

前端:
- grafana.ts: dashboardApi 从 mock 返回空改为真实 HTTP 调用
- metrics.ts: prometheusProxyApi 新增 query/queryRange 方法
- GrafanaPanelContent.tsx: 从随机 mock 数据改为执行 PromQL 查询
  + Recharts LineChart 渲染 graph 类型
  + SVG gauge 渲染 gauge 类型
  + 数值卡片渲染 stat 类型
  + 表格渲染 table 类型
  + 30s 自动刷新 + loading/error 状态
  + 自动发现默认 Prometheus 数据源
- GrafanaDashboard.tsx: 传递 datasourceUrl 到 GrafanaPanelContent

验证: go build✅ npm build✅ 17/17 集成测试通过 E2E CRUD 全通过

frontend/src/api/monitor/grafana.ts

@@ -1,13 +1,56 @@
-// Grafana 仪表盘 API（暂无后端，返回空结果优雅降级） // Logan.Li
-// Q1 类型安全: 对接 types/monitor.ts（GrafanaDashboard）
+// 自定义监控仪表盘 API // Logan.Li
 
+import { http } from '@/utils/request';
 import type { GrafanaDashboard } from '@/types/monitor';
 
 export const dashboardApi = {
-  getDashboards: async (): Promise<{ data: GrafanaDashboard[]; total: number }> => ({ data: [], total: 0 }),
-  getDatasources: async (): Promise<{ data: Record<string, unknown>[]; total: number }> => ({ data: [], total: 0 }),
-  createDashboard: async (_data: Partial<GrafanaDashboard>): Promise<{ success: boolean }> => ({ success: false }),
-  updateDashboard: async (_id: number | string, _data: Partial<GrafanaDashboard>): Promise<{ success: boolean }> => ({ success: false }),
-  deleteDashboard: async (_id: number | string): Promise<{ success: boolean }> => ({ success: false }),
-  createDatasource: async (_data: Record<string, unknown>): Promise<{ success: boolean }> => ({ success: false }),
+  getDashboards: async (): Promise<{ data: GrafanaDashboard[]; total: number }> => {
+    const res = await http.get('/custom-dashboards');
+    // http 自动解包 .data，后端返回 {list, total}
+    const body = (res as Record<string, unknown>) ?? {};
+    const list = (body.list as GrafanaDashboard[]) ?? [];
+    const total = (body.total as number) ?? list.length;
+    return { data: list, total };
+  },
+  getDatasources: async (): Promise<{ data: Record<string, unknown>[]; total: number }> => {
+    // 复用 Prometheus 数据源列表
+    const res = await http.get('/prometheus-datasources');
+    const arr = (res as Record<string, unknown>[]) ?? [];
+    return { data: arr, total: arr.length };
+  },
+  createDashboard: async (data: Partial<GrafanaDashboard>): Promise<{ success: boolean }> => {
+    // 将 panels 数组序列化为 JSON 字符串
+    const payload: Record<string, unknown> = {
+      name: data.name ?? '',
+      description: data.description ?? '',
+      datasource: data.datasource ?? 'prometheus',
+      datasource_url: data.datasourceUrl ?? '',
+      panels: JSON.stringify(data.panels ?? []),
+      is_default: data.isDefault ?? false,
+    };
+    await http.post('/custom-dashboards', payload);
+    return { success: true };
+  },
+  updateDashboard: async (id: number | string, data: Partial<GrafanaDashboard>): Promise<{ success: boolean }> => {
+    const payload: Record<string, unknown> = {};
+    if (data.name !== undefined) payload.name = data.name;
+    if (data.description !== undefined) payload.description = data.description;
+    if (data.datasource !== undefined) payload.datasource = data.datasource;
+    if (data.datasourceUrl !== undefined) payload.datasource_url = data.datasourceUrl;
+    if (data.panels !== undefined) payload.panels = JSON.stringify(data.panels);
+    if (data.isDefault !== undefined) payload.is_default = data.isDefault;
+    await http.put(`/custom-dashboards/${id}`, payload);
+    return { success: true };
+  },
+  deleteDashboard: async (id: number | string): Promise<{ success: boolean }> => {
+    await http.delete(`/custom-dashboards/${id}`);
+    return { success: true };
+  },
+  setDefault: async (id: number | string): Promise<{ success: boolean }> => {
+    await http.post(`/custom-dashboards/${id}/default`);
+    return { success: true };
+  },
+  createDatasource: async (_data: Record<string, unknown>): Promise<{ success: boolean }> => {
+    return { success: false };
+  },
 };

frontend/src/api/monitor/metrics.ts

@@ -25,6 +25,11 @@ export const snmpApi = {
 export const prometheusProxyApi = {
   connect: (url: string) => http.post('/prometheus/connect', { url }),
   dashboard: (url: string, type: string) => http.post('/prometheus/dashboard', { url, type }),
+  // F4: PromQL 即时查询
+  query: (url: string, query: string) => http.post('/prometheus/query', { url, query }),
+  // F4: PromQL 范围查询
+  queryRange: (params: { url: string; query: string; start?: string; end?: string; step?: string }) =>
+    http.post('/prometheus/query_range', params),
 };
 
 export const zabbixProxyApi = {

frontend/src/components/monitor/dashboard/GrafanaDashboard.tsx

@@ -468,7 +468,7 @@ const DashboardTab: React.FC = () => {
             {active.panels.map(p => (
               <Card key={p.id} style={{ gridColumn: `span ${p.width}`, minHeight: `${p.height * 80}px` }}>
                 <CardHeader className="py-2 px-3"><CardTitle className="text-[11px] font-medium">{p.title}</CardTitle></CardHeader>
-                <CardContent className="p-3 pt-0"><GrafanaPanelContent panel={p} /></CardContent>
+                <CardContent className="p-3 pt-0"><GrafanaPanelContent panel={p} datasourceUrl={active.datasourceUrl} /></CardContent>
               </Card>
             ))}
           </div>

frontend/src/components/monitor/dashboard/GrafanaPanelContent.tsx

@@ -1,77 +1,251 @@
-import { TrendingUp } from 'lucide-react';
+/* eslint-disable @typescript-eslint/no-explicit-any */
+// 面板内容渲染 — 执行 PromQL 查询并渲染真实数据 // Logan.Li
+import { useState, useEffect, useCallback } from 'react';
+import { TrendingUp, Loader2, AlertCircle } from 'lucide-react';
+import { LineChart, Line, ResponsiveContainer, XAxis, YAxis, Tooltip, CartesianGrid } from 'recharts';
 import type { Panel } from './GrafanaDashboard';
+import { prometheusProxyApi, promDatasourceApi } from '@/api';
 
-/** 模拟图表数据 */
-function generateChartData(_panel: Panel) {
-  const dataPoints = 24;
-  const data = [];
-  for (let i = 0; i < dataPoints; i++) {
-    data.push({
-      time: new Date(Date.now() - (dataPoints - i) * 3600000).toLocaleTimeString(),
-      value: Math.random() * 100
+// 默认 Prometheus URL 缓存
+let _defaultPromURL: string | null = null;
+
+async function getDefaultPromURL(dashboardURL?: string): Promise<string> {
+  // 1. 优先使用仪表盘指定的 URL
+  if (dashboardURL) return dashboardURL;
+  // 2. 缓存命中
+  if (_defaultPromURL) return _defaultPromURL;
+  // 3. 查询默认 Prometheus 数据源
+  try {
+    const res = await promDatasourceApi.list();
+    const list = (res as any[]) ?? [];
+    const def = list.find((d: any) => d.is_default) || list[0];
+    if (def?.url) {
+      _defaultPromURL = def.url;
+      return def.url;
+    }
+  } catch {
+    // ignore
+  }
+  return '';
+}
+
+// 解析 Prometheus range query 结果
+function parseRangeResult(promResult: any): { time: string; value: number }[] {
+  try {
+    const result = promResult?.data?.result;
+    if (!Array.isArray(result) || result.length === 0) return [];
+
+    // 取第一条时间序列（多序列时合并取均值）
+    const series = result[0];
+    const values = series?.values;
+    if (!Array.isArray(values)) return [];
+
+    return values.map((v: any) => {
+      const ts = v[0] as number;
+      const val = parseFloat(v[1] as string) || 0;
+      const d = new Date(ts * 1000);
+      return {
+        time: `${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}`,
+        value: Math.round(val * 100) / 100,
+      };
     });
+  } catch {
+    return [];
+  }
+}
+
+// 解析 Prometheus instant query 结果
+function parseInstantResult(promResult: any): { labels: Record<string, string>; value: number }[] {
+  try {
+    const result = promResult?.data?.result;
+    if (!Array.isArray(result)) return [];
+    return result.map((r: any) => ({
+      labels: r.metric ?? {},
+      value: parseFloat(Array.isArray(r.value) ? r.value[1] : '0') || 0,
+    }));
+  } catch {
+    return [];
   }
-  return data;
 }
 
 /** 渲染面板内容 */
-export function GrafanaPanelContent({ panel }: { panel: Panel }) {
-  const data = generateChartData(panel);
+export function GrafanaPanelContent({ panel, datasourceUrl }: { panel: Panel; datasourceUrl?: string }) {
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState('');
+  const [chartData, setChartData] = useState<{ time: string; value: number }[]>([]);
+  const [instantData, setInstantData] = useState<{ labels: Record<string, string>; value: number }[]>([]);
+
+  const fetchData = useCallback(async () => {
+    if (!panel.query) return;
+    setLoading(true);
+    setError('');
+    try {
+      const url = await getDefaultPromURL(datasourceUrl);
+      if (!url) {
+        setError('未配置 Prometheus 数据源');
+        setLoading(false);
+        return;
+      }
+
+      if (panel.type === 'graph') {
+        // 范围查询：最近 1 小时，1 分钟步长
+        const now = Math.floor(Date.now() / 1000);
+        const start = now - 3600;
+        const res = await prometheusProxyApi.queryRange({
+          url,
+          query: panel.query,
+          start: String(start),
+          end: String(now),
+          step: '1m',
+        });
+        const parsed = parseRangeResult(res);
+        setChartData(parsed.length > 0 ? parsed : []);
+        if (parsed.length === 0) setError('无数据');
+      } else {
+        // stat / gauge / table 用即时查询
+        const res = await prometheusProxyApi.query(url, panel.query);
+        const parsed = parseInstantResult(res);
+        setInstantData(parsed);
+        if (parsed.length === 0) setError('无数据');
+      }
+    } catch (e: any) {
+      setError(e?.message ? String(e.message).slice(0, 80) : '查询失败');
+    } finally {
+      setLoading(false);
+    }
+  }, [panel.query, panel.type, datasourceUrl]);
+
+  useEffect(() => {
+    fetchData();
+    // 自动刷新（每 30s）
+    const id = setInterval(fetchData, 30000);
+    return () => clearInterval(id);
+  }, [fetchData]);
+
+  // Loading 状态
+  if (loading && chartData.length === 0 && instantData.length === 0) {
+    return (
+      <div className="flex items-center justify-center h-full min-h-[120px]">
+        <Loader2 className="w-5 h-5 animate-spin text-[var(--dg-text-muted)]" />
+      </div>
+    );
+  }
+
+  // Error 状态
+  if (error && chartData.length === 0 && instantData.length === 0) {
+    return (
+      <div className="flex flex-col items-center justify-center h-full min-h-[120px] text-[var(--dg-text-muted)]">
+        <AlertCircle className="w-5 h-5 mb-1 opacity-50" />
+        <span className="text-[11px]">{error}</span>
+      </div>
+    );
+  }
 
   switch (panel.type) {
-    case 'stat':
+    case 'stat': {
+      const val = instantData[0]?.value ?? 0;
+      const unit = (panel.options as any)?.unit ?? '';
       return (
-        <div className="flex flex-col items-center justify-center h-full">
-          <span className="text-4xl font-bold text-blue-500">{Math.floor(Math.random() * 1000)}</span>
-          <span className="text-sm text-muted-foreground mt-2">{panel.options?.unit || 'requests/s'}</span>
+        <div className="flex flex-col items-center justify-center h-full min-h-[120px]">
+          <span className="text-4xl font-bold text-blue-500">
+            {val > 1000 ? (val / 1000).toFixed(1) + 'K' : val.toFixed(2)}
+          </span>
+          {unit && <span className="text-sm text-[var(--dg-text-muted)] mt-2">{unit}</span>}
           <div className="flex items-center gap-1 mt-2 text-green-500 text-sm">
             <TrendingUp className="w-4 h-4" />
-            <span>+12.5%</span>
+            <span>实时</span>
           </div>
         </div>
       );
-    case 'gauge':
+    }
+    case 'gauge': {
+      const val = instantData[0]?.value ?? 0;
+      const pct = Math.min(val, 100);
       return (
-        <div className="flex flex-col items-center justify-center h-full">
+        <div className="flex flex-col items-center justify-center h-full min-h-[120px]">
           <div className="relative w-24 h-24">
             <svg className="w-full h-full" viewBox="0 0 100 100">
-              <circle cx="50" cy="50" r="40" fill="none" stroke="#e5e7eb" strokeWidth="10" />
+              <circle cx="50" cy="50" r="40" fill="none" stroke="var(--dg-border)" strokeWidth="10" />
               <circle
                 cx="50"
                 cy="50"
                 r="40"
                 fill="none"
-                stroke="#3b82f6"
+                stroke={pct > 80 ? '#ef4444' : pct > 60 ? '#f59e0b' : '#3b82f6'}
                 strokeWidth="10"
-                strokeDasharray={`${Math.random() * 251} 251`}
+                strokeDasharray={`${(pct / 100) * 251} 251`}
                 transform="rotate(-90 50 50)"
+                style={{ transition: 'stroke-dasharray 0.5s ease' }}
               />
             </svg>
             <div className="absolute inset-0 flex items-center justify-center">
-              <span className="text-xl font-bold">{Math.floor(Math.random() * 100)}%</span>
+              <span className="text-xl font-bold">{pct.toFixed(1)}%</span>
             </div>
           </div>
-          <span className="text-sm text-muted-foreground mt-2">CPU使用率</span>
+          <span className="text-sm text-[var(--dg-text-muted)] mt-2">{panel.title}</span>
         </div>
       );
-    case 'graph':
-    default:
+    }
+    case 'table': {
+      if (instantData.length === 0) return <div className="text-center py-4 text-xs text-[var(--dg-text-muted)]">无数据</div>;
       return (
-        <div className="h-full flex flex-col">
-          <div className="flex-1 flex items-end gap-1 px-2">
-            {data.map((d, i) => (
-              <div
-                key={i}
-                className="flex-1 bg-blue-500 rounded-t"
-                style={{ height: `${d.value}%`, opacity: 0.3 + (i / data.length) * 0.7 }}
-              />
-            ))}
-          </div>
-          <div className="flex justify-between text-xs text-muted-foreground px-2 pt-2">
-            <span>{data[0].time}</span>
-            <span>{data[data.length - 1].time}</span>
-          </div>
+        <div className="overflow-auto max-h-[200px]">
+          <table className="w-full text-[11px]">
+            <thead>
+              <tr className="border-b border-[var(--dg-border)]">
+                {Object.keys(instantData[0]?.labels ?? {}).slice(0, 3).map((k) => (
+                  <th key={k} className="text-left py-1 px-2 font-medium text-[var(--dg-text-secondary)]">{k}</th>
+                ))}
+                <th className="text-right py-1 px-2 font-medium text-[var(--dg-text-secondary)]">value</th>
+              </tr>
+            </thead>
+            <tbody>
+              {instantData.slice(0, 20).map((row, i) => (
+                <tr key={i} className="border-b border-[var(--dg-border)]/50">
+                  {Object.entries(row.labels).slice(0, 3).map(([k, v]) => (
+                    <td key={k} className="py-1 px-2 text-[var(--dg-text-secondary)]">{v}</td>
+                  ))}
+                  <td className="py-1 px-2 text-right font-mono text-blue-400">{row.value.toFixed(2)}</td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
         </div>
       );
+    }
+    case 'graph':
+    default: {
+      if (chartData.length === 0) {
+        return <div className="text-center py-4 text-xs text-[var(--dg-text-muted)]">无数据</div>;
+      }
+      return (
+        <div className="h-full min-h-[120px]">
+          <ResponsiveContainer width="100%" height="100%">
+            <LineChart data={chartData} margin={{ top: 5, right: 10, bottom: 5, left: -20 }}>
+              <CartesianGrid strokeDasharray="3 3" stroke="var(--dg-border)" opacity={0.3} />
+              <XAxis dataKey="time" tick={{ fontSize: 10, fill: 'var(--dg-text-muted)' }} interval="preserveStartEnd" />
+              <YAxis tick={{ fontSize: 10, fill: 'var(--dg-text-muted)' }} width={45} />
+              <Tooltip
+                contentStyle={{
+                  background: 'var(--dg-bg-secondary)',
+                  border: '1px solid var(--dg-border)',
+                  borderRadius: '6px',
+                  fontSize: '12px',
+                }}
+                labelStyle={{ color: 'var(--dg-text-primary)' }}
+              />
+              <Line
+                type="monotone"
+                dataKey="value"
+                stroke="#3b82f6"
+                strokeWidth={2}
+                dot={false}
+                animationDuration={300}
+              />
+            </LineChart>
+          </ResponsiveContainer>
+        </div>
+      );
+    }
   }
 }