feat(aiops): 长窗口(>1h)分析必须指定应用

全命名空间 6h/24h 聚合数据量过大会拖垮 Loki:前端时间范围旁新增应用范围选择器
(labelValues 候选),>1h 未选应用禁用开始分析并提示;后端同样强制 400(闸门在服务端);
信号采集选择器按 app 收窄后 histogram/stats 从全量变为单应用流,秒级返回。

frontend/src/pages/aiops/index.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useMemo, useState } from 'react'
+import { useCallback, useEffect, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import { LLM_PROVIDERS, matchProvider } from './llmProviders'
 import { Loader2, Play, Save, Sparkles, PlugZap, History, ShieldCheck } from 'lucide-react'
@@ -50,12 +50,28 @@ export default function AiopsPage() {
   const [sources, setSources] = useState<LogSource[]>([])
   const [sourceId, setSourceId] = useState(0)
   const [rangeKey, setRangeKey] = useState<(typeof RANGE_PRESETS)[number]['key']>('15m')
+  const [apps, setApps] = useState<string[]>([])
+  const [app, setApp] = useState('')
   const [question, setQuestion] = useState('')
   const [running, setRunning] = useState(false)
   const [outcome, setOutcome] = useState<AIAnalyzeResponse | null>(null)
   const [promptOpen, setPromptOpen] = useState(false)
   const [enabled, setEnabled] = useState(false)
 
+  // app 候选:长窗口(>1h)必须指定应用收窄聚合范围
+  useEffect(() => {
+    setApp('')
+    setApps([])
+    if (!sourceId) return
+    let active = true
+    logsApi.labelValues(sourceId, 'app')
+      .then(list => { if (active) setApps(Array.isArray(list) ? list : []) })
+      .catch(() => { if (active) setApps([]) })
+    return () => { active = false }
+  }, [sourceId])
+  const rangeMinutes = RANGE_PRESETS.find(r => r.key === rangeKey)?.minutes ?? 15
+  const needApp = rangeMinutes > 60
+
   // ── 配置 ──
   const [config, setConfig] = useState<AIConfig | null>(null)
   const [apiKeyInput, setApiKeyInput] = useState('')
@@ -120,16 +136,16 @@ export default function AiopsPage() {
     if (tab === 'history') loadRuns(runPage)
   }, [tab, runPage, loadRuns])
 
-  const rangeMinutes = useMemo(
-    () => RANGE_PRESETS.find(r => r.key === rangeKey)?.minutes ?? 15,
-    [rangeKey],
-  )
 
   const runAnalysis = async () => {
     if (!sourceId) {
       toast.error('请先选择数据源')
       return
     }
+    if (needApp && !app) {
+      toast.error('超过 1 小时的分析必须指定应用：全命名空间长窗口聚合过慢')
+      return
+    }
     const end = Date.now()
     const start = end - rangeMinutes * 60 * 1000
     setRunning(true)
@@ -140,6 +156,7 @@ export default function AiopsPage() {
         start: start * 1e6,
         end: end * 1e6,
         question: question.trim() || undefined,
+        app: app || undefined,
       })
       setOutcome(res)
       loadConfig()
@@ -255,6 +272,22 @@ export default function AiopsPage() {
                   ))}
                 </div>
               </div>
+              <div className="space-y-1">
+                <Label className="text-xs">
+                  {t('analyze.appScope')}
+                  {needApp && <span className="ml-1 text-destructive">*</span>}
+                </Label>
+                <select
+                  aria-label={t('analyze.appScope')}
+                  className="h-9 min-w-40 rounded-md border bg-background px-3 text-sm"
+                  value={app}
+                  onChange={e => setApp(e.target.value)}
+                >
+                  <option value="">{needApp ? t('analyze.appRequired') : t('analyze.allApps')}</option>
+                  {apps.map(a => <option key={a} value={a}>{a}</option>)}
+                </select>
+                {needApp && <p className="text-[11px] text-warning">{t('analyze.appScopeHint')}</p>}
+              </div>
               <div className="min-w-64 flex-1 space-y-1">
                 <Label className="text-xs">{t('analyze.question')}</Label>
                 <Input
@@ -264,7 +297,7 @@ export default function AiopsPage() {
                   className="h-9"
                 />
               </div>
-              <Button onClick={runAnalysis} disabled={running || !enabled} className="h-9">
+              <Button onClick={runAnalysis} disabled={running || !enabled || (needApp && !app)} className="h-9">
                 {running ? <Loader2 className="mr-1.5 h-4 w-4 animate-spin" /> : <Play className="mr-1.5 h-4 w-4" />}
                 {running ? t('analyze.running') : t('analyze.run')}
               </Button>