시스템 모니터

backend/api/anomaly/zscore.get.ts

@@ -0,0 +1,149 @@
+import { getDb } from '../../utils/db'
+
+export default defineEventHandler(async (event) => {
+  const db = getDb()
+  const WARNING_Z = 2.0
+  const DANGER_Z = 3.0
+  
+  const servers = db.prepare(`
+    SELECT target_id, server_name 
+    FROM server_targets 
+    WHERE is_active = 1 
+    ORDER BY server_name
+  `).all() as any[]
+  
+  const anomalies: any[] = []
+  const serverResults: any[] = []
+  
+  // 로그 저장용
+  const insertLog = db.prepare(`
+    INSERT INTO anomaly_logs (target_id, server_name, detect_type, metric, level, current_value, threshold_value, message)
+    VALUES (?, ?, 'zscore', ?, ?, ?, ?, ?)
+  `)
+  
+  const recentLogExists = db.prepare(`
+    SELECT 1 FROM anomaly_logs 
+    WHERE target_id = ? AND detect_type = 'zscore' AND metric = ?
+    AND detected_at > datetime('now', '-1 minute', 'localtime')
+    LIMIT 1
+  `)
+  
+  for (const server of servers) {
+    const snapshots = db.prepare(`
+      SELECT cpu_percent, memory_percent, collected_at
+      FROM server_snapshots
+      WHERE target_id = ?
+        AND collected_at >= datetime('now', '-1 hour', 'localtime')
+      ORDER BY collected_at DESC
+    `).all(server.target_id) as any[]
+    
+    if (snapshots.length < 10) {
+      serverResults.push({
+        target_id: server.target_id,
+        server_name: server.server_name,
+        cpu_zscore: null,
+        mem_zscore: null,
+        cpu_avg: null,
+        cpu_std: null,
+        mem_avg: null,
+        mem_std: null,
+        sample_count: snapshots.length,
+        status: 'insufficient'
+      })
+      continue
+    }
+
+    const current = snapshots[0]
+    const currCpu = current.cpu_percent ?? 0
+    const currMem = current.memory_percent ?? 0
+    
+    const cpuValues = snapshots.map(s => s.cpu_percent ?? 0)
+    const memValues = snapshots.map(s => s.memory_percent ?? 0)
+    
+    const cpuAvg = cpuValues.reduce((a, b) => a + b, 0) / cpuValues.length
+    const memAvg = memValues.reduce((a, b) => a + b, 0) / memValues.length
+    
+    const cpuVariance = cpuValues.reduce((sum, val) => sum + Math.pow(val - cpuAvg, 2), 0) / cpuValues.length
+    const memVariance = memValues.reduce((sum, val) => sum + Math.pow(val - memAvg, 2), 0) / memValues.length
+    const cpuStd = Math.sqrt(cpuVariance)
+    const memStd = Math.sqrt(memVariance)
+    
+    const cpuZscore = cpuStd > 0.1 ? (currCpu - cpuAvg) / cpuStd : 0
+    const memZscore = memStd > 0.1 ? (currMem - memAvg) / memStd : 0
+    
+    let status = 'normal'
+    const maxZ = Math.max(Math.abs(cpuZscore), Math.abs(memZscore))
+    if (maxZ >= DANGER_Z) status = 'danger'
+    else if (maxZ >= WARNING_Z) status = 'warning'
+    
+    serverResults.push({
+      target_id: server.target_id,
+      server_name: server.server_name,
+      cpu_current: currCpu,
+      mem_current: currMem,
+      cpu_zscore: cpuZscore,
+      mem_zscore: memZscore,
+      cpu_avg: cpuAvg,
+      cpu_std: cpuStd,
+      mem_avg: memAvg,
+      mem_std: memStd,
+      sample_count: snapshots.length,
+      status
+    })
+
+    // CPU 이상 감지 + 로그 저장
+    if (Math.abs(cpuZscore) >= WARNING_Z) {
+      const level = Math.abs(cpuZscore) >= DANGER_Z ? 'danger' : 'warning'
+      const direction = cpuZscore >= 0 ? '높음' : '낮음'
+      const message = `CPU 평균 대비 ${Math.abs(cpuZscore).toFixed(1)}σ ${direction} (평균: ${cpuAvg.toFixed(1)}%, 현재: ${currCpu.toFixed(1)}%)`
+      
+      anomalies.push({
+        target_id: server.target_id,
+        server_name: server.server_name,
+        metric: 'CPU',
+        current: currCpu,
+        avg: cpuAvg,
+        std: cpuStd,
+        zscore: cpuZscore,
+        direction: cpuZscore >= 0 ? 'up' : 'down',
+        level
+      })
+      
+      if (!recentLogExists.get(server.target_id, 'CPU')) {
+        insertLog.run(server.target_id, server.server_name, 'CPU', level, currCpu, cpuZscore, message)
+      }
+    }
+    
+    // Memory 이상 감지 + 로그 저장
+    if (Math.abs(memZscore) >= WARNING_Z) {
+      const level = Math.abs(memZscore) >= DANGER_Z ? 'danger' : 'warning'
+      const direction = memZscore >= 0 ? '높음' : '낮음'
+      const message = `Memory 평균 대비 ${Math.abs(memZscore).toFixed(1)}σ ${direction} (평균: ${memAvg.toFixed(1)}%, 현재: ${currMem.toFixed(1)}%)`
+      
+      anomalies.push({
+        target_id: server.target_id,
+        server_name: server.server_name,
+        metric: 'Memory',
+        current: currMem,
+        avg: memAvg,
+        std: memStd,
+        zscore: memZscore,
+        direction: memZscore >= 0 ? 'up' : 'down',
+        level
+      })
+      
+      if (!recentLogExists.get(server.target_id, 'Memory')) {
+        insertLog.run(server.target_id, server.server_name, 'Memory', level, currMem, memZscore, message)
+      }
+    }
+  }
+  
+  anomalies.sort((a, b) => Math.abs(b.zscore) - Math.abs(a.zscore))
+  
+  return {
+    anomalies,
+    servers: serverResults,
+    thresholds: { warning: WARNING_Z, danger: DANGER_Z },
+    timestamp: new Date().toISOString()
+  }
+})