fix: dashboard metrics 慢查询优化(index+UNIX_TIMESTAMP分组) + 批量升级版本号修复

backend/internal/api/handlers/alert_engine.go

@@ -30,7 +30,7 @@ func (e *AlertEngine) Check() {
 // 检查 CPU/内存/磁盘/进程/TCP连接/端口 阈值
 func (e *AlertEngine) checkResourceAlerts() {
 	var rules []models.AgentRule
-	e.db.Where("enabled = ? AND metric IN ?", true, []string{"cpu", "mem", "disk", "service_process", "tcp_time_wait", "tcp_close_wait"}).Find(&rules)
+	e.db.Where("enabled = ? AND metric IN ?", true, []string{"cpu", "mem", "disk", "service_process", "tcp_time_wait", "tcp_close_wait", "fd"}).Find(&rules)
 
 	for _, rule := range rules {
 		// 获取目标主机最新上报
@@ -81,6 +81,10 @@ func (e *AlertEngine) checkResourceAlerts() {
 				continue // 进程存在，不触发
 			}
 			value = 0 // 进程不存在时触发
+		case "fd":
+			var fdStat models.FDMetric
+			json.Unmarshal([]byte(report.FDInfo), &fdStat)
+			value = fdStat.UsagePct
 		}
 
 		// 检查是否超阈值
@@ -288,7 +292,7 @@ func (e *AlertEngine) autoResolveAlerts() {
 			if report.ID > 0 && time.Since(report.ReportTime) < 3*time.Minute {
 				resolved = true
 			}
-		case "cpu", "mem", "disk", "tcp_time_wait", "tcp_close_wait":
+		case "cpu", "mem", "disk", "tcp_time_wait", "tcp_close_wait", "fd":
 			// 获取对应规则，检查是否恢复正常
 			var rule models.AgentRule
 			e.db.Where("name = ?", alert.RuleName).First(&rule)
@@ -326,6 +330,10 @@ func (e *AlertEngine) autoResolveAlerts() {
 				var netStat models.NetworkStatModel
 				json.Unmarshal([]byte(report.NetInfo), &netStat)
 				value = float64(netStat.TCPCloseWait)
+			case "fd":
+				var fdStat models.FDMetric
+				json.Unmarshal([]byte(report.FDInfo), &fdStat)
+				value = fdStat.UsagePct
 			}
 			if !e.compareOperator(rule.Operator, value, rule.Threshold) {
 				resolved = true