fix: 完善Agent系统信息上报

- 持续上报系统元数据并动态更新运行时长
- 兼容旧版心跳补齐资产运行时长
- 修复监控指标当前值重复显示单位

agent/main.go

@@ -116,12 +116,11 @@ func main() {
 
 	sysInfo := collector.CollectSystem()
 	logger.Printf("系统信息: OS=%q Kernel=%q", sysInfo.OSVersion, sysInfo.Kernel)
+	agentStartedAt := time.Now()
 
 	localIP := detectLocalIP()
 	logger.Printf("探测本机 IP: %s", localIP)
 
-	sysReportCount := 0
-
 	taskExecutor := task.New(logger)
 	taskClient := task.NewClient(httpCli, cfg.Hostname, logger)
 
@@ -135,20 +134,17 @@ func main() {
 	var probeConfigs []model.ProbeConfig
 
 	collectAndReport := func() {
+		currentUptime := sysInfo.UptimeSeconds + int64(time.Since(agentStartedAt).Seconds())
 		report := &model.Report{
 			Hostname:     cfg.Hostname,
 			IP:           localIP,
 			Timestamp:    time.Now().UTC().Format(time.RFC3339),
 			AgentVersion: version,
-		}
-
-		if sysReportCount < 3 && (sysInfo.OSVersion != "" || sysInfo.Kernel != "") {
-			report.System = &model.SystemStat{
+			System: &model.SystemStat{
 				OSVersion: sysInfo.OSVersion,
 				Kernel:    sysInfo.Kernel,
-				Uptime:    sysInfo.UptimeSeconds,
-			}
-			sysReportCount++
+				Uptime:    currentUptime,
+			},
 		}
 
 		if stat, err := cpuCollector.Collect(); err != nil {
@@ -211,7 +207,7 @@ func main() {
 		runtime.ReadMemStats(&memStats)
 		report.Heartbeat = model.AgentHeartbeat{
 			Version:   version,
-			UptimeSec: sysInfo.UptimeSeconds,
+			UptimeSec: currentUptime,
 			SelfCPU:   0,
 			SelfRSSMB: float64(memStats.Alloc) / 1024.0 / 1024.0,
 			ReportSeq: reportSeq,