diff --git a/cmd/dashboard/main.go b/cmd/dashboard/main.go
index f71e767..ac983fc 100644
--- a/cmd/dashboard/main.go
+++ b/cmd/dashboard/main.go
@@ -50,6 +50,5 @@ func initDB() {
 func main() {
 	go controller.ServeWeb(dao.Conf.HTTPPort)
 	go rpc.ServeRPC(5555)
-	go alertmanager.Start()
-	select {}
+	alertmanager.Start()
 }
diff --git a/service/alertmanager/alertmanager.go b/service/alertmanager/alertmanager.go
index 27d68c8..600446a 100644
--- a/service/alertmanager/alertmanager.go
+++ b/service/alertmanager/alertmanager.go
@@ -4,6 +4,7 @@ import (
 	"crypto/md5"
 	"encoding/hex"
 	"fmt"
+	"log"
 	"sync"
 	"time"
 
@@ -44,7 +45,19 @@ func Start() {
 	alertsLock.Unlock()
 
 	time.Sleep(time.Second * 10)
-	go checkStatus()
+	var lastPrint time.Time
+	var checkCount uint64
+	for {
+		startedAt := time.Now()
+		checkStatus()
+		checkCount++
+		if lastPrint.Before(startedAt.Add(-1 * time.Hour)) {
+			log.Println("报警规则检测每小时", checkCount, "次", startedAt, time.Now())
+			checkCount = 0
+			lastPrint = startedAt
+		}
+		time.Sleep(time.Until(startedAt.Add(time.Second * dao.SnapshotDelay)))
+	}
 }
 
 func OnRefreshOrAddAlert(alert model.AlertRule) {
@@ -101,28 +114,22 @@ func OnDeleteNotification(id uint64) {
 }
 
 func checkStatus() {
-	startedAt := time.Now()
-	defer func() {
-		time.Sleep(time.Until(startedAt.Add(time.Second * dao.SnapshotDelay)))
-		checkStatus()
-	}()
-
 	alertsLock.RLock()
 	defer alertsLock.RUnlock()
 	dao.ServerLock.RLock()
 	defer dao.ServerLock.RUnlock()
 
-	for j := 0; j < len(alerts); j++ {
+	for _, alert := range alerts {
 		// 跳过未启用
-		if alerts[j].Enable == nil || !*alerts[j].Enable {
+		if alert.Enable == nil || !*alert.Enable {
 			continue
 		}
 		for _, server := range dao.ServerList {
 			// 监测点
-			alertsStore[alerts[j].ID][server.ID] = append(alertsStore[alerts[j].
-				ID][server.ID], alerts[j].Snapshot(server))
+			alertsStore[alert.ID][server.ID] = append(alertsStore[alert.
+				ID][server.ID], alert.Snapshot(server))
 			// 发送通知
-			max, desc := alerts[j].Check(alertsStore[alerts[j].ID][server.ID])
+			max, desc := alert.Check(alertsStore[alert.ID][server.ID])
 			if desc != "" {
 				nID := getNotificationHash(server, desc)
 				var flag bool
@@ -136,7 +143,8 @@ func checkStatus() {
 							nHistory.Duration = time.Hour * 24
 						}
 						nHistory.Until = time.Now().Add(nHistory.Duration)
-						dao.Cache.Set(nID, nHistory, nHistory.Duration)
+						// 缓存有效期加 10 分钟
+						dao.Cache.Set(nID, nHistory, nHistory.Duration+time.Minute*10)
 					}
 				} else {
 					// 新提醒直接通知
@@ -147,15 +155,15 @@ func checkStatus() {
 					}, firstNotificationDelay)
 				}
 				if flag {
-					message := fmt.Sprintf("逮到咯，快去看看！服务器：%s(%s)，报警规则：%s，%s", server.Name, server.Host.IP, alerts[j].Name, desc)
+					message := fmt.Sprintf("逮到咯，快去看看！服务器：%s(%s)，报警规则：%s，%s", server.Name, server.Host.IP, alert.Name, desc)
 					go sendNotification(message)
 				}
 			}
 			// 清理旧数据
 			if max > 0 {
-				for k := 0; k < len(alertsStore[alerts[j].ID][server.ID]); k++ {
-					if max < len(alertsStore[alerts[j].ID][server.ID][k]) {
-						alertsStore[alerts[j].ID][server.ID][k] = alertsStore[alerts[j].ID][server.ID][k][len(alertsStore[alerts[j].ID][server.ID][k])-max:]
+				for k := 0; k < len(alertsStore[alert.ID][server.ID]); k++ {
+					if max < len(alertsStore[alert.ID][server.ID][k]) {
+						alertsStore[alert.ID][server.ID][k] = alertsStore[alert.ID][server.ID][k][len(alertsStore[alert.ID][server.ID][k])-max:]
 					}
 				}
 			}