diff --git a/src/server/config/config.go b/src/server/config/config.go
index b9079c66..ebdda00f 100644
--- a/src/server/config/config.go
+++ b/src/server/config/config.go
@@ -98,7 +98,6 @@ func MustLoad(fpaths ...string) {
 		}
 
 		C.Heartbeat.Endpoint = fmt.Sprintf("%s:%d", C.Heartbeat.IP, C.HTTP.Port)
-		C.Alerting.RedisPub.ChannelKey = C.Alerting.RedisPub.ChannelPrefix + C.ClusterName
 
 		if C.Alerting.Webhook.Enable {
 			if C.Alerting.Webhook.Timeout == "" {
@@ -202,23 +201,10 @@ type Config struct {
 	DB                 ormx.DBConfig
 	WriterOpt          WriterGlobalOpt
 	Writers            []WriterOptions
-	Reader             ReaderOptions
+	Reader             PromOption
 	Ibex               Ibex
 }
 
-type ReaderOptions struct {
-	Url           string
-	BasicAuthUser string
-	BasicAuthPass string
-
-	Timeout     int64
-	DialTimeout int64
-
-	MaxIdleConnsPerHost int
-
-	Headers []string
-}
-
 type WriterOptions struct {
 	Url           string
 	BasicAuthUser string
diff --git a/src/server/config/prom_client.go b/src/server/config/prom_client.go
new file mode 100644
index 00000000..de550511
--- /dev/null
+++ b/src/server/config/prom_client.go
@@ -0,0 +1,59 @@
+package config
+
+import (
+	"sync"
+
+	"github.com/didi/nightingale/v5/src/pkg/prom"
+)
+
+type PromClient struct {
+	prom.API
+	ClusterName string
+	sync.RWMutex
+}
+
+var ReaderClient *PromClient = &PromClient{}
+
+func (pc *PromClient) Set(clusterName string, c prom.API) {
+	pc.Lock()
+	defer pc.Unlock()
+	pc.ClusterName = clusterName
+	pc.API = c
+}
+
+func (pc *PromClient) Get() (string, prom.API) {
+	pc.RLock()
+	defer pc.RUnlock()
+	return pc.ClusterName, pc.API
+}
+
+func (pc *PromClient) GetClusterName() string {
+	pc.RLock()
+	defer pc.RUnlock()
+	return pc.ClusterName
+}
+
+func (pc *PromClient) GetCli() prom.API {
+	pc.RLock()
+	defer pc.RUnlock()
+	return pc.API
+}
+
+func (pc *PromClient) IsNil() bool {
+	if pc == nil {
+		return true
+	}
+
+	pc.RLock()
+	defer pc.RUnlock()
+
+	return pc.API == nil
+}
+
+func (pc *PromClient) Reset() {
+	pc.Lock()
+	defer pc.Unlock()
+
+	pc.ClusterName = ""
+	pc.API = nil
+}
diff --git a/src/server/config/prom_option.go b/src/server/config/prom_option.go
new file mode 100644
index 00000000..3dad6dae
--- /dev/null
+++ b/src/server/config/prom_option.go
@@ -0,0 +1,81 @@
+package config
+
+import "sync"
+
+type PromOption struct {
+	Url           string
+	BasicAuthUser string
+	BasicAuthPass string
+
+	Timeout     int64
+	DialTimeout int64
+
+	MaxIdleConnsPerHost int
+
+	Headers []string
+}
+
+func (po *PromOption) Equal(target PromOption) bool {
+	if po.Url != target.Url {
+		return false
+	}
+
+	if po.BasicAuthUser != target.BasicAuthUser {
+		return false
+	}
+
+	if po.BasicAuthPass != target.BasicAuthPass {
+		return false
+	}
+
+	if po.Timeout != target.Timeout {
+		return false
+	}
+
+	if po.DialTimeout != target.DialTimeout {
+		return false
+	}
+
+	if po.MaxIdleConnsPerHost != target.MaxIdleConnsPerHost {
+		return false
+	}
+
+	if len(po.Headers) != len(target.Headers) {
+		return false
+	}
+
+	for i := 0; i < len(po.Headers); i++ {
+		if po.Headers[i] != target.Headers[i] {
+			return false
+		}
+	}
+
+	return true
+}
+
+type PromOptionsStruct struct {
+	Data map[string]PromOption
+	sync.RWMutex
+}
+
+func (pos *PromOptionsStruct) Set(clusterName string, po PromOption) {
+	pos.Lock()
+	pos.Data[clusterName] = po
+	pos.Unlock()
+}
+
+func (pos *PromOptionsStruct) Sets(clusterName string, po PromOption) {
+	pos.Lock()
+	pos.Data = map[string]PromOption{clusterName: po}
+	pos.Unlock()
+}
+
+func (pos *PromOptionsStruct) Get(clusterName string) (PromOption, bool) {
+	pos.RLock()
+	defer pos.RUnlock()
+	ret, has := pos.Data[clusterName]
+	return ret, has
+}
+
+// Data key is cluster name
+var PromOptions = &PromOptionsStruct{Data: make(map[string]PromOption)}
diff --git a/src/server/config/reader.go b/src/server/config/reader.go
new file mode 100644
index 00000000..4098c8f2
--- /dev/null
+++ b/src/server/config/reader.go
@@ -0,0 +1,131 @@
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/didi/nightingale/v5/src/models"
+	"github.com/didi/nightingale/v5/src/pkg/prom"
+	"github.com/prometheus/client_golang/api"
+	"github.com/toolkits/pkg/logger"
+)
+
+func InitReader() error {
+	rf := strings.ToLower(strings.TrimSpace(C.ReaderFrom))
+	if rf == "" || rf == "config" {
+		return setClientFromPromOption(C.ClusterName, C.Reader)
+	}
+
+	if rf == "database" {
+		return initFromDatabase()
+	}
+
+	return fmt.Errorf("invalid configuration ReaderFrom: %s", rf)
+}
+
+func initFromDatabase() error {
+	go func() {
+		for {
+			loadFromDatabase()
+			time.Sleep(time.Second)
+		}
+	}()
+	return nil
+}
+
+func loadFromDatabase() {
+	cluster, err := models.AlertingEngineGetCluster(C.Heartbeat.Endpoint)
+	if err != nil {
+		logger.Errorf("failed to get current cluster, error: %v", err)
+		return
+	}
+
+	if cluster == "" {
+		ReaderClient.Reset()
+		logger.Warning("no datasource binded to me")
+		return
+	}
+
+	ckey := "prom." + cluster + ".option"
+	cval, err := models.ConfigsGet(ckey)
+	if err != nil {
+		logger.Errorf("failed to get ckey: %s, error: %v", ckey, err)
+		return
+	}
+
+	if cval == "" {
+		ReaderClient.Reset()
+		return
+	}
+
+	var po PromOption
+	err = json.Unmarshal([]byte(cval), &po)
+	if err != nil {
+		logger.Errorf("failed to unmarshal PromOption: %s", err)
+		return
+	}
+
+	if ReaderClient.IsNil() {
+		// first time
+		if err = setClientFromPromOption(cluster, po); err != nil {
+			logger.Errorf("failed to setClientFromPromOption: %v", err)
+			return
+		}
+
+		PromOptions.Sets(cluster, po)
+		return
+	}
+
+	localPo, has := PromOptions.Get(cluster)
+	if !has || !localPo.Equal(po) {
+		if err = setClientFromPromOption(cluster, po); err != nil {
+			logger.Errorf("failed to setClientFromPromOption: %v", err)
+			return
+		}
+
+		PromOptions.Sets(cluster, po)
+		return
+	}
+}
+
+func newClientFromPromOption(po PromOption) (api.Client, error) {
+	return api.NewClient(api.Config{
+		Address: po.Url,
+		RoundTripper: &http.Transport{
+			// TLSClientConfig: tlsConfig,
+			Proxy: http.ProxyFromEnvironment,
+			DialContext: (&net.Dialer{
+				Timeout: time.Duration(po.DialTimeout) * time.Millisecond,
+			}).DialContext,
+			ResponseHeaderTimeout: time.Duration(po.Timeout) * time.Millisecond,
+			MaxIdleConnsPerHost:   po.MaxIdleConnsPerHost,
+		},
+	})
+}
+
+func setClientFromPromOption(clusterName string, po PromOption) error {
+	if clusterName == "" {
+		return fmt.Errorf("argument clusterName is blank")
+	}
+
+	if po.Url == "" {
+		return fmt.Errorf("prometheus url is blank")
+	}
+
+	cli, err := newClientFromPromOption(po)
+	if err != nil {
+		return fmt.Errorf("failed to newClientFromPromOption: %v", err)
+	}
+
+	ReaderClient.Set(clusterName, prom.NewAPI(cli, prom.ClientOptions{
+		BasicAuthUser: po.BasicAuthUser,
+		BasicAuthPass: po.BasicAuthPass,
+		Headers:       po.Headers,
+	}))
+
+	return nil
+}
diff --git a/src/server/engine/engine.go b/src/server/engine/engine.go
index 7648e974..f15f5412 100644
--- a/src/server/engine/engine.go
+++ b/src/server/engine/engine.go
@@ -53,6 +53,10 @@ func Reload() {
 func reportQueueSize() {
 	for {
 		time.Sleep(time.Second)
-		promstat.GaugeAlertQueueSize.WithLabelValues(config.C.ClusterName).Set(float64(EventQueue.Len()))
+		clusterName := config.ReaderClient.GetClusterName()
+		if clusterName == "" {
+			continue
+		}
+		promstat.GaugeAlertQueueSize.WithLabelValues(clusterName).Set(float64(EventQueue.Len()))
 	}
 }
diff --git a/src/server/engine/notify.go b/src/server/engine/notify.go
index 213e5879..200981fc 100644
--- a/src/server/engine/notify.go
+++ b/src/server/engine/notify.go
@@ -101,12 +101,13 @@ func genNotice(event *models.AlertCurEvent) Notice {
 	return Notice{Event: event, Tpls: ntpls}
 }
 
-func alertingRedisPub(bs []byte) {
+func alertingRedisPub(clusterName string, bs []byte) {
+	channelKey := config.C.Alerting.RedisPub.ChannelPrefix + clusterName
 	// pub all alerts to redis
 	if config.C.Alerting.RedisPub.Enable {
-		err := storage.Redis.Publish(context.Background(), config.C.Alerting.RedisPub.ChannelKey, bs).Err()
+		err := storage.Redis.Publish(context.Background(), channelKey, bs).Err()
 		if err != nil {
-			logger.Errorf("event_notify: redis publish %s err: %v", config.C.Alerting.RedisPub.ChannelKey, err)
+			logger.Errorf("event_notify: redis publish %s err: %v", channelKey, err)
 		}
 	}
 }
@@ -249,7 +250,7 @@ func notify(event *models.AlertCurEvent) {
 		return
 	}
 
-	alertingRedisPub(stdinBytes)
+	alertingRedisPub(event.Cluster, stdinBytes)
 	alertingWebhook(event)
 
 	handleNotice(notice, stdinBytes)
diff --git a/src/server/engine/worker.go b/src/server/engine/worker.go
index f3ff2c04..448bbf9e 100644
--- a/src/server/engine/worker.go
+++ b/src/server/engine/worker.go
@@ -20,7 +20,6 @@ import (
 	"github.com/didi/nightingale/v5/src/server/config"
 	"github.com/didi/nightingale/v5/src/server/memsto"
 	"github.com/didi/nightingale/v5/src/server/naming"
-	"github.com/didi/nightingale/v5/src/server/reader"
 	promstat "github.com/didi/nightingale/v5/src/server/stat"
 )
 
@@ -167,16 +166,18 @@ func (r *RuleEval) Work() {
 		return
 	}
 
-	if reader.Client == nil {
-		logger.Error("reader.Client is nil")
+	if config.ReaderClient.IsNil() {
+		logger.Error("reader client is nil")
 		return
 	}
 
+	clusterName, readerClient := config.ReaderClient.Get()
+
 	var value model.Value
 	var err error
 	if r.rule.Algorithm == "" && (r.rule.Cate == "" || r.rule.Cate == "prometheus") {
 		var warnings prom.Warnings
-		value, warnings, err = reader.Client.Query(context.Background(), promql, time.Now())
+		value, warnings, err = readerClient.Query(context.Background(), promql, time.Now())
 		if err != nil {
 			logger.Errorf("rule_eval:%d promql:%s, error:%v", r.RuleID(), promql, err)
 			//notifyToMaintainer(err, "failed to query prometheus")
@@ -191,7 +192,7 @@ func (r *RuleEval) Work() {
 		logger.Debugf("rule_eval:%d promql:%s, value:%v", r.RuleID(), promql, value)
 	}
 
-	r.Judge(conv.ConvertVectors(value))
+	r.Judge(clusterName, conv.ConvertVectors(value))
 }
 
 type WorkersType struct {
@@ -306,10 +307,10 @@ func (ws *WorkersType) BuildRe(rids []int64) {
 	}
 }
 
-func (r *RuleEval) Judge(vectors []conv.Vector) {
+func (r *RuleEval) Judge(clusterName string, vectors []conv.Vector) {
 	now := time.Now().Unix()
 
-	alertingKeys, ruleExists := r.MakeNewEvent("inner", now, vectors)
+	alertingKeys, ruleExists := r.MakeNewEvent("inner", now, clusterName, vectors)
 	if !ruleExists {
 		return
 	}
@@ -318,7 +319,7 @@ func (r *RuleEval) Judge(vectors []conv.Vector) {
 	r.recoverRule(alertingKeys, now)
 }
 
-func (r *RuleEval) MakeNewEvent(from string, now int64, vectors []conv.Vector) (map[string]struct{}, bool) {
+func (r *RuleEval) MakeNewEvent(from string, now int64, clusterName string, vectors []conv.Vector) (map[string]struct{}, bool) {
 	// 有可能rule的一些配置已经发生变化，比如告警接收人、callbacks等
 	// 这些信息的修改是不会引起worker restart的，但是确实会影响告警处理逻辑
 	// 所以，这里直接从memsto.AlertRuleCache中获取并覆盖
@@ -394,7 +395,7 @@ func (r *RuleEval) MakeNewEvent(from string, now int64, vectors []conv.Vector) (
 		tagsArr := labelMapToArr(tagsMap)
 		sort.Strings(tagsArr)
 
-		event.Cluster = config.C.ClusterName
+		event.Cluster = clusterName
 		event.Cate = r.rule.Cate
 		event.Hash = hash
 		event.RuleId = r.rule.Id
@@ -583,7 +584,7 @@ func (r *RuleEval) pushEventToQueue(event *models.AlertCurEvent) {
 		r.fires.Set(event.Hash, event)
 	}
 
-	promstat.CounterAlertsTotal.WithLabelValues(config.C.ClusterName).Inc()
+	promstat.CounterAlertsTotal.WithLabelValues(event.Cluster).Inc()
 	LogEvent(event, "push_queue")
 	if !EventQueue.PushFront(event) {
 		logger.Warningf("event_push_queue: queue is full")
@@ -650,12 +651,12 @@ func (r RecordingRuleEval) Work() {
 		return
 	}
 
-	if reader.Client == nil {
-		log.Println("reader.Client is nil")
+	if config.ReaderClient.IsNil() {
+		log.Println("reader client is nil")
 		return
 	}
 
-	value, warnings, err := reader.Client.Query(context.Background(), promql, time.Now())
+	value, warnings, err := config.ReaderClient.GetCli().Query(context.Background(), promql, time.Now())
 	if err != nil {
 		logger.Errorf("recording_rule_eval:%d promql:%s, error:%v", r.RuleID(), promql, err)
 		return
diff --git a/src/server/idents/idents.go b/src/server/idents/idents.go
index aa69a5da..23922b51 100644
--- a/src/server/idents/idents.go
+++ b/src/server/idents/idents.go
@@ -41,6 +41,10 @@ func toRedis() {
 		return
 	}
 
+	if config.ReaderClient.IsNil() {
+		return
+	}
+
 	now := time.Now().Unix()
 
 	// clean old idents
@@ -49,7 +53,7 @@ func toRedis() {
 			Idents.Remove(key)
 		} else {
 			// use now as timestamp to redis
-			err := storage.Redis.HSet(context.Background(), redisKey(config.C.ClusterName), key, now).Err()
+			err := storage.Redis.HSet(context.Background(), redisKey(config.ReaderClient.GetClusterName()), key, now).Err()
 			if err != nil {
 				logger.Errorf("redis hset idents failed: %v", err)
 			}
@@ -103,8 +107,14 @@ func pushMetrics() {
 		return
 	}
 
+	clusterName := config.ReaderClient.GetClusterName()
+	if clusterName == "" {
+		logger.Warning("cluster name is blank")
+		return
+	}
+
 	// get all the target heartbeat timestamp
-	ret, err := storage.Redis.HGetAll(context.Background(), redisKey(config.C.ClusterName)).Result()
+	ret, err := storage.Redis.HGetAll(context.Background(), redisKey(clusterName)).Result()
 	if err != nil {
 		logger.Errorf("handle_idents: redis hgetall fail: %v", err)
 		return
@@ -121,7 +131,7 @@ func pushMetrics() {
 		}
 
 		if now-clock > dur {
-			clearDeadIdent(context.Background(), config.C.ClusterName, ident)
+			clearDeadIdent(context.Background(), clusterName, ident)
 		} else {
 			actives[ident] = struct{}{}
 		}
@@ -153,7 +163,7 @@ func pushMetrics() {
 		if !has {
 			// target not exists
 			target = &models.Target{
-				Cluster:  config.C.ClusterName,
+				Cluster:  clusterName,
 				Ident:    active,
 				Tags:     "",
 				TagsJSON: []string{},
diff --git a/src/server/memsto/alert_mute_cache.go b/src/server/memsto/alert_mute_cache.go
index 582a477d..723a20d7 100644
--- a/src/server/memsto/alert_mute_cache.go
+++ b/src/server/memsto/alert_mute_cache.go
@@ -27,6 +27,15 @@ var AlertMuteCache = AlertMuteCacheType{
 	mutes:           make(map[int64][]*models.AlertMute),
 }
 
+func (amc *AlertMuteCacheType) Reset() {
+	amc.Lock()
+	defer amc.Unlock()
+
+	amc.statTotal = -1
+	amc.statLastUpdated = -1
+	amc.mutes = make(map[int64][]*models.AlertMute)
+}
+
 func (amc *AlertMuteCacheType) StatChanged(total, lastUpdated int64) bool {
 	if amc.statTotal == total && amc.statLastUpdated == lastUpdated {
 		return false
@@ -90,19 +99,26 @@ func loopSyncAlertMutes() {
 func syncAlertMutes() error {
 	start := time.Now()
 
-	stat, err := models.AlertMuteStatistics(config.C.ClusterName)
+	clusterName := config.ReaderClient.GetClusterName()
+	if clusterName == "" {
+		AlertMuteCache.Reset()
+		logger.Warning("cluster name is blank")
+		return nil
+	}
+
+	stat, err := models.AlertMuteStatistics(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec AlertMuteStatistics")
 	}
 
 	if !AlertMuteCache.StatChanged(stat.Total, stat.LastUpdated) {
-		promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_alert_mutes").Set(0)
-		promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_alert_mutes").Set(0)
+		promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_alert_mutes").Set(0)
+		promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_alert_mutes").Set(0)
 		logger.Debug("alert mutes not changed")
 		return nil
 	}
 
-	lst, err := models.AlertMuteGetsByCluster(config.C.ClusterName)
+	lst, err := models.AlertMuteGetsByCluster(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec AlertMuteGetsByCluster")
 	}
@@ -122,8 +138,8 @@ func syncAlertMutes() error {
 	AlertMuteCache.Set(oks, stat.Total, stat.LastUpdated)
 
 	ms := time.Since(start).Milliseconds()
-	promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_alert_mutes").Set(float64(ms))
-	promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_alert_mutes").Set(float64(len(lst)))
+	promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_alert_mutes").Set(float64(ms))
+	promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_alert_mutes").Set(float64(len(lst)))
 	logger.Infof("timer: sync mutes done, cost: %dms, number: %d", ms, len(lst))
 
 	return nil
diff --git a/src/server/memsto/alert_rule_cache.go b/src/server/memsto/alert_rule_cache.go
index d412d985..c4902a9d 100644
--- a/src/server/memsto/alert_rule_cache.go
+++ b/src/server/memsto/alert_rule_cache.go
@@ -27,6 +27,15 @@ var AlertRuleCache = AlertRuleCacheType{
 	rules:           make(map[int64]*models.AlertRule),
 }
 
+func (arc *AlertRuleCacheType) Reset() {
+	arc.Lock()
+	defer arc.Unlock()
+
+	arc.statTotal = -1
+	arc.statLastUpdated = -1
+	arc.rules = make(map[int64]*models.AlertRule)
+}
+
 func (arc *AlertRuleCacheType) StatChanged(total, lastUpdated int64) bool {
 	if arc.statTotal == total && arc.statLastUpdated == lastUpdated {
 		return false
@@ -87,19 +96,26 @@ func loopSyncAlertRules() {
 func syncAlertRules() error {
 	start := time.Now()
 
-	stat, err := models.AlertRuleStatistics(config.C.ClusterName)
+	clusterName := config.ReaderClient.GetClusterName()
+	if clusterName == "" {
+		AlertRuleCache.Reset()
+		logger.Warning("cluster name is blank")
+		return nil
+	}
+
+	stat, err := models.AlertRuleStatistics(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec AlertRuleStatistics")
 	}
 
 	if !AlertRuleCache.StatChanged(stat.Total, stat.LastUpdated) {
-		promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_alert_rules").Set(0)
-		promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_alert_rules").Set(0)
+		promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_alert_rules").Set(0)
+		promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_alert_rules").Set(0)
 		logger.Debug("alert rules not changed")
 		return nil
 	}
 
-	lst, err := models.AlertRuleGetsByCluster(config.C.ClusterName)
+	lst, err := models.AlertRuleGetsByCluster(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec AlertRuleGetsByCluster")
 	}
@@ -112,8 +128,8 @@ func syncAlertRules() error {
 	AlertRuleCache.Set(m, stat.Total, stat.LastUpdated)
 
 	ms := time.Since(start).Milliseconds()
-	promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_alert_rules").Set(float64(ms))
-	promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_alert_rules").Set(float64(len(m)))
+	promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_alert_rules").Set(float64(ms))
+	promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_alert_rules").Set(float64(len(m)))
 	logger.Infof("timer: sync rules done, cost: %dms, number: %d", ms, len(m))
 
 	return nil
diff --git a/src/server/memsto/alert_subsribe_cache.go b/src/server/memsto/alert_subsribe_cache.go
index 9f319e14..4b2a11e4 100644
--- a/src/server/memsto/alert_subsribe_cache.go
+++ b/src/server/memsto/alert_subsribe_cache.go
@@ -27,6 +27,15 @@ var AlertSubscribeCache = AlertSubscribeCacheType{
 	subs:            make(map[int64][]*models.AlertSubscribe),
 }
 
+func (c *AlertSubscribeCacheType) Reset() {
+	c.Lock()
+	defer c.Unlock()
+
+	c.statTotal = -1
+	c.statLastUpdated = -1
+	c.subs = make(map[int64][]*models.AlertSubscribe)
+}
+
 func (c *AlertSubscribeCacheType) StatChanged(total, lastUpdated int64) bool {
 	if c.statTotal == total && c.statLastUpdated == lastUpdated {
 		return false
@@ -93,19 +102,26 @@ func loopSyncAlertSubscribes() {
 func syncAlertSubscribes() error {
 	start := time.Now()
 
-	stat, err := models.AlertSubscribeStatistics(config.C.ClusterName)
+	clusterName := config.ReaderClient.GetClusterName()
+	if clusterName == "" {
+		AlertSubscribeCache.Reset()
+		logger.Warning("cluster name is blank")
+		return nil
+	}
+
+	stat, err := models.AlertSubscribeStatistics(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec AlertSubscribeStatistics")
 	}
 
 	if !AlertSubscribeCache.StatChanged(stat.Total, stat.LastUpdated) {
-		promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_alert_subscribes").Set(0)
-		promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_alert_subscribes").Set(0)
+		promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_alert_subscribes").Set(0)
+		promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_alert_subscribes").Set(0)
 		logger.Debug("alert subscribes not changed")
 		return nil
 	}
 
-	lst, err := models.AlertSubscribeGetsByCluster(config.C.ClusterName)
+	lst, err := models.AlertSubscribeGetsByCluster(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec AlertSubscribeGetsByCluster")
 	}
@@ -125,8 +141,8 @@ func syncAlertSubscribes() error {
 	AlertSubscribeCache.Set(subs, stat.Total, stat.LastUpdated)
 
 	ms := time.Since(start).Milliseconds()
-	promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_alert_subscribes").Set(float64(ms))
-	promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_alert_subscribes").Set(float64(len(lst)))
+	promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_alert_subscribes").Set(float64(ms))
+	promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_alert_subscribes").Set(float64(len(lst)))
 	logger.Infof("timer: sync subscribes done, cost: %dms, number: %d", ms, len(lst))
 
 	return nil
diff --git a/src/server/memsto/busi_group_cache.go b/src/server/memsto/busi_group_cache.go
index 947baaa5..a32b641e 100644
--- a/src/server/memsto/busi_group_cache.go
+++ b/src/server/memsto/busi_group_cache.go
@@ -79,9 +79,14 @@ func syncBusiGroups() error {
 		return errors.WithMessage(err, "failed to exec BusiGroupStatistics")
 	}
 
+	clusterName := config.ReaderClient.GetClusterName()
+
 	if !BusiGroupCache.StatChanged(stat.Total, stat.LastUpdated) {
-		promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_busi_groups").Set(0)
-		promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_busi_groups").Set(0)
+		if clusterName != "" {
+			promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_busi_groups").Set(0)
+			promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_busi_groups").Set(0)
+		}
+
 		logger.Debug("busi_group not changed")
 		return nil
 	}
@@ -94,8 +99,11 @@ func syncBusiGroups() error {
 	BusiGroupCache.Set(m, stat.Total, stat.LastUpdated)
 
 	ms := time.Since(start).Milliseconds()
-	promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_busi_groups").Set(float64(ms))
-	promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_busi_groups").Set(float64(len(m)))
+	if clusterName != "" {
+		promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_busi_groups").Set(float64(ms))
+		promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_busi_groups").Set(float64(len(m)))
+	}
+
 	logger.Infof("timer: sync busi groups done, cost: %dms, number: %d", ms, len(m))
 
 	return nil
diff --git a/src/server/memsto/recording_rule_cache.go b/src/server/memsto/recording_rule_cache.go
index 61305de1..7670bd28 100644
--- a/src/server/memsto/recording_rule_cache.go
+++ b/src/server/memsto/recording_rule_cache.go
@@ -26,6 +26,15 @@ var RecordingRuleCache = RecordingRuleCacheType{
 	rules:           make(map[int64]*models.RecordingRule),
 }
 
+func (rrc *RecordingRuleCacheType) Reset() {
+	rrc.Lock()
+	defer rrc.Unlock()
+
+	rrc.statTotal = -1
+	rrc.statLastUpdated = -1
+	rrc.rules = make(map[int64]*models.RecordingRule)
+}
+
 func (rrc *RecordingRuleCacheType) StatChanged(total, lastUpdated int64) bool {
 	if rrc.statTotal == total && rrc.statLastUpdated == lastUpdated {
 		return false
@@ -86,19 +95,26 @@ func loopSyncRecordingRules() {
 func syncRecordingRules() error {
 	start := time.Now()
 
-	stat, err := models.RecordingRuleStatistics(config.C.ClusterName)
+	clusterName := config.ReaderClient.GetClusterName()
+	if clusterName == "" {
+		RecordingRuleCache.Reset()
+		logger.Warning("cluster name is blank")
+		return nil
+	}
+
+	stat, err := models.RecordingRuleStatistics(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec RecordingRuleStatistics")
 	}
 
 	if !RecordingRuleCache.StatChanged(stat.Total, stat.LastUpdated) {
-		promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_recording_rules").Set(0)
-		promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_recording_rules").Set(0)
+		promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_recording_rules").Set(0)
+		promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_recording_rules").Set(0)
 		logger.Debug("recoding rules not changed")
 		return nil
 	}
 
-	lst, err := models.RecordingRuleGetsByCluster(config.C.ClusterName)
+	lst, err := models.RecordingRuleGetsByCluster(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec RecordingRuleGetsByCluster")
 	}
@@ -111,8 +127,8 @@ func syncRecordingRules() error {
 	RecordingRuleCache.Set(m, stat.Total, stat.LastUpdated)
 
 	ms := time.Since(start).Milliseconds()
-	promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_recording_rules").Set(float64(ms))
-	promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_recording_rules").Set(float64(len(m)))
+	promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_recording_rules").Set(float64(ms))
+	promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_recording_rules").Set(float64(len(m)))
 	logger.Infof("timer: sync recording rules done, cost: %dms, number: %d", ms, len(m))
 
 	return nil
diff --git a/src/server/memsto/target_cache.go b/src/server/memsto/target_cache.go
index 1cc77644..9e5e04b4 100644
--- a/src/server/memsto/target_cache.go
+++ b/src/server/memsto/target_cache.go
@@ -31,6 +31,15 @@ var TargetCache = TargetCacheType{
 	targets:         make(map[string]*models.Target),
 }
 
+func (tc *TargetCacheType) Reset() {
+	tc.Lock()
+	defer tc.Unlock()
+
+	tc.statTotal = -1
+	tc.statLastUpdated = -1
+	tc.targets = make(map[string]*models.Target)
+}
+
 func (tc *TargetCacheType) StatChanged(total, lastUpdated int64) bool {
 	if tc.statTotal == total && tc.statLastUpdated == lastUpdated {
 		return false
@@ -94,19 +103,26 @@ func loopSyncTargets() {
 func syncTargets() error {
 	start := time.Now()
 
-	stat, err := models.TargetStatistics(config.C.ClusterName)
+	clusterName := config.ReaderClient.GetClusterName()
+	if clusterName == "" {
+		TargetCache.Reset()
+		logger.Warning("cluster name is blank")
+		return nil
+	}
+
+	stat, err := models.TargetStatistics(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec TargetStatistics")
 	}
 
 	if !TargetCache.StatChanged(stat.Total, stat.LastUpdated) {
-		promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_targets").Set(0)
-		promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_targets").Set(0)
+		promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_targets").Set(0)
+		promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_targets").Set(0)
 		logger.Debug("targets not changed")
 		return nil
 	}
 
-	lst, err := models.TargetGetsByCluster(config.C.ClusterName)
+	lst, err := models.TargetGetsByCluster(clusterName)
 	if err != nil {
 		return errors.WithMessage(err, "failed to exec TargetGetsByCluster")
 	}
@@ -129,8 +145,8 @@ func syncTargets() error {
 	TargetCache.Set(m, stat.Total, stat.LastUpdated)
 
 	ms := time.Since(start).Milliseconds()
-	promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_targets").Set(float64(ms))
-	promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_targets").Set(float64(len(lst)))
+	promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_targets").Set(float64(ms))
+	promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_targets").Set(float64(len(lst)))
 	logger.Infof("timer: sync targets done, cost: %dms, number: %d", ms, len(lst))
 
 	return nil
diff --git a/src/server/memsto/user_cache.go b/src/server/memsto/user_cache.go
index 4cee8c2b..1d1b7fb7 100644
--- a/src/server/memsto/user_cache.go
+++ b/src/server/memsto/user_cache.go
@@ -124,9 +124,14 @@ func syncUsers() error {
 		return errors.WithMessage(err, "failed to exec UserStatistics")
 	}
 
+	clusterName := config.ReaderClient.GetClusterName()
+
 	if !UserCache.StatChanged(stat.Total, stat.LastUpdated) {
-		promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_users").Set(0)
-		promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_users").Set(0)
+		if clusterName != "" {
+			promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_users").Set(0)
+			promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_users").Set(0)
+		}
+
 		logger.Debug("users not changed")
 		return nil
 	}
@@ -144,8 +149,11 @@ func syncUsers() error {
 	UserCache.Set(m, stat.Total, stat.LastUpdated)
 
 	ms := time.Since(start).Milliseconds()
-	promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_users").Set(float64(ms))
-	promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_users").Set(float64(len(m)))
+	if clusterName != "" {
+		promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_users").Set(float64(ms))
+		promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_users").Set(float64(len(m)))
+	}
+
 	logger.Infof("timer: sync users done, cost: %dms, number: %d", ms, len(m))
 
 	return nil
diff --git a/src/server/memsto/user_group_cache.go b/src/server/memsto/user_group_cache.go
index 13ca4843..4d9ec2b9 100644
--- a/src/server/memsto/user_group_cache.go
+++ b/src/server/memsto/user_group_cache.go
@@ -106,9 +106,14 @@ func syncUserGroups() error {
 		return errors.WithMessage(err, "failed to exec UserGroupStatistics")
 	}
 
+	clusterName := config.ReaderClient.GetClusterName()
+
 	if !UserGroupCache.StatChanged(stat.Total, stat.LastUpdated) {
-		promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_user_groups").Set(0)
-		promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_user_groups").Set(0)
+		if clusterName != "" {
+			promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_user_groups").Set(0)
+			promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_user_groups").Set(0)
+		}
+
 		logger.Debug("user_group not changed")
 		return nil
 	}
@@ -145,8 +150,11 @@ func syncUserGroups() error {
 	UserGroupCache.Set(m, stat.Total, stat.LastUpdated)
 
 	ms := time.Since(start).Milliseconds()
-	promstat.GaugeCronDuration.WithLabelValues(config.C.ClusterName, "sync_user_groups").Set(float64(ms))
-	promstat.GaugeSyncNumber.WithLabelValues(config.C.ClusterName, "sync_user_groups").Set(float64(len(m)))
+	if clusterName != "" {
+		promstat.GaugeCronDuration.WithLabelValues(clusterName, "sync_user_groups").Set(float64(ms))
+		promstat.GaugeSyncNumber.WithLabelValues(clusterName, "sync_user_groups").Set(float64(len(m)))
+	}
+
 	logger.Infof("timer: sync user groups done, cost: %dms, number: %d", ms, len(m))
 
 	return nil
diff --git a/src/server/reader/reader.go b/src/server/reader/reader.go
deleted file mode 100644
index c7b27a64..00000000
--- a/src/server/reader/reader.go
+++ /dev/null
@@ -1,177 +0,0 @@
-package reader
-
-import (
-	"encoding/json"
-	"fmt"
-	"net"
-	"net/http"
-	"strings"
-	"time"
-
-	"github.com/didi/nightingale/v5/src/models"
-	"github.com/didi/nightingale/v5/src/pkg/prom"
-	"github.com/didi/nightingale/v5/src/server/config"
-	"github.com/prometheus/client_golang/api"
-	"github.com/toolkits/pkg/logger"
-)
-
-var Client prom.API
-var LocalPromOption PromOption
-
-func Init() error {
-	rf := strings.ToLower(strings.TrimSpace(config.C.ReaderFrom))
-	if rf == "" || rf == "config" {
-		return initFromConfig()
-	}
-
-	if rf == "database" {
-		return initFromDatabase()
-	}
-
-	return fmt.Errorf("invalid configuration ReaderFrom: %s", rf)
-}
-
-func initFromConfig() error {
-	opts := config.C.Reader
-
-	if opts.Url == "" {
-		logger.Warning("reader url is blank")
-		return nil
-	}
-
-	cli, err := api.NewClient(api.Config{
-		Address: opts.Url,
-		RoundTripper: &http.Transport{
-			// TLSClientConfig: tlsConfig,
-			Proxy: http.ProxyFromEnvironment,
-			DialContext: (&net.Dialer{
-				Timeout: time.Duration(opts.DialTimeout) * time.Millisecond,
-			}).DialContext,
-			ResponseHeaderTimeout: time.Duration(opts.Timeout) * time.Millisecond,
-			MaxIdleConnsPerHost:   opts.MaxIdleConnsPerHost,
-		},
-	})
-
-	if err != nil {
-		return err
-	}
-
-	Client = prom.NewAPI(cli, prom.ClientOptions{
-		BasicAuthUser: opts.BasicAuthUser,
-		BasicAuthPass: opts.BasicAuthPass,
-		Headers:       opts.Headers,
-	})
-
-	return nil
-}
-
-func initFromDatabase() error {
-	go func() {
-		for {
-			loadFromDatabase()
-			time.Sleep(time.Second)
-		}
-	}()
-	return nil
-}
-
-type PromOption struct {
-	Url                 string
-	User                string
-	Pass                string
-	Headers             []string
-	Timeout             int64
-	DialTimeout         int64
-	MaxIdleConnsPerHost int
-}
-
-func (po *PromOption) Equal(target PromOption) bool {
-	if po.Url != target.Url {
-		return false
-	}
-
-	if po.User != target.User {
-		return false
-	}
-
-	if po.Pass != target.Pass {
-		return false
-	}
-
-	if po.Timeout != target.Timeout {
-		return false
-	}
-
-	if po.DialTimeout != target.DialTimeout {
-		return false
-	}
-
-	if po.MaxIdleConnsPerHost != target.MaxIdleConnsPerHost {
-		return false
-	}
-
-	if len(po.Headers) != len(target.Headers) {
-		return false
-	}
-
-	for i := 0; i < len(po.Headers); i++ {
-		if po.Headers[i] != target.Headers[i] {
-			return false
-		}
-	}
-
-	return true
-}
-
-func loadFromDatabase() {
-	cluster, err := models.AlertingEngineGetCluster(config.C.Heartbeat.Endpoint)
-	if err != nil {
-		logger.Errorf("failed to get current cluster, error: %v", err)
-		return
-	}
-
-	ckey := "prom." + cluster + ".option"
-	cval, err := models.ConfigsGet(ckey)
-	if err != nil {
-		logger.Errorf("failed to get ckey: %s, error: %v", ckey, err)
-		return
-	}
-
-	if cval == "" {
-		Client = nil
-		return
-	}
-
-	var po PromOption
-	err = json.Unmarshal([]byte(cval), &po)
-	if err != nil {
-		logger.Errorf("failed to unmarshal PromOption: %s", err)
-		return
-	}
-
-	if Client == nil || !LocalPromOption.Equal(po) {
-		cli, err := api.NewClient(api.Config{
-			Address: po.Url,
-			RoundTripper: &http.Transport{
-				// TLSClientConfig: tlsConfig,
-				Proxy: http.ProxyFromEnvironment,
-				DialContext: (&net.Dialer{
-					Timeout: time.Duration(po.DialTimeout) * time.Millisecond,
-				}).DialContext,
-				ResponseHeaderTimeout: time.Duration(po.Timeout) * time.Millisecond,
-				MaxIdleConnsPerHost:   po.MaxIdleConnsPerHost,
-			},
-		})
-
-		if err != nil {
-			logger.Errorf("failed to NewPromClient: %v", err)
-			return
-		}
-
-		Client = prom.NewAPI(cli, prom.ClientOptions{
-			BasicAuthUser: po.User,
-			BasicAuthPass: po.Pass,
-			Headers:       po.Headers,
-		})
-	}
-}
diff --git a/src/server/router/router_datadog.go b/src/server/router/router_datadog.go
index 01e79267..ceb8cc82 100644
--- a/src/server/router/router_datadog.go
+++ b/src/server/router/router_datadog.go
@@ -269,7 +269,10 @@ func datadogSeries(c *gin.Context) {
 	}
 
 	if succ > 0 {
-		promstat.CounterSampleTotal.WithLabelValues(config.C.ClusterName, "datadog").Add(float64(succ))
+		cn := config.ReaderClient.GetClusterName()
+		if cn != "" {
+			promstat.CounterSampleTotal.WithLabelValues(cn, "datadog").Add(float64(succ))
+		}
 		idents.Idents.MSet(ids)
 	}
 
diff --git a/src/server/router/router_event.go b/src/server/router/router_event.go
index ee4ec7eb..b5aaa5bf 100644
--- a/src/server/router/router_event.go
+++ b/src/server/router/router_event.go
@@ -63,7 +63,11 @@ func pushEventToQueue(c *gin.Context) {
 	event.NotifyChannels = strings.Join(event.NotifyChannelsJSON, " ")
 	event.NotifyGroups = strings.Join(event.NotifyGroupsJSON, " ")
 
-	promstat.CounterAlertsTotal.WithLabelValues(config.C.ClusterName).Inc()
+	cn := config.ReaderClient.GetClusterName()
+	if cn != "" {
+		promstat.CounterAlertsTotal.WithLabelValues(cn).Inc()
+	}
+
 	engine.LogEvent(event, "http_push_queue")
 	if !engine.EventQueue.PushFront(event) {
 		msg := fmt.Sprintf("event:%+v push_queue err: queue is full", event)
@@ -77,6 +81,7 @@ type eventForm struct {
 	Alert   bool          `json:"alert"`
 	Vectors []conv.Vector `json:"vectors"`
 	RuleId  int64         `json:"rule_id"`
+	Cluster string        `json:"cluster"`
 }
 
 func judgeEvent(c *gin.Context) {
@@ -86,7 +91,7 @@ func judgeEvent(c *gin.Context) {
 	if !exists {
 		ginx.Bomb(200, "rule not exists")
 	}
-	re.Judge(form.Vectors)
+	re.Judge(form.Cluster, form.Vectors)
 	ginx.NewRender(c).Message(nil)
 }
 
@@ -102,7 +107,7 @@ func makeEvent(c *gin.Context) {
 		}
 
 		if events[i].Alert {
-			go re.MakeNewEvent("http", now, events[i].Vectors)
+			go re.MakeNewEvent("http", now, events[i].Cluster, events[i].Vectors)
 		} else {
 			for _, vector := range events[i].Vectors {
 				hash := str.MD5(fmt.Sprintf("%d_%s", events[i].RuleId, vector.Key))
diff --git a/src/server/router/router_openfalcon.go b/src/server/router/router_openfalcon.go
index 4eb885b6..c8943955 100644
--- a/src/server/router/router_openfalcon.go
+++ b/src/server/router/router_openfalcon.go
@@ -214,7 +214,11 @@ func falconPush(c *gin.Context) {
 	}
 
 	if succ > 0 {
-		promstat.CounterSampleTotal.WithLabelValues(config.C.ClusterName, "openfalcon").Add(float64(succ))
+		cn := config.ReaderClient.GetClusterName()
+		if cn != "" {
+			promstat.CounterSampleTotal.WithLabelValues(cn, "openfalcon").Add(float64(succ))
+		}
+
 		idents.Idents.MSet(ids)
 	}
 
diff --git a/src/server/router/router_opentsdb.go b/src/server/router/router_opentsdb.go
index 27d1d37e..c7b167a3 100644
--- a/src/server/router/router_opentsdb.go
+++ b/src/server/router/router_opentsdb.go
@@ -208,7 +208,10 @@ func handleOpenTSDB(c *gin.Context) {
 	}
 
 	if succ > 0 {
-		promstat.CounterSampleTotal.WithLabelValues(config.C.ClusterName, "opentsdb").Add(float64(succ))
+		cn := config.ReaderClient.GetClusterName()
+		if cn != "" {
+			promstat.CounterSampleTotal.WithLabelValues(cn, "opentsdb").Add(float64(succ))
+		}
 		idents.Idents.MSet(ids)
 	}
 
diff --git a/src/server/router/router_prom.go b/src/server/router/router_prom.go
index 7d2b57dd..30601457 100644
--- a/src/server/router/router_prom.go
+++ b/src/server/router/router_prom.go
@@ -17,7 +17,6 @@ import (
 	"github.com/didi/nightingale/v5/src/server/config"
 	"github.com/didi/nightingale/v5/src/server/idents"
 	"github.com/didi/nightingale/v5/src/server/memsto"
-	"github.com/didi/nightingale/v5/src/server/reader"
 	promstat "github.com/didi/nightingale/v5/src/server/stat"
 	"github.com/didi/nightingale/v5/src/server/writer"
 )
@@ -38,12 +37,12 @@ func queryPromql(c *gin.Context) {
 	var f promqlForm
 	ginx.BindJSON(c, &f)
 
-	if reader.Client == nil {
-		c.String(500, "reader.Client is nil")
+	if config.ReaderClient.IsNil() {
+		c.String(500, "reader client is nil")
 		return
 	}
 
-	value, warnings, err := reader.Client.Query(c.Request.Context(), f.PromQL, time.Now())
+	value, warnings, err := config.ReaderClient.GetCli().Query(c.Request.Context(), f.PromQL, time.Now())
 	if err != nil {
 		c.String(500, "promql:%s error:%v", f.PromQL, err)
 		return
@@ -147,7 +146,11 @@ func remoteWrite(c *gin.Context) {
 		writer.Writers.PushSample(metric, req.Timeseries[i])
 	}
 
-	promstat.CounterSampleTotal.WithLabelValues(config.C.ClusterName, "prometheus").Add(float64(count))
+	cn := config.ReaderClient.GetClusterName()
+	if cn != "" {
+		promstat.CounterSampleTotal.WithLabelValues(cn, "prometheus").Add(float64(count))
+	}
+
 	idents.Idents.MSet(ids)
 }
 
diff --git a/src/server/server.go b/src/server/server.go
index 32035865..46432b5f 100644
--- a/src/server/server.go
+++ b/src/server/server.go
@@ -18,7 +18,6 @@ import (
 	"github.com/didi/nightingale/v5/src/server/idents"
 	"github.com/didi/nightingale/v5/src/server/memsto"
 	"github.com/didi/nightingale/v5/src/server/naming"
-	"github.com/didi/nightingale/v5/src/server/reader"
 	"github.com/didi/nightingale/v5/src/server/router"
 	"github.com/didi/nightingale/v5/src/server/stat"
 	"github.com/didi/nightingale/v5/src/server/usage"
@@ -125,7 +124,7 @@ func (s Server) initialize() (func(), error) {
 	}
 
 	// init prometheus remote reader
-	if err = reader.Init(); err != nil {
+	if err = config.InitReader(); err != nil {
 		return fns.Ret(), err
 	}
 
diff --git a/src/server/usage/usage.go b/src/server/usage/usage.go
index 66dfa578..3fd0e6ac 100644
--- a/src/server/usage/usage.go
+++ b/src/server/usage/usage.go
@@ -2,7 +2,6 @@ package usage
 
 import (
 	"bytes"
-	"context"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -12,8 +11,6 @@ import (
 
 	"github.com/didi/nightingale/v5/src/models"
 	"github.com/didi/nightingale/v5/src/pkg/version"
-	"github.com/didi/nightingale/v5/src/server/common/conv"
-	"github.com/didi/nightingale/v5/src/server/reader"
 )
 
 const (
@@ -29,28 +26,6 @@ type Usage struct {
 	Version    string  `json:"version"`
 }
 
-func getSamples() (float64, error) {
-	if reader.Client == nil {
-		return 0, fmt.Errorf("reader.Client is nil")
-	}
-
-	value, warns, err := reader.Client.Query(context.Background(), request, time.Now())
-	if err != nil {
-		return 0, err
-	}
-
-	if len(warns) > 0 {
-		return 0, fmt.Errorf("occur some warnings: %v", warns)
-	}
-
-	lst := conv.ConvertVectors(value)
-	if len(lst) == 0 {
-		return 0, fmt.Errorf("convert result is empty")
-	}
-
-	return lst[0].Value, nil
-}
-
 func Report() {
 	for {
 		time.Sleep(time.Minute * 10)
@@ -59,7 +34,6 @@ func Report() {
 }
 
 func report() {
-	// sps, _ := getSamples()
 	tnum, err := models.TargetTotalCount()
 	if err != nil {
 		return
diff --git a/src/server/writer/writer.go b/src/server/writer/writer.go
index 7d8b8723..d5de8099 100644
--- a/src/server/writer/writer.go
+++ b/src/server/writer/writer.go
@@ -49,7 +49,10 @@ func (w WriterType) Write(index int, items []*prompb.TimeSeries, headers ...map[
 
 	start := time.Now()
 	defer func() {
-		promstat.ForwardDuration.WithLabelValues(config.C.ClusterName, fmt.Sprint(index)).Observe(time.Since(start).Seconds())
+		cn := config.ReaderClient.GetClusterName()
+		if cn != "" {
+			promstat.ForwardDuration.WithLabelValues(cn, fmt.Sprint(index)).Observe(time.Since(start).Seconds())
+		}
 	}()
 
 	req := &prompb.WriteRequest{
@@ -240,11 +243,16 @@ func Init(opts []config.WriterOptions, globalOpt config.WriterGlobalOpt) error {
 }
 
 func reportChanSize() {
+	clusterName := config.ReaderClient.GetClusterName()
+	if clusterName == "" {
+		return
+	}
+
 	for {
 		time.Sleep(time.Second * 3)
 		for i, c := range Writers.chans {
 			size := len(c)
-			promstat.GaugeSampleQueueSize.WithLabelValues(config.C.ClusterName, fmt.Sprint(i)).Set(float64(size))
+			promstat.GaugeSampleQueueSize.WithLabelValues(clusterName, fmt.Sprint(i)).Set(float64(size))
 		}
 	}
 }