diff --git a/go/greptime/v1/meta/heartbeat.pb.go b/go/greptime/v1/meta/heartbeat.pb.go
index 4c1dea9..b3e4b16 100644
--- a/go/greptime/v1/meta/heartbeat.pb.go
+++ b/go/greptime/v1/meta/heartbeat.pb.go
@@ -37,8 +37,8 @@ type HeartbeatRequest struct {
 	// Region stats on this node
 	RegionStats []*RegionStat `protobuf:"bytes,6,rep,name=region_stats,json=regionStats,proto3" json:"region_stats,omitempty"`
 	// Follower nodes and stats, empty on follower nodes
-	ReplicaStats    []*ReplicaStat    `protobuf:"bytes,7,rep,name=replica_stats,json=replicaStats,proto3" json:"replica_stats,omitempty"`
-	MailboxMessages []*MailboxMessage `protobuf:"bytes,8,rep,name=mailbox_messages,json=mailboxMessages,proto3" json:"mailbox_messages,omitempty"`
+	ReplicaStats   []*ReplicaStat  `protobuf:"bytes,7,rep,name=replica_stats,json=replicaStats,proto3" json:"replica_stats,omitempty"`
+	MailboxMessage *MailboxMessage `protobuf:"bytes,8,opt,name=mailbox_message,json=mailboxMessage,proto3" json:"mailbox_message,omitempty"`
 }
 
 func (x *HeartbeatRequest) Reset() {
@@ -122,9 +122,9 @@ func (x *HeartbeatRequest) GetReplicaStats() []*ReplicaStat {
 	return nil
 }
 
-func (x *HeartbeatRequest) GetMailboxMessages() []*MailboxMessage {
+func (x *HeartbeatRequest) GetMailboxMessage() *MailboxMessage {
 	if x != nil {
-		return x.MailboxMessages
+		return x.MailboxMessage
 	}
 	return nil
 }
@@ -415,8 +415,8 @@ type HeartbeatResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Header          *ResponseHeader   `protobuf:"bytes,1,opt,name=header,proto3" json:"header,omitempty"`
-	MailboxMessages []*MailboxMessage `protobuf:"bytes,2,rep,name=mailbox_messages,json=mailboxMessages,proto3" json:"mailbox_messages,omitempty"`
+	Header         *ResponseHeader `protobuf:"bytes,1,opt,name=header,proto3" json:"header,omitempty"`
+	MailboxMessage *MailboxMessage `protobuf:"bytes,2,opt,name=mailbox_message,json=mailboxMessage,proto3" json:"mailbox_message,omitempty"`
 }
 
 func (x *HeartbeatResponse) Reset() {
@@ -458,9 +458,9 @@ func (x *HeartbeatResponse) GetHeader() *ResponseHeader {
 	return nil
 }
 
-func (x *HeartbeatResponse) GetMailboxMessages() []*MailboxMessage {
+func (x *HeartbeatResponse) GetMailboxMessage() *MailboxMessage {
 	if x != nil {
-		return x.MailboxMessages
+		return x.MailboxMessage
 	}
 	return nil
 }
@@ -687,7 +687,7 @@ var file_greptime_v1_meta_heartbeat_proto_rawDesc = []byte{
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+	0x65, 0x74, 0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -858,13 +858,13 @@ var file_greptime_v1_meta_heartbeat_proto_depIdxs = []int32{
 	1,  // 3: greptime.v1.meta.HeartbeatRequest.node_stat:type_name -> greptime.v1.meta.NodeStat
 	2,  // 4: greptime.v1.meta.HeartbeatRequest.region_stats:type_name -> greptime.v1.meta.RegionStat
 	3,  // 5: greptime.v1.meta.HeartbeatRequest.replica_stats:type_name -> greptime.v1.meta.ReplicaStat
-	7,  // 6: greptime.v1.meta.HeartbeatRequest.mailbox_messages:type_name -> greptime.v1.meta.MailboxMessage
+	7,  // 6: greptime.v1.meta.HeartbeatRequest.mailbox_message:type_name -> greptime.v1.meta.MailboxMessage
 	8,  // 7: greptime.v1.meta.NodeStat.attrs:type_name -> greptime.v1.meta.NodeStat.AttrsEntry
 	13, // 8: greptime.v1.meta.RegionStat.table_name:type_name -> greptime.v1.meta.TableName
 	9,  // 9: greptime.v1.meta.RegionStat.attrs:type_name -> greptime.v1.meta.RegionStat.AttrsEntry
 	11, // 10: greptime.v1.meta.ReplicaStat.peer:type_name -> greptime.v1.meta.Peer
 	14, // 11: greptime.v1.meta.HeartbeatResponse.header:type_name -> greptime.v1.meta.ResponseHeader
-	7,  // 12: greptime.v1.meta.HeartbeatResponse.mailbox_messages:type_name -> greptime.v1.meta.MailboxMessage
+	7,  // 12: greptime.v1.meta.HeartbeatResponse.mailbox_message:type_name -> greptime.v1.meta.MailboxMessage
 	10, // 13: greptime.v1.meta.AskLeaderRequest.header:type_name -> greptime.v1.meta.RequestHeader
 	14, // 14: greptime.v1.meta.AskLeaderResponse.header:type_name -> greptime.v1.meta.ResponseHeader
 	11, // 15: greptime.v1.meta.AskLeaderResponse.leader:type_name -> greptime.v1.meta.Peer
diff --git a/proto/greptime/v1/meta/heartbeat.proto b/proto/greptime/v1/meta/heartbeat.proto
index c05220b..60e870a 100644
--- a/proto/greptime/v1/meta/heartbeat.proto
+++ b/proto/greptime/v1/meta/heartbeat.proto
@@ -32,7 +32,7 @@ message HeartbeatRequest {
   repeated RegionStat region_stats = 6;
   // Follower nodes and stats, empty on follower nodes
   repeated ReplicaStat replica_stats = 7;
-  repeated MailboxMessage mailbox_messages = 8;
+  MailboxMessage mailbox_message = 8;
 }
 
 message NodeStat {
@@ -81,7 +81,7 @@ message ReplicaStat {
 message HeartbeatResponse {
   ResponseHeader header = 1;
 
-  repeated MailboxMessage mailbox_messages = 2;
+  MailboxMessage mailbox_message = 2;
 }
 
 message AskLeaderRequest {