diff --git a/c++/greptime/v1/meta/heartbeat.pb.cc b/c++/greptime/v1/meta/heartbeat.pb.cc
index 5f4c5e6..683e601 100644
--- a/c++/greptime/v1/meta/heartbeat.pb.cc
+++ b/c++/greptime/v1/meta/heartbeat.pb.cc
@@ -31,6 +31,7 @@ PROTOBUF_CONSTEXPR HeartbeatRequest::HeartbeatRequest(
   , /*decltype(_impl_.report_interval_)*/nullptr
   , /*decltype(_impl_.mailbox_message_)*/nullptr
   , /*decltype(_impl_.info_)*/nullptr
+  , /*decltype(_impl_.flow_stat_)*/nullptr
   , /*decltype(_impl_.duration_since_epoch_)*/uint64_t{0u}
   , /*decltype(_impl_.node_epoch_)*/uint64_t{0u}
   , /*decltype(_impl_._cached_size_)*/{}} {}
@@ -88,6 +89,30 @@ struct RegionStatDefaultTypeInternal {
   };
 };
 PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 RegionStatDefaultTypeInternal _RegionStat_default_instance_;
+PROTOBUF_CONSTEXPR FlowStat_FlowStatSizeEntry_DoNotUse::FlowStat_FlowStatSizeEntry_DoNotUse(
+    ::_pbi::ConstantInitialized) {}
+struct FlowStat_FlowStatSizeEntry_DoNotUseDefaultTypeInternal {
+  PROTOBUF_CONSTEXPR FlowStat_FlowStatSizeEntry_DoNotUseDefaultTypeInternal()
+      : _instance(::_pbi::ConstantInitialized{}) {}
+  ~FlowStat_FlowStatSizeEntry_DoNotUseDefaultTypeInternal() {}
+  union {
+    FlowStat_FlowStatSizeEntry_DoNotUse _instance;
+  };
+};
+PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 FlowStat_FlowStatSizeEntry_DoNotUseDefaultTypeInternal _FlowStat_FlowStatSizeEntry_DoNotUse_default_instance_;
+PROTOBUF_CONSTEXPR FlowStat::FlowStat(
+    ::_pbi::ConstantInitialized): _impl_{
+    /*decltype(_impl_.flow_stat_size_)*/{::_pbi::ConstantInitialized()}
+  , /*decltype(_impl_._cached_size_)*/{}} {}
+struct FlowStatDefaultTypeInternal {
+  PROTOBUF_CONSTEXPR FlowStatDefaultTypeInternal()
+      : _instance(::_pbi::ConstantInitialized{}) {}
+  ~FlowStatDefaultTypeInternal() {}
+  union {
+    FlowStat _instance;
+  };
+};
+PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 FlowStatDefaultTypeInternal _FlowStat_default_instance_;
 PROTOBUF_CONSTEXPR HeartbeatResponse::HeartbeatResponse(
     ::_pbi::ConstantInitialized): _impl_{
     /*decltype(_impl_.header_)*/nullptr
@@ -183,7 +208,7 @@ PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT PROTOBUF_ATTRIBUTE_INIT_PRIORIT
 }  // namespace meta
 }  // namespace v1
 }  // namespace greptime
-static ::_pb::Metadata file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[10];
+static ::_pb::Metadata file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[12];
 static const ::_pb::EnumDescriptor* file_level_enum_descriptors_greptime_2fv1_2fmeta_2fheartbeat_2eproto[1];
 static constexpr ::_pb::ServiceDescriptor const** file_level_service_descriptors_greptime_2fv1_2fmeta_2fheartbeat_2eproto = nullptr;
 
@@ -202,6 +227,7 @@ const uint32_t TableStruct_greptime_2fv1_2fmeta_2fheartbeat_2eproto::offsets[] P
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::HeartbeatRequest, _impl_.duration_since_epoch_),
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::HeartbeatRequest, _impl_.node_epoch_),
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::HeartbeatRequest, _impl_.info_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::HeartbeatRequest, _impl_.flow_stat_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::NodeInfo, _internal_metadata_),
   ~0u,  // no _extensions_
@@ -234,6 +260,23 @@ const uint32_t TableStruct_greptime_2fv1_2fmeta_2fheartbeat_2eproto::offsets[] P
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::RegionStat, _impl_.engine_),
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::RegionStat, _impl_.role_),
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::RegionStat, _impl_.extensions_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse, _has_bits_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  ~0u,  // no _inlined_string_donated_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse, key_),
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse, value_),
+  0,
+  1,
+  ~0u,  // no _has_bits_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::FlowStat, _internal_metadata_),
+  ~0u,  // no _extensions_
+  ~0u,  // no _oneof_case_
+  ~0u,  // no _weak_field_map_
+  ~0u,  // no _inlined_string_donated_
+  PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::FlowStat, _impl_.flow_stat_size_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::greptime::v1::meta::HeartbeatResponse, _internal_metadata_),
   ~0u,  // no _extensions_
@@ -292,15 +335,17 @@ const uint32_t TableStruct_greptime_2fv1_2fmeta_2fheartbeat_2eproto::offsets[] P
 };
 static const ::_pbi::MigrationSchema schemas[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {
   { 0, -1, -1, sizeof(::greptime::v1::meta::HeartbeatRequest)},
-  { 14, -1, -1, sizeof(::greptime::v1::meta::NodeInfo)},
-  { 23, 31, -1, sizeof(::greptime::v1::meta::RegionStat_ExtensionsEntry_DoNotUse)},
-  { 33, -1, -1, sizeof(::greptime::v1::meta::RegionStat)},
-  { 46, -1, -1, sizeof(::greptime::v1::meta::HeartbeatResponse)},
-  { 55, -1, -1, sizeof(::greptime::v1::meta::GrantedRegion)},
-  { 63, -1, -1, sizeof(::greptime::v1::meta::RegionLease)},
-  { 73, -1, -1, sizeof(::greptime::v1::meta::AskLeaderRequest)},
-  { 80, -1, -1, sizeof(::greptime::v1::meta::AskLeaderResponse)},
-  { 88, -1, -1, sizeof(::greptime::v1::meta::MailboxMessage)},
+  { 15, -1, -1, sizeof(::greptime::v1::meta::NodeInfo)},
+  { 24, 32, -1, sizeof(::greptime::v1::meta::RegionStat_ExtensionsEntry_DoNotUse)},
+  { 34, -1, -1, sizeof(::greptime::v1::meta::RegionStat)},
+  { 47, 55, -1, sizeof(::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse)},
+  { 57, -1, -1, sizeof(::greptime::v1::meta::FlowStat)},
+  { 64, -1, -1, sizeof(::greptime::v1::meta::HeartbeatResponse)},
+  { 73, -1, -1, sizeof(::greptime::v1::meta::GrantedRegion)},
+  { 81, -1, -1, sizeof(::greptime::v1::meta::RegionLease)},
+  { 91, -1, -1, sizeof(::greptime::v1::meta::AskLeaderRequest)},
+  { 98, -1, -1, sizeof(::greptime::v1::meta::AskLeaderResponse)},
+  { 106, -1, -1, sizeof(::greptime::v1::meta::MailboxMessage)},
 };
 
 static const ::_pb::Message* const file_default_instances[] = {
@@ -308,6 +353,8 @@ static const ::_pb::Message* const file_default_instances[] = {
   &::greptime::v1::meta::_NodeInfo_default_instance_._instance,
   &::greptime::v1::meta::_RegionStat_ExtensionsEntry_DoNotUse_default_instance_._instance,
   &::greptime::v1::meta::_RegionStat_default_instance_._instance,
+  &::greptime::v1::meta::_FlowStat_FlowStatSizeEntry_DoNotUse_default_instance_._instance,
+  &::greptime::v1::meta::_FlowStat_default_instance_._instance,
   &::greptime::v1::meta::_HeartbeatResponse_default_instance_._instance,
   &::greptime::v1::meta::_GrantedRegion_default_instance_._instance,
   &::greptime::v1::meta::_RegionLease_default_instance_._instance,
@@ -319,7 +366,7 @@ static const ::_pb::Message* const file_default_instances[] = {
 const char descriptor_table_protodef_greptime_2fv1_2fmeta_2fheartbeat_2eproto[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) =
   "\n greptime/v1/meta/heartbeat.proto\022\020grep"
   "time.v1.meta\032\035greptime/v1/meta/common.pr"
-  "oto\"\355\002\n\020HeartbeatRequest\022/\n\006header\030\001 \001(\013"
+  "oto\"\234\003\n\020HeartbeatRequest\022/\n\006header\030\001 \001(\013"
   "2\037.greptime.v1.meta.RequestHeader\022$\n\004pee"
   "r\030\002 \001(\0132\026.greptime.v1.meta.Peer\0227\n\017repor"
   "t_interval\030\003 \001(\0132\036.greptime.v1.meta.Time"
@@ -328,50 +375,55 @@ const char descriptor_table_protodef_greptime_2fv1_2fmeta_2fheartbeat_2eproto[]
   "\005 \001(\0132 .greptime.v1.meta.MailboxMessage\022"
   "\034\n\024duration_since_epoch\030\006 \001(\004\022\022\n\nnode_ep"
   "och\030\007 \001(\004\022(\n\004info\030\010 \001(\0132\032.greptime.v1.me"
-  "ta.NodeInfo\"F\n\010NodeInfo\022\017\n\007version\030\001 \001(\t"
-  "\022\022\n\ngit_commit\030\002 \001(\t\022\025\n\rstart_time_ms\030\003 "
-  "\001(\004\"\207\002\n\nRegionStat\022\021\n\tregion_id\030\001 \001(\004\022\014\n"
-  "\004rcus\030\002 \001(\003\022\014\n\004wcus\030\003 \001(\003\022\031\n\021approximate"
-  "_bytes\030\004 \001(\003\022\016\n\006engine\030\006 \001(\t\022*\n\004role\030\007 \001"
-  "(\0162\034.greptime.v1.meta.RegionRole\022@\n\nexte"
-  "nsions\030c \003(\0132,.greptime.v1.meta.RegionSt"
-  "at.ExtensionsEntry\0321\n\017ExtensionsEntry\022\013\n"
-  "\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\014:\0028\001\"\265\001\n\021Heartb"
-  "eatResponse\0220\n\006header\030\001 \001(\0132 .greptime.v"
-  "1.meta.ResponseHeader\0229\n\017mailbox_message"
-  "\030\002 \001(\0132 .greptime.v1.meta.MailboxMessage"
-  "\0223\n\014region_lease\030\003 \001(\0132\035.greptime.v1.met"
-  "a.RegionLease\"N\n\rGrantedRegion\022\021\n\tregion"
-  "_id\030\001 \001(\004\022*\n\004role\030\002 \001(\0162\034.greptime.v1.me"
-  "ta.RegionRole\"\222\001\n\013RegionLease\0220\n\007regions"
-  "\030\001 \003(\0132\037.greptime.v1.meta.GrantedRegion\022"
-  "\034\n\024duration_since_epoch\030\002 \001(\004\022\025\n\rlease_s"
-  "econds\030\003 \001(\004\022\034\n\024closeable_region_ids\030\004 \003"
-  "(\004\"C\n\020AskLeaderRequest\022/\n\006header\030\001 \001(\0132\037"
-  ".greptime.v1.meta.RequestHeader\"m\n\021AskLe"
-  "aderResponse\0220\n\006header\030\001 \001(\0132 .greptime."
-  "v1.meta.ResponseHeader\022&\n\006leader\030\002 \001(\0132\026"
-  ".greptime.v1.meta.Peer\"|\n\016MailboxMessage"
-  "\022\n\n\002id\030\001 \001(\004\022\017\n\007subject\030\002 \001(\t\022\014\n\004from\030\003 "
-  "\001(\t\022\n\n\002to\030\004 \001(\t\022\030\n\020timestamp_millis\030\005 \001("
-  "\003\022\016\n\004json\030\006 \001(\tH\000B\t\n\007payload*=\n\nRegionRo"
-  "le\022\n\n\006Leader\020\000\022\014\n\010Follower\020\001\022\025\n\021Downgrad"
-  "ingLeader\020\0022\277\001\n\tHeartbeat\022Z\n\tHeartbeat\022\""
-  ".greptime.v1.meta.HeartbeatRequest\032#.gre"
-  "ptime.v1.meta.HeartbeatResponse\"\000(\0010\001\022V\n"
-  "\tAskLeader\022\".greptime.v1.meta.AskLeaderR"
-  "equest\032#.greptime.v1.meta.AskLeaderRespo"
-  "nse\"\000B<Z:github.com/GreptimeTeam/greptim"
-  "e-proto/go/greptime/v1/metab\006proto3"
+  "ta.NodeInfo\022-\n\tflow_stat\030\t \001(\0132\032.greptim"
+  "e.v1.meta.FlowStat\"F\n\010NodeInfo\022\017\n\007versio"
+  "n\030\001 \001(\t\022\022\n\ngit_commit\030\002 \001(\t\022\025\n\rstart_tim"
+  "e_ms\030\003 \001(\004\"\207\002\n\nRegionStat\022\021\n\tregion_id\030\001"
+  " \001(\004\022\014\n\004rcus\030\002 \001(\003\022\014\n\004wcus\030\003 \001(\003\022\031\n\021appr"
+  "oximate_bytes\030\004 \001(\003\022\016\n\006engine\030\006 \001(\t\022*\n\004r"
+  "ole\030\007 \001(\0162\034.greptime.v1.meta.RegionRole\022"
+  "@\n\nextensions\030c \003(\0132,.greptime.v1.meta.R"
+  "egionStat.ExtensionsEntry\0321\n\017ExtensionsE"
+  "ntry\022\013\n\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\014:\0028\001\"\205\001\n"
+  "\010FlowStat\022D\n\016flow_stat_size\030\001 \003(\0132,.grep"
+  "time.v1.meta.FlowStat.FlowStatSizeEntry\032"
+  "3\n\021FlowStatSizeEntry\022\013\n\003key\030\001 \001(\r\022\r\n\005val"
+  "ue\030\002 \001(\004:\0028\001\"\265\001\n\021HeartbeatResponse\0220\n\006he"
+  "ader\030\001 \001(\0132 .greptime.v1.meta.ResponseHe"
+  "ader\0229\n\017mailbox_message\030\002 \001(\0132 .greptime"
+  ".v1.meta.MailboxMessage\0223\n\014region_lease\030"
+  "\003 \001(\0132\035.greptime.v1.meta.RegionLease\"N\n\r"
+  "GrantedRegion\022\021\n\tregion_id\030\001 \001(\004\022*\n\004role"
+  "\030\002 \001(\0162\034.greptime.v1.meta.RegionRole\"\222\001\n"
+  "\013RegionLease\0220\n\007regions\030\001 \003(\0132\037.greptime"
+  ".v1.meta.GrantedRegion\022\034\n\024duration_since"
+  "_epoch\030\002 \001(\004\022\025\n\rlease_seconds\030\003 \001(\004\022\034\n\024c"
+  "loseable_region_ids\030\004 \003(\004\"C\n\020AskLeaderRe"
+  "quest\022/\n\006header\030\001 \001(\0132\037.greptime.v1.meta"
+  ".RequestHeader\"m\n\021AskLeaderResponse\0220\n\006h"
+  "eader\030\001 \001(\0132 .greptime.v1.meta.ResponseH"
+  "eader\022&\n\006leader\030\002 \001(\0132\026.greptime.v1.meta"
+  ".Peer\"|\n\016MailboxMessage\022\n\n\002id\030\001 \001(\004\022\017\n\007s"
+  "ubject\030\002 \001(\t\022\014\n\004from\030\003 \001(\t\022\n\n\002to\030\004 \001(\t\022\030"
+  "\n\020timestamp_millis\030\005 \001(\003\022\016\n\004json\030\006 \001(\tH\000"
+  "B\t\n\007payload*=\n\nRegionRole\022\n\n\006Leader\020\000\022\014\n"
+  "\010Follower\020\001\022\025\n\021DowngradingLeader\020\0022\277\001\n\tH"
+  "eartbeat\022Z\n\tHeartbeat\022\".greptime.v1.meta"
+  ".HeartbeatRequest\032#.greptime.v1.meta.Hea"
+  "rtbeatResponse\"\000(\0010\001\022V\n\tAskLeader\022\".grep"
+  "time.v1.meta.AskLeaderRequest\032#.greptime"
+  ".v1.meta.AskLeaderResponse\"\000B<Z:github.c"
+  "om/GreptimeTeam/greptime-proto/go/grepti"
+  "me/v1/metab\006proto3"
   ;
 static const ::_pbi::DescriptorTable* const descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_deps[1] = {
   &::descriptor_table_greptime_2fv1_2fmeta_2fcommon_2eproto,
 };
 static ::_pbi::once_flag descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once;
 const ::_pbi::DescriptorTable descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto = {
-    false, false, 1835, descriptor_table_protodef_greptime_2fv1_2fmeta_2fheartbeat_2eproto,
+    false, false, 2018, descriptor_table_protodef_greptime_2fv1_2fmeta_2fheartbeat_2eproto,
     "greptime/v1/meta/heartbeat.proto",
-    &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once, descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_deps, 1, 10,
+    &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once, descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_deps, 1, 12,
     schemas, file_default_instances, TableStruct_greptime_2fv1_2fmeta_2fheartbeat_2eproto::offsets,
     file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto, file_level_enum_descriptors_greptime_2fv1_2fmeta_2fheartbeat_2eproto,
     file_level_service_descriptors_greptime_2fv1_2fmeta_2fheartbeat_2eproto,
@@ -410,6 +462,7 @@ class HeartbeatRequest::_Internal {
   static const ::greptime::v1::meta::TimeInterval& report_interval(const HeartbeatRequest* msg);
   static const ::greptime::v1::meta::MailboxMessage& mailbox_message(const HeartbeatRequest* msg);
   static const ::greptime::v1::meta::NodeInfo& info(const HeartbeatRequest* msg);
+  static const ::greptime::v1::meta::FlowStat& flow_stat(const HeartbeatRequest* msg);
 };
 
 const ::greptime::v1::meta::RequestHeader&
@@ -432,6 +485,10 @@ const ::greptime::v1::meta::NodeInfo&
 HeartbeatRequest::_Internal::info(const HeartbeatRequest* msg) {
   return *msg->_impl_.info_;
 }
+const ::greptime::v1::meta::FlowStat&
+HeartbeatRequest::_Internal::flow_stat(const HeartbeatRequest* msg) {
+  return *msg->_impl_.flow_stat_;
+}
 void HeartbeatRequest::clear_header() {
   if (GetArenaForAllocation() == nullptr && _impl_.header_ != nullptr) {
     delete _impl_.header_;
@@ -466,6 +523,7 @@ HeartbeatRequest::HeartbeatRequest(const HeartbeatRequest& from)
     , decltype(_impl_.report_interval_){nullptr}
     , decltype(_impl_.mailbox_message_){nullptr}
     , decltype(_impl_.info_){nullptr}
+    , decltype(_impl_.flow_stat_){nullptr}
     , decltype(_impl_.duration_since_epoch_){}
     , decltype(_impl_.node_epoch_){}
     , /*decltype(_impl_._cached_size_)*/{}};
@@ -486,6 +544,9 @@ HeartbeatRequest::HeartbeatRequest(const HeartbeatRequest& from)
   if (from._internal_has_info()) {
     _this->_impl_.info_ = new ::greptime::v1::meta::NodeInfo(*from._impl_.info_);
   }
+  if (from._internal_has_flow_stat()) {
+    _this->_impl_.flow_stat_ = new ::greptime::v1::meta::FlowStat(*from._impl_.flow_stat_);
+  }
   ::memcpy(&_impl_.duration_since_epoch_, &from._impl_.duration_since_epoch_,
     static_cast<size_t>(reinterpret_cast<char*>(&_impl_.node_epoch_) -
     reinterpret_cast<char*>(&_impl_.duration_since_epoch_)) + sizeof(_impl_.node_epoch_));
@@ -503,6 +564,7 @@ inline void HeartbeatRequest::SharedCtor(
     , decltype(_impl_.report_interval_){nullptr}
     , decltype(_impl_.mailbox_message_){nullptr}
     , decltype(_impl_.info_){nullptr}
+    , decltype(_impl_.flow_stat_){nullptr}
     , decltype(_impl_.duration_since_epoch_){uint64_t{0u}}
     , decltype(_impl_.node_epoch_){uint64_t{0u}}
     , /*decltype(_impl_._cached_size_)*/{}
@@ -526,6 +588,7 @@ inline void HeartbeatRequest::SharedDtor() {
   if (this != internal_default_instance()) delete _impl_.report_interval_;
   if (this != internal_default_instance()) delete _impl_.mailbox_message_;
   if (this != internal_default_instance()) delete _impl_.info_;
+  if (this != internal_default_instance()) delete _impl_.flow_stat_;
 }
 
 void HeartbeatRequest::SetCachedSize(int size) const {
@@ -559,6 +622,10 @@ void HeartbeatRequest::Clear() {
     delete _impl_.info_;
   }
   _impl_.info_ = nullptr;
+  if (GetArenaForAllocation() == nullptr && _impl_.flow_stat_ != nullptr) {
+    delete _impl_.flow_stat_;
+  }
+  _impl_.flow_stat_ = nullptr;
   ::memset(&_impl_.duration_since_epoch_, 0, static_cast<size_t>(
       reinterpret_cast<char*>(&_impl_.node_epoch_) -
       reinterpret_cast<char*>(&_impl_.duration_since_epoch_)) + sizeof(_impl_.node_epoch_));
@@ -640,6 +707,14 @@ const char* HeartbeatRequest::_InternalParse(const char* ptr, ::_pbi::ParseConte
         } else
           goto handle_unusual;
         continue;
+      // .greptime.v1.meta.FlowStat flow_stat = 9;
+      case 9:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 74)) {
+          ptr = ctx->ParseMessage(_internal_mutable_flow_stat(), ptr);
+          CHK_(ptr);
+        } else
+          goto handle_unusual;
+        continue;
       default:
         goto handle_unusual;
     }  // switch
@@ -724,6 +799,13 @@ uint8_t* HeartbeatRequest::_InternalSerialize(
         _Internal::info(this).GetCachedSize(), target, stream);
   }
 
+  // .greptime.v1.meta.FlowStat flow_stat = 9;
+  if (this->_internal_has_flow_stat()) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::
+      InternalWriteMessage(9, _Internal::flow_stat(this),
+        _Internal::flow_stat(this).GetCachedSize(), target, stream);
+  }
+
   if (PROTOBUF_PREDICT_FALSE(_internal_metadata_.have_unknown_fields())) {
     target = ::_pbi::WireFormat::InternalSerializeUnknownFieldsToArray(
         _internal_metadata_.unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(::PROTOBUF_NAMESPACE_ID::UnknownFieldSet::default_instance), target, stream);
@@ -782,6 +864,13 @@ size_t HeartbeatRequest::ByteSizeLong() const {
         *_impl_.info_);
   }
 
+  // .greptime.v1.meta.FlowStat flow_stat = 9;
+  if (this->_internal_has_flow_stat()) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::MessageSize(
+        *_impl_.flow_stat_);
+  }
+
   // uint64 duration_since_epoch = 6;
   if (this->_internal_duration_since_epoch() != 0) {
     total_size += ::_pbi::WireFormatLite::UInt64SizePlusOne(this->_internal_duration_since_epoch());
@@ -831,6 +920,10 @@ void HeartbeatRequest::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const
     _this->_internal_mutable_info()->::greptime::v1::meta::NodeInfo::MergeFrom(
         from._internal_info());
   }
+  if (from._internal_has_flow_stat()) {
+    _this->_internal_mutable_flow_stat()->::greptime::v1::meta::FlowStat::MergeFrom(
+        from._internal_flow_stat());
+  }
   if (from._internal_duration_since_epoch() != 0) {
     _this->_internal_set_duration_since_epoch(from._internal_duration_since_epoch());
   }
@@ -1567,6 +1660,226 @@ void RegionStat::InternalSwap(RegionStat* other) {
 
 // ===================================================================
 
+FlowStat_FlowStatSizeEntry_DoNotUse::FlowStat_FlowStatSizeEntry_DoNotUse() {}
+FlowStat_FlowStatSizeEntry_DoNotUse::FlowStat_FlowStatSizeEntry_DoNotUse(::PROTOBUF_NAMESPACE_ID::Arena* arena)
+    : SuperType(arena) {}
+void FlowStat_FlowStatSizeEntry_DoNotUse::MergeFrom(const FlowStat_FlowStatSizeEntry_DoNotUse& other) {
+  MergeFromInternal(other);
+}
+::PROTOBUF_NAMESPACE_ID::Metadata FlowStat_FlowStatSizeEntry_DoNotUse::GetMetadata() const {
+  return ::_pbi::AssignDescriptors(
+      &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once,
+      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[4]);
+}
+
+// ===================================================================
+
+class FlowStat::_Internal {
+ public:
+};
+
+FlowStat::FlowStat(::PROTOBUF_NAMESPACE_ID::Arena* arena,
+                         bool is_message_owned)
+  : ::PROTOBUF_NAMESPACE_ID::Message(arena, is_message_owned) {
+  SharedCtor(arena, is_message_owned);
+  if (arena != nullptr && !is_message_owned) {
+    arena->OwnCustomDestructor(this, &FlowStat::ArenaDtor);
+  }
+  // @@protoc_insertion_point(arena_constructor:greptime.v1.meta.FlowStat)
+}
+FlowStat::FlowStat(const FlowStat& from)
+  : ::PROTOBUF_NAMESPACE_ID::Message() {
+  FlowStat* const _this = this; (void)_this;
+  new (&_impl_) Impl_{
+      /*decltype(_impl_.flow_stat_size_)*/{}
+    , /*decltype(_impl_._cached_size_)*/{}};
+
+  _internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+  _this->_impl_.flow_stat_size_.MergeFrom(from._impl_.flow_stat_size_);
+  // @@protoc_insertion_point(copy_constructor:greptime.v1.meta.FlowStat)
+}
+
+inline void FlowStat::SharedCtor(
+    ::_pb::Arena* arena, bool is_message_owned) {
+  (void)arena;
+  (void)is_message_owned;
+  new (&_impl_) Impl_{
+      /*decltype(_impl_.flow_stat_size_)*/{::_pbi::ArenaInitialized(), arena}
+    , /*decltype(_impl_._cached_size_)*/{}
+  };
+}
+
+FlowStat::~FlowStat() {
+  // @@protoc_insertion_point(destructor:greptime.v1.meta.FlowStat)
+  if (auto *arena = _internal_metadata_.DeleteReturnArena<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>()) {
+  (void)arena;
+    ArenaDtor(this);
+    return;
+  }
+  SharedDtor();
+}
+
+inline void FlowStat::SharedDtor() {
+  GOOGLE_DCHECK(GetArenaForAllocation() == nullptr);
+  _impl_.flow_stat_size_.Destruct();
+  _impl_.flow_stat_size_.~MapField();
+}
+
+void FlowStat::ArenaDtor(void* object) {
+  FlowStat* _this = reinterpret_cast< FlowStat* >(object);
+  _this->_impl_.flow_stat_size_.Destruct();
+}
+void FlowStat::SetCachedSize(int size) const {
+  _impl_._cached_size_.Set(size);
+}
+
+void FlowStat::Clear() {
+// @@protoc_insertion_point(message_clear_start:greptime.v1.meta.FlowStat)
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  _impl_.flow_stat_size_.Clear();
+  _internal_metadata_.Clear<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>();
+}
+
+const char* FlowStat::_InternalParse(const char* ptr, ::_pbi::ParseContext* ctx) {
+#define CHK_(x) if (PROTOBUF_PREDICT_FALSE(!(x))) goto failure
+  while (!ctx->Done(&ptr)) {
+    uint32_t tag;
+    ptr = ::_pbi::ReadTag(ptr, &tag);
+    switch (tag >> 3) {
+      // map<uint32, uint64> flow_stat_size = 1;
+      case 1:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<uint8_t>(tag) == 10)) {
+          ptr -= 1;
+          do {
+            ptr += 1;
+            ptr = ctx->ParseMessage(&_impl_.flow_stat_size_, ptr);
+            CHK_(ptr);
+            if (!ctx->DataAvailable(ptr)) break;
+          } while (::PROTOBUF_NAMESPACE_ID::internal::ExpectTag<10>(ptr));
+        } else
+          goto handle_unusual;
+        continue;
+      default:
+        goto handle_unusual;
+    }  // switch
+  handle_unusual:
+    if ((tag == 0) || ((tag & 7) == 4)) {
+      CHK_(ptr);
+      ctx->SetLastTag(tag);
+      goto message_done;
+    }
+    ptr = UnknownFieldParse(
+        tag,
+        _internal_metadata_.mutable_unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(),
+        ptr, ctx);
+    CHK_(ptr != nullptr);
+  }  // while
+message_done:
+  return ptr;
+failure:
+  ptr = nullptr;
+  goto message_done;
+#undef CHK_
+}
+
+uint8_t* FlowStat::_InternalSerialize(
+    uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const {
+  // @@protoc_insertion_point(serialize_to_array_start:greptime.v1.meta.FlowStat)
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  // map<uint32, uint64> flow_stat_size = 1;
+  if (!this->_internal_flow_stat_size().empty()) {
+    using MapType = ::_pb::Map<uint32_t, uint64_t>;
+    using WireHelper = FlowStat_FlowStatSizeEntry_DoNotUse::Funcs;
+    const auto& map_field = this->_internal_flow_stat_size();
+
+    if (stream->IsSerializationDeterministic() && map_field.size() > 1) {
+      for (const auto& entry : ::_pbi::MapSorterFlat<MapType>(map_field)) {
+        target = WireHelper::InternalSerialize(1, entry.first, entry.second, target, stream);
+      }
+    } else {
+      for (const auto& entry : map_field) {
+        target = WireHelper::InternalSerialize(1, entry.first, entry.second, target, stream);
+      }
+    }
+  }
+
+  if (PROTOBUF_PREDICT_FALSE(_internal_metadata_.have_unknown_fields())) {
+    target = ::_pbi::WireFormat::InternalSerializeUnknownFieldsToArray(
+        _internal_metadata_.unknown_fields<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(::PROTOBUF_NAMESPACE_ID::UnknownFieldSet::default_instance), target, stream);
+  }
+  // @@protoc_insertion_point(serialize_to_array_end:greptime.v1.meta.FlowStat)
+  return target;
+}
+
+size_t FlowStat::ByteSizeLong() const {
+// @@protoc_insertion_point(message_byte_size_start:greptime.v1.meta.FlowStat)
+  size_t total_size = 0;
+
+  uint32_t cached_has_bits = 0;
+  // Prevent compiler warnings about cached_has_bits being unused
+  (void) cached_has_bits;
+
+  // map<uint32, uint64> flow_stat_size = 1;
+  total_size += 1 *
+      ::PROTOBUF_NAMESPACE_ID::internal::FromIntSize(this->_internal_flow_stat_size_size());
+  for (::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >::const_iterator
+      it = this->_internal_flow_stat_size().begin();
+      it != this->_internal_flow_stat_size().end(); ++it) {
+    total_size += FlowStat_FlowStatSizeEntry_DoNotUse::Funcs::ByteSizeLong(it->first, it->second);
+  }
+
+  return MaybeComputeUnknownFieldsSize(total_size, &_impl_._cached_size_);
+}
+
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData FlowStat::_class_data_ = {
+    ::PROTOBUF_NAMESPACE_ID::Message::CopyWithSourceCheck,
+    FlowStat::MergeImpl
+};
+const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*FlowStat::GetClassData() const { return &_class_data_; }
+
+
+void FlowStat::MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg) {
+  auto* const _this = static_cast<FlowStat*>(&to_msg);
+  auto& from = static_cast<const FlowStat&>(from_msg);
+  // @@protoc_insertion_point(class_specific_merge_from_start:greptime.v1.meta.FlowStat)
+  GOOGLE_DCHECK_NE(&from, _this);
+  uint32_t cached_has_bits = 0;
+  (void) cached_has_bits;
+
+  _this->_impl_.flow_stat_size_.MergeFrom(from._impl_.flow_stat_size_);
+  _this->_internal_metadata_.MergeFrom<::PROTOBUF_NAMESPACE_ID::UnknownFieldSet>(from._internal_metadata_);
+}
+
+void FlowStat::CopyFrom(const FlowStat& from) {
+// @@protoc_insertion_point(class_specific_copy_from_start:greptime.v1.meta.FlowStat)
+  if (&from == this) return;
+  Clear();
+  MergeFrom(from);
+}
+
+bool FlowStat::IsInitialized() const {
+  return true;
+}
+
+void FlowStat::InternalSwap(FlowStat* other) {
+  using std::swap;
+  _internal_metadata_.InternalSwap(&other->_internal_metadata_);
+  _impl_.flow_stat_size_.InternalSwap(&other->_impl_.flow_stat_size_);
+}
+
+::PROTOBUF_NAMESPACE_ID::Metadata FlowStat::GetMetadata() const {
+  return ::_pbi::AssignDescriptors(
+      &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once,
+      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[5]);
+}
+
+// ===================================================================
+
 class HeartbeatResponse::_Internal {
  public:
   static const ::greptime::v1::meta::ResponseHeader& header(const HeartbeatResponse* msg);
@@ -1848,7 +2161,7 @@ void HeartbeatResponse::InternalSwap(HeartbeatResponse* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata HeartbeatResponse::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[4]);
+      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[6]);
 }
 
 // ===================================================================
@@ -2062,7 +2375,7 @@ void GrantedRegion::InternalSwap(GrantedRegion* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata GrantedRegion::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[5]);
+      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[7]);
 }
 
 // ===================================================================
@@ -2349,7 +2662,7 @@ void RegionLease::InternalSwap(RegionLease* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata RegionLease::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[6]);
+      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[8]);
 }
 
 // ===================================================================
@@ -2548,7 +2861,7 @@ void AskLeaderRequest::InternalSwap(AskLeaderRequest* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata AskLeaderRequest::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[7]);
+      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[9]);
 }
 
 // ===================================================================
@@ -2799,7 +3112,7 @@ void AskLeaderResponse::InternalSwap(AskLeaderResponse* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata AskLeaderResponse::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[8]);
+      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[10]);
 }
 
 // ===================================================================
@@ -3239,7 +3552,7 @@ void MailboxMessage::InternalSwap(MailboxMessage* other) {
 ::PROTOBUF_NAMESPACE_ID::Metadata MailboxMessage::GetMetadata() const {
   return ::_pbi::AssignDescriptors(
       &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_getter, &descriptor_table_greptime_2fv1_2fmeta_2fheartbeat_2eproto_once,
-      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[9]);
+      file_level_metadata_greptime_2fv1_2fmeta_2fheartbeat_2eproto[11]);
 }
 
 // @@protoc_insertion_point(namespace_scope)
@@ -3263,6 +3576,14 @@ template<> PROTOBUF_NOINLINE ::greptime::v1::meta::RegionStat*
 Arena::CreateMaybeMessage< ::greptime::v1::meta::RegionStat >(Arena* arena) {
   return Arena::CreateMessageInternal< ::greptime::v1::meta::RegionStat >(arena);
 }
+template<> PROTOBUF_NOINLINE ::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse*
+Arena::CreateMaybeMessage< ::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse >(arena);
+}
+template<> PROTOBUF_NOINLINE ::greptime::v1::meta::FlowStat*
+Arena::CreateMaybeMessage< ::greptime::v1::meta::FlowStat >(Arena* arena) {
+  return Arena::CreateMessageInternal< ::greptime::v1::meta::FlowStat >(arena);
+}
 template<> PROTOBUF_NOINLINE ::greptime::v1::meta::HeartbeatResponse*
 Arena::CreateMaybeMessage< ::greptime::v1::meta::HeartbeatResponse >(Arena* arena) {
   return Arena::CreateMessageInternal< ::greptime::v1::meta::HeartbeatResponse >(arena);
diff --git a/c++/greptime/v1/meta/heartbeat.pb.h b/c++/greptime/v1/meta/heartbeat.pb.h
index 7fe3f8b..7ed2ee4 100644
--- a/c++/greptime/v1/meta/heartbeat.pb.h
+++ b/c++/greptime/v1/meta/heartbeat.pb.h
@@ -58,6 +58,12 @@ extern AskLeaderRequestDefaultTypeInternal _AskLeaderRequest_default_instance_;
 class AskLeaderResponse;
 struct AskLeaderResponseDefaultTypeInternal;
 extern AskLeaderResponseDefaultTypeInternal _AskLeaderResponse_default_instance_;
+class FlowStat;
+struct FlowStatDefaultTypeInternal;
+extern FlowStatDefaultTypeInternal _FlowStat_default_instance_;
+class FlowStat_FlowStatSizeEntry_DoNotUse;
+struct FlowStat_FlowStatSizeEntry_DoNotUseDefaultTypeInternal;
+extern FlowStat_FlowStatSizeEntry_DoNotUseDefaultTypeInternal _FlowStat_FlowStatSizeEntry_DoNotUse_default_instance_;
 class GrantedRegion;
 struct GrantedRegionDefaultTypeInternal;
 extern GrantedRegionDefaultTypeInternal _GrantedRegion_default_instance_;
@@ -88,6 +94,8 @@ extern RegionStat_ExtensionsEntry_DoNotUseDefaultTypeInternal _RegionStat_Extens
 PROTOBUF_NAMESPACE_OPEN
 template<> ::greptime::v1::meta::AskLeaderRequest* Arena::CreateMaybeMessage<::greptime::v1::meta::AskLeaderRequest>(Arena*);
 template<> ::greptime::v1::meta::AskLeaderResponse* Arena::CreateMaybeMessage<::greptime::v1::meta::AskLeaderResponse>(Arena*);
+template<> ::greptime::v1::meta::FlowStat* Arena::CreateMaybeMessage<::greptime::v1::meta::FlowStat>(Arena*);
+template<> ::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse* Arena::CreateMaybeMessage<::greptime::v1::meta::FlowStat_FlowStatSizeEntry_DoNotUse>(Arena*);
 template<> ::greptime::v1::meta::GrantedRegion* Arena::CreateMaybeMessage<::greptime::v1::meta::GrantedRegion>(Arena*);
 template<> ::greptime::v1::meta::HeartbeatRequest* Arena::CreateMaybeMessage<::greptime::v1::meta::HeartbeatRequest>(Arena*);
 template<> ::greptime::v1::meta::HeartbeatResponse* Arena::CreateMaybeMessage<::greptime::v1::meta::HeartbeatResponse>(Arena*);
@@ -256,6 +264,7 @@ class HeartbeatRequest final :
     kReportIntervalFieldNumber = 3,
     kMailboxMessageFieldNumber = 5,
     kInfoFieldNumber = 8,
+    kFlowStatFieldNumber = 9,
     kDurationSinceEpochFieldNumber = 6,
     kNodeEpochFieldNumber = 7,
   };
@@ -367,6 +376,24 @@ class HeartbeatRequest final :
       ::greptime::v1::meta::NodeInfo* info);
   ::greptime::v1::meta::NodeInfo* unsafe_arena_release_info();
 
+  // .greptime.v1.meta.FlowStat flow_stat = 9;
+  bool has_flow_stat() const;
+  private:
+  bool _internal_has_flow_stat() const;
+  public:
+  void clear_flow_stat();
+  const ::greptime::v1::meta::FlowStat& flow_stat() const;
+  PROTOBUF_NODISCARD ::greptime::v1::meta::FlowStat* release_flow_stat();
+  ::greptime::v1::meta::FlowStat* mutable_flow_stat();
+  void set_allocated_flow_stat(::greptime::v1::meta::FlowStat* flow_stat);
+  private:
+  const ::greptime::v1::meta::FlowStat& _internal_flow_stat() const;
+  ::greptime::v1::meta::FlowStat* _internal_mutable_flow_stat();
+  public:
+  void unsafe_arena_set_allocated_flow_stat(
+      ::greptime::v1::meta::FlowStat* flow_stat);
+  ::greptime::v1::meta::FlowStat* unsafe_arena_release_flow_stat();
+
   // uint64 duration_since_epoch = 6;
   void clear_duration_since_epoch();
   uint64_t duration_since_epoch() const;
@@ -399,6 +426,7 @@ class HeartbeatRequest final :
     ::greptime::v1::meta::TimeInterval* report_interval_;
     ::greptime::v1::meta::MailboxMessage* mailbox_message_;
     ::greptime::v1::meta::NodeInfo* info_;
+    ::greptime::v1::meta::FlowStat* flow_stat_;
     uint64_t duration_since_epoch_;
     uint64_t node_epoch_;
     mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
@@ -848,6 +876,193 @@ class RegionStat final :
 };
 // -------------------------------------------------------------------
 
+class FlowStat_FlowStatSizeEntry_DoNotUse : public ::PROTOBUF_NAMESPACE_ID::internal::MapEntry<FlowStat_FlowStatSizeEntry_DoNotUse, 
+    uint32_t, uint64_t,
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_UINT32,
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_UINT64> {
+public:
+  typedef ::PROTOBUF_NAMESPACE_ID::internal::MapEntry<FlowStat_FlowStatSizeEntry_DoNotUse, 
+    uint32_t, uint64_t,
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_UINT32,
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_UINT64> SuperType;
+  FlowStat_FlowStatSizeEntry_DoNotUse();
+  explicit PROTOBUF_CONSTEXPR FlowStat_FlowStatSizeEntry_DoNotUse(
+      ::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+  explicit FlowStat_FlowStatSizeEntry_DoNotUse(::PROTOBUF_NAMESPACE_ID::Arena* arena);
+  void MergeFrom(const FlowStat_FlowStatSizeEntry_DoNotUse& other);
+  static const FlowStat_FlowStatSizeEntry_DoNotUse* internal_default_instance() { return reinterpret_cast<const FlowStat_FlowStatSizeEntry_DoNotUse*>(&_FlowStat_FlowStatSizeEntry_DoNotUse_default_instance_); }
+  static bool ValidateKey(void*) { return true; }
+  static bool ValidateValue(void*) { return true; }
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  ::PROTOBUF_NAMESPACE_ID::Metadata GetMetadata() const final;
+  friend struct ::TableStruct_greptime_2fv1_2fmeta_2fheartbeat_2eproto;
+};
+
+// -------------------------------------------------------------------
+
+class FlowStat final :
+    public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.meta.FlowStat) */ {
+ public:
+  inline FlowStat() : FlowStat(nullptr) {}
+  ~FlowStat() override;
+  explicit PROTOBUF_CONSTEXPR FlowStat(::PROTOBUF_NAMESPACE_ID::internal::ConstantInitialized);
+
+  FlowStat(const FlowStat& from);
+  FlowStat(FlowStat&& from) noexcept
+    : FlowStat() {
+    *this = ::std::move(from);
+  }
+
+  inline FlowStat& operator=(const FlowStat& from) {
+    CopyFrom(from);
+    return *this;
+  }
+  inline FlowStat& operator=(FlowStat&& from) noexcept {
+    if (this == &from) return *this;
+    if (GetOwningArena() == from.GetOwningArena()
+  #ifdef PROTOBUF_FORCE_COPY_IN_MOVE
+        && GetOwningArena() != nullptr
+  #endif  // !PROTOBUF_FORCE_COPY_IN_MOVE
+    ) {
+      InternalSwap(&from);
+    } else {
+      CopyFrom(from);
+    }
+    return *this;
+  }
+
+  static const ::PROTOBUF_NAMESPACE_ID::Descriptor* descriptor() {
+    return GetDescriptor();
+  }
+  static const ::PROTOBUF_NAMESPACE_ID::Descriptor* GetDescriptor() {
+    return default_instance().GetMetadata().descriptor;
+  }
+  static const ::PROTOBUF_NAMESPACE_ID::Reflection* GetReflection() {
+    return default_instance().GetMetadata().reflection;
+  }
+  static const FlowStat& default_instance() {
+    return *internal_default_instance();
+  }
+  static inline const FlowStat* internal_default_instance() {
+    return reinterpret_cast<const FlowStat*>(
+               &_FlowStat_default_instance_);
+  }
+  static constexpr int kIndexInFileMessages =
+    5;
+
+  friend void swap(FlowStat& a, FlowStat& b) {
+    a.Swap(&b);
+  }
+  inline void Swap(FlowStat* other) {
+    if (other == this) return;
+  #ifdef PROTOBUF_FORCE_COPY_IN_SWAP
+    if (GetOwningArena() != nullptr &&
+        GetOwningArena() == other->GetOwningArena()) {
+   #else  // PROTOBUF_FORCE_COPY_IN_SWAP
+    if (GetOwningArena() == other->GetOwningArena()) {
+  #endif  // !PROTOBUF_FORCE_COPY_IN_SWAP
+      InternalSwap(other);
+    } else {
+      ::PROTOBUF_NAMESPACE_ID::internal::GenericSwap(this, other);
+    }
+  }
+  void UnsafeArenaSwap(FlowStat* other) {
+    if (other == this) return;
+    GOOGLE_DCHECK(GetOwningArena() == other->GetOwningArena());
+    InternalSwap(other);
+  }
+
+  // implements Message ----------------------------------------------
+
+  FlowStat* New(::PROTOBUF_NAMESPACE_ID::Arena* arena = nullptr) const final {
+    return CreateMaybeMessage<FlowStat>(arena);
+  }
+  using ::PROTOBUF_NAMESPACE_ID::Message::CopyFrom;
+  void CopyFrom(const FlowStat& from);
+  using ::PROTOBUF_NAMESPACE_ID::Message::MergeFrom;
+  void MergeFrom( const FlowStat& from) {
+    FlowStat::MergeImpl(*this, from);
+  }
+  private:
+  static void MergeImpl(::PROTOBUF_NAMESPACE_ID::Message& to_msg, const ::PROTOBUF_NAMESPACE_ID::Message& from_msg);
+  public:
+  PROTOBUF_ATTRIBUTE_REINITIALIZES void Clear() final;
+  bool IsInitialized() const final;
+
+  size_t ByteSizeLong() const final;
+  const char* _InternalParse(const char* ptr, ::PROTOBUF_NAMESPACE_ID::internal::ParseContext* ctx) final;
+  uint8_t* _InternalSerialize(
+      uint8_t* target, ::PROTOBUF_NAMESPACE_ID::io::EpsCopyOutputStream* stream) const final;
+  int GetCachedSize() const final { return _impl_._cached_size_.Get(); }
+
+  private:
+  void SharedCtor(::PROTOBUF_NAMESPACE_ID::Arena* arena, bool is_message_owned);
+  void SharedDtor();
+  void SetCachedSize(int size) const final;
+  void InternalSwap(FlowStat* other);
+
+  private:
+  friend class ::PROTOBUF_NAMESPACE_ID::internal::AnyMetadata;
+  static ::PROTOBUF_NAMESPACE_ID::StringPiece FullMessageName() {
+    return "greptime.v1.meta.FlowStat";
+  }
+  protected:
+  explicit FlowStat(::PROTOBUF_NAMESPACE_ID::Arena* arena,
+                       bool is_message_owned = false);
+  private:
+  static void ArenaDtor(void* object);
+  public:
+
+  static const ClassData _class_data_;
+  const ::PROTOBUF_NAMESPACE_ID::Message::ClassData*GetClassData() const final;
+
+  ::PROTOBUF_NAMESPACE_ID::Metadata GetMetadata() const final;
+
+  // nested types ----------------------------------------------------
+
+
+  // accessors -------------------------------------------------------
+
+  enum : int {
+    kFlowStatSizeFieldNumber = 1,
+  };
+  // map<uint32, uint64> flow_stat_size = 1;
+  int flow_stat_size_size() const;
+  private:
+  int _internal_flow_stat_size_size() const;
+  public:
+  void clear_flow_stat_size();
+  private:
+  const ::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >&
+      _internal_flow_stat_size() const;
+  ::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >*
+      _internal_mutable_flow_stat_size();
+  public:
+  const ::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >&
+      flow_stat_size() const;
+  ::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >*
+      mutable_flow_stat_size();
+
+  // @@protoc_insertion_point(class_scope:greptime.v1.meta.FlowStat)
+ private:
+  class _Internal;
+
+  template <typename T> friend class ::PROTOBUF_NAMESPACE_ID::Arena::InternalHelper;
+  typedef void InternalArenaConstructable_;
+  typedef void DestructorSkippable_;
+  struct Impl_ {
+    ::PROTOBUF_NAMESPACE_ID::internal::MapField<
+        FlowStat_FlowStatSizeEntry_DoNotUse,
+        uint32_t, uint64_t,
+        ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_UINT32,
+        ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_UINT64> flow_stat_size_;
+    mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
+  };
+  union { Impl_ _impl_; };
+  friend struct ::TableStruct_greptime_2fv1_2fmeta_2fheartbeat_2eproto;
+};
+// -------------------------------------------------------------------
+
 class HeartbeatResponse final :
     public ::PROTOBUF_NAMESPACE_ID::Message /* @@protoc_insertion_point(class_definition:greptime.v1.meta.HeartbeatResponse) */ {
  public:
@@ -896,7 +1111,7 @@ class HeartbeatResponse final :
                &_HeartbeatResponse_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    4;
+    6;
 
   friend void swap(HeartbeatResponse& a, HeartbeatResponse& b) {
     a.Swap(&b);
@@ -1093,7 +1308,7 @@ class GrantedRegion final :
                &_GrantedRegion_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    5;
+    7;
 
   friend void swap(GrantedRegion& a, GrantedRegion& b) {
     a.Swap(&b);
@@ -1252,7 +1467,7 @@ class RegionLease final :
                &_RegionLease_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    6;
+    8;
 
   friend void swap(RegionLease& a, RegionLease& b) {
     a.Swap(&b);
@@ -1456,7 +1671,7 @@ class AskLeaderRequest final :
                &_AskLeaderRequest_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    7;
+    9;
 
   friend void swap(AskLeaderRequest& a, AskLeaderRequest& b) {
     a.Swap(&b);
@@ -1613,7 +1828,7 @@ class AskLeaderResponse final :
                &_AskLeaderResponse_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    8;
+    10;
 
   friend void swap(AskLeaderResponse& a, AskLeaderResponse& b) {
     a.Swap(&b);
@@ -1795,7 +2010,7 @@ class MailboxMessage final :
                &_MailboxMessage_default_instance_);
   }
   static constexpr int kIndexInFileMessages =
-    9;
+    11;
 
   friend void swap(MailboxMessage& a, MailboxMessage& b) {
     a.Swap(&b);
@@ -2510,6 +2725,96 @@ inline void HeartbeatRequest::set_allocated_info(::greptime::v1::meta::NodeInfo*
   // @@protoc_insertion_point(field_set_allocated:greptime.v1.meta.HeartbeatRequest.info)
 }
 
+// .greptime.v1.meta.FlowStat flow_stat = 9;
+inline bool HeartbeatRequest::_internal_has_flow_stat() const {
+  return this != internal_default_instance() && _impl_.flow_stat_ != nullptr;
+}
+inline bool HeartbeatRequest::has_flow_stat() const {
+  return _internal_has_flow_stat();
+}
+inline void HeartbeatRequest::clear_flow_stat() {
+  if (GetArenaForAllocation() == nullptr && _impl_.flow_stat_ != nullptr) {
+    delete _impl_.flow_stat_;
+  }
+  _impl_.flow_stat_ = nullptr;
+}
+inline const ::greptime::v1::meta::FlowStat& HeartbeatRequest::_internal_flow_stat() const {
+  const ::greptime::v1::meta::FlowStat* p = _impl_.flow_stat_;
+  return p != nullptr ? *p : reinterpret_cast<const ::greptime::v1::meta::FlowStat&>(
+      ::greptime::v1::meta::_FlowStat_default_instance_);
+}
+inline const ::greptime::v1::meta::FlowStat& HeartbeatRequest::flow_stat() const {
+  // @@protoc_insertion_point(field_get:greptime.v1.meta.HeartbeatRequest.flow_stat)
+  return _internal_flow_stat();
+}
+inline void HeartbeatRequest::unsafe_arena_set_allocated_flow_stat(
+    ::greptime::v1::meta::FlowStat* flow_stat) {
+  if (GetArenaForAllocation() == nullptr) {
+    delete reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(_impl_.flow_stat_);
+  }
+  _impl_.flow_stat_ = flow_stat;
+  if (flow_stat) {
+    
+  } else {
+    
+  }
+  // @@protoc_insertion_point(field_unsafe_arena_set_allocated:greptime.v1.meta.HeartbeatRequest.flow_stat)
+}
+inline ::greptime::v1::meta::FlowStat* HeartbeatRequest::release_flow_stat() {
+  
+  ::greptime::v1::meta::FlowStat* temp = _impl_.flow_stat_;
+  _impl_.flow_stat_ = nullptr;
+#ifdef PROTOBUF_FORCE_COPY_IN_RELEASE
+  auto* old =  reinterpret_cast<::PROTOBUF_NAMESPACE_ID::MessageLite*>(temp);
+  temp = ::PROTOBUF_NAMESPACE_ID::internal::DuplicateIfNonNull(temp);
+  if (GetArenaForAllocation() == nullptr) { delete old; }
+#else  // PROTOBUF_FORCE_COPY_IN_RELEASE
+  if (GetArenaForAllocation() != nullptr) {
+    temp = ::PROTOBUF_NAMESPACE_ID::internal::DuplicateIfNonNull(temp);
+  }
+#endif  // !PROTOBUF_FORCE_COPY_IN_RELEASE
+  return temp;
+}
+inline ::greptime::v1::meta::FlowStat* HeartbeatRequest::unsafe_arena_release_flow_stat() {
+  // @@protoc_insertion_point(field_release:greptime.v1.meta.HeartbeatRequest.flow_stat)
+  
+  ::greptime::v1::meta::FlowStat* temp = _impl_.flow_stat_;
+  _impl_.flow_stat_ = nullptr;
+  return temp;
+}
+inline ::greptime::v1::meta::FlowStat* HeartbeatRequest::_internal_mutable_flow_stat() {
+  
+  if (_impl_.flow_stat_ == nullptr) {
+    auto* p = CreateMaybeMessage<::greptime::v1::meta::FlowStat>(GetArenaForAllocation());
+    _impl_.flow_stat_ = p;
+  }
+  return _impl_.flow_stat_;
+}
+inline ::greptime::v1::meta::FlowStat* HeartbeatRequest::mutable_flow_stat() {
+  ::greptime::v1::meta::FlowStat* _msg = _internal_mutable_flow_stat();
+  // @@protoc_insertion_point(field_mutable:greptime.v1.meta.HeartbeatRequest.flow_stat)
+  return _msg;
+}
+inline void HeartbeatRequest::set_allocated_flow_stat(::greptime::v1::meta::FlowStat* flow_stat) {
+  ::PROTOBUF_NAMESPACE_ID::Arena* message_arena = GetArenaForAllocation();
+  if (message_arena == nullptr) {
+    delete _impl_.flow_stat_;
+  }
+  if (flow_stat) {
+    ::PROTOBUF_NAMESPACE_ID::Arena* submessage_arena =
+        ::PROTOBUF_NAMESPACE_ID::Arena::InternalGetOwningArena(flow_stat);
+    if (message_arena != submessage_arena) {
+      flow_stat = ::PROTOBUF_NAMESPACE_ID::internal::GetOwnedMessage(
+          message_arena, flow_stat, submessage_arena);
+    }
+    
+  } else {
+    
+  }
+  _impl_.flow_stat_ = flow_stat;
+  // @@protoc_insertion_point(field_set_allocated:greptime.v1.meta.HeartbeatRequest.flow_stat)
+}
+
 // -------------------------------------------------------------------
 
 // NodeInfo
@@ -2821,6 +3126,41 @@ RegionStat::mutable_extensions() {
 
 // -------------------------------------------------------------------
 
+// -------------------------------------------------------------------
+
+// FlowStat
+
+// map<uint32, uint64> flow_stat_size = 1;
+inline int FlowStat::_internal_flow_stat_size_size() const {
+  return _impl_.flow_stat_size_.size();
+}
+inline int FlowStat::flow_stat_size_size() const {
+  return _internal_flow_stat_size_size();
+}
+inline void FlowStat::clear_flow_stat_size() {
+  _impl_.flow_stat_size_.Clear();
+}
+inline const ::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >&
+FlowStat::_internal_flow_stat_size() const {
+  return _impl_.flow_stat_size_.GetMap();
+}
+inline const ::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >&
+FlowStat::flow_stat_size() const {
+  // @@protoc_insertion_point(field_map:greptime.v1.meta.FlowStat.flow_stat_size)
+  return _internal_flow_stat_size();
+}
+inline ::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >*
+FlowStat::_internal_mutable_flow_stat_size() {
+  return _impl_.flow_stat_size_.MutableMap();
+}
+inline ::PROTOBUF_NAMESPACE_ID::Map< uint32_t, uint64_t >*
+FlowStat::mutable_flow_stat_size() {
+  // @@protoc_insertion_point(field_mutable_map:greptime.v1.meta.FlowStat.flow_stat_size)
+  return _internal_mutable_flow_stat_size();
+}
+
+// -------------------------------------------------------------------
+
 // HeartbeatResponse
 
 // .greptime.v1.meta.ResponseHeader header = 1;
@@ -3827,6 +4167,10 @@ inline MailboxMessage::PayloadCase MailboxMessage::payload_case() const {
 
 // -------------------------------------------------------------------
 
+// -------------------------------------------------------------------
+
+// -------------------------------------------------------------------
+
 
 // @@protoc_insertion_point(namespace_scope)
 
diff --git a/go/greptime/v1/meta/heartbeat.pb.go b/go/greptime/v1/meta/heartbeat.pb.go
index 90f5350..c8e346e 100644
--- a/go/greptime/v1/meta/heartbeat.pb.go
+++ b/go/greptime/v1/meta/heartbeat.pb.go
@@ -41,9 +41,11 @@ const (
 	RegionRole_Leader RegionRole = 0
 	// Readonly region.
 	RegionRole_Follower RegionRole = 1
-	// A downgrading region, which is in the process of downgrading from Leader to Follower.
+	// A downgrading region, which is in the process of downgrading from Leader to
+	// Follower.
 	//
-	// This role is used to prevent the region from being written during the downgrade process.
+	// This role is used to prevent the region from being written during the
+	// downgrade process.
 	RegionRole_DowngradingLeader RegionRole = 2
 )
 
@@ -107,6 +109,7 @@ type HeartbeatRequest struct {
 	// The node's epoch
 	NodeEpoch uint64    `protobuf:"varint,7,opt,name=node_epoch,json=nodeEpoch,proto3" json:"node_epoch,omitempty"`
 	Info      *NodeInfo `protobuf:"bytes,8,opt,name=info,proto3" json:"info,omitempty"`
+	FlowStat  *FlowStat `protobuf:"bytes,9,opt,name=flow_stat,json=flowStat,proto3" json:"flow_stat,omitempty"`
 }
 
 func (x *HeartbeatRequest) Reset() {
@@ -197,6 +200,13 @@ func (x *HeartbeatRequest) GetInfo() *NodeInfo {
 	return nil
 }
 
+func (x *HeartbeatRequest) GetFlowStat() *FlowStat {
+	if x != nil {
+		return x.FlowStat
+	}
+	return nil
+}
+
 type NodeInfo struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -363,6 +373,56 @@ func (x *RegionStat) GetExtensions() map[string][]byte {
 	return nil
 }
 
+type FlowStat struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Each flow's in mem state's size in bytes
+	// due to protobuf's key can't be a message, so we use uint32 as the key which
+	// is [`FlowId`]'s inner field `id`
+	FlowStatSize map[uint32]uint64 `protobuf:"bytes,1,rep,name=flow_stat_size,json=flowStatSize,proto3" json:"flow_stat_size,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
+}
+
+func (x *FlowStat) Reset() {
+	*x = FlowStat{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FlowStat) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FlowStat) ProtoMessage() {}
+
+func (x *FlowStat) ProtoReflect() protoreflect.Message {
+	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FlowStat.ProtoReflect.Descriptor instead.
+func (*FlowStat) Descriptor() ([]byte, []int) {
+	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *FlowStat) GetFlowStatSize() map[uint32]uint64 {
+	if x != nil {
+		return x.FlowStatSize
+	}
+	return nil
+}
+
 type HeartbeatResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -376,7 +436,7 @@ type HeartbeatResponse struct {
 func (x *HeartbeatResponse) Reset() {
 	*x = HeartbeatResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[3]
+		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -389,7 +449,7 @@ func (x *HeartbeatResponse) String() string {
 func (*HeartbeatResponse) ProtoMessage() {}
 
 func (x *HeartbeatResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[3]
+	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -402,7 +462,7 @@ func (x *HeartbeatResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use HeartbeatResponse.ProtoReflect.Descriptor instead.
 func (*HeartbeatResponse) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{3}
+	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{4}
 }
 
 func (x *HeartbeatResponse) GetHeader() *ResponseHeader {
@@ -438,7 +498,7 @@ type GrantedRegion struct {
 func (x *GrantedRegion) Reset() {
 	*x = GrantedRegion{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[4]
+		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -451,7 +511,7 @@ func (x *GrantedRegion) String() string {
 func (*GrantedRegion) ProtoMessage() {}
 
 func (x *GrantedRegion) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[4]
+	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -464,7 +524,7 @@ func (x *GrantedRegion) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GrantedRegion.ProtoReflect.Descriptor instead.
 func (*GrantedRegion) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{4}
+	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{5}
 }
 
 func (x *GrantedRegion) GetRegionId() uint64 {
@@ -495,7 +555,7 @@ type RegionLease struct {
 func (x *RegionLease) Reset() {
 	*x = RegionLease{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[5]
+		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -508,7 +568,7 @@ func (x *RegionLease) String() string {
 func (*RegionLease) ProtoMessage() {}
 
 func (x *RegionLease) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[5]
+	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -521,7 +581,7 @@ func (x *RegionLease) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use RegionLease.ProtoReflect.Descriptor instead.
 func (*RegionLease) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{5}
+	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *RegionLease) GetRegions() []*GrantedRegion {
@@ -563,7 +623,7 @@ type AskLeaderRequest struct {
 func (x *AskLeaderRequest) Reset() {
 	*x = AskLeaderRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[6]
+		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -576,7 +636,7 @@ func (x *AskLeaderRequest) String() string {
 func (*AskLeaderRequest) ProtoMessage() {}
 
 func (x *AskLeaderRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[6]
+	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -589,7 +649,7 @@ func (x *AskLeaderRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use AskLeaderRequest.ProtoReflect.Descriptor instead.
 func (*AskLeaderRequest) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{6}
+	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *AskLeaderRequest) GetHeader() *RequestHeader {
@@ -611,7 +671,7 @@ type AskLeaderResponse struct {
 func (x *AskLeaderResponse) Reset() {
 	*x = AskLeaderResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[7]
+		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -624,7 +684,7 @@ func (x *AskLeaderResponse) String() string {
 func (*AskLeaderResponse) ProtoMessage() {}
 
 func (x *AskLeaderResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[7]
+	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -637,7 +697,7 @@ func (x *AskLeaderResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use AskLeaderResponse.ProtoReflect.Descriptor instead.
 func (*AskLeaderResponse) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{7}
+	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *AskLeaderResponse) GetHeader() *ResponseHeader {
@@ -679,7 +739,7 @@ type MailboxMessage struct {
 func (x *MailboxMessage) Reset() {
 	*x = MailboxMessage{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[8]
+		mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -692,7 +752,7 @@ func (x *MailboxMessage) String() string {
 func (*MailboxMessage) ProtoMessage() {}
 
 func (x *MailboxMessage) ProtoReflect() protoreflect.Message {
-	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[8]
+	mi := &file_greptime_v1_meta_heartbeat_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -705,7 +765,7 @@ func (x *MailboxMessage) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use MailboxMessage.ProtoReflect.Descriptor instead.
 func (*MailboxMessage) Descriptor() ([]byte, []int) {
-	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{8}
+	return file_greptime_v1_meta_heartbeat_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *MailboxMessage) GetId() uint64 {
@@ -775,7 +835,7 @@ var file_greptime_v1_meta_heartbeat_proto_rawDesc = []byte{
 	0x74, 0x6f, 0x12, 0x10, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2e, 0x76, 0x31, 0x2e,
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+	0x62, 0x65, 0x61, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x28, 0x01,
+	0x30, 0x01, 0x12, 0x56, 0x0a, 0x09, 0x41, 0x73, 0x6b, 0x4c, 0x65, 0x61, 0x64, 0x65, 0x72, 0x12,
+	0x22, 0x2e, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x6d, 0x65,
+	0x74, 0x61, 0x2e, 0x41, 0x73, 0x6b, 0x4c, 0x65, 0x61, 0x64, 0x65, 0x72, 0x52, 0x65, 0x71, 0x75,
+	0x65, 0x73, 0x74, 0x1a, 0x23, 0x2e, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2e, 0x76,
+	0x31, 0x2e, 0x6d, 0x65, 0x74, 0x61, 0x2e, 0x41, 0x73, 0x6b, 0x4c, 0x65, 0x61, 0x64, 0x65, 0x72,
+	0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x3c, 0x5a, 0x3a, 0x67, 0x69,
+	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x47, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d,
+	0x65, 0x54, 0x65, 0x61, 0x6d, 0x2f, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65, 0x2d, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x67, 0x6f, 0x2f, 0x67, 0x72, 0x65, 0x70, 0x74, 0x69, 0x6d, 0x65,
+	0x2f, 0x76, 0x31, 0x2f, 0x6d, 0x65, 0x74, 0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -925,50 +998,54 @@ func file_greptime_v1_meta_heartbeat_proto_rawDescGZIP() []byte {
 }
 
 var file_greptime_v1_meta_heartbeat_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_greptime_v1_meta_heartbeat_proto_msgTypes = make([]protoimpl.MessageInfo, 10)
+var file_greptime_v1_meta_heartbeat_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
 var file_greptime_v1_meta_heartbeat_proto_goTypes = []interface{}{
 	(RegionRole)(0),           // 0: greptime.v1.meta.RegionRole
 	(*HeartbeatRequest)(nil),  // 1: greptime.v1.meta.HeartbeatRequest
 	(*NodeInfo)(nil),          // 2: greptime.v1.meta.NodeInfo
 	(*RegionStat)(nil),        // 3: greptime.v1.meta.RegionStat
-	(*HeartbeatResponse)(nil), // 4: greptime.v1.meta.HeartbeatResponse
-	(*GrantedRegion)(nil),     // 5: greptime.v1.meta.GrantedRegion
-	(*RegionLease)(nil),       // 6: greptime.v1.meta.RegionLease
-	(*AskLeaderRequest)(nil),  // 7: greptime.v1.meta.AskLeaderRequest
-	(*AskLeaderResponse)(nil), // 8: greptime.v1.meta.AskLeaderResponse
-	(*MailboxMessage)(nil),    // 9: greptime.v1.meta.MailboxMessage
-	nil,                       // 10: greptime.v1.meta.RegionStat.ExtensionsEntry
-	(*RequestHeader)(nil),     // 11: greptime.v1.meta.RequestHeader
-	(*Peer)(nil),              // 12: greptime.v1.meta.Peer
-	(*TimeInterval)(nil),      // 13: greptime.v1.meta.TimeInterval
-	(*ResponseHeader)(nil),    // 14: greptime.v1.meta.ResponseHeader
+	(*FlowStat)(nil),          // 4: greptime.v1.meta.FlowStat
+	(*HeartbeatResponse)(nil), // 5: greptime.v1.meta.HeartbeatResponse
+	(*GrantedRegion)(nil),     // 6: greptime.v1.meta.GrantedRegion
+	(*RegionLease)(nil),       // 7: greptime.v1.meta.RegionLease
+	(*AskLeaderRequest)(nil),  // 8: greptime.v1.meta.AskLeaderRequest
+	(*AskLeaderResponse)(nil), // 9: greptime.v1.meta.AskLeaderResponse
+	(*MailboxMessage)(nil),    // 10: greptime.v1.meta.MailboxMessage
+	nil,                       // 11: greptime.v1.meta.RegionStat.ExtensionsEntry
+	nil,                       // 12: greptime.v1.meta.FlowStat.FlowStatSizeEntry
+	(*RequestHeader)(nil),     // 13: greptime.v1.meta.RequestHeader
+	(*Peer)(nil),              // 14: greptime.v1.meta.Peer
+	(*TimeInterval)(nil),      // 15: greptime.v1.meta.TimeInterval
+	(*ResponseHeader)(nil),    // 16: greptime.v1.meta.ResponseHeader
 }
 var file_greptime_v1_meta_heartbeat_proto_depIdxs = []int32{
-	11, // 0: greptime.v1.meta.HeartbeatRequest.header:type_name -> greptime.v1.meta.RequestHeader
-	12, // 1: greptime.v1.meta.HeartbeatRequest.peer:type_name -> greptime.v1.meta.Peer
-	13, // 2: greptime.v1.meta.HeartbeatRequest.report_interval:type_name -> greptime.v1.meta.TimeInterval
+	13, // 0: greptime.v1.meta.HeartbeatRequest.header:type_name -> greptime.v1.meta.RequestHeader
+	14, // 1: greptime.v1.meta.HeartbeatRequest.peer:type_name -> greptime.v1.meta.Peer
+	15, // 2: greptime.v1.meta.HeartbeatRequest.report_interval:type_name -> greptime.v1.meta.TimeInterval
 	3,  // 3: greptime.v1.meta.HeartbeatRequest.region_stats:type_name -> greptime.v1.meta.RegionStat
-	9,  // 4: greptime.v1.meta.HeartbeatRequest.mailbox_message:type_name -> greptime.v1.meta.MailboxMessage
+	10, // 4: greptime.v1.meta.HeartbeatRequest.mailbox_message:type_name -> greptime.v1.meta.MailboxMessage
 	2,  // 5: greptime.v1.meta.HeartbeatRequest.info:type_name -> greptime.v1.meta.NodeInfo
-	0,  // 6: greptime.v1.meta.RegionStat.role:type_name -> greptime.v1.meta.RegionRole
-	10, // 7: greptime.v1.meta.RegionStat.extensions:type_name -> greptime.v1.meta.RegionStat.ExtensionsEntry
-	14, // 8: greptime.v1.meta.HeartbeatResponse.header:type_name -> greptime.v1.meta.ResponseHeader
-	9,  // 9: greptime.v1.meta.HeartbeatResponse.mailbox_message:type_name -> greptime.v1.meta.MailboxMessage
-	6,  // 10: greptime.v1.meta.HeartbeatResponse.region_lease:type_name -> greptime.v1.meta.RegionLease
-	0,  // 11: greptime.v1.meta.GrantedRegion.role:type_name -> greptime.v1.meta.RegionRole
-	5,  // 12: greptime.v1.meta.RegionLease.regions:type_name -> greptime.v1.meta.GrantedRegion
-	11, // 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
-	12, // 15: greptime.v1.meta.AskLeaderResponse.leader:type_name -> greptime.v1.meta.Peer
-	1,  // 16: greptime.v1.meta.Heartbeat.Heartbeat:input_type -> greptime.v1.meta.HeartbeatRequest
-	7,  // 17: greptime.v1.meta.Heartbeat.AskLeader:input_type -> greptime.v1.meta.AskLeaderRequest
-	4,  // 18: greptime.v1.meta.Heartbeat.Heartbeat:output_type -> greptime.v1.meta.HeartbeatResponse
-	8,  // 19: greptime.v1.meta.Heartbeat.AskLeader:output_type -> greptime.v1.meta.AskLeaderResponse
-	18, // [18:20] is the sub-list for method output_type
-	16, // [16:18] is the sub-list for method input_type
-	16, // [16:16] is the sub-list for extension type_name
-	16, // [16:16] is the sub-list for extension extendee
-	0,  // [0:16] is the sub-list for field type_name
+	4,  // 6: greptime.v1.meta.HeartbeatRequest.flow_stat:type_name -> greptime.v1.meta.FlowStat
+	0,  // 7: greptime.v1.meta.RegionStat.role:type_name -> greptime.v1.meta.RegionRole
+	11, // 8: greptime.v1.meta.RegionStat.extensions:type_name -> greptime.v1.meta.RegionStat.ExtensionsEntry
+	12, // 9: greptime.v1.meta.FlowStat.flow_stat_size:type_name -> greptime.v1.meta.FlowStat.FlowStatSizeEntry
+	16, // 10: greptime.v1.meta.HeartbeatResponse.header:type_name -> greptime.v1.meta.ResponseHeader
+	10, // 11: greptime.v1.meta.HeartbeatResponse.mailbox_message:type_name -> greptime.v1.meta.MailboxMessage
+	7,  // 12: greptime.v1.meta.HeartbeatResponse.region_lease:type_name -> greptime.v1.meta.RegionLease
+	0,  // 13: greptime.v1.meta.GrantedRegion.role:type_name -> greptime.v1.meta.RegionRole
+	6,  // 14: greptime.v1.meta.RegionLease.regions:type_name -> greptime.v1.meta.GrantedRegion
+	13, // 15: greptime.v1.meta.AskLeaderRequest.header:type_name -> greptime.v1.meta.RequestHeader
+	16, // 16: greptime.v1.meta.AskLeaderResponse.header:type_name -> greptime.v1.meta.ResponseHeader
+	14, // 17: greptime.v1.meta.AskLeaderResponse.leader:type_name -> greptime.v1.meta.Peer
+	1,  // 18: greptime.v1.meta.Heartbeat.Heartbeat:input_type -> greptime.v1.meta.HeartbeatRequest
+	8,  // 19: greptime.v1.meta.Heartbeat.AskLeader:input_type -> greptime.v1.meta.AskLeaderRequest
+	5,  // 20: greptime.v1.meta.Heartbeat.Heartbeat:output_type -> greptime.v1.meta.HeartbeatResponse
+	9,  // 21: greptime.v1.meta.Heartbeat.AskLeader:output_type -> greptime.v1.meta.AskLeaderResponse
+	20, // [20:22] is the sub-list for method output_type
+	18, // [18:20] is the sub-list for method input_type
+	18, // [18:18] is the sub-list for extension type_name
+	18, // [18:18] is the sub-list for extension extendee
+	0,  // [0:18] is the sub-list for field type_name
 }
 
 func init() { file_greptime_v1_meta_heartbeat_proto_init() }
@@ -1015,7 +1092,7 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			}
 		}
 		file_greptime_v1_meta_heartbeat_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*HeartbeatResponse); i {
+			switch v := v.(*FlowStat); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1027,7 +1104,7 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			}
 		}
 		file_greptime_v1_meta_heartbeat_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GrantedRegion); i {
+			switch v := v.(*HeartbeatResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1039,7 +1116,7 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			}
 		}
 		file_greptime_v1_meta_heartbeat_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RegionLease); i {
+			switch v := v.(*GrantedRegion); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1051,7 +1128,7 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			}
 		}
 		file_greptime_v1_meta_heartbeat_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*AskLeaderRequest); i {
+			switch v := v.(*RegionLease); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1063,7 +1140,7 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			}
 		}
 		file_greptime_v1_meta_heartbeat_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*AskLeaderResponse); i {
+			switch v := v.(*AskLeaderRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1075,6 +1152,18 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			}
 		}
 		file_greptime_v1_meta_heartbeat_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*AskLeaderResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_greptime_v1_meta_heartbeat_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*MailboxMessage); i {
 			case 0:
 				return &v.state
@@ -1087,7 +1176,7 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			}
 		}
 	}
-	file_greptime_v1_meta_heartbeat_proto_msgTypes[8].OneofWrappers = []interface{}{
+	file_greptime_v1_meta_heartbeat_proto_msgTypes[9].OneofWrappers = []interface{}{
 		(*MailboxMessage_Json)(nil),
 	}
 	type x struct{}
@@ -1096,7 +1185,7 @@ func file_greptime_v1_meta_heartbeat_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_greptime_v1_meta_heartbeat_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   10,
+			NumMessages:   12,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/java/src/main/java/greptime/v1/meta/HeartbeatOuterClass.java b/java/src/main/java/greptime/v1/meta/HeartbeatOuterClass.java
index 47c736c..74f5969 100644
--- a/java/src/main/java/greptime/v1/meta/HeartbeatOuterClass.java
+++ b/java/src/main/java/greptime/v1/meta/HeartbeatOuterClass.java
@@ -37,9 +37,10 @@ public final class HeartbeatOuterClass {
     Follower(1),
     /**
      * <pre>
-     * A downgrading region, which is in the process of downgrading from Leader to Follower.
-     * 
-     * This role is used to prevent the region from being written during the downgrade process.
+     * A downgrading region, which is in the process of downgrading from Leader to
+     * Follower.
+     * This role is used to prevent the region from being written during the
+     * downgrade process.
      * </pre>
      *
      * <code>DowngradingLeader = 2;</code>
@@ -66,9 +67,10 @@ public final class HeartbeatOuterClass {
     public static final int Follower_VALUE = 1;
     /**
      * <pre>
-     * A downgrading region, which is in the process of downgrading from Leader to Follower.
-     * 
-     * This role is used to prevent the region from being written during the downgrade process.
+     * A downgrading region, which is in the process of downgrading from Leader to
+     * Follower.
+     * This role is used to prevent the region from being written during the
+     * downgrade process.
      * </pre>
      *
      * <code>DowngradingLeader = 2;</code>
@@ -337,6 +339,21 @@ public final class HeartbeatOuterClass {
      * <code>.greptime.v1.meta.NodeInfo info = 8;</code>
      */
     greptime.v1.meta.HeartbeatOuterClass.NodeInfoOrBuilder getInfoOrBuilder();
+
+    /**
+     * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+     * @return Whether the flowStat field is set.
+     */
+    boolean hasFlowStat();
+    /**
+     * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+     * @return The flowStat.
+     */
+    greptime.v1.meta.HeartbeatOuterClass.FlowStat getFlowStat();
+    /**
+     * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+     */
+    greptime.v1.meta.HeartbeatOuterClass.FlowStatOrBuilder getFlowStatOrBuilder();
   }
   /**
    * Protobuf type {@code greptime.v1.meta.HeartbeatRequest}
@@ -469,6 +486,19 @@ public final class HeartbeatOuterClass {
 
               break;
             }
+            case 74: {
+              greptime.v1.meta.HeartbeatOuterClass.FlowStat.Builder subBuilder = null;
+              if (flowStat_ != null) {
+                subBuilder = flowStat_.toBuilder();
+              }
+              flowStat_ = input.readMessage(greptime.v1.meta.HeartbeatOuterClass.FlowStat.parser(), extensionRegistry);
+              if (subBuilder != null) {
+                subBuilder.mergeFrom(flowStat_);
+                flowStat_ = subBuilder.buildPartial();
+              }
+
+              break;
+            }
             default: {
               if (!parseUnknownField(
                   input, unknownFields, extensionRegistry, tag)) {
@@ -762,6 +792,32 @@ public final class HeartbeatOuterClass {
       return getInfo();
     }
 
+    public static final int FLOW_STAT_FIELD_NUMBER = 9;
+    private greptime.v1.meta.HeartbeatOuterClass.FlowStat flowStat_;
+    /**
+     * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+     * @return Whether the flowStat field is set.
+     */
+    @java.lang.Override
+    public boolean hasFlowStat() {
+      return flowStat_ != null;
+    }
+    /**
+     * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+     * @return The flowStat.
+     */
+    @java.lang.Override
+    public greptime.v1.meta.HeartbeatOuterClass.FlowStat getFlowStat() {
+      return flowStat_ == null ? greptime.v1.meta.HeartbeatOuterClass.FlowStat.getDefaultInstance() : flowStat_;
+    }
+    /**
+     * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+     */
+    @java.lang.Override
+    public greptime.v1.meta.HeartbeatOuterClass.FlowStatOrBuilder getFlowStatOrBuilder() {
+      return getFlowStat();
+    }
+
     private byte memoizedIsInitialized = -1;
     @java.lang.Override
     public final boolean isInitialized() {
@@ -800,6 +856,9 @@ public final class HeartbeatOuterClass {
       if (info_ != null) {
         output.writeMessage(8, getInfo());
       }
+      if (flowStat_ != null) {
+        output.writeMessage(9, getFlowStat());
+      }
       unknownFields.writeTo(output);
     }
 
@@ -841,6 +900,10 @@ public final class HeartbeatOuterClass {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(8, getInfo());
       }
+      if (flowStat_ != null) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeMessageSize(9, getFlowStat());
+      }
       size += unknownFields.getSerializedSize();
       memoizedSize = size;
       return size;
@@ -887,6 +950,11 @@ public final class HeartbeatOuterClass {
         if (!getInfo()
             .equals(other.getInfo())) return false;
       }
+      if (hasFlowStat() != other.hasFlowStat()) return false;
+      if (hasFlowStat()) {
+        if (!getFlowStat()
+            .equals(other.getFlowStat())) return false;
+      }
       if (!unknownFields.equals(other.unknownFields)) return false;
       return true;
     }
@@ -928,6 +996,10 @@ public final class HeartbeatOuterClass {
         hash = (37 * hash) + INFO_FIELD_NUMBER;
         hash = (53 * hash) + getInfo().hashCode();
       }
+      if (hasFlowStat()) {
+        hash = (37 * hash) + FLOW_STAT_FIELD_NUMBER;
+        hash = (53 * hash) + getFlowStat().hashCode();
+      }
       hash = (29 * hash) + unknownFields.hashCode();
       memoizedHashCode = hash;
       return hash;
@@ -1102,6 +1174,12 @@ public final class HeartbeatOuterClass {
           info_ = null;
           infoBuilder_ = null;
         }
+        if (flowStatBuilder_ == null) {
+          flowStat_ = null;
+        } else {
+          flowStat_ = null;
+          flowStatBuilder_ = null;
+        }
         return this;
       }
 
@@ -1165,6 +1243,11 @@ public final class HeartbeatOuterClass {
         } else {
           result.info_ = infoBuilder_.build();
         }
+        if (flowStatBuilder_ == null) {
+          result.flowStat_ = flowStat_;
+        } else {
+          result.flowStat_ = flowStatBuilder_.build();
+        }
         onBuilt();
         return result;
       }
@@ -1260,6 +1343,9 @@ public final class HeartbeatOuterClass {
         if (other.hasInfo()) {
           mergeInfo(other.getInfo());
         }
+        if (other.hasFlowStat()) {
+          mergeFlowStat(other.getFlowStat());
+        }
         this.mergeUnknownFields(other.unknownFields);
         onChanged();
         return this;
@@ -2390,6 +2476,125 @@ public final class HeartbeatOuterClass {
         }
         return infoBuilder_;
       }
+
+      private greptime.v1.meta.HeartbeatOuterClass.FlowStat flowStat_;
+      private com.google.protobuf.SingleFieldBuilderV3<
+          greptime.v1.meta.HeartbeatOuterClass.FlowStat, greptime.v1.meta.HeartbeatOuterClass.FlowStat.Builder, greptime.v1.meta.HeartbeatOuterClass.FlowStatOrBuilder> flowStatBuilder_;
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       * @return Whether the flowStat field is set.
+       */
+      public boolean hasFlowStat() {
+        return flowStatBuilder_ != null || flowStat_ != null;
+      }
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       * @return The flowStat.
+       */
+      public greptime.v1.meta.HeartbeatOuterClass.FlowStat getFlowStat() {
+        if (flowStatBuilder_ == null) {
+          return flowStat_ == null ? greptime.v1.meta.HeartbeatOuterClass.FlowStat.getDefaultInstance() : flowStat_;
+        } else {
+          return flowStatBuilder_.getMessage();
+        }
+      }
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       */
+      public Builder setFlowStat(greptime.v1.meta.HeartbeatOuterClass.FlowStat value) {
+        if (flowStatBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          flowStat_ = value;
+          onChanged();
+        } else {
+          flowStatBuilder_.setMessage(value);
+        }
+
+        return this;
+      }
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       */
+      public Builder setFlowStat(
+          greptime.v1.meta.HeartbeatOuterClass.FlowStat.Builder builderForValue) {
+        if (flowStatBuilder_ == null) {
+          flowStat_ = builderForValue.build();
+          onChanged();
+        } else {
+          flowStatBuilder_.setMessage(builderForValue.build());
+        }
+
+        return this;
+      }
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       */
+      public Builder mergeFlowStat(greptime.v1.meta.HeartbeatOuterClass.FlowStat value) {
+        if (flowStatBuilder_ == null) {
+          if (flowStat_ != null) {
+            flowStat_ =
+              greptime.v1.meta.HeartbeatOuterClass.FlowStat.newBuilder(flowStat_).mergeFrom(value).buildPartial();
+          } else {
+            flowStat_ = value;
+          }
+          onChanged();
+        } else {
+          flowStatBuilder_.mergeFrom(value);
+        }
+
+        return this;
+      }
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       */
+      public Builder clearFlowStat() {
+        if (flowStatBuilder_ == null) {
+          flowStat_ = null;
+          onChanged();
+        } else {
+          flowStat_ = null;
+          flowStatBuilder_ = null;
+        }
+
+        return this;
+      }
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       */
+      public greptime.v1.meta.HeartbeatOuterClass.FlowStat.Builder getFlowStatBuilder() {
+        
+        onChanged();
+        return getFlowStatFieldBuilder().getBuilder();
+      }
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       */
+      public greptime.v1.meta.HeartbeatOuterClass.FlowStatOrBuilder getFlowStatOrBuilder() {
+        if (flowStatBuilder_ != null) {
+          return flowStatBuilder_.getMessageOrBuilder();
+        } else {
+          return flowStat_ == null ?
+              greptime.v1.meta.HeartbeatOuterClass.FlowStat.getDefaultInstance() : flowStat_;
+        }
+      }
+      /**
+       * <code>.greptime.v1.meta.FlowStat flow_stat = 9;</code>
+       */
+      private com.google.protobuf.SingleFieldBuilderV3<
+          greptime.v1.meta.HeartbeatOuterClass.FlowStat, greptime.v1.meta.HeartbeatOuterClass.FlowStat.Builder, greptime.v1.meta.HeartbeatOuterClass.FlowStatOrBuilder> 
+          getFlowStatFieldBuilder() {
+        if (flowStatBuilder_ == null) {
+          flowStatBuilder_ = new com.google.protobuf.SingleFieldBuilderV3<
+              greptime.v1.meta.HeartbeatOuterClass.FlowStat, greptime.v1.meta.HeartbeatOuterClass.FlowStat.Builder, greptime.v1.meta.HeartbeatOuterClass.FlowStatOrBuilder>(
+                  getFlowStat(),
+                  getParentForChildren(),
+                  isClean());
+          flowStat_ = null;
+        }
+        return flowStatBuilder_;
+      }
       @java.lang.Override
       public final Builder setUnknownFields(
           final com.google.protobuf.UnknownFieldSet unknownFields) {
@@ -4744,6 +4949,842 @@ com.google.protobuf.ByteString defaultValue);
 
   }
 
+  public interface FlowStatOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:greptime.v1.meta.FlowStat)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+    int getFlowStatSizeCount();
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+    boolean containsFlowStatSize(
+        int key);
+    /**
+     * Use {@link #getFlowStatSizeMap()} instead.
+     */
+    @java.lang.Deprecated
+    java.util.Map<java.lang.Integer, java.lang.Long>
+    getFlowStatSize();
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+    java.util.Map<java.lang.Integer, java.lang.Long>
+    getFlowStatSizeMap();
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+
+    long getFlowStatSizeOrDefault(
+        int key,
+        long defaultValue);
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+
+    long getFlowStatSizeOrThrow(
+        int key);
+  }
+  /**
+   * Protobuf type {@code greptime.v1.meta.FlowStat}
+   */
+  public static final class FlowStat extends
+      com.google.protobuf.GeneratedMessageV3 implements
+      // @@protoc_insertion_point(message_implements:greptime.v1.meta.FlowStat)
+      FlowStatOrBuilder {
+  private static final long serialVersionUID = 0L;
+    // Use FlowStat.newBuilder() to construct.
+    private FlowStat(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+    private FlowStat() {
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(
+        UnusedPrivateParameter unused) {
+      return new FlowStat();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet
+    getUnknownFields() {
+      return this.unknownFields;
+    }
+    private FlowStat(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      this();
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      int mutable_bitField0_ = 0;
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              if (!((mutable_bitField0_ & 0x00000001) != 0)) {
+                flowStatSize_ = com.google.protobuf.MapField.newMapField(
+                    FlowStatSizeDefaultEntryHolder.defaultEntry);
+                mutable_bitField0_ |= 0x00000001;
+              }
+              com.google.protobuf.MapEntry<java.lang.Integer, java.lang.Long>
+              flowStatSize__ = input.readMessage(
+                  FlowStatSizeDefaultEntryHolder.defaultEntry.getParserForType(), extensionRegistry);
+              flowStatSize_.getMutableMap().put(
+                  flowStatSize__.getKey(), flowStatSize__.getValue());
+              break;
+            }
+            default: {
+              if (!parseUnknownField(
+                  input, unknownFields, extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(
+            e).setUnfinishedMessage(this);
+      } finally {
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return greptime.v1.meta.HeartbeatOuterClass.internal_static_greptime_v1_meta_FlowStat_descriptor;
+    }
+
+    @SuppressWarnings({"rawtypes"})
+    @java.lang.Override
+    protected com.google.protobuf.MapField internalGetMapField(
+        int number) {
+      switch (number) {
+        case 1:
+          return internalGetFlowStatSize();
+        default:
+          throw new RuntimeException(
+              "Invalid map field number: " + number);
+      }
+    }
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return greptime.v1.meta.HeartbeatOuterClass.internal_static_greptime_v1_meta_FlowStat_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              greptime.v1.meta.HeartbeatOuterClass.FlowStat.class, greptime.v1.meta.HeartbeatOuterClass.FlowStat.Builder.class);
+    }
+
+    public static final int FLOW_STAT_SIZE_FIELD_NUMBER = 1;
+    private static final class FlowStatSizeDefaultEntryHolder {
+      static final com.google.protobuf.MapEntry<
+          java.lang.Integer, java.lang.Long> defaultEntry =
+              com.google.protobuf.MapEntry
+              .<java.lang.Integer, java.lang.Long>newDefaultInstance(
+                  greptime.v1.meta.HeartbeatOuterClass.internal_static_greptime_v1_meta_FlowStat_FlowStatSizeEntry_descriptor, 
+                  com.google.protobuf.WireFormat.FieldType.UINT32,
+                  0,
+                  com.google.protobuf.WireFormat.FieldType.UINT64,
+                  0L);
+    }
+    private com.google.protobuf.MapField<
+        java.lang.Integer, java.lang.Long> flowStatSize_;
+    private com.google.protobuf.MapField<java.lang.Integer, java.lang.Long>
+    internalGetFlowStatSize() {
+      if (flowStatSize_ == null) {
+        return com.google.protobuf.MapField.emptyMapField(
+            FlowStatSizeDefaultEntryHolder.defaultEntry);
+      }
+      return flowStatSize_;
+    }
+
+    public int getFlowStatSizeCount() {
+      return internalGetFlowStatSize().getMap().size();
+    }
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+
+    @java.lang.Override
+    public boolean containsFlowStatSize(
+        int key) {
+      
+      return internalGetFlowStatSize().getMap().containsKey(key);
+    }
+    /**
+     * Use {@link #getFlowStatSizeMap()} instead.
+     */
+    @java.lang.Override
+    @java.lang.Deprecated
+    public java.util.Map<java.lang.Integer, java.lang.Long> getFlowStatSize() {
+      return getFlowStatSizeMap();
+    }
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+    @java.lang.Override
+
+    public java.util.Map<java.lang.Integer, java.lang.Long> getFlowStatSizeMap() {
+      return internalGetFlowStatSize().getMap();
+    }
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+    @java.lang.Override
+
+    public long getFlowStatSizeOrDefault(
+        int key,
+        long defaultValue) {
+      
+      java.util.Map<java.lang.Integer, java.lang.Long> map =
+          internalGetFlowStatSize().getMap();
+      return map.containsKey(key) ? map.get(key) : defaultValue;
+    }
+    /**
+     * <pre>
+     * Each flow's in mem state's size in bytes
+     * due to protobuf's key can't be a message, so we use uint32 as the key which
+     * is [`FlowId`]'s inner field `id`
+     * </pre>
+     *
+     * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+     */
+    @java.lang.Override
+
+    public long getFlowStatSizeOrThrow(
+        int key) {
+      
+      java.util.Map<java.lang.Integer, java.lang.Long> map =
+          internalGetFlowStatSize().getMap();
+      if (!map.containsKey(key)) {
+        throw new java.lang.IllegalArgumentException();
+      }
+      return map.get(key);
+    }
+
+    private byte memoizedIsInitialized = -1;
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      com.google.protobuf.GeneratedMessageV3
+        .serializeIntegerMapTo(
+          output,
+          internalGetFlowStatSize(),
+          FlowStatSizeDefaultEntryHolder.defaultEntry,
+          1);
+      unknownFields.writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      for (java.util.Map.Entry<java.lang.Integer, java.lang.Long> entry
+           : internalGetFlowStatSize().getMap().entrySet()) {
+        com.google.protobuf.MapEntry<java.lang.Integer, java.lang.Long>
+        flowStatSize__ = FlowStatSizeDefaultEntryHolder.defaultEntry.newBuilderForType()
+            .setKey(entry.getKey())
+            .setValue(entry.getValue())
+            .build();
+        size += com.google.protobuf.CodedOutputStream
+            .computeMessageSize(1, flowStatSize__);
+      }
+      size += unknownFields.getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof greptime.v1.meta.HeartbeatOuterClass.FlowStat)) {
+        return super.equals(obj);
+      }
+      greptime.v1.meta.HeartbeatOuterClass.FlowStat other = (greptime.v1.meta.HeartbeatOuterClass.FlowStat) obj;
+
+      if (!internalGetFlowStatSize().equals(
+          other.internalGetFlowStatSize())) return false;
+      if (!unknownFields.equals(other.unknownFields)) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (!internalGetFlowStatSize().getMap().isEmpty()) {
+        hash = (37 * hash) + FLOW_STAT_SIZE_FIELD_NUMBER;
+        hash = (53 * hash) + internalGetFlowStatSize().hashCode();
+      }
+      hash = (29 * hash) + unknownFields.hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(greptime.v1.meta.HeartbeatOuterClass.FlowStat prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * Protobuf type {@code greptime.v1.meta.FlowStat}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
+        // @@protoc_insertion_point(builder_implements:greptime.v1.meta.FlowStat)
+        greptime.v1.meta.HeartbeatOuterClass.FlowStatOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return greptime.v1.meta.HeartbeatOuterClass.internal_static_greptime_v1_meta_FlowStat_descriptor;
+      }
+
+      @SuppressWarnings({"rawtypes"})
+      protected com.google.protobuf.MapField internalGetMapField(
+          int number) {
+        switch (number) {
+          case 1:
+            return internalGetFlowStatSize();
+          default:
+            throw new RuntimeException(
+                "Invalid map field number: " + number);
+        }
+      }
+      @SuppressWarnings({"rawtypes"})
+      protected com.google.protobuf.MapField internalGetMutableMapField(
+          int number) {
+        switch (number) {
+          case 1:
+            return internalGetMutableFlowStatSize();
+          default:
+            throw new RuntimeException(
+                "Invalid map field number: " + number);
+        }
+      }
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return greptime.v1.meta.HeartbeatOuterClass.internal_static_greptime_v1_meta_FlowStat_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                greptime.v1.meta.HeartbeatOuterClass.FlowStat.class, greptime.v1.meta.HeartbeatOuterClass.FlowStat.Builder.class);
+      }
+
+      // Construct using greptime.v1.meta.HeartbeatOuterClass.FlowStat.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+        }
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        internalGetMutableFlowStatSize().clear();
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return greptime.v1.meta.HeartbeatOuterClass.internal_static_greptime_v1_meta_FlowStat_descriptor;
+      }
+
+      @java.lang.Override
+      public greptime.v1.meta.HeartbeatOuterClass.FlowStat getDefaultInstanceForType() {
+        return greptime.v1.meta.HeartbeatOuterClass.FlowStat.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public greptime.v1.meta.HeartbeatOuterClass.FlowStat build() {
+        greptime.v1.meta.HeartbeatOuterClass.FlowStat result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public greptime.v1.meta.HeartbeatOuterClass.FlowStat buildPartial() {
+        greptime.v1.meta.HeartbeatOuterClass.FlowStat result = new greptime.v1.meta.HeartbeatOuterClass.FlowStat(this);
+        int from_bitField0_ = bitField0_;
+        result.flowStatSize_ = internalGetFlowStatSize();
+        result.flowStatSize_.makeImmutable();
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.setField(field, value);
+      }
+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof greptime.v1.meta.HeartbeatOuterClass.FlowStat) {
+          return mergeFrom((greptime.v1.meta.HeartbeatOuterClass.FlowStat)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(greptime.v1.meta.HeartbeatOuterClass.FlowStat other) {
+        if (other == greptime.v1.meta.HeartbeatOuterClass.FlowStat.getDefaultInstance()) return this;
+        internalGetMutableFlowStatSize().mergeFrom(
+            other.internalGetFlowStatSize());
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        greptime.v1.meta.HeartbeatOuterClass.FlowStat parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage = (greptime.v1.meta.HeartbeatOuterClass.FlowStat) e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+      private int bitField0_;
+
+      private com.google.protobuf.MapField<
+          java.lang.Integer, java.lang.Long> flowStatSize_;
+      private com.google.protobuf.MapField<java.lang.Integer, java.lang.Long>
+      internalGetFlowStatSize() {
+        if (flowStatSize_ == null) {
+          return com.google.protobuf.MapField.emptyMapField(
+              FlowStatSizeDefaultEntryHolder.defaultEntry);
+        }
+        return flowStatSize_;
+      }
+      private com.google.protobuf.MapField<java.lang.Integer, java.lang.Long>
+      internalGetMutableFlowStatSize() {
+        onChanged();;
+        if (flowStatSize_ == null) {
+          flowStatSize_ = com.google.protobuf.MapField.newMapField(
+              FlowStatSizeDefaultEntryHolder.defaultEntry);
+        }
+        if (!flowStatSize_.isMutable()) {
+          flowStatSize_ = flowStatSize_.copy();
+        }
+        return flowStatSize_;
+      }
+
+      public int getFlowStatSizeCount() {
+        return internalGetFlowStatSize().getMap().size();
+      }
+      /**
+       * <pre>
+       * Each flow's in mem state's size in bytes
+       * due to protobuf's key can't be a message, so we use uint32 as the key which
+       * is [`FlowId`]'s inner field `id`
+       * </pre>
+       *
+       * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+       */
+
+      @java.lang.Override
+      public boolean containsFlowStatSize(
+          int key) {
+        
+        return internalGetFlowStatSize().getMap().containsKey(key);
+      }
+      /**
+       * Use {@link #getFlowStatSizeMap()} instead.
+       */
+      @java.lang.Override
+      @java.lang.Deprecated
+      public java.util.Map<java.lang.Integer, java.lang.Long> getFlowStatSize() {
+        return getFlowStatSizeMap();
+      }
+      /**
+       * <pre>
+       * Each flow's in mem state's size in bytes
+       * due to protobuf's key can't be a message, so we use uint32 as the key which
+       * is [`FlowId`]'s inner field `id`
+       * </pre>
+       *
+       * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+       */
+      @java.lang.Override
+
+      public java.util.Map<java.lang.Integer, java.lang.Long> getFlowStatSizeMap() {
+        return internalGetFlowStatSize().getMap();
+      }
+      /**
+       * <pre>
+       * Each flow's in mem state's size in bytes
+       * due to protobuf's key can't be a message, so we use uint32 as the key which
+       * is [`FlowId`]'s inner field `id`
+       * </pre>
+       *
+       * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+       */
+      @java.lang.Override
+
+      public long getFlowStatSizeOrDefault(
+          int key,
+          long defaultValue) {
+        
+        java.util.Map<java.lang.Integer, java.lang.Long> map =
+            internalGetFlowStatSize().getMap();
+        return map.containsKey(key) ? map.get(key) : defaultValue;
+      }
+      /**
+       * <pre>
+       * Each flow's in mem state's size in bytes
+       * due to protobuf's key can't be a message, so we use uint32 as the key which
+       * is [`FlowId`]'s inner field `id`
+       * </pre>
+       *
+       * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+       */
+      @java.lang.Override
+
+      public long getFlowStatSizeOrThrow(
+          int key) {
+        
+        java.util.Map<java.lang.Integer, java.lang.Long> map =
+            internalGetFlowStatSize().getMap();
+        if (!map.containsKey(key)) {
+          throw new java.lang.IllegalArgumentException();
+        }
+        return map.get(key);
+      }
+
+      public Builder clearFlowStatSize() {
+        internalGetMutableFlowStatSize().getMutableMap()
+            .clear();
+        return this;
+      }
+      /**
+       * <pre>
+       * Each flow's in mem state's size in bytes
+       * due to protobuf's key can't be a message, so we use uint32 as the key which
+       * is [`FlowId`]'s inner field `id`
+       * </pre>
+       *
+       * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+       */
+
+      public Builder removeFlowStatSize(
+          int key) {
+        
+        internalGetMutableFlowStatSize().getMutableMap()
+            .remove(key);
+        return this;
+      }
+      /**
+       * Use alternate mutation accessors instead.
+       */
+      @java.lang.Deprecated
+      public java.util.Map<java.lang.Integer, java.lang.Long>
+      getMutableFlowStatSize() {
+        return internalGetMutableFlowStatSize().getMutableMap();
+      }
+      /**
+       * <pre>
+       * Each flow's in mem state's size in bytes
+       * due to protobuf's key can't be a message, so we use uint32 as the key which
+       * is [`FlowId`]'s inner field `id`
+       * </pre>
+       *
+       * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+       */
+      public Builder putFlowStatSize(
+          int key,
+          long value) {
+        
+        
+        internalGetMutableFlowStatSize().getMutableMap()
+            .put(key, value);
+        return this;
+      }
+      /**
+       * <pre>
+       * Each flow's in mem state's size in bytes
+       * due to protobuf's key can't be a message, so we use uint32 as the key which
+       * is [`FlowId`]'s inner field `id`
+       * </pre>
+       *
+       * <code>map&lt;uint32, uint64&gt; flow_stat_size = 1;</code>
+       */
+
+      public Builder putAllFlowStatSize(
+          java.util.Map<java.lang.Integer, java.lang.Long> values) {
+        internalGetMutableFlowStatSize().getMutableMap()
+            .putAll(values);
+        return this;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:greptime.v1.meta.FlowStat)
+    }
+
+    // @@protoc_insertion_point(class_scope:greptime.v1.meta.FlowStat)
+    private static final greptime.v1.meta.HeartbeatOuterClass.FlowStat DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new greptime.v1.meta.HeartbeatOuterClass.FlowStat();
+    }
+
+    public static greptime.v1.meta.HeartbeatOuterClass.FlowStat getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<FlowStat>
+        PARSER = new com.google.protobuf.AbstractParser<FlowStat>() {
+      @java.lang.Override
+      public FlowStat parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return new FlowStat(input, extensionRegistry);
+      }
+    };
+
+    public static com.google.protobuf.Parser<FlowStat> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<FlowStat> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public greptime.v1.meta.HeartbeatOuterClass.FlowStat getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
   public interface HeartbeatResponseOrBuilder extends
       // @@protoc_insertion_point(interface_extends:greptime.v1.meta.HeartbeatResponse)
       com.google.protobuf.MessageOrBuilder {
@@ -10336,6 +11377,16 @@ com.google.protobuf.ByteString defaultValue);
   private static final 
     com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
       internal_static_greptime_v1_meta_RegionStat_ExtensionsEntry_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_greptime_v1_meta_FlowStat_descriptor;
+  private static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_greptime_v1_meta_FlowStat_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_greptime_v1_meta_FlowStat_FlowStatSizeEntry_descriptor;
+  private static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_greptime_v1_meta_FlowStat_FlowStatSizeEntry_fieldAccessorTable;
   private static final com.google.protobuf.Descriptors.Descriptor
     internal_static_greptime_v1_meta_HeartbeatResponse_descriptor;
   private static final 
@@ -10377,7 +11428,7 @@ com.google.protobuf.ByteString defaultValue);
     java.lang.String[] descriptorData = {
       "\n greptime/v1/meta/heartbeat.proto\022\020grep" +
       "time.v1.meta\032\035greptime/v1/meta/common.pr" +
-      "oto\"\355\002\n\020HeartbeatRequest\022/\n\006header\030\001 \001(\013" +
+      "oto\"\234\003\n\020HeartbeatRequest\022/\n\006header\030\001 \001(\013" +
       "2\037.greptime.v1.meta.RequestHeader\022$\n\004pee" +
       "r\030\002 \001(\0132\026.greptime.v1.meta.Peer\0227\n\017repor" +
       "t_interval\030\003 \001(\0132\036.greptime.v1.meta.Time" +
@@ -10386,41 +11437,46 @@ com.google.protobuf.ByteString defaultValue);
       "\005 \001(\0132 .greptime.v1.meta.MailboxMessage\022" +
       "\034\n\024duration_since_epoch\030\006 \001(\004\022\022\n\nnode_ep" +
       "och\030\007 \001(\004\022(\n\004info\030\010 \001(\0132\032.greptime.v1.me" +
-      "ta.NodeInfo\"F\n\010NodeInfo\022\017\n\007version\030\001 \001(\t" +
-      "\022\022\n\ngit_commit\030\002 \001(\t\022\025\n\rstart_time_ms\030\003 " +
-      "\001(\004\"\207\002\n\nRegionStat\022\021\n\tregion_id\030\001 \001(\004\022\014\n" +
-      "\004rcus\030\002 \001(\003\022\014\n\004wcus\030\003 \001(\003\022\031\n\021approximate" +
-      "_bytes\030\004 \001(\003\022\016\n\006engine\030\006 \001(\t\022*\n\004role\030\007 \001" +
-      "(\0162\034.greptime.v1.meta.RegionRole\022@\n\nexte" +
-      "nsions\030c \003(\0132,.greptime.v1.meta.RegionSt" +
-      "at.ExtensionsEntry\0321\n\017ExtensionsEntry\022\013\n" +
-      "\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\014:\0028\001\"\265\001\n\021Heartb" +
-      "eatResponse\0220\n\006header\030\001 \001(\0132 .greptime.v" +
-      "1.meta.ResponseHeader\0229\n\017mailbox_message" +
-      "\030\002 \001(\0132 .greptime.v1.meta.MailboxMessage" +
-      "\0223\n\014region_lease\030\003 \001(\0132\035.greptime.v1.met" +
-      "a.RegionLease\"N\n\rGrantedRegion\022\021\n\tregion" +
-      "_id\030\001 \001(\004\022*\n\004role\030\002 \001(\0162\034.greptime.v1.me" +
-      "ta.RegionRole\"\222\001\n\013RegionLease\0220\n\007regions" +
-      "\030\001 \003(\0132\037.greptime.v1.meta.GrantedRegion\022" +
-      "\034\n\024duration_since_epoch\030\002 \001(\004\022\025\n\rlease_s" +
-      "econds\030\003 \001(\004\022\034\n\024closeable_region_ids\030\004 \003" +
-      "(\004\"C\n\020AskLeaderRequest\022/\n\006header\030\001 \001(\0132\037" +
-      ".greptime.v1.meta.RequestHeader\"m\n\021AskLe" +
-      "aderResponse\0220\n\006header\030\001 \001(\0132 .greptime." +
-      "v1.meta.ResponseHeader\022&\n\006leader\030\002 \001(\0132\026" +
-      ".greptime.v1.meta.Peer\"|\n\016MailboxMessage" +
-      "\022\n\n\002id\030\001 \001(\004\022\017\n\007subject\030\002 \001(\t\022\014\n\004from\030\003 " +
-      "\001(\t\022\n\n\002to\030\004 \001(\t\022\030\n\020timestamp_millis\030\005 \001(" +
-      "\003\022\016\n\004json\030\006 \001(\tH\000B\t\n\007payload*=\n\nRegionRo" +
-      "le\022\n\n\006Leader\020\000\022\014\n\010Follower\020\001\022\025\n\021Downgrad" +
-      "ingLeader\020\0022\277\001\n\tHeartbeat\022Z\n\tHeartbeat\022\"" +
-      ".greptime.v1.meta.HeartbeatRequest\032#.gre" +
-      "ptime.v1.meta.HeartbeatResponse\"\000(\0010\001\022V\n" +
-      "\tAskLeader\022\".greptime.v1.meta.AskLeaderR" +
-      "equest\032#.greptime.v1.meta.AskLeaderRespo" +
-      "nse\"\000B<Z:github.com/GreptimeTeam/greptim" +
-      "e-proto/go/greptime/v1/metab\006proto3"
+      "ta.NodeInfo\022-\n\tflow_stat\030\t \001(\0132\032.greptim" +
+      "e.v1.meta.FlowStat\"F\n\010NodeInfo\022\017\n\007versio" +
+      "n\030\001 \001(\t\022\022\n\ngit_commit\030\002 \001(\t\022\025\n\rstart_tim" +
+      "e_ms\030\003 \001(\004\"\207\002\n\nRegionStat\022\021\n\tregion_id\030\001" +
+      " \001(\004\022\014\n\004rcus\030\002 \001(\003\022\014\n\004wcus\030\003 \001(\003\022\031\n\021appr" +
+      "oximate_bytes\030\004 \001(\003\022\016\n\006engine\030\006 \001(\t\022*\n\004r" +
+      "ole\030\007 \001(\0162\034.greptime.v1.meta.RegionRole\022" +
+      "@\n\nextensions\030c \003(\0132,.greptime.v1.meta.R" +
+      "egionStat.ExtensionsEntry\0321\n\017ExtensionsE" +
+      "ntry\022\013\n\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\014:\0028\001\"\205\001\n" +
+      "\010FlowStat\022D\n\016flow_stat_size\030\001 \003(\0132,.grep" +
+      "time.v1.meta.FlowStat.FlowStatSizeEntry\032" +
+      "3\n\021FlowStatSizeEntry\022\013\n\003key\030\001 \001(\r\022\r\n\005val" +
+      "ue\030\002 \001(\004:\0028\001\"\265\001\n\021HeartbeatResponse\0220\n\006he" +
+      "ader\030\001 \001(\0132 .greptime.v1.meta.ResponseHe" +
+      "ader\0229\n\017mailbox_message\030\002 \001(\0132 .greptime" +
+      ".v1.meta.MailboxMessage\0223\n\014region_lease\030" +
+      "\003 \001(\0132\035.greptime.v1.meta.RegionLease\"N\n\r" +
+      "GrantedRegion\022\021\n\tregion_id\030\001 \001(\004\022*\n\004role" +
+      "\030\002 \001(\0162\034.greptime.v1.meta.RegionRole\"\222\001\n" +
+      "\013RegionLease\0220\n\007regions\030\001 \003(\0132\037.greptime" +
+      ".v1.meta.GrantedRegion\022\034\n\024duration_since" +
+      "_epoch\030\002 \001(\004\022\025\n\rlease_seconds\030\003 \001(\004\022\034\n\024c" +
+      "loseable_region_ids\030\004 \003(\004\"C\n\020AskLeaderRe" +
+      "quest\022/\n\006header\030\001 \001(\0132\037.greptime.v1.meta" +
+      ".RequestHeader\"m\n\021AskLeaderResponse\0220\n\006h" +
+      "eader\030\001 \001(\0132 .greptime.v1.meta.ResponseH" +
+      "eader\022&\n\006leader\030\002 \001(\0132\026.greptime.v1.meta" +
+      ".Peer\"|\n\016MailboxMessage\022\n\n\002id\030\001 \001(\004\022\017\n\007s" +
+      "ubject\030\002 \001(\t\022\014\n\004from\030\003 \001(\t\022\n\n\002to\030\004 \001(\t\022\030" +
+      "\n\020timestamp_millis\030\005 \001(\003\022\016\n\004json\030\006 \001(\tH\000" +
+      "B\t\n\007payload*=\n\nRegionRole\022\n\n\006Leader\020\000\022\014\n" +
+      "\010Follower\020\001\022\025\n\021DowngradingLeader\020\0022\277\001\n\tH" +
+      "eartbeat\022Z\n\tHeartbeat\022\".greptime.v1.meta" +
+      ".HeartbeatRequest\032#.greptime.v1.meta.Hea" +
+      "rtbeatResponse\"\000(\0010\001\022V\n\tAskLeader\022\".grep" +
+      "time.v1.meta.AskLeaderRequest\032#.greptime" +
+      ".v1.meta.AskLeaderResponse\"\000B<Z:github.c" +
+      "om/GreptimeTeam/greptime-proto/go/grepti" +
+      "me/v1/metab\006proto3"
     };
     descriptor = com.google.protobuf.Descriptors.FileDescriptor
       .internalBuildGeneratedFileFrom(descriptorData,
@@ -10432,7 +11488,7 @@ com.google.protobuf.ByteString defaultValue);
     internal_static_greptime_v1_meta_HeartbeatRequest_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_meta_HeartbeatRequest_descriptor,
-        new java.lang.String[] { "Header", "Peer", "ReportInterval", "RegionStats", "MailboxMessage", "DurationSinceEpoch", "NodeEpoch", "Info", });
+        new java.lang.String[] { "Header", "Peer", "ReportInterval", "RegionStats", "MailboxMessage", "DurationSinceEpoch", "NodeEpoch", "Info", "FlowStat", });
     internal_static_greptime_v1_meta_NodeInfo_descriptor =
       getDescriptor().getMessageTypes().get(1);
     internal_static_greptime_v1_meta_NodeInfo_fieldAccessorTable = new
@@ -10451,38 +11507,50 @@ com.google.protobuf.ByteString defaultValue);
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_meta_RegionStat_ExtensionsEntry_descriptor,
         new java.lang.String[] { "Key", "Value", });
-    internal_static_greptime_v1_meta_HeartbeatResponse_descriptor =
+    internal_static_greptime_v1_meta_FlowStat_descriptor =
       getDescriptor().getMessageTypes().get(3);
+    internal_static_greptime_v1_meta_FlowStat_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_greptime_v1_meta_FlowStat_descriptor,
+        new java.lang.String[] { "FlowStatSize", });
+    internal_static_greptime_v1_meta_FlowStat_FlowStatSizeEntry_descriptor =
+      internal_static_greptime_v1_meta_FlowStat_descriptor.getNestedTypes().get(0);
+    internal_static_greptime_v1_meta_FlowStat_FlowStatSizeEntry_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_greptime_v1_meta_FlowStat_FlowStatSizeEntry_descriptor,
+        new java.lang.String[] { "Key", "Value", });
+    internal_static_greptime_v1_meta_HeartbeatResponse_descriptor =
+      getDescriptor().getMessageTypes().get(4);
     internal_static_greptime_v1_meta_HeartbeatResponse_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_meta_HeartbeatResponse_descriptor,
         new java.lang.String[] { "Header", "MailboxMessage", "RegionLease", });
     internal_static_greptime_v1_meta_GrantedRegion_descriptor =
-      getDescriptor().getMessageTypes().get(4);
+      getDescriptor().getMessageTypes().get(5);
     internal_static_greptime_v1_meta_GrantedRegion_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_meta_GrantedRegion_descriptor,
         new java.lang.String[] { "RegionId", "Role", });
     internal_static_greptime_v1_meta_RegionLease_descriptor =
-      getDescriptor().getMessageTypes().get(5);
+      getDescriptor().getMessageTypes().get(6);
     internal_static_greptime_v1_meta_RegionLease_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_meta_RegionLease_descriptor,
         new java.lang.String[] { "Regions", "DurationSinceEpoch", "LeaseSeconds", "CloseableRegionIds", });
     internal_static_greptime_v1_meta_AskLeaderRequest_descriptor =
-      getDescriptor().getMessageTypes().get(6);
+      getDescriptor().getMessageTypes().get(7);
     internal_static_greptime_v1_meta_AskLeaderRequest_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_meta_AskLeaderRequest_descriptor,
         new java.lang.String[] { "Header", });
     internal_static_greptime_v1_meta_AskLeaderResponse_descriptor =
-      getDescriptor().getMessageTypes().get(7);
+      getDescriptor().getMessageTypes().get(8);
     internal_static_greptime_v1_meta_AskLeaderResponse_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_meta_AskLeaderResponse_descriptor,
         new java.lang.String[] { "Header", "Leader", });
     internal_static_greptime_v1_meta_MailboxMessage_descriptor =
-      getDescriptor().getMessageTypes().get(8);
+      getDescriptor().getMessageTypes().get(9);
     internal_static_greptime_v1_meta_MailboxMessage_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_greptime_v1_meta_MailboxMessage_descriptor,
diff --git a/proto/greptime/v1/meta/heartbeat.proto b/proto/greptime/v1/meta/heartbeat.proto
index ff2a397..3fe73dd 100644
--- a/proto/greptime/v1/meta/heartbeat.proto
+++ b/proto/greptime/v1/meta/heartbeat.proto
@@ -47,6 +47,7 @@ message HeartbeatRequest {
   // The node's epoch
   uint64 node_epoch = 7;
   NodeInfo info = 8;
+  FlowStat flow_stat = 9;
 }
 
 enum RegionRole {
@@ -54,9 +55,11 @@ enum RegionRole {
   Leader = 0;
   // Readonly region.
   Follower = 1;
-  // A downgrading region, which is in the process of downgrading from Leader to Follower.
-  // 
-  // This role is used to prevent the region from being written during the downgrade process.
+  // A downgrading region, which is in the process of downgrading from Leader to
+  // Follower.
+  //
+  // This role is used to prevent the region from being written during the
+  // downgrade process.
   DowngradingLeader = 2;
 }
 
@@ -84,6 +87,13 @@ message RegionStat {
   map<string, bytes> extensions = 99;
 }
 
+message FlowStat {
+  // Each flow's in mem state's size in bytes
+  // due to protobuf's key can't be a message, so we use uint32 as the key which
+  // is [`FlowId`]'s inner field `id`
+  map<uint32, uint64> flow_stat_size = 1;
+}
+
 message HeartbeatResponse {
   ResponseHeader header = 1;
   MailboxMessage mailbox_message = 2;