diff --git a/tdutils/td/utils/Time.h b/tdutils/td/utils/Time.h
index ece822d4..c7795ae4 100644
--- a/tdutils/td/utils/Time.h
+++ b/tdutils/td/utils/Time.h
@@ -128,6 +128,10 @@ inline Timestamp &operator+=(Timestamp &a, double b) {
   return a;
 }
 
+inline double operator-(const Timestamp &a, const Timestamp &b) {
+  return a.at() - b.at();
+}
+
 template <class StorerT>
 void store(const Timestamp &timestamp, StorerT &storer) {
   storer.store_binary(timestamp.at() - Time::now() + Clocks::system());
diff --git a/validator-engine/validator-engine.cpp b/validator-engine/validator-engine.cpp
index cc7c57b3..81b8278f 100644
--- a/validator-engine/validator-engine.cpp
+++ b/validator-engine/validator-engine.cpp
@@ -1957,7 +1957,8 @@ void ValidatorEngine::started_overlays() {
 
 void ValidatorEngine::start_validator() {
   validator_options_.write().set_allow_blockchain_init(config_.validators.size() > 0);
-  validator_options_.write().set_state_serializer_enabled(config_.state_serializer_enabled);
+  validator_options_.write().set_state_serializer_enabled(config_.state_serializer_enabled &&
+                                                          !state_serializer_disabled_flag_);
   load_collator_options();
 
   validator_manager_ = ton::validator::ValidatorManagerFactory::create(
@@ -3973,7 +3974,7 @@ void ValidatorEngine::run_control_query(ton::ton_api::engine_validator_setStateS
     promise.set_value(ton::create_serialize_tl_object<ton::ton_api::engine_validator_success>());
     return;
   }
-  validator_options_.write().set_state_serializer_enabled(query.enabled_);
+  validator_options_.write().set_state_serializer_enabled(query.enabled_ && !state_serializer_disabled_flag_);
   td::actor::send_closure(validator_manager_, &ton::validator::ValidatorManagerInterface::update_options,
                           validator_options_);
   config_.state_serializer_enabled = query.enabled_;
@@ -4556,6 +4557,11 @@ int main(int argc, char *argv[]) {
               td::actor::send_closure(x, &ValidatorEngine::set_validator_telemetry_filename, s);
             });
       });
+  p.add_option(
+      '\0', "disable-state-serializer",
+      "disable persistent state serializer (similar to set-state-serializer-enabled 0 in validator console)", [&]() {
+        acts.push_back([&x]() { td::actor::send_closure(x, &ValidatorEngine::set_state_serializer_disabled_flag); });
+      });
   auto S = p.run(argc, argv);
   if (S.is_error()) {
     LOG(ERROR) << "failed to parse options: " << S.move_as_error();
diff --git a/validator-engine/validator-engine.hpp b/validator-engine/validator-engine.hpp
index b7abb0b1..6c2f5c4b 100644
--- a/validator-engine/validator-engine.hpp
+++ b/validator-engine/validator-engine.hpp
@@ -228,6 +228,7 @@ class ValidatorEngine : public td::actor::Actor {
   std::string validator_telemetry_filename_;
   bool not_all_shards_ = false;
   std::vector<ton::ShardIdFull> add_shard_cmds_;
+  bool state_serializer_disabled_flag_ = false;
 
   std::set<ton::CatchainSeqno> unsafe_catchains_;
   std::map<ton::BlockSeqno, std::pair<ton::CatchainSeqno, td::uint32>> unsafe_catchain_rotations_;
@@ -325,6 +326,9 @@ class ValidatorEngine : public td::actor::Actor {
   void add_shard_cmd(ton::ShardIdFull shard) {
     add_shard_cmds_.push_back(shard);
   }
+  void set_state_serializer_disabled_flag() {
+    state_serializer_disabled_flag_ = true;
+  }
 
   void start_up() override;
   ValidatorEngine() {
diff --git a/validator/db/archive-manager.cpp b/validator/db/archive-manager.cpp
index d349f9d8..8c7cde17 100644
--- a/validator/db/archive-manager.cpp
+++ b/validator/db/archive-manager.cpp
@@ -1196,6 +1196,30 @@ void ArchiveManager::set_async_mode(bool mode, td::Promise<td::Unit> promise) {
   }
 }
 
+void ArchiveManager::prepare_stats(td::Promise<std::vector<std::pair<std::string, std::string>>> promise) {
+  std::vector<std::pair<std::string, std::string>> stats;
+  {
+    std::map<BlockSeqno, td::uint64> states;
+    for (auto &[key, file] : perm_states_) {
+      BlockSeqno seqno = key.first;
+      auto r_stat = td::stat(db_root_ + "/archive/states/" + file.filename_short());
+      if (r_stat.is_error()) {
+        LOG(WARNING) << "Cannot stat persistent state file " << file.filename_short() << " : " << r_stat.move_as_error();
+      } else {
+        states[seqno] += r_stat.move_as_ok().size_;
+      }
+    }
+    td::StringBuilder sb;
+    for (auto &[seqno, size] : states) {
+      sb << seqno << ":" << td::format::as_size(size) << " ";
+    }
+    if (!sb.as_cslice().empty()) {
+      stats.emplace_back("persistent_states", sb.as_cslice().str());
+    }
+  }
+  promise.set_value(std::move(stats));
+}
+
 void ArchiveManager::truncate(BlockSeqno masterchain_seqno, ConstBlockHandle handle, td::Promise<td::Unit> promise) {
   index_->begin_transaction().ensure();
   td::MultiPromise mp;
diff --git a/validator/db/archive-manager.hpp b/validator/db/archive-manager.hpp
index 90fc6a0b..d919e32e 100644
--- a/validator/db/archive-manager.hpp
+++ b/validator/db/archive-manager.hpp
@@ -81,6 +81,8 @@ class ArchiveManager : public td::actor::Actor {
     cur_shard_split_depth_ = value;
   }
 
+  void prepare_stats(td::Promise<std::vector<std::pair<std::string, std::string>>> promise);
+
   static constexpr td::uint32 archive_size() {
     return 20000;
   }
diff --git a/validator/db/celldb.cpp b/validator/db/celldb.cpp
index 9dcecdb3..e86a373d 100644
--- a/validator/db/celldb.cpp
+++ b/validator/db/celldb.cpp
@@ -158,6 +158,17 @@ void CellDbIn::start_up() {
         },
         td::Timestamp::now());
   }
+
+  {
+    std::string key = "stats.last_deleted_mc_seqno", value;
+    auto R = cell_db_->get(td::as_slice(key), value);
+    R.ensure();
+    if (R.ok() == td::KeyValue::GetStatus::Ok) {
+      auto r_value = td::to_integer_safe<BlockSeqno>(value);
+      r_value.ensure();
+      last_deleted_mc_state_ = r_value.move_as_ok();
+    }
+  }
 }
 
 void CellDbIn::load_cell(RootHash hash, td::Promise<td::Ref<vm::DataCell>> promise) {
@@ -452,6 +463,11 @@ void CellDbIn::gc_cont2(BlockHandle handle) {
           cell_db_->erase(get_key(key_hash)).ensure();
           set_block(F.prev, std::move(P));
           set_block(F.next, std::move(N));
+          if (handle->id().is_masterchain()) {
+            last_deleted_mc_state_ = handle->id().seqno();
+            std::string key = "stats.last_deleted_mc_seqno", value = td::to_string(last_deleted_mc_state_);
+            cell_db_->set(td::as_slice(key), td::as_slice(value));
+          }
           cell_db_->commit_write_batch().ensure();
           alarm_timestamp() = td::Timestamp::now();
           timer_write_batch.reset();
@@ -475,9 +491,6 @@ void CellDbIn::gc_cont2(BlockHandle handle) {
           if (!opts_->get_disable_rocksdb_stats()) {
             cell_db_statistics_.gc_cell_time_.insert(timer.elapsed() * 1e6);
           }
-          if (handle->id().is_masterchain()) {
-            last_deleted_mc_state_ = handle->id().seqno();
-          }
           LOG(DEBUG) << "Deleted state " << handle->id().to_str();
           timer_finish.reset();
           timer_all.reset();
diff --git a/validator/db/rootdb.cpp b/validator/db/rootdb.cpp
index e0579d57..8d83e7a7 100644
--- a/validator/db/rootdb.cpp
+++ b/validator/db/rootdb.cpp
@@ -438,6 +438,7 @@ void RootDb::allow_block_gc(BlockIdExt block_id, td::Promise<bool> promise) {
 void RootDb::prepare_stats(td::Promise<std::vector<std::pair<std::string, std::string>>> promise) {
   auto merger = StatsMerger::create(std::move(promise));
   td::actor::send_closure(cell_db_, &CellDb::prepare_stats, merger.make_promise("celldb."));
+  td::actor::send_closure(archive_db_, &ArchiveManager::prepare_stats, merger.make_promise("archive."));
 }
 
 void RootDb::truncate(BlockSeqno seqno, ConstBlockHandle handle, td::Promise<td::Unit> promise) {
diff --git a/validator/downloaders/download-state.cpp b/validator/downloaders/download-state.cpp
index 32978ea5..8473cb22 100644
--- a/validator/downloaders/download-state.cpp
+++ b/validator/downloaders/download-state.cpp
@@ -38,6 +38,7 @@ DownloadShardState::DownloadShardState(BlockIdExt block_id, BlockIdExt mastercha
 }
 
 void DownloadShardState::start_up() {
+  status_ = ProcessStatus(manager_, "process.download_state");
   alarm_timestamp() = timeout_;
 
   auto P = td::PromiseCreator::lambda([SelfId = actor_id(this)](td::Result<BlockHandle> R) {
@@ -81,6 +82,7 @@ void DownloadShardState::download_state() {
   });
   td::actor::send_closure(manager_, &ValidatorManager::send_get_block_proof_link_request, block_id_, priority_,
                           std::move(P));
+  status_.set_status(PSTRING() << block_id_.id.to_str() << " : downloading proof");
 }
 
 void DownloadShardState::downloaded_proof_link(td::BufferSlice data) {
@@ -123,6 +125,7 @@ void DownloadShardState::checked_proof_link() {
     td::actor::send_closure(manager_, &ValidatorManager::send_get_persistent_state_request, block_id_,
                             masterchain_block_id_, priority_, std::move(P));
   }
+  status_.set_status(PSTRING() << block_id_.id.to_str() << " : downloading state");
 }
 
 void DownloadShardState::download_zero_state() {
@@ -152,6 +155,7 @@ void DownloadShardState::downloaded_zero_state(td::BufferSlice data) {
 }
 
 void DownloadShardState::downloaded_shard_state(td::BufferSlice data) {
+  status_.set_status(PSTRING() << block_id_.id.to_str() << " : processing downloaded state");
   auto S = create_shard_state(block_id_, data.clone());
   if (S.is_error()) {
     fail_handler(actor_id(this), S.move_as_error());
@@ -174,6 +178,7 @@ void DownloadShardState::downloaded_shard_state(td::BufferSlice data) {
 }
 
 void DownloadShardState::checked_shard_state() {
+  status_.set_status(PSTRING() << block_id_.id.to_str() << " : storing state file");
   LOG(WARNING) << "checked shard state " << block_id_.to_str();
   auto P = td::PromiseCreator::lambda([SelfId = actor_id(this)](td::Result<td::Unit> R) {
     R.ensure();
@@ -189,6 +194,7 @@ void DownloadShardState::checked_shard_state() {
 }
 
 void DownloadShardState::written_shard_state_file() {
+  status_.set_status(PSTRING() << block_id_.id.to_str() << " : storing state to celldb");
   LOG(WARNING) << "written shard state file " << block_id_.to_str();
   auto P = td::PromiseCreator::lambda([SelfId = actor_id(this)](td::Result<td::Ref<ShardState>> R) {
     R.ensure();
@@ -198,6 +204,7 @@ void DownloadShardState::written_shard_state_file() {
 }
 
 void DownloadShardState::written_shard_state(td::Ref<ShardState> state) {
+  status_.set_status(PSTRING() << block_id_.id.to_str() << " : finishing");
   state_ = std::move(state);
   handle_->set_unix_time(state_->get_unix_time());
   handle_->set_is_key_block(block_id_.is_masterchain());
diff --git a/validator/downloaders/download-state.hpp b/validator/downloaders/download-state.hpp
index 02984c53..bde80aae 100644
--- a/validator/downloaders/download-state.hpp
+++ b/validator/downloaders/download-state.hpp
@@ -19,6 +19,7 @@
 #pragma once
 
 #include "validator/interfaces/validator-manager.h"
+#include "stats-provider.h"
 
 namespace ton {
 
@@ -67,6 +68,8 @@ class DownloadShardState : public td::actor::Actor {
 
   td::BufferSlice data_;
   td::Ref<ShardState> state_;
+
+  ProcessStatus status_;
 };
 
 }  // namespace validator
diff --git a/validator/impl/collator-impl.h b/validator/impl/collator-impl.h
index a781968d..ce21bc5e 100644
--- a/validator/impl/collator-impl.h
+++ b/validator/impl/collator-impl.h
@@ -50,7 +50,7 @@ class Collator final : public td::actor::Actor {
   using LtCellRef = block::LtCellRef;
   using NewOutMsg = block::NewOutMsg;
   const ShardIdFull shard_;
-  ton::BlockId new_id;
+  ton::BlockId new_id{workchainInvalid, 0, 0};
   bool busy_{false};
   bool before_split_{false};
   bool after_split_{false};
diff --git a/validator/impl/collator.cpp b/validator/impl/collator.cpp
index d3378cd8..d5c41853 100644
--- a/validator/impl/collator.cpp
+++ b/validator/impl/collator.cpp
@@ -352,6 +352,8 @@ bool Collator::fatal_error(td::Status error) {
                         attempt_idx_ + 1);
     } else {
       main_promise(std::move(error));
+      td::actor::send_closure(manager, &ValidatorManager::record_collate_query_stats, BlockIdExt{new_id, RootHash::zero(), FileHash::zero()},
+                              work_timer_.elapsed(), cpu_work_timer_.elapsed(), td::optional<CollationStats>{});
     }
     busy_ = false;
   }
diff --git a/validator/impl/liteserver.cpp b/validator/impl/liteserver.cpp
index 723dbfe9..83f39c45 100644
--- a/validator/impl/liteserver.cpp
+++ b/validator/impl/liteserver.cpp
@@ -85,19 +85,13 @@ void LiteQuery::abort_query(td::Status reason) {
   if (acc_state_promise_) {
     acc_state_promise_.set_error(std::move(reason));
   } else if (promise_) {
+    td::actor::send_closure(manager_, &ValidatorManager::add_lite_query_stats, query_obj_ ? query_obj_->get_id() : 0,
+                            false);
     promise_.set_error(std::move(reason));
   }
   stop();
 }
 
-void LiteQuery::abort_query_ext(td::Status reason, std::string comment) {
-  LOG(INFO) << "aborted liteserver query: " << comment << " : " << reason.to_string();
-  if (promise_) {
-    promise_.set_error(reason.move_as_error_prefix(comment + " : "));
-  }
-  stop();
-}
-
 bool LiteQuery::fatal_error(td::Status error) {
   abort_query(std::move(error));
   return false;
@@ -120,6 +114,8 @@ bool LiteQuery::finish_query(td::BufferSlice result, bool skip_cache_update) {
     td::actor::send_closure(cache_, &LiteServerCache::update, cache_key_, result.clone());
   }
   if (promise_) {
+    td::actor::send_closure(manager_, &ValidatorManager::add_lite_query_stats, query_obj_ ? query_obj_->get_id() : 0,
+                            true);
     promise_.set_result(std::move(result));
     stop();
     return true;
@@ -139,7 +135,6 @@ void LiteQuery::start_up() {
 
   auto F = fetch_tl_object<ton::lite_api::Function>(query_, true);
   if (F.is_error()) {
-    td::actor::send_closure(manager_, &ValidatorManager::add_lite_query_stats, 0);  // unknown
     abort_query(F.move_as_error());
     return;
   }
@@ -192,7 +187,6 @@ bool LiteQuery::use_cache()  {
 }
 
 void LiteQuery::perform() {
-  td::actor::send_closure(manager_, &ValidatorManager::add_lite_query_stats, query_obj_->get_id());
   lite_api::downcast_call(
       *query_obj_,
       td::overloaded(
diff --git a/validator/impl/liteserver.hpp b/validator/impl/liteserver.hpp
index 447e1dad..fc873533 100644
--- a/validator/impl/liteserver.hpp
+++ b/validator/impl/liteserver.hpp
@@ -97,7 +97,6 @@ class LiteQuery : public td::actor::Actor {
   bool fatal_error(std::string err_msg, int err_code = -400);
   bool fatal_error(int err_code, std::string err_msg = "");
   void abort_query(td::Status reason);
-  void abort_query_ext(td::Status reason, std::string err_msg);
   bool finish_query(td::BufferSlice result, bool skip_cache_update = false);
   void alarm() override;
   void start_up() override;
diff --git a/validator/impl/validate-query.cpp b/validator/impl/validate-query.cpp
index 583b1d86..31c30e90 100644
--- a/validator/impl/validate-query.cpp
+++ b/validator/impl/validate-query.cpp
@@ -115,7 +115,7 @@ bool ValidateQuery::reject_query(std::string error, td::BufferSlice reason) {
   error = error_ctx() + error;
   LOG(ERROR) << "REJECT: aborting validation of block candidate for " << shard_.to_str() << " : " << error;
   if (main_promise) {
-    record_stats();
+    record_stats(false);
     errorlog::ErrorLog::log(PSTRING() << "REJECT: aborting validation of block candidate for " << shard_.to_str()
                                       << " : " << error << ": data=" << block_candidate.id.file_hash.to_hex()
                                       << " collated_data=" << block_candidate.collated_file_hash.to_hex());
@@ -153,7 +153,7 @@ bool ValidateQuery::soft_reject_query(std::string error, td::BufferSlice reason)
   error = error_ctx() + error;
   LOG(ERROR) << "SOFT REJECT: aborting validation of block candidate for " << shard_.to_str() << " : " << error;
   if (main_promise) {
-    record_stats();
+    record_stats(false);
     errorlog::ErrorLog::log(PSTRING() << "SOFT REJECT: aborting validation of block candidate for " << shard_.to_str()
                                       << " : " << error << ": data=" << block_candidate.id.file_hash.to_hex()
                                       << " collated_data=" << block_candidate.collated_file_hash.to_hex());
@@ -176,7 +176,7 @@ bool ValidateQuery::fatal_error(td::Status error) {
   error.ensure_error();
   LOG(ERROR) << "aborting validation of block candidate for " << shard_.to_str() << " : " << error.to_string();
   if (main_promise) {
-    record_stats();
+    record_stats(false);
     auto c = error.code();
     if (c <= -667 && c >= -670) {
       errorlog::ErrorLog::log(PSTRING() << "FATAL ERROR: aborting validation of block candidate for " << shard_.to_str()
@@ -234,7 +234,7 @@ bool ValidateQuery::fatal_error(std::string err_msg, int err_code) {
  */
 void ValidateQuery::finish_query() {
   if (main_promise) {
-    record_stats();
+    record_stats(true);
     LOG(WARNING) << "validate query done";
     main_promise.set_result(now_);
   }
@@ -6928,13 +6928,13 @@ void ValidateQuery::written_candidate() {
 /**
  * Sends validation work time to manager.
  */
-void ValidateQuery::record_stats() {
+void ValidateQuery::record_stats(bool success) {
   double work_time = work_timer_.elapsed();
   double cpu_work_time = cpu_work_timer_.elapsed();
   LOG(WARNING) << "validation took " << perf_timer_.elapsed() << "s";
   LOG(WARNING) << "Validate query work time = " << work_time << "s, cpu time = " << cpu_work_time << "s";
   td::actor::send_closure(manager, &ValidatorManager::record_validate_query_stats, block_candidate.id, work_time,
-                          cpu_work_time);
+                          cpu_work_time, success);
 }
 
 }  // namespace validator
diff --git a/validator/impl/validate-query.hpp b/validator/impl/validate-query.hpp
index 98cd2493..90c368ff 100644
--- a/validator/impl/validate-query.hpp
+++ b/validator/impl/validate-query.hpp
@@ -400,7 +400,7 @@ class ValidateQuery : public td::actor::Actor {
 
   td::Timer work_timer_{true};
   td::ThreadCpuTimer cpu_work_timer_{true};
-  void record_stats();
+  void record_stats(bool success);
 };
 
 }  // namespace validator
diff --git a/validator/interfaces/validator-manager.h b/validator/interfaces/validator-manager.h
index 20d4bd62..00fb77e1 100644
--- a/validator/interfaces/validator-manager.h
+++ b/validator/interfaces/validator-manager.h
@@ -205,13 +205,13 @@ class ValidatorManager : public ValidatorManagerInterface {
       td::optional<ShardIdFull> shard,
       td::Promise<tl_object_ptr<lite_api::liteServer_nonfinal_validatorGroups>> promise) = 0;
 
-  virtual void add_lite_query_stats(int lite_query_id) {
+  virtual void add_lite_query_stats(int lite_query_id, bool success) {
   }
 
   virtual void record_collate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time,
-                                          CollationStats stats) {
+                                          td::optional<CollationStats> stats) {
   }
-  virtual void record_validate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time) {
+  virtual void record_validate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time, bool success) {
   }
 
   virtual void add_persistent_state_description(td::Ref<PersistentStateDescription> desc) = 0;
diff --git a/validator/manager-init.cpp b/validator/manager-init.cpp
index c2944b25..6f304680 100644
--- a/validator/manager-init.cpp
+++ b/validator/manager-init.cpp
@@ -32,6 +32,8 @@ namespace ton {
 namespace validator {
 
 void ValidatorManagerMasterchainReiniter::start_up() {
+  status_ = ProcessStatus(manager_, "process.initial_sync");
+  status_.set_status(PSTRING() << "starting, init block seqno " << block_id_.seqno());
   LOG(INFO) << "init_block_id=" << block_id_;
   CHECK(block_id_.is_masterchain());
   CHECK(block_id_.id.shard == shardIdAll);
@@ -58,6 +60,7 @@ void ValidatorManagerMasterchainReiniter::got_masterchain_handle(BlockHandle han
   key_blocks_.push_back(handle_);
 
   if (opts_->initial_sync_disabled()) {
+    status_.set_status(PSTRING() << "downloading masterchain state " << handle_->id().seqno());
     auto P = td::PromiseCreator::lambda([SelfId = actor_id(this)](td::Result<td::Ref<ShardState>> R) {
       R.ensure();
       td::actor::send_closure(SelfId, &ValidatorManagerMasterchainReiniter::download_masterchain_state);
@@ -181,6 +184,7 @@ void ValidatorManagerMasterchainReiniter::got_next_key_blocks(std::vector<BlockI
     }
   }
   LOG(WARNING) << "last key block is " << vec[vec.size() - 1];
+  status_.set_status(PSTRING() << "last key block is " << vec.back().seqno());
   auto s = static_cast<td::uint32>(key_blocks_.size());
   key_blocks_.resize(key_blocks_.size() + vec.size(), nullptr);
 
@@ -247,6 +251,7 @@ void ValidatorManagerMasterchainReiniter::choose_masterchain_state() {
 }
 
 void ValidatorManagerMasterchainReiniter::download_masterchain_state() {
+  status_.set_status(PSTRING() << "downloading masterchain state " << block_id_.seqno());
   auto P = td::PromiseCreator::lambda([SelfId = actor_id(this)](td::Result<td::Ref<ShardState>> R) {
     if (R.is_error()) {
       LOG(WARNING) << "failed to download masterchain state: " << R.move_as_error();
@@ -274,6 +279,7 @@ void ValidatorManagerMasterchainReiniter::downloaded_masterchain_state(td::Ref<S
     td::actor::send_closure(SelfId, &ValidatorManagerMasterchainReiniter::downloaded_all_shards);
   });
   client_ = td::actor::create_actor<ShardClient>("shardclient", opts_, handle_, state_, manager_, std::move(P));
+  status_.set_status(PSTRING() << "downloading all shard states, mc seqno " << block_id_.seqno());
 }
 
 void ValidatorManagerMasterchainReiniter::downloaded_all_shards() {
diff --git a/validator/manager-init.hpp b/validator/manager-init.hpp
index 7dce4e47..901b826b 100644
--- a/validator/manager-init.hpp
+++ b/validator/manager-init.hpp
@@ -27,6 +27,8 @@
 
 #include "manager-init.h"
 
+#include <stats-provider.h>
+
 namespace ton {
 
 namespace validator {
@@ -77,6 +79,8 @@ class ValidatorManagerMasterchainReiniter : public td::actor::Actor {
 
   td::uint32 pending_ = 0;
   td::actor::ActorOwn<ShardClient> client_;
+
+  ProcessStatus status_;
 };
 
 class ValidatorManagerMasterchainStarter : public td::actor::Actor {
diff --git a/validator/manager.cpp b/validator/manager.cpp
index 068ea5eb..8dce764d 100644
--- a/validator/manager.cpp
+++ b/validator/manager.cpp
@@ -451,11 +451,9 @@ void ValidatorManagerImpl::check_external_message(td::BufferSlice data, td::Prom
 
   promise = [self = this, wc, addr, promise = std::move(promise),
              SelfId = actor_id(this)](td::Result<td::Ref<ExtMessage>> R) mutable {
-    if (R.is_error()) {
-      promise.set_error(R.move_as_error());
-      return;
-    }
-    td::actor::send_lambda(SelfId, [=, promise = std::move(promise), message = R.move_as_ok()]() mutable {
+    td::actor::send_lambda(SelfId, [=, promise = std::move(promise), R = std::move(R)]() mutable {
+      ++(R.is_ok() ? self->total_check_ext_messages_ok_ : self->total_check_ext_messages_error_);
+      TRY_RESULT_PROMISE(promise, message, std::move(R));
       if (self->checked_ext_msg_counter_.inc_msg_count(wc, addr) > max_ext_msg_per_addr()) {
         promise.set_error(
             td::Status::Error(PSTRING() << "too many external messages to address " << wc << ":" << addr.to_hex()));
@@ -2131,7 +2129,7 @@ void ValidatorManagerImpl::update_shards() {
     }
   }
 
-  bool validating_masterchain = false;
+  active_validator_groups_master_ = active_validator_groups_shard_ = 0;
   if (allow_validate_) {
     for (auto &desc : new_shards) {
       auto shard = desc.first;
@@ -2148,9 +2146,7 @@ void ValidatorManagerImpl::update_shards() {
       auto validator_id = get_validator(shard, val_set);
 
       if (!validator_id.is_zero()) {
-        if (shard.is_masterchain()) {
-          validating_masterchain = true;
-        }
+        ++(shard.is_masterchain() ? active_validator_groups_master_ : active_validator_groups_shard_);
         auto val_group_id = get_validator_set_id(shard, val_set, opts_hash, key_seqno, opts);
 
         if (force_recover) {
@@ -2845,8 +2841,8 @@ void ValidatorManagerImpl::prepare_stats(td::Promise<std::vector<std::pair<std::
     vec.emplace_back("knownkeymasterchainblock", last_known_key_block_handle_->id().to_str());
     vec.emplace_back("rotatemasterchainblock", last_rotate_block_id_.to_str());
     //vec.emplace_back("shardclientmasterchainseqno", td::to_string(min_confirmed_masterchain_seqno_));
-    vec.emplace_back("stateserializermasterchainseqno", td::to_string(state_serializer_masterchain_seqno_));
   }
+
   td::NamedThreadSafeCounter::get_default().for_each([&](auto key, auto value) {
     vec.emplace_back("counter." + key, PSTRING() << value);
   });
@@ -2864,9 +2860,48 @@ void ValidatorManagerImpl::prepare_stats(td::Promise<std::vector<std::pair<std::
     td::actor::send_closure(shard_client_, &ShardClient::get_processed_masterchain_block, std::move(P));
   }
 
+  vec.emplace_back("start_time", td::to_string(started_at_));
+  for (int iter = 0; iter < 2; ++iter) {
+    td::StringBuilder sb;
+    td::uint32 total = 0;
+    for (const auto &p : (iter ? total_ls_queries_error_ : total_ls_queries_ok_)) {
+      sb << lite_query_name_by_id(p.first) << ":" << p.second << " ";
+      total += p.second;
+    }
+    sb << "TOTAL:" << total;
+    vec.emplace_back(PSTRING() << "total.ls_queries_" << (iter ? "error" : "ok"), sb.as_cslice().str());
+  }
+  vec.emplace_back("total.ext_msg_check",
+                   PSTRING() << "ok:" << total_check_ext_messages_ok_ << " error:" << total_check_ext_messages_error_);
+  vec.emplace_back("total.collated_blocks.master", PSTRING() << "ok:" << total_collated_blocks_master_ok_
+                                                             << " error:" << total_collated_blocks_master_error_);
+  vec.emplace_back("total.collated_blocks.shard", PSTRING() << "ok:" << total_collated_blocks_shard_ok_
+                                                            << " error:" << total_collated_blocks_shard_error_);
+  vec.emplace_back("total.validated_blocks.master", PSTRING() << "ok:" << total_validated_blocks_master_ok_
+                                                              << " error:" << total_validated_blocks_master_error_);
+  vec.emplace_back("total.validated_blocks.shard", PSTRING() << "ok:" << total_validated_blocks_shard_ok_
+                                                             << " error:" << total_validated_blocks_shard_error_);
+  if (is_validator()) {
+    vec.emplace_back("active_validator_groups", PSTRING() << "master:" << active_validator_groups_master_
+                                                          << " shard:" << active_validator_groups_shard_);
+  }
+
+  bool serializer_enabled = opts_->get_state_serializer_enabled();
+  if (is_validator() && last_masterchain_state_->get_global_id() == -239) {
+    serializer_enabled = false;
+  }
+  vec.emplace_back("stateserializerenabled", serializer_enabled ? "true" : "false");
+
   merger.make_promise("").set_value(std::move(vec));
 
+  if (!serializer_.empty()) {
+    td::actor::send_closure(serializer_, &AsyncStateSerializer::prepare_stats, merger.make_promise(""));
+  }
+
   td::actor::send_closure(db_, &Db::prepare_stats, merger.make_promise("db."));
+  for (auto &[_, p] : stats_providers_) {
+    p.second(merger.make_promise(p.first));
+  }
 }
 
 void ValidatorManagerImpl::prepare_perf_timer_stats(td::Promise<std::vector<PerfTimerStats>> promise) {
@@ -3353,17 +3388,28 @@ td::actor::ActorOwn<ValidatorManagerInterface> ValidatorManagerFactory::create(
 }
 
 void ValidatorManagerImpl::record_collate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time,
-                                                      CollationStats stats) {
+                                                      td::optional<CollationStats> stats) {
+  if (!stats) {
+    ++(block_id.is_masterchain() ? total_collated_blocks_master_error_ : total_collated_blocks_shard_error_);
+    return;
+  }
   auto &record = new_block_stats_record(block_id);
   record.collator_work_time_ = work_time;
   record.collator_cpu_work_time_ = cpu_work_time;
-  record.collator_stats_ = std::move(stats);
+  record.collator_stats_ = std::move(stats.value());
+  ++(block_id.is_masterchain() ? total_collated_blocks_master_ok_ : total_collated_blocks_shard_ok_);
 }
 
-void ValidatorManagerImpl::record_validate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time) {
+void ValidatorManagerImpl::record_validate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time,
+                                                       bool success) {
   auto &record = new_block_stats_record(block_id);
   record.validator_work_time_ = work_time;
   record.validator_cpu_work_time_ = cpu_work_time;
+  if (success) {
+    ++(block_id.is_masterchain() ? total_validated_blocks_master_ok_ : total_validated_blocks_shard_ok_);
+  } else {
+    ++(block_id.is_masterchain() ? total_validated_blocks_master_error_ : total_validated_blocks_shard_error_);
+  }
 }
 
 ValidatorManagerImpl::RecordedBlockStats &ValidatorManagerImpl::new_block_stats_record(BlockIdExt block_id) {
@@ -3377,6 +3423,16 @@ ValidatorManagerImpl::RecordedBlockStats &ValidatorManagerImpl::new_block_stats_
   return recorded_block_stats_[block_id];
 }
 
+void ValidatorManagerImpl::register_stats_provider(
+    td::uint64 idx, std::string prefix,
+    std::function<void(td::Promise<std::vector<std::pair<std::string, std::string>>>)> callback) {
+  stats_providers_[idx] = {std::move(prefix), std::move(callback)};
+}
+
+void ValidatorManagerImpl::unregister_stats_provider(td::uint64 idx) {
+  stats_providers_.erase(idx);
+}
+
 size_t ValidatorManagerImpl::CheckedExtMsgCounter::get_msg_count(WorkchainId wc, StdSmcAddress addr) {
   before_query();
   auto it1 = counter_cur_.find({wc, addr});
diff --git a/validator/manager.hpp b/validator/manager.hpp
index 519cab12..9e54c3f3 100644
--- a/validator/manager.hpp
+++ b/validator/manager.hpp
@@ -655,8 +655,9 @@ class ValidatorManagerImpl : public ValidatorManager {
       td::optional<ShardIdFull> shard,
       td::Promise<tl_object_ptr<lite_api::liteServer_nonfinal_validatorGroups>> promise) override;
 
-  void add_lite_query_stats(int lite_query_id) override {
+  void add_lite_query_stats(int lite_query_id, bool success) override {
     ++ls_stats_[lite_query_id];
+    ++(success ? total_ls_queries_ok_ : total_ls_queries_error_)[lite_query_id];
   }
 
  private:
@@ -747,6 +748,16 @@ class ValidatorManagerImpl : public ValidatorManager {
   std::map<int, td::uint32> ls_stats_;  // lite_api ID -> count, 0 for unknown
   td::uint32 ls_stats_check_ext_messages_{0};
 
+  UnixTime started_at_ = (UnixTime)td::Clocks::system();
+  std::map<int, td::uint64> total_ls_queries_ok_, total_ls_queries_error_;  // lite_api ID -> count, 0 for unknown
+  td::uint64 total_check_ext_messages_ok_{0}, total_check_ext_messages_error_{0};
+  td::uint64 total_collated_blocks_master_ok_{0}, total_collated_blocks_master_error_{0};
+  td::uint64 total_validated_blocks_master_ok_{0}, total_validated_blocks_master_error_{0};
+  td::uint64 total_collated_blocks_shard_ok_{0}, total_collated_blocks_shard_error_{0};
+  td::uint64 total_validated_blocks_shard_ok_{0}, total_validated_blocks_shard_error_{0};
+
+  size_t active_validator_groups_master_{0}, active_validator_groups_shard_{0};
+
   td::actor::ActorOwn<CandidatesBuffer> candidates_buffer_;
 
   struct RecordedBlockStats {
@@ -760,16 +771,25 @@ class ValidatorManagerImpl : public ValidatorManager {
   std::queue<BlockIdExt> recorded_block_stats_lru_;
 
   void record_collate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time,
-                                  CollationStats stats) override;
-  void record_validate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time) override;
+                                  td::optional<CollationStats> stats) override;
+  void record_validate_query_stats(BlockIdExt block_id, double work_time, double cpu_work_time, bool success) override;
   RecordedBlockStats &new_block_stats_record(BlockIdExt block_id);
 
+  void register_stats_provider(
+      td::uint64 idx, std::string prefix,
+      std::function<void(td::Promise<std::vector<std::pair<std::string, std::string>>>)> callback) override;
+  void unregister_stats_provider(td::uint64 idx) override;
+
   std::map<PublicKeyHash, td::actor::ActorOwn<ValidatorTelemetry>> validator_telemetry_;
 
   void init_validator_telemetry();
 
   std::map<BlockSeqno, td::Ref<PersistentStateDescription>> persistent_state_descriptions_;
   std::map<BlockIdExt, td::Ref<PersistentStateDescription>> persistent_state_blocks_;
+
+  std::map<td::uint64,
+           std::pair<std::string, std::function<void(td::Promise<std::vector<std::pair<std::string, std::string>>>)>>>
+      stats_providers_;
 };
 
 }  // namespace validator
diff --git a/validator/net/download-state.cpp b/validator/net/download-state.cpp
index 2b373ef3..6735a2b5 100644
--- a/validator/net/download-state.cpp
+++ b/validator/net/download-state.cpp
@@ -70,6 +70,7 @@ void DownloadState::finish_query() {
 }
 
 void DownloadState::start_up() {
+  status_ = ProcessStatus(validator_manager_, "process.download_state_net");
   alarm_timestamp() = timeout_;
 
   td::actor::send_closure(validator_manager_, &ValidatorManagerInterface::get_persistent_state, block_id_,
@@ -190,6 +191,7 @@ void DownloadState::got_block_state_description(td::BufferSlice data) {
                                       td::Timestamp::in(3.0), std::move(P));
             }
           }));
+  status_.set_status(PSTRING() << block_id_.id.to_str() << " : 0 bytes, 0B/s");
 }
 
 void DownloadState::got_block_state_part(td::BufferSlice data, td::uint32 requested_size) {
@@ -198,14 +200,18 @@ void DownloadState::got_block_state_part(td::BufferSlice data, td::uint32 reques
   parts_.push_back(std::move(data));
 
   double elapsed = prev_logged_timer_.elapsed();
-  if (elapsed > 10.0) {
+  if (elapsed > 5.0) {
     prev_logged_timer_ = td::Timer();
+    auto speed = (td::uint64)((double)(sum_ - prev_logged_sum_) / elapsed);
     LOG(WARNING) << "downloading state " << block_id_.to_str() << ": " << td::format::as_size(sum_) << " ("
-                 << td::format::as_size((td::uint64)(double(sum_ - prev_logged_sum_) / elapsed)) << "/s)";
+                 << td::format::as_size(speed) << "/s)";
+    status_.set_status(PSTRING() << block_id_.id.to_str() << " : " << sum_ << " bytes, " << td::format::as_size(speed)
+                                 << "/s");
     prev_logged_sum_ = sum_;
   }
 
   if (last_part) {
+    status_.set_status(PSTRING() << block_id_.id.to_str() << " : " << sum_ << " bytes, finishing");
     td::BufferSlice res{td::narrow_cast<std::size_t>(sum_)};
     auto S = res.as_slice();
     for (auto &p : parts_) {
diff --git a/validator/net/download-state.hpp b/validator/net/download-state.hpp
index 19c44beb..470c5431 100644
--- a/validator/net/download-state.hpp
+++ b/validator/net/download-state.hpp
@@ -23,6 +23,8 @@
 #include "validator/validator.h"
 #include "adnl/adnl-ext-client.h"
 
+#include <stats-provider.h>
+
 namespace ton {
 
 namespace validator {
@@ -75,6 +77,8 @@ class DownloadState : public td::actor::Actor {
 
   td::uint64 prev_logged_sum_ = 0;
   td::Timer prev_logged_timer_;
+
+  ProcessStatus status_;
 };
 
 }  // namespace fullnode
diff --git a/validator/state-serializer.cpp b/validator/state-serializer.cpp
index b693232b..bc3d7b5e 100644
--- a/validator/state-serializer.cpp
+++ b/validator/state-serializer.cpp
@@ -58,6 +58,12 @@ void AsyncStateSerializer::got_self_state(AsyncSerializerState state) {
     });
     td::actor::send_closure(manager_, &ValidatorManager::get_block_handle, last_block_id_, true, std::move(P));
   }
+
+  inited_block_id_ = true;
+  for (auto& promise : wait_init_block_id_) {
+    promise.set_value(td::Unit());
+  }
+  wait_init_block_id_.clear();
 }
 
 void AsyncStateSerializer::got_init_handle(BlockHandle handle) {
@@ -186,6 +192,9 @@ void AsyncStateSerializer::next_iteration() {
               td::actor::send_closure(SelfId, &AsyncStateSerializer::request_previous_state_files);
             },
             td::Timestamp::in(delay));
+        current_status_ = PSTRING() << "delay before serializing seqno=" << masterchain_handle_->id().seqno() << " "
+                                    << (int)delay << "s";
+        current_status_ts_ = td::Timestamp::now();
         return;
       }
       if (next_idx_ < shards_.size()) {
@@ -379,9 +388,14 @@ void AsyncStateSerializer::got_masterchain_state(td::Ref<MasterchainState> state
 
   td::actor::send_closure(manager_, &ValidatorManager::store_persistent_state_file_gen, masterchain_handle_->id(),
                           masterchain_handle_->id(), write_data, std::move(P));
+
+  current_status_ = PSTRING() << "serializing masterchain state " << state->get_block_id().id.to_str();
+  current_status_ts_ = td::Timestamp::now();
 }
 
 void AsyncStateSerializer::stored_masterchain_state() {
+  current_status_ = "pending";
+  current_status_ts_ = {};
   LOG(ERROR) << "finished serializing masterchain state " << masterchain_handle_->id().id.to_str();
   running_ = false;
   next_iteration();
@@ -444,9 +458,14 @@ void AsyncStateSerializer::got_shard_state(BlockHandle handle, td::Ref<ShardStat
   });
   td::actor::send_closure(manager_, &ValidatorManager::store_persistent_state_file_gen, handle->id(),
                           masterchain_handle_->id(), write_data, std::move(P));
+  current_status_ = PSTRING() << "serializing shard state " << next_idx_ << "/" << shards_.size() << " "
+                              << state->get_block_id().id.to_str();
+  current_status_ts_ = td::Timestamp::now();
 }
 
 void AsyncStateSerializer::fail_handler(td::Status reason) {
+  current_status_ = PSTRING() << "pending, " << reason;
+  current_status_ts_ = {};
   VLOG(VALIDATOR_NOTICE) << "failure: " << reason;
   attempt_++;
   delay_action(
@@ -460,6 +479,8 @@ void AsyncStateSerializer::fail_handler_cont() {
 }
 
 void AsyncStateSerializer::success_handler() {
+  current_status_ = "pending";
+  current_status_ts_ = {};
   running_ = false;
   next_iteration();
 }
@@ -478,6 +499,29 @@ void AsyncStateSerializer::auto_disable_serializer(bool disabled) {
   }
 }
 
+void AsyncStateSerializer::prepare_stats(td::Promise<std::vector<std::pair<std::string, std::string>>> promise) {
+  if (!inited_block_id_) {
+    wait_init_block_id_.push_back(
+        [SelfId = actor_id(this), promise = std::move(promise)](td::Result<td::Unit> R) mutable {
+          TRY_STATUS_PROMISE(promise, R.move_as_status());
+          td::actor::send_closure(SelfId, &AsyncStateSerializer::prepare_stats, std::move(promise));
+        });
+    return;
+  }
+  std::vector<std::pair<std::string, std::string>> vec;
+  vec.emplace_back("stateserializermasterchainseqno", td::to_string(last_block_id_.seqno()));
+  td::StringBuilder sb;
+  sb << current_status_;
+  if (current_status_ts_) {
+    sb << " (started " << (int)(td::Timestamp::now() - current_status_ts_) << "s ago)";
+  }
+  if (!opts_->get_state_serializer_enabled() || auto_disabled_) {
+    sb << " (disabled)";
+  }
+  vec.emplace_back("stateserializerstatus", sb.as_cslice().str());
+  promise.set_result(std::move(vec));
+}
+
 bool AsyncStateSerializer::need_serialize(BlockHandle handle) {
   if (handle->id().id.seqno == 0 || !handle->is_key_block()) {
     return false;
diff --git a/validator/state-serializer.hpp b/validator/state-serializer.hpp
index 1e7f5c9c..406ac350 100644
--- a/validator/state-serializer.hpp
+++ b/validator/state-serializer.hpp
@@ -36,6 +36,9 @@ class AsyncStateSerializer : public td::actor::Actor {
   UnixTime last_key_block_ts_ = 0;
   bool saved_to_db_ = true;
 
+  bool inited_block_id_ = false;
+  std::vector<td::Promise<td::Unit>> wait_init_block_id_;
+
   td::Ref<ValidatorManagerOptions> opts_;
   bool auto_disabled_ = false;
   td::CancellationTokenSource cancellation_token_source_;
@@ -95,6 +98,8 @@ class AsyncStateSerializer : public td::actor::Actor {
     promise.set_result(last_block_id_.id.seqno);
   }
 
+  void prepare_stats(td::Promise<std::vector<std::pair<std::string, std::string>>> promise);
+
   void update_last_known_key_block_ts(UnixTime ts) {
     last_known_key_block_ts_ = std::max(last_known_key_block_ts_, ts);
   }
@@ -111,6 +116,9 @@ class AsyncStateSerializer : public td::actor::Actor {
 
   void update_options(td::Ref<ValidatorManagerOptions> opts);
   void auto_disable_serializer(bool disabled);
+
+  std::string current_status_ = "pending";
+  td::Timestamp current_status_ts_ = td::Timestamp::never();
 };
 
 }  // namespace validator
diff --git a/validator/stats-provider.h b/validator/stats-provider.h
new file mode 100644
index 00000000..e0a7f565
--- /dev/null
+++ b/validator/stats-provider.h
@@ -0,0 +1,105 @@
+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+#include "validator.h"
+#include "common/AtomicRef.h"
+
+#include <atomic>
+
+namespace ton {
+
+namespace validator {
+
+class StatsProvider {
+ public:
+  StatsProvider() = default;
+  StatsProvider(td::actor::ActorId<ValidatorManagerInterface> manager, std::string prefix,
+                std::function<void(td::Promise<std::vector<std::pair<std::string, std::string>>>)> callback)
+      : inited_(true), manager_(std::move(manager)) {
+    static std::atomic<td::uint64> cur_idx{0};
+    idx_ = cur_idx.fetch_add(1);
+    td::actor::send_closure(manager_, &ValidatorManagerInterface::register_stats_provider, idx_, std::move(prefix),
+                            std::move(callback));
+  }
+  StatsProvider(const StatsProvider&) = delete;
+  StatsProvider(StatsProvider&& other) noexcept
+      : inited_(other.inited_), idx_(other.idx_), manager_(std::move(other.manager_)) {
+    other.inited_ = false;
+  }
+  ~StatsProvider() {
+    if (inited_) {
+      td::actor::send_closure(manager_, &ValidatorManagerInterface::unregister_stats_provider, idx_);
+    }
+  }
+
+  StatsProvider& operator=(const StatsProvider&) = delete;
+  StatsProvider& operator=(StatsProvider&& other) noexcept {
+    if (this != &other) {
+      inited_ = other.inited_;
+      idx_ = other.idx_;
+      manager_ = std::move(other.manager_);
+      other.inited_ = false;
+    }
+    return *this;
+  }
+
+  bool inited() const {
+    return inited_;
+  }
+
+ private:
+  bool inited_ = false;
+  td::uint64 idx_ = 0;
+  td::actor::ActorId<ValidatorManagerInterface> manager_;
+};
+
+class ProcessStatus {
+ public:
+  ProcessStatus() = default;
+  ProcessStatus(td::actor::ActorId<ValidatorManagerInterface> manager, std::string name)
+      : stats_provider_(std::move(manager), std::move(name), [value = value_](auto promise) {
+        auto status = value->load();
+        if (status.is_null()) {
+          promise.set_error(td::Status::Error("empty"));
+          return;
+        }
+        std::vector<std::pair<std::string, std::string>> vec;
+        vec.emplace_back("", *status);
+        promise.set_value(std::move(vec));
+      }) {
+  }
+  ProcessStatus(const ProcessStatus&) = delete;
+  ProcessStatus(ProcessStatus&& other) noexcept = default;
+  ProcessStatus& operator=(const ProcessStatus&) = delete;
+  ProcessStatus& operator=(ProcessStatus&& other) noexcept = default;
+
+  void set_status(std::string s) {
+    if (!value_) {
+      return;
+    }
+    value_->store(td::Ref<td::Cnt<std::string>>(true, std::move(s)));
+  }
+
+ private:
+  std::shared_ptr<td::AtomicRef<td::Cnt<std::string>>> value_ = std::make_shared<td::AtomicRef<td::Cnt<std::string>>>();
+  StatsProvider stats_provider_;
+};
+
+}  // namespace validator
+
+}  // namespace ton
diff --git a/validator/validator.h b/validator/validator.h
index 73065aa9..42b3f69a 100644
--- a/validator/validator.h
+++ b/validator/validator.h
@@ -20,6 +20,7 @@
 
 #include <vector>
 #include <deque>
+#include <functional>
 
 #include "td/actor/actor.h"
 
@@ -292,6 +293,13 @@ class ValidatorManagerInterface : public td::actor::Actor {
   virtual void get_out_msg_queue_size(BlockIdExt block_id, td::Promise<td::uint64> promise) = 0;
 
   virtual void update_options(td::Ref<ValidatorManagerOptions> opts) = 0;
+
+  virtual void register_stats_provider(
+      td::uint64 idx, std::string prefix,
+      std::function<void(td::Promise<std::vector<std::pair<std::string, std::string>>>)> callback) {
+  }
+  virtual void unregister_stats_provider(td::uint64 idx) {
+  }
 };
 
 }  // namespace validator