diff --git a/ydb/core/persqueue/pq_impl.cpp b/ydb/core/persqueue/pq_impl.cpp
index cfc914324e40..1d9ca8e3e1b1 100644
--- a/ydb/core/persqueue/pq_impl.cpp
+++ b/ydb/core/persqueue/pq_impl.cpp
@@ -978,6 +978,7 @@ void TPersQueue::ReadConfig(const NKikimrClient::TKeyValueResponse::TReadResult&
             }
 
             Txs.emplace(tx.GetTxId(), tx);
+            SetTxInFlyCounter();
 
             if (tx.HasStep()) {
                 if (std::make_pair(tx.GetStep(), tx.GetTxId()) >= std::make_pair(ExecStep, ExecTxId)) {
@@ -994,6 +995,8 @@ void TPersQueue::ReadConfig(const NKikimrClient::TKeyValueResponse::TReadResult&
 
     EndInitTransactions();
     EndReadConfig(ctx);
+
+    SetTxCounters();
 }
 
 void TPersQueue::EndReadConfig(const TActorContext& ctx)
@@ -3081,6 +3084,7 @@ void TPersQueue::HandleWakeup(const TActorContext& ctx) {
     }
     MeteringSink.MayFlush(ctx.Now());
     DeleteExpiredTransactions(ctx);
+    SetTxCounters();
     ctx.Schedule(TDuration::Seconds(5), new TEvents::TEvWakeup());
 }
 
@@ -3101,6 +3105,33 @@ void TPersQueue::DeleteExpiredTransactions(const TActorContext& ctx)
     TryWriteTxs(ctx);
 }
 
+void TPersQueue::SetTxCounters()
+{
+    SetTxCompleteLagCounter();
+    SetTxInFlyCounter();
+}
+
+void TPersQueue::SetTxCompleteLagCounter()
+{
+    ui64 lag = 0;
+
+    if (!TxQueue.empty()) {
+        ui64 firstTxStep = TxQueue.front().first;
+        ui64 currentStep = TAppData::TimeProvider->Now().MilliSeconds();
+
+        if (currentStep > firstTxStep) {
+            lag = currentStep - firstTxStep;
+        }
+    }
+
+    Counters->Simple()[COUNTER_PQ_TABLET_TX_COMPLETE_LAG] = lag;
+}
+
+void TPersQueue::SetTxInFlyCounter()
+{
+    Counters->Simple()[COUNTER_PQ_TABLET_TX_IN_FLY] = Txs.size();
+}
+
 void TPersQueue::Handle(TEvPersQueue::TEvCancelTransactionProposal::TPtr& ev, const TActorContext& ctx)
 {
     PQ_LOG_D("Handle TEvPersQueue::TEvCancelTransactionProposal");
@@ -3575,6 +3606,7 @@ void TPersQueue::ProcessProposeTransactionQueue(const TActorContext& ctx)
 
         const NKikimrPQ::TEvProposeTransaction& event = front->GetRecord();
         TDistributedTransaction& tx = Txs[event.GetTxId()];
+        SetTxInFlyCounter();
 
         switch (tx.State) {
         case NKikimrPQ::TTransaction::UNKNOWN:
@@ -3656,6 +3688,7 @@ void TPersQueue::ProcessPlanStepQueue(const TActorContext& ctx)
                         TryExecuteTxs(ctx, tx);
 
                         TxQueue.emplace_back(step, txId);
+                        SetTxCompleteLagCounter();
                     } else {
                         LOG_WARN_S(ctx, NKikimrServices::PERSQUEUE,
                                    "Tablet " << TabletID() <<
@@ -4392,6 +4425,11 @@ void TPersQueue::CheckTxState(const TActorContext& ctx,
         Y_ABORT_UNLESS(tx.TxId == TxsOrder[tx.State].front(),
                        "PQ %" PRIu64 ", TxId %" PRIu64 ", FrontTxId %" PRIu64,
                        TabletID(), tx.TxId, TxsOrder[tx.State].front());
+        Y_ABORT_UNLESS(tx.TxId == TxQueue.front().second,
+                       "PQ %" PRIu64 ", TxId %" PRIu64 ", FrontTxId %" PRIu64,
+                       TabletID(), tx.TxId, TxQueue.front().second);
+        TxQueue.pop_front();
+        SetTxCompleteLagCounter();
 
         SendEvReadSetAckToSenders(ctx, tx);
 
@@ -4411,13 +4449,10 @@ void TPersQueue::CheckTxState(const TActorContext& ctx,
 
     case NKikimrPQ::TTransaction::DELETING:
         // The PQ tablet has persisted its state. Now she can delete the transaction and take the next one.
-        if (!TxQueue.empty() && (TxQueue.front().second == tx.TxId)) {
-            TxQueue.pop_front();
-        }
-
         DeleteWriteId(tx.WriteId);
         PQ_LOG_D("delete TxId " << tx.TxId);
         Txs.erase(tx.TxId);
+        SetTxInFlyCounter();
 
         // If this was the last transaction, then you need to send responses to messages about changes
         // in the status of the PQ tablet (if they came)
diff --git a/ydb/core/persqueue/pq_impl.h b/ydb/core/persqueue/pq_impl.h
index 2fdc0d1bf16e..5dee69618f72 100644
--- a/ydb/core/persqueue/pq_impl.h
+++ b/ydb/core/persqueue/pq_impl.h
@@ -441,6 +441,10 @@ class TPersQueue : public NKeyValue::TKeyValueFlat {
     void DeleteExpiredTransactions(const TActorContext& ctx);
     void Handle(TEvPersQueue::TEvCancelTransactionProposal::TPtr& ev, const TActorContext& ctx);
 
+    void SetTxCounters();
+    void SetTxCompleteLagCounter();
+    void SetTxInFlyCounter();
+
     bool CanProcessProposeTransactionQueue() const;
     bool CanProcessPlanStepQueue() const;
     bool CanProcessWriteTxs() const;
diff --git a/ydb/core/protos/counters_pq.proto b/ydb/core/protos/counters_pq.proto
index 8c975d9a4b7b..6aab74eb959f 100644
--- a/ydb/core/protos/counters_pq.proto
+++ b/ydb/core/protos/counters_pq.proto
@@ -68,6 +68,8 @@ enum ESimpleCounters {
     COUNTER_PQ_TABLET_OPENED_PIPES = 5                               [(CounterOpts) = {Name: "OpenedPipes"}];
     COUNTER_PQ_TABLET_INFLIGHT = 6                                   [(CounterOpts) = {Name: "RequestsInflight"}];
 
+    COUNTER_PQ_TABLET_TX_COMPLETE_LAG = 7                            [(CounterOpts) = {Name: "TxCompleteLag"}];
+    COUNTER_PQ_TABLET_TX_IN_FLY = 8                                  [(CounterOpts) = {Name: "TxInFly"}];
 }
 
 enum EPercentileCounters {