diff --git a/node/storage/src/log_store/flow_store.rs b/node/storage/src/log_store/flow_store.rs
index 01e1b75..d630e2c 100644
--- a/node/storage/src/log_store/flow_store.rs
+++ b/node/storage/src/log_store/flow_store.rs
@@ -2,7 +2,8 @@ use crate::config::ShardConfig;
 use crate::error::Error;
 use crate::log_store::load_chunk::EntryBatch;
 use crate::log_store::log_manager::{
-    bytes_to_entries, COL_ENTRY_BATCH, COL_FLOW_MPT_NODES, PORA_CHUNK_SIZE, COL_PAD_DATA_LIST, COL_PAD_DATA_SYNC_HEIGH
+    bytes_to_entries, COL_ENTRY_BATCH, COL_FLOW_MPT_NODES, COL_PAD_DATA_LIST,
+    COL_PAD_DATA_SYNC_HEIGH, PORA_CHUNK_SIZE,
 };
 use crate::log_store::seal_task_manager::SealTaskManager;
 use crate::log_store::{
diff --git a/node/storage/src/log_store/log_manager.rs b/node/storage/src/log_store/log_manager.rs
index 526b3c3..8a9d161 100644
--- a/node/storage/src/log_store/log_manager.rs
+++ b/node/storage/src/log_store/log_manager.rs
@@ -1289,6 +1289,7 @@ pub fn data_to_merkle_leaves(leaf_data: &[u8]) -> Result<Vec<H256>> {
             .collect()
     };
 
+    metrics::DATA_TO_MERKLE_LEAVES_SIZE.update(leaf_data.len());
     metrics::DATA_TO_MERKLE_LEAVES.update_since(start_time);
     Ok(r)
 }
diff --git a/node/storage/src/log_store/metrics.rs b/node/storage/src/log_store/metrics.rs
index 55706a3..70ddfda 100644
--- a/node/storage/src/log_store/metrics.rs
+++ b/node/storage/src/log_store/metrics.rs
@@ -1,6 +1,6 @@
 use std::sync::Arc;
 
-use metrics::{register_timer, Timer};
+use metrics::{register_timer, Gauge, GaugeUsize, Timer};
 
 lazy_static::lazy_static! {
     pub static ref PUT_TX: Arc<dyn Timer> = register_timer("log_store_put_tx");
@@ -36,4 +36,6 @@ lazy_static::lazy_static! {
     pub static ref APPEND_ENTRIES: Arc<dyn Timer> = register_timer("log_store_flow_store_append_entries");
 
     pub static ref FINALIZE_TX_WITH_HASH: Arc<dyn Timer> = register_timer("log_store_log_manager_finalize_tx_with_hash");
+
+    pub static ref DATA_TO_MERKLE_LEAVES_SIZE: Arc<dyn Gauge<usize>> = GaugeUsize::register("log_store_data_to_merkle_leaves_size");
 }