diff --git a/narwhal/worker/src/batch_maker.rs b/narwhal/worker/src/batch_maker.rs
index fc45ab33b488c..6f5bc04bd0c2c 100644
--- a/narwhal/worker/src/batch_maker.rs
+++ b/narwhal/worker/src/batch_maker.rs
@@ -1,9 +1,11 @@
 // Copyright (c) 2021, Facebook, Inc. and its affiliates
 // Copyright (c) 2022, Mysten Labs, Inc.
 // SPDX-License-Identifier: Apache-2.0
+use crate::metrics::WorkerMetrics;
 use config::Committee;
 #[cfg(feature = "benchmark")]
 use std::convert::TryInto;
+use std::sync::Arc;
 use tokio::{
     sync::watch,
     task::JoinHandle,
@@ -37,6 +39,8 @@ pub struct BatchMaker {
     current_batch: Batch,
     /// Holds the size of the current batch (in bytes).
     current_batch_size: usize,
+    /// Metrics handler
+    node_metrics: Arc<WorkerMetrics>,
 }
 
 impl BatchMaker {
@@ -48,6 +52,7 @@ impl BatchMaker {
         rx_reconfigure: watch::Receiver<ReconfigureNotification>,
         rx_transaction: Receiver<Transaction>,
         tx_message: Sender<Batch>,
+        node_metrics: Arc<WorkerMetrics>,
     ) -> JoinHandle<()> {
         tokio::spawn(async move {
             Self {
@@ -59,6 +64,7 @@ impl BatchMaker {
                 tx_message,
                 current_batch: Batch(Vec::with_capacity(batch_size * 2)),
                 current_batch_size: 0,
+                node_metrics,
             }
             .run()
             .await;
@@ -77,7 +83,7 @@ impl BatchMaker {
                     self.current_batch_size += transaction.len();
                     self.current_batch.0.push(transaction);
                     if self.current_batch_size >= self.batch_size {
-                        self.seal().await;
+                        self.seal(false).await;
                         timer.as_mut().reset(Instant::now() + self.max_batch_delay);
                     }
                 },
@@ -85,7 +91,7 @@ impl BatchMaker {
                 // If the timer triggers, seal the batch even if it contains few transactions.
                 () = &mut timer => {
                     if !self.current_batch.0.is_empty() {
-                        self.seal().await;
+                        self.seal(true).await;
                     }
                     timer.as_mut().reset(Instant::now() + self.max_batch_delay);
                 }
@@ -114,8 +120,7 @@ impl BatchMaker {
     }
 
     /// Seal and broadcast the current batch.
-    async fn seal(&mut self) {
-        #[cfg(feature = "benchmark")]
+    async fn seal(&mut self, timeout: bool) {
         let size = self.current_batch_size;
 
         // Look for sample txs (they all start with 0) and gather their txs id (the next 8 bytes).
@@ -154,6 +159,13 @@ impl BatchMaker {
             }
         }
 
+        let reason = if timeout { "timeout" } else { "size_reached" };
+
+        self.node_metrics
+            .created_batch_size
+            .with_label_values(&[self.committee.epoch.to_string().as_str(), reason])
+            .observe(size as f64);
+
         // Send the batch through the deliver channel for further processing.
         if self.tx_message.send(batch).await.is_err() {
             tracing::debug!("{}", DagError::ShuttingDown);
diff --git a/narwhal/worker/src/metrics.rs b/narwhal/worker/src/metrics.rs
index 079e7d0935035..e6fe454db4e10 100644
--- a/narwhal/worker/src/metrics.rs
+++ b/narwhal/worker/src/metrics.rs
@@ -44,6 +44,8 @@ pub fn initialise_metrics(metrics_registry: &Registry) -> Metrics {
 pub struct WorkerMetrics {
     /// Number of elements pending elements in the worker synchronizer
     pub pending_elements_worker_synchronizer: IntGaugeVec,
+    /// Number of created batches from the batch_maker
+    pub created_batch_size: HistogramVec,
 }
 
 impl WorkerMetrics {
@@ -56,6 +58,13 @@ impl WorkerMetrics {
                 registry
             )
             .unwrap(),
+            created_batch_size: register_histogram_vec_with_registry!(
+                "created_batch_size",
+                "Size in bytes of the created batches",
+                &["epoch", "reason"],
+                registry
+            )
+            .unwrap(),
         }
     }
 }
diff --git a/narwhal/worker/src/tests/batch_maker_tests.rs b/narwhal/worker/src/tests/batch_maker_tests.rs
index 50597aabc0660..d8816ca4346df 100644
--- a/narwhal/worker/src/tests/batch_maker_tests.rs
+++ b/narwhal/worker/src/tests/batch_maker_tests.rs
@@ -2,6 +2,7 @@
 // Copyright (c) 2022, Mysten Labs, Inc.
 // SPDX-License-Identifier: Apache-2.0
 use super::*;
+use prometheus::Registry;
 use test_utils::{committee, transaction};
 
 #[tokio::test]
@@ -11,6 +12,7 @@ async fn make_batch() {
         watch::channel(ReconfigureNotification::NewEpoch(committee.clone()));
     let (tx_transaction, rx_transaction) = test_utils::test_channel!(1);
     let (tx_message, mut rx_message) = test_utils::test_channel!(1);
+    let node_metrics = WorkerMetrics::new(&Registry::new());
 
     // Spawn a `BatchMaker` instance.
     let _batch_maker_handle = BatchMaker::spawn(
@@ -21,6 +23,7 @@ async fn make_batch() {
         rx_reconfiguration,
         rx_transaction,
         tx_message,
+        Arc::new(node_metrics),
     );
 
     // Send enough transactions to seal a batch.
@@ -41,6 +44,7 @@ async fn batch_timeout() {
         watch::channel(ReconfigureNotification::NewEpoch(committee.clone()));
     let (tx_transaction, rx_transaction) = test_utils::test_channel!(1);
     let (tx_message, mut rx_message) = test_utils::test_channel!(1);
+    let node_metrics = WorkerMetrics::new(&Registry::new());
 
     // Spawn a `BatchMaker` instance.
     let _batch_maker_handle = BatchMaker::spawn(
@@ -51,6 +55,7 @@ async fn batch_timeout() {
         rx_reconfiguration,
         rx_transaction,
         tx_message,
+        Arc::new(node_metrics),
     );
 
     // Do not send enough transactions to seal a batch.
diff --git a/narwhal/worker/src/worker.rs b/narwhal/worker/src/worker.rs
index d87bd9c306f67..538cdf87f2ab1 100644
--- a/narwhal/worker/src/worker.rs
+++ b/narwhal/worker/src/worker.rs
@@ -89,6 +89,7 @@ impl Worker {
         let client_flow_handles = worker.handle_clients_transactions(
             &tx_reconfigure,
             tx_primary.clone(),
+            node_metrics.clone(),
             channel_metrics.clone(),
             endpoint_metrics,
             network_metrics.clone(),
@@ -188,6 +189,7 @@ impl Worker {
         &self,
         tx_reconfigure: &watch::Sender<ReconfigureNotification>,
         tx_primary: Sender<WorkerPrimaryMessage>,
+        node_metrics: Arc<WorkerMetrics>,
         channel_metrics: Arc<WorkerChannelMetrics>,
         endpoint_metrics: WorkerEndpointMetrics,
         network_metrics: Arc<WorkerNetworkMetrics>,
@@ -225,6 +227,7 @@ impl Worker {
             tx_reconfigure.subscribe(),
             /* rx_transaction */ rx_batch_maker,
             /* tx_message */ tx_quorum_waiter,
+            node_metrics,
         );
 
         // The `QuorumWaiter` waits for 2f authorities to acknowledge reception of the batch. It then forwards