foyer-rs
diff --git a/‎docker-compose.yaml
+1-1 b/‎docker-compose.yaml
+1-1
diff --git a/‎etc/grafana/dashboards/foyer.json
+1-1 b/‎etc/grafana/dashboards/foyer.json
+1-1
diff --git a/‎foyer-bench/src/main.rs
+5-1 b/‎foyer-bench/src/main.rs
+5-1
diff --git a/‎foyer-common/src/metrics.rs
+18-2 b/‎foyer-common/src/metrics.rs
+18-2
@@ -44,6 +44,7 @@ services:
       - 3000:3000
     environment:
       - GF_AUTH_ANONYMOUS_ENABLED=true
+      - NO_PROXY=prometheus
 
   jaeger:
     image: jaegertracing/all-in-one:latest
@@ -56,4 +57,3 @@ services:
       - 6832:6832/udp
       - 16686:16686
       - 4317:4317
-    
@@ -245,6 +245,9 @@ struct Args {
     #[arg(long, value_parser = PossibleValuesParser::new(["lru", "lfu", "fifo", "s3fifo"]), default_value = "lru")]
     eviction: String,
 
+    #[arg(long, default_value_t = ByteSize::mib(16))]
+    buffer_pool_size: ByteSize,
+
     #[arg(long, default_value_t = ByteSize::kib(16))]
     set_size: ByteSize,
 
@@ -513,7 +516,8 @@ async fn benchmark(args: Args) {
         .with_eviction_pickers(vec![
             Box::new(InvalidRatioPicker::new(args.invalid_ratio)),
             Box::<FifoPicker>::default(),
-        ]);
+        ])
+        .with_buffer_pool_size(args.buffer_pool_size.as_u64() as _);
 
     let small = SmallEngineOptions::new()
         .with_flushers(args.flushers)
 
@@ -12,12 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::borrow::Cow;
+use std::{borrow::Cow, fmt::Debug};
 
 use mixtrics::metrics::{BoxedCounter, BoxedGauge, BoxedHistogram, BoxedRegistry};
 
 #[expect(missing_docs)]
-#[derive(Debug)]
 pub struct Metrics {
     /* in-memory cache metrics */
     pub memory_insert: BoxedCounter,
@@ -68,6 +67,8 @@ pub struct Metrics {
     pub storage_entry_serialize_duration: BoxedHistogram,
     pub storage_entry_deserialize_duration: BoxedHistogram,
 
+    pub storage_blob_efficiency: BoxedHistogram,
+
     /* hybrid cache metrics */
     pub hybrid_insert: BoxedCounter,
     pub hybrid_hit: BoxedCounter,
@@ -81,6 +82,12 @@ pub struct Metrics {
     pub hybrid_fetch_duration: BoxedHistogram,
 }
 
+impl Debug for Metrics {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Metrics").finish()
+    }
+}
+
 impl Metrics {
     /// Create a new metric with the given name.
     pub fn new(name: impl Into<Cow<'static, str>>, registry: &BoxedRegistry) -> Self {
@@ -169,6 +176,12 @@ impl Metrics {
             &["name", "op"],
         );
 
+        let foyer_storage_blob_efficiency = registry.register_histogram_vec(
+            "foyer_storage_blob_efficiency".into(),
+            "foyer large object disk cache entry count in a blob".into(),
+            &["name"],
+        );
+
         let storage_enqueue = foyer_storage_op_total.counter(&[name.clone(), "enqueue".into()]);
         let storage_hit = foyer_storage_op_total.counter(&[name.clone(), "hit".into()]);
         let storage_miss = foyer_storage_op_total.counter(&[name.clone(), "miss".into()]);
@@ -207,6 +220,8 @@ impl Metrics {
         let storage_entry_deserialize_duration =
             foyer_storage_entry_serde_duration.histogram(&[name.clone(), "deserialize".into()]);
 
+        let storage_blob_efficiency = foyer_storage_blob_efficiency.histogram(&[name.clone()]);
+
         /* hybrid cache metrics */
 
         let foyer_hybrid_op_total = registry.register_counter_vec(
@@ -269,6 +284,7 @@ impl Metrics {
             storage_region_size_bytes,
             storage_entry_serialize_duration,
             storage_entry_deserialize_duration,
+            storage_blob_efficiency,
 
             hybrid_insert,
             hybrid_hit,