diff --git a/etc/grafana-dashboards/runkv-overview.json b/etc/grafana-dashboards/runkv-overview.json
index 4387a60..fd4d4ac 100644
--- a/etc/grafana-dashboards/runkv-overview.json
+++ b/etc/grafana-dashboards/runkv-overview.json
@@ -122,7 +122,7 @@
             "uid": "PEDE6B306CC9C0CD0"
           },
           "editorMode": "code",
-          "expr": "sum(irate(kv_service_latency_histogram_vec_sum[1m]))",
+          "expr": "sum(irate(kv_service_latency_histogram_vec_count{ service=\"get,put,delete,snapshot,txn\"}[1m]))",
           "hide": false,
           "legendFormat": "total",
           "range": true,
@@ -134,7 +134,7 @@
             "uid": "PEDE6B306CC9C0CD0"
           },
           "editorMode": "code",
-          "expr": "sum(irate(kv_service_latency_histogram_vec_sum[1m])) by (service)",
+          "expr": "sum by (service) (irate(kv_service_latency_histogram_vec_count[1m]))",
           "hide": false,
           "legendFormat": "{{service}}",
           "range": true,
@@ -1252,8 +1252,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -1343,8 +1342,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -1434,8 +1432,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -1552,8 +1549,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -1643,8 +1639,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -1768,8 +1763,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -1886,8 +1880,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -1977,8 +1970,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2102,8 +2094,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2220,8 +2211,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2324,8 +2314,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2415,8 +2404,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2584,8 +2572,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2702,8 +2689,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2793,8 +2779,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2884,8 +2869,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -2975,8 +2959,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -3093,8 +3076,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -3184,8 +3166,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -3302,8 +3283,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -3393,8 +3373,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -3517,8 +3496,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -3668,8 +3646,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -3761,8 +3738,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -3865,8 +3841,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -4016,8 +3991,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -4120,8 +4094,7 @@
             "mode": "absolute",
             "steps": [
               {
-                "color": "green",
-                "value": null
+                "color": "green"
               },
               {
                 "color": "red",
@@ -4237,6 +4210,6 @@
   "timezone": "",
   "title": "RunKV Overview",
   "uid": "kJf6Tv_nk",
-  "version": 1,
+  "version": 2,
   "weekStart": ""
 }
\ No newline at end of file
diff --git a/wheel/src/components/lsm_tree.rs b/wheel/src/components/lsm_tree.rs
index c4b550d..5099c97 100644
--- a/wheel/src/components/lsm_tree.rs
+++ b/wheel/src/components/lsm_tree.rs
@@ -243,8 +243,6 @@ impl ObjectStoreLsmTreeCore {
     }
 }
 
-unsafe impl Sync for ObjectStoreLsmTreeCore {}
-
 #[derive(Clone)]
 pub struct ObjectStoreLsmTree {
     raft_node: u64,