diff --git a/conf/grafana/dashboards/backend-stats.json b/conf/grafana/dashboards/backend-stats.json
new file mode 100644
index 0000000..f0dd7b6
--- /dev/null
+++ b/conf/grafana/dashboards/backend-stats.json
@@ -0,0 +1,592 @@
+{
+  "annotations": {
+    "list": [
+      {
+        "builtIn": 1,
+        "datasource": "-- Grafana --",
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "type": "dashboard"
+      }
+    ]
+  },
+  "editable": true,
+  "gnetId": null,
+  "graphTooltip": 1,
+  "id": 4,
+   "links": [],
+  "panels": [
+    {
+      "aliasColors": {},
+      "bars": false,
+      "dashLength": 10,
+      "dashes": false,
+      "datasource": null,
+      "fill": 1,
+      "fillGradient": 0,
+      "gridPos": {
+        "h": 5,
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "hiddenSeries": false,
+      "id": 4,
+      "interval": "",
+      "legend": {
+        "avg": false,
+        "current": false,
+        "max": false,
+        "min": false,
+        "show": false,
+        "total": false,
+        "values": false
+      },
+      "lines": true,
+      "linewidth": 1,
+      "links": [],
+      "nullPointMode": "null",
+      "options": {
+        "dataLinks": []
+      },
+      "paceLength": 10,
+      "percentage": false,
+      "pointradius": 2,
+      "points": false,
+      "renderer": "flot",
+      "seriesOverrides": [
+        {
+          "alias": "mean resp time",
+          "yaxis": 2
+        }
+      ],
+      "spaceLength": 10,
+      "stack": false,
+      "steppedLine": false,
+      "targets": [
+        {
+          "expr": "rate(swh_storage_request_duration_seconds_count{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval])",
+          "format": "time_series",
+          "intervalFactor": 1,
+          "legendFormat": "number of req/s",
+          "refId": "A"
+        },
+        {
+          "expr": "rate(swh_storage_request_duration_seconds_sum{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval]) / rate(swh_storage_request_duration_seconds_count{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval])",
+          "legendFormat": "mean resp time",
+          "refId": "B"
+        }
+      ],
+      "thresholds": [],
+      "timeFrom": null,
+      "timeRegions": [],
+      "timeShift": null,
+      "title": "Requests",
+      "tooltip": {
+        "shared": true,
+        "sort": 0,
+        "value_type": "individual"
+      },
+      "type": "graph",
+      "xaxis": {
+        "buckets": null,
+        "mode": "time",
+        "name": null,
+        "show": true,
+        "values": []
+      },
+      "yaxes": [
+        {
+          "format": "short",
+          "label": null,
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        },
+        {
+          "format": "s",
+          "label": null,
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        }
+      ],
+      "yaxis": {
+        "align": false,
+        "alignLevel": null
+      }
+    },
+    {
+      "aliasColors": {},
+      "bars": false,
+      "dashLength": 10,
+      "dashes": false,
+      "datasource": null,
+      "description": "",
+      "fill": 1,
+      "fillGradient": 0,
+      "gridPos": {
+        "h": 5,
+        "w": 24,
+        "x": 0,
+        "y": 5
+      },
+      "hiddenSeries": false,
+      "id": 6,
+      "legend": {
+        "avg": false,
+        "current": false,
+        "max": false,
+        "min": false,
+        "show": false,
+        "total": false,
+        "values": false
+      },
+      "lines": true,
+      "linewidth": 1,
+      "links": [],
+      "nullPointMode": "null",
+      "options": {
+        "dataLinks": []
+      },
+      "percentage": false,
+      "pointradius": 2,
+      "points": false,
+      "renderer": "flot",
+      "seriesOverrides": [],
+      "spaceLength": 10,
+      "stack": false,
+      "steppedLine": false,
+      "targets": [
+        {
+          "expr": "sum by (object_type, operation) (rate(swh_storage_operations_bytes_total{instance=\"$instance\"} [$interval]))",
+          "format": "time_series",
+          "interval": "",
+          "intervalFactor": 1,
+          "legendFormat": "{{object_type}} {{operation}}ed",
+          "refId": "A"
+        }
+      ],
+      "thresholds": [],
+      "timeFrom": null,
+      "timeRegions": [],
+      "timeShift": null,
+      "title": "Data rates",
+      "tooltip": {
+        "shared": true,
+        "sort": 0,
+        "value_type": "individual"
+      },
+      "type": "graph",
+      "xaxis": {
+        "buckets": null,
+        "mode": "time",
+        "name": null,
+        "show": true,
+        "values": []
+      },
+      "yaxes": [
+        {
+          "format": "Bps",
+          "label": null,
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        },
+        {
+          "format": "short",
+          "label": null,
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        }
+      ],
+      "yaxis": {
+        "align": false,
+        "alignLevel": null
+      }
+    },
+    {
+      "aliasColors": {},
+      "bars": false,
+      "dashLength": 10,
+      "dashes": false,
+      "datasource": null,
+      "fill": 0,
+      "fillGradient": 0,
+      "gridPos": {
+        "h": 5,
+        "w": 24,
+        "x": 0,
+        "y": 10
+      },
+      "hiddenSeries": false,
+      "id": 7,
+      "interval": "",
+      "legend": {
+        "avg": false,
+        "current": false,
+        "max": false,
+        "min": false,
+        "show": false,
+        "total": false,
+        "values": false
+      },
+      "lines": true,
+      "linewidth": 0,
+      "links": [],
+      "nullPointMode": "null",
+      "options": {
+        "dataLinks": []
+      },
+      "paceLength": 10,
+      "percentage": false,
+      "pointradius": 0.5,
+      "points": false,
+      "renderer": "flot",
+      "seriesOverrides": [
+        {
+          "alias": "0.5",
+          "fill": 0,
+          "linewidth": 2
+        },
+        {
+          "alias": "0.75",
+          "fillBelowTo": "0.25",
+          "lines": false
+        },
+        {
+          "alias": "0.25",
+          "lines": false
+        },
+        {
+          "alias": "max",
+          "fill": 1,
+          "zindex": -3
+        }
+      ],
+      "spaceLength": 10,
+      "stack": false,
+      "steppedLine": false,
+      "targets": [
+        {
+          "expr": "rate(swh_storage_request_duration_seconds_sum{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval]) / rate(swh_storage_request_duration_seconds_count{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval])",
+          "format": "time_series",
+          "hide": true,
+          "instant": false,
+          "intervalFactor": 1,
+          "legendFormat": "mean",
+          "refId": "A"
+        },
+        {
+          "expr": "histogram_quantile(0.25, rate(swh_storage_request_duration_seconds_bucket{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval]))",
+          "instant": false,
+          "intervalFactor": 1,
+          "legendFormat": "0.25",
+          "refId": "B"
+        },
+        {
+          "expr": "histogram_quantile(0.5, rate(swh_storage_request_duration_seconds_bucket{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval]))",
+          "instant": false,
+          "intervalFactor": 1,
+          "legendFormat": "0.5",
+          "refId": "C"
+        },
+        {
+          "expr": "histogram_quantile(0.75, rate(swh_storage_request_duration_seconds_bucket{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval]))",
+          "instant": false,
+          "intervalFactor": 1,
+          "legendFormat": "0.75",
+          "refId": "D"
+        },
+        {
+          "expr": "histogram_quantile(1.0, rate(swh_storage_request_duration_seconds_bucket{instance=\"$instance\", endpoint=\"$endpoint\"}[$interval]))",
+          "instant": false,
+          "intervalFactor": 1,
+          "legendFormat": "max",
+          "refId": "E"
+        }
+      ],
+      "thresholds": [],
+      "timeFrom": null,
+      "timeRegions": [],
+      "timeShift": null,
+      "title": "Response time (25%-75%)",
+      "tooltip": {
+        "shared": true,
+        "sort": 0,
+        "value_type": "individual"
+      },
+      "type": "graph",
+      "xaxis": {
+        "buckets": null,
+        "mode": "time",
+        "name": null,
+        "show": true,
+        "values": []
+      },
+      "yaxes": [
+        {
+          "format": "s",
+          "label": null,
+          "logBase": 2,
+          "max": null,
+          "min": null,
+          "show": true
+        },
+        {
+          "format": "short",
+          "label": null,
+          "logBase": 1,
+          "max": null,
+          "min": null,
+          "show": true
+        }
+      ],
+      "yaxis": {
+        "align": false,
+        "alignLevel": null
+      }
+    },
+    {
+      "cards": {
+        "cardPadding": null,
+        "cardRound": null
+      },
+      "color": {
+        "cardColor": "#b4ff00",
+        "colorScale": "sqrt",
+        "colorScheme": "interpolateYlGnBu",
+        "exponent": 0.5,
+        "mode": "spectrum"
+      },
+      "dataFormat": "tsbuckets",
+      "datasource": null,
+      "gridPos": {
+        "h": 9,
+        "w": 24,
+        "x": 0,
+        "y": 15
+      },
+      "heatmap": {},
+      "hideZeroBuckets": true,
+      "highlightCards": true,
+      "id": 2,
+      "interval": "",
+      "legend": {
+        "show": false
+      },
+      "links": [],
+      "options": {},
+      "reverseYBuckets": false,
+      "targets": [
+        {
+          "expr": "rate(swh_storage_request_duration_seconds_bucket{instance=\"$instance\",endpoint=\"$endpoint\"}[$interval])",
+          "format": "heatmap",
+          "interval": "",
+          "intervalFactor": 1,
+          "legendFormat": "{{le}}",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Response time distribution",
+      "tooltip": {
+        "show": true,
+        "showHistogram": true
+      },
+      "type": "heatmap",
+      "xAxis": {
+        "show": true
+      },
+      "xBucketNumber": null,
+      "xBucketSize": null,
+      "yAxis": {
+        "decimals": 0,
+        "format": "s",
+        "logBase": 1,
+        "max": null,
+        "min": null,
+        "show": true,
+        "splitFactor": null
+      },
+      "yBucketBound": "upper",
+      "yBucketNumber": null,
+      "yBucketSize": null
+    }
+  ],
+  "refresh": "30s",
+  "schemaVersion": 22,
+  "style": "dark",
+  "tags": [],
+  "templating": {
+    "list": [
+      {
+        "auto": true,
+        "auto_count": 50,
+        "auto_min": "2m",
+        "current": {
+          "selected": false,
+          "text": "auto",
+          "value": "$__auto_interval_interval"
+        },
+        "hide": 0,
+        "label": null,
+        "name": "interval",
+        "options": [
+          {
+            "selected": true,
+            "text": "auto",
+            "value": "$__auto_interval_interval"
+          },
+          {
+            "selected": false,
+            "text": "2m",
+            "value": "2m"
+          },
+          {
+            "selected": false,
+            "text": "10m",
+            "value": "10m"
+          },
+          {
+            "selected": false,
+            "text": "30m",
+            "value": "30m"
+          },
+          {
+            "selected": false,
+            "text": "1h",
+            "value": "1h"
+          },
+          {
+            "selected": false,
+            "text": "6h",
+            "value": "6h"
+          },
+          {
+            "selected": false,
+            "text": "12h",
+            "value": "12h"
+          },
+          {
+            "selected": false,
+            "text": "1d",
+            "value": "1d"
+          },
+          {
+            "selected": false,
+            "text": "7d",
+            "value": "7d"
+          },
+          {
+            "selected": false,
+            "text": "14d",
+            "value": "14d"
+          },
+          {
+            "selected": false,
+            "text": "30d",
+            "value": "30d"
+          }
+        ],
+        "query": "2m,10m,30m,1h,6h,12h,1d,7d,14d,30d",
+        "refresh": 2,
+        "skipUrlSync": false,
+        "type": "interval"
+      },
+      {
+        "allValue": null,
+        "current": {
+          "selected": true,
+          "text": "prometheus-statsd-exporter:9102",
+          "value": "prometheus-statsd-exporter:9102"
+        },
+        "datasource": "Prometheus",
+        "definition": "label_values(swh_storage_request_duration_seconds_bucket, instance)",
+        "hide": 0,
+        "includeAll": false,
+        "label": null,
+        "multi": false,
+        "name": "instance",
+        "options": [],
+        "query": "label_values(swh_storage_request_duration_seconds_bucket, instance)",
+        "refresh": 1,
+        "regex": "",
+        "skipUrlSync": false,
+        "sort": 0,
+        "tagValuesQuery": "",
+        "tags": [],
+        "tagsQuery": "",
+        "type": "query",
+        "useTags": false
+      },
+      {
+        "allValue": null,
+        "current": {
+          "selected": true,
+          "text": "revision_add",
+          "value": "revision_add"
+        },
+        "datasource": "Prometheus",
+        "definition": "label_values(swh_storage_request_duration_seconds_bucket{instance=\"$instance\"}, endpoint)",
+        "hide": 0,
+        "includeAll": false,
+        "label": null,
+        "multi": false,
+        "name": "endpoint",
+        "options": [],
+        "query": "label_values(swh_storage_request_duration_seconds_bucket{instance=\"$instance\"}, endpoint)",
+        "refresh": 1,
+        "regex": "",
+        "skipUrlSync": false,
+        "sort": 1,
+        "tagValuesQuery": "",
+        "tags": [],
+        "tagsQuery": "",
+        "type": "query",
+        "useTags": false
+      }
+    ]
+  },
+  "time": {
+    "from": "now-6h",
+    "to": "now"
+  },
+  "timepicker": {
+    "refresh_intervals": [
+      "5s",
+      "10s",
+      "30s",
+      "1m",
+      "5m",
+      "15m",
+      "30m",
+      "1h",
+      "2h",
+      "1d"
+    ],
+    "time_options": [
+      "5m",
+      "15m",
+      "1h",
+      "6h",
+      "12h",
+      "24h",
+      "2d",
+      "7d",
+      "30d"
+    ]
+  },
+  "timezone": "",
+  "title": "Storage backend statistics",
+  "uid": "8ywqc76mk",
+  "version": 1
+}
diff --git a/conf/grafana/dashboards/graph-replayer.json b/conf/grafana/dashboards/graph-replayer.json
index 88d6288..5f14339 100644
--- a/conf/grafana/dashboards/graph-replayer.json
+++ b/conf/grafana/dashboards/graph-replayer.json
@@ -1,138 +1,138 @@
 {
   "annotations": {
     "list": [
       {
         "builtIn": 1,
         "datasource": "-- Grafana --",
         "enable": true,
         "hide": true,
         "iconColor": "rgba(0, 211, 255, 1)",
         "name": "Annotations & Alerts",
         "type": "dashboard"
       }
     ]
   },
   "editable": true,
   "gnetId": null,
   "graphTooltip": 0,
-  "id": 3,
+  "id": 1,
   "links": [],
   "panels": [
     {
       "aliasColors": {},
       "bars": false,
       "dashLength": 10,
       "dashes": false,
       "datasource": null,
-      "fill": 1,
+      "fill": 3,
       "fillGradient": 0,
       "gridPos": {
         "h": 9,
         "w": 24,
         "x": 0,
         "y": 0
       },
       "hiddenSeries": false,
       "id": 2,
       "legend": {
         "avg": false,
         "current": false,
         "max": false,
         "min": false,
         "show": true,
         "total": false,
         "values": false
       },
       "lines": true,
-      "linewidth": 1,
+      "linewidth": 0,
       "nullPointMode": "null",
       "options": {
         "dataLinks": []
       },
       "percentage": false,
       "pointradius": 2,
       "points": false,
       "renderer": "flot",
       "seriesOverrides": [],
       "spaceLength": 10,
-      "stack": false,
+      "stack": true,
       "steppedLine": false,
       "targets": [
         {
           "expr": "rate(swh_graph_replayer_operations_total[5m])",
           "legendFormat": "{{object_type}}",
           "refId": "A"
         }
       ],
       "thresholds": [],
       "timeFrom": null,
       "timeRegions": [],
       "timeShift": null,
       "title": "Graph Replayer Object processed",
       "tooltip": {
         "shared": true,
-        "sort": 0,
+        "sort": 2,
         "value_type": "individual"
       },
       "type": "graph",
       "xaxis": {
         "buckets": null,
         "mode": "time",
         "name": null,
         "show": true,
         "values": []
       },
       "yaxes": [
         {
           "format": "ops",
           "label": null,
           "logBase": 1,
           "max": null,
           "min": null,
           "show": true
         },
         {
           "format": "short",
           "label": null,
           "logBase": 1,
           "max": null,
           "min": null,
           "show": true
         }
       ],
       "yaxis": {
         "align": false,
         "alignLevel": null
       }
     }
   ],
   "refresh": "5s",
-  "schemaVersion": 21,
+  "schemaVersion": 22,
   "style": "dark",
   "tags": [],
   "templating": {
     "list": []
   },
   "time": {
     "from": "now-6h",
     "to": "now"
   },
   "timepicker": {
     "refresh_intervals": [
       "5s",
       "10s",
       "30s",
       "1m",
       "5m",
       "15m",
       "30m",
       "1h",
       "2h",
       "1d"
     ]
   },
   "timezone": "",
   "title": "Graph Replayer",
   "uid": "nJ_uDV-Zk",
   "version": 1
-}
+}
\ No newline at end of file