fix network metrics & grafana dashboard

number of top process consumer in config

docker-compose/grafana/provisioning/dashboards/bottom-overview.json

@@ -66,12 +66,12 @@
         "gridPos": {"h": 8, "w": 12, "x": 0, "y": 8},
         "targets": [
           {
-            "expr": "system_network_rx_bytes_rate",
+            "expr": "system_network_rx_bytes_per_sec",
             "legendFormat": "RX - {{interface}}",
             "refId": "RX"
           },
           {
-            "expr": "system_network_tx_bytes_rate",
+            "expr": "system_network_tx_bytes_per_sec",
             "legendFormat": "TX - {{interface}}",
             "refId": "TX"
           }