Update units of network ad disk graphs

https://prometheus.io/docs/prometheus/latest/querying/functions/#rate

rate() calculates per-second average rate, therefore Bps units should be used for disks.

In networking bandwidth throughput is usually measured in bits/s so units are changed accordingly.

Signed-off-by: Vitaly Zhuravlev <zhuravlev.vitaly@gmail.com>

docs/node-mixin/lib/prom-mixin.libsonnet

@@ -213,7 +213,7 @@ local table = grafana70.panel.table;
           },
         ],
         yaxes: [
-          self.yaxe(format='bytes'),
+          self.yaxe(format='Bps'),
           self.yaxe(format='s'),
         ],
       },
@@ -410,28 +410,30 @@ local table = grafana70.panel.table;
     local networkReceived =
       graphPanel.new(
         'Network Received',
+        description="Network received (bits/s)",
         datasource='$datasource',
         span=6,
-        format='bytes',
+        format='bps',
         min=0,
         fill=0,
       )
       .addTarget(prometheus.target(
-        'rate(node_network_receive_bytes_total{%(nodeExporterSelector)s, instance="$instance", device!="lo"}[$__rate_interval])' % config,
+        'rate(node_network_receive_bytes_total{%(nodeExporterSelector)s, instance="$instance", device!="lo"}[$__rate_interval]) * 8' % config,
         legendFormat='{{device}}',
       )),
 
     local networkTransmitted =
       graphPanel.new(
         'Network Transmitted',
+        description="Network transmitted (bits/s)",
         datasource='$datasource',
         span=6,
-        format='bytes',
+        format='bps',
         min=0,
         fill=0,
       )
       .addTarget(prometheus.target(
-        'rate(node_network_transmit_bytes_total{%(nodeExporterSelector)s, instance="$instance", device!="lo"}[$__rate_interval])' % config,
+        'rate(node_network_transmit_bytes_total{%(nodeExporterSelector)s, instance="$instance", device!="lo"}[$__rate_interval]) * 8' % config,
         legendFormat='{{device}}',
       )),