Add diskDevice selector

Signed-off-by: Vitaly Zhuravlev <v-zhuravlev@users.noreply.github.com>

docs/node-mixin/alerts/alerts.libsonnet

@@ -340,7 +340,7 @@
           {
             alert: 'NodeDiskIOSaturation',
             expr: |||
-              rate(node_disk_io_time_weighted_seconds_total{%(nodeExporterSelector)s}[5m]) > 10
+              rate(node_disk_io_time_weighted_seconds_total{%(nodeExporterSelector)s, %(diskDeviceSelector)s}[5m]) > 10
             ||| % $._config,
             'for': '30m',
             labels: {
@@ -349,7 +349,7 @@
             annotations: {
               summary: 'Disk IO queue is high.',
               description: |||
-                Disk IO queue (aqu-sq) is high on {{ $labels.device }} at {{ $labels.instance }}, has been above 10 for the last 15 minutes, is currently at {{ printf "%.2f" $value }}%.
+                Disk IO queue (aqu-sq) is high on {{ $labels.device }} at {{ $labels.instance }}, has been above 10 for the last 15 minutes, is currently at {{ printf "%.2f" $value }}.
                 This symptom might indicate disk saturation.,
               |||,
             },