Add DWPD to Hardware Overview dashboard

Adds the DWPD (Drive Writes Per Day) to the Hardware Overview dashboard
in Grafana. This is useful for monitoring the wear on NVMEs.

Author: technowhizz

etc/kayobe/kolla/config/grafana/dashboards/openstack/hardware_overview.json

@@ -637,8 +637,8 @@
         "overrides": []
       },
       "gridPos": {
-        "h": 12,
-        "w": 20,
+        "h": 13,
+        "w": 9,
         "x": 0,
         "y": 17
       },
@@ -674,6 +674,95 @@
       ],
       "title": "Disk Temperatures",
       "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${datasource}"
+      },
+      "description": "The data written to the disk in the last 24h period divided by the physical capacity of the disk",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 0,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "auto",
+            "spanNulls": false,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 13,
+        "w": 10,
+        "x": 9,
+        "y": 17
+      },
+      "id": 9,
+      "options": {
+        "legend": {
+          "calcs": [],
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "${datasource}"
+          },
+          "editorMode": "code",
+          "expr": "delta(nvme_data_units_written_total{instance=~\"$node\"}[24h])*512000 / nvme_physical_size_bytes{instance=~\"$node\"}",
+          "legendFormat": "{{instance}} - {{device}}",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "DWPD",
+      "type": "timeseries"
     }
   ],
   "refresh": false,