Add new panel for Per OSD Usage in OSD dashboard

Adds a new panel to the OSD dashboard that shows the per OSD usage
as well as the bluestoreDB usage as histograms.

Author: technowhizz

etc/kayobe/kolla/config/grafana/dashboards/ceph/ceph_osds.json

@@ -884,6 +884,150 @@
         "align": false
       }
     },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${datasource}"
+      },
+      "description": "Number of OSDs",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "custom": {
+            "fillOpacity": 84,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineWidth": 1
+          },
+          "displayName": "${__field.labels.ceph_daemon}",
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "percentunit"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 16
+      },
+      "id": 21,
+      "options": {
+        "combine": true,
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "list",
+          "placement": "right",
+          "showLegend": false
+        }
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "PBFA97CFB590B2093"
+          },
+          "editorMode": "code",
+          "expr": "ceph_osd_stat_bytes_used / ceph_osd_stat_bytes",
+          "instant": true,
+          "legendFormat": "__auto",
+          "range": false,
+          "refId": "A"
+        }
+      ],
+      "title": "Per OSD Space Used",
+      "type": "histogram"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "${datasource}"
+      },
+      "description": "Number of BluestoreDB's",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds",
+            "seriesBy": "last"
+          },
+          "custom": {
+            "fillOpacity": 84,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineWidth": 1
+          },
+          "displayName": "${__field.labels.ceph_daemon}",
+          "fieldMinMax": false,
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "percentunit"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 16
+      },
+      "id": 24,
+      "options": {
+        "combine": true,
+        "legend": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "displayMode": "list",
+          "placement": "right",
+          "showLegend": false
+        }
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "PBFA97CFB590B2093"
+          },
+          "editorMode": "code",
+          "expr": "ceph_bluefs_db_used_bytes / ceph_bluefs_db_total_bytes ",
+          "instant": true,
+          "legendFormat": "__auto",
+          "range": false,
+          "refId": "A"
+        }
+      ],
+      "title": "BluestoreDB Space Used",
+      "type": "histogram"
+    },
     {
       "collapsed": false,
       "datasource": {
@@ -894,7 +1038,7 @@
         "h": 1,
         "w": 24,
         "x": 0,
-        "y": 16
+        "y": 17
       },
       "id": 20,
       "panels": [],
@@ -931,7 +1075,7 @@
         "h": 8,
         "w": 24,
         "x": 0,
-        "y": 17
+        "y": 18
       },
       "hiddenSeries": false,
       "id": 10,