[#38] grafana: Add epoch dashboard

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

services/grafana/provisioning/dashboards/storage-node.json

@@ -32,7 +32,7 @@
       },
       "id": 22,
       "panels": [],
-      "title": "Health",
+      "title": "General",
       "type": "row"
     },
     {
@@ -121,7 +121,7 @@
       },
       "gridPos": {
         "h": 6,
-        "w": 24,
+        "w": 12,
         "x": 0,
         "y": 1
       },
@@ -160,6 +160,72 @@
       "transformations": [],
       "type": "timeseries"
     },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "PBFA97CFB590B2093"
+      },
+      "description": "Current epoch on the instance",
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "fixedColor": "green",
+            "mode": "fixed"
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          },
+          "unit": "none"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 6,
+        "w": 12,
+        "x": 12,
+        "y": 1
+      },
+      "id": 32,
+      "options": {
+        "orientation": "auto",
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ],
+          "fields": "",
+          "values": false
+        },
+        "showThresholdLabels": false,
+        "showThresholdMarkers": true
+      },
+      "pluginVersion": "9.5.6",
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "PBFA97CFB590B2093"
+          },
+          "editorMode": "code",
+          "expr": "frostfs_node_ir_epoch{job=\"node\", instance=\"$instance\"}",
+          "legendFormat": "__auto",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Epoch",
+      "type": "gauge"
+    },
     {
       "collapsed": false,
       "gridPos": {
@@ -577,7 +643,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 32
+            "y": 40
           },
           "id": 8,
           "options": {
@@ -677,7 +743,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 42
+            "y": 50
           },
           "id": 9,
           "options": {
@@ -776,7 +842,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 52
+            "y": 60
           },
           "id": 10,
           "options": {
@@ -875,7 +941,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 62
+            "y": 70
           },
           "id": 7,
           "options": {
@@ -1008,7 +1074,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 72
+            "y": 80
           },
           "id": 11,
           "options": {
@@ -1125,7 +1191,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 40
+            "y": 48
           },
           "id": 13,
           "options": {
@@ -1226,7 +1292,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 50
+            "y": 58
           },
           "id": 15,
           "options": {
@@ -1326,7 +1392,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 60
+            "y": 68
           },
           "id": 14,
           "options": {
@@ -1426,7 +1492,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 70
+            "y": 78
           },
           "id": 16,
           "options": {
@@ -1526,7 +1592,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 80
+            "y": 88
           },
           "id": 17,
           "options": {
@@ -1626,7 +1692,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 90
+            "y": 98
           },
           "id": 18,
           "options": {
@@ -1728,7 +1794,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 100
+            "y": 108
           },
           "id": 19,
           "options": {
@@ -1842,7 +1908,7 @@
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             "w": 24,
             "x": 0,
-            "y": 75
+            "y": 83
           },
           "id": 24,
           "options": {
@@ -1942,7 +2008,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 85
+            "y": 93
           },
           "id": 25,
           "options": {
@@ -2042,7 +2108,7 @@
             "h": 10,
             "w": 24,
             "x": 0,
-            "y": 95
+            "y": 103
           },
           "id": 26,
           "options": {
@@ -2159,7 +2225,7 @@
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             "w": 24,
             "x": 0,
-            "y": 112
+            "y": 120
           },
           "id": 28,
           "options": {
@@ -2260,7 +2326,7 @@
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             "w": 24,
             "x": 0,
-            "y": 122
+            "y": 130
           },
           "id": 29,
           "options": {
@@ -2360,7 +2426,7 @@
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             "x": 0,
-            "y": 132
+            "y": 140
           },
           "id": 30,
           "options": {
@@ -2463,7 +2529,7 @@
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             "w": 24,
             "x": 0,
-            "y": 142
+            "y": 150
           },
           "id": 31,
           "options": {