Add support for Y axis labels

Change-Id: I42ff3fa12fbb792b2544e0697c3ab87b0768e82d

grafana_dashboards/schema/panel/graph.py

@@ -33,6 +33,8 @@ class Graph(Base):
             v.Required('targets', default=[]): v.All(list),
             v.Required('x-axis', default=True): v.All(bool),
             v.Required('y-axis', default=True): v.All(bool),
+            v.Optional('leftYAxisLabel'): v.All(str, v.Length(min=1)),
+            v.Optional('rightYAxisLabel'): v.All(str, v.Length(min=1)),
         }
         graph.update(self.base)
         return v.Schema(graph)

tests/schema/fixtures/dashboard-0009.json

@@ -0,0 +1,40 @@
+{
+    "dashboard": {
+        "new-dashboard": {
+            "rows": [
+                {
+                    "collapse": false,
+                    "editable": true,
+                    "height": "250px",
+                    "panels": [
+                        {
+                            "bars": false,
+                            "editable": true,
+                            "error": false,
+                            "fill": 1,
+                            "leftYAxisLabel": "left label",
+                            "lines": true,
+                            "linewidth": 2,
+                            "percentage": false,
+                            "pointradius": 5,
+                            "points": false,
+                            "rightYAxisLabel": "right label",
+                            "span": 12,
+                            "stack": false,
+                            "steppedLine": false,
+                            "targets": [],
+                            "title": "no title (click here)",
+                            "type": "graph",
+                            "x-axis": true,
+                            "y-axis": true
+                        }
+                    ],
+                    "showTitle": false,
+                    "title": "New row"
+                }
+            ],
+            "timezone": "utc",
+            "title": "New dashboard"
+        }
+    }
+}

tests/schema/fixtures/dashboard-0009.yaml

@@ -0,0 +1,10 @@
+dashboard:
+  title: New dashboard
+  rows:
+    - title: New row
+      height: 250px
+      panels:
+          - title: no title (click here)
+            type: graph
+            leftYAxisLabel: left label
+            rightYAxisLabel: right label