[ONOS-3601] Bugfix: resolve swagger doc issue of metric REST API

Change-Id: I76f04fbd3e7ed6aa2ab35dcb39bcbeacc9675282
diff --git a/web/api/src/main/resources/definitions/Metrics.json b/web/api/src/main/resources/definitions/Metrics.json
index 552d07d..0d1605a 100644
--- a/web/api/src/main/resources/definitions/Metrics.json
+++ b/web/api/src/main/resources/definitions/Metrics.json
@@ -8,119 +8,26 @@
     "metrics": {
       "type": "array",
       "xml": {
-        "name": "metrics",
+        "name": "metric",
         "wrapped": true
       },
       "items": {
         "type": "object",
         "title": "metric",
         "required": [
-          "name",
           "metric"
         ],
         "properties": {
-          "name": {
-            "type": "string",
-            "example": "cpu"
-          },
           "metric": {
             "type": "object",
+            "title": "property",
             "optional": [
-              "counter",
-              "gauge",
-              "meter",
-              "histogram",
-              "timer"
+              "type"
             ],
             "properties": {
-              "counter": {
-                "type": "object",
-                "required": [
-                  "counter"
-                ],
-                "properties": {
-                  "counter": {
-                    "type": "integer",
-                    "example": "1"
-                  }
-                }
-              },
-              "gauge": {
-                "type": "object",
-                "required": [
-                  "value"
-                ],
-                "properties": {
-                  "value": "string",
-                  "example": "1"
-                }
-              },
-              "meter": {
-                "type": "object",
-                "required": [
-                  "counter",
-                  "mean_rate",
-                  "1_min_rate",
-                  "5_min_rate",
-                  "15_min_rate"
-                ],
-                "properties": {
-                  "counter": {
-                    "type": "integer",
-                    "example": "1"
-                  },
-                  "mean_rate": {
-                    "type": "double",
-                    "example": "1.0"
-                  },
-                  "1_min_rate": {
-                    "type": "double",
-                    "example": "1.0"
-                  },
-                  "5_min_rate": {
-                    "type": "double",
-                    "example": "1.0"
-                  },
-                  "15_min_rate": {
-                    "type": "double",
-                    "example": "1.0"
-                  }
-                }
-              },
-              "histogram": {
-                "type": "object",
-                "required": [
-                  "counter",
-                  "mean",
-                  "min",
-                  "max",
-                  "stddev"
-                ],
-                "properties": {
-                  "counter": {
-                    "type": "integer",
-                    "example": "1"
-                  },
-                  "mean": {
-                    "type": "double",
-                    "example": "1.0"
-                  },
-                  "min": {
-                    "type": "double",
-                    "example": "1.0"
-                  },
-                  "max": {
-                    "type": "double",
-                    "example": "1.0"
-                  },
-                  "stddev": {
-                    "type": "double",
-                    "example": "1.0"
-                  }
-                }
-              },
               "timer": {
                 "type": "object",
+                "title": "timer",
                 "required": [
                   "counter",
                   "mean_rate",