Documented health endpoint

docs/swagger/swagger.json

@@ -56,6 +56,10 @@
             "name": "Visits",
             "description": "Operations to manage visits on short URLs"
         },
+        {
+            "name": "Monitoring",
+            "description": "Public endpoints designed to monitor the service"
+        },
         {
             "name": "URL Shortener",
             "description": "Non-rest endpoints, used to be publicly exposed"
@@ -88,6 +92,10 @@
             "$ref": "paths/v1_short-urls_{shortCode}_visits.json"
         },
 
+        "/rest/health": {
+            "$ref": "paths/health.json"
+        },
+
         "/{shortCode}": {
             "$ref": "paths/{shortCode}.json"
         },