Update monitoring.adoc

Author: mkjsix

docs/monitoring.adoc

@@ -52,13 +52,28 @@ Now, let's proceed by making a few requests to /acme/ping using httpie.
 [source,bash]
 ----
 $ http -b :8080/acme/ping
-Greetings from RESTHeart!
+{
+    "client_ip": "127.0.0.1",
+    "host": "localhost:8080",
+    "message": "Greetings from RESTHeart!",
+    "version": "8.4.0"
+}
 
 $http -b :8080/acme/ping
-Greetings from RESTHeart!
+{
+    "client_ip": "127.0.0.1",
+    "host": "localhost:8080",
+    "message": "Greetings from RESTHeart!",
+    "version": "8.4.0"
+}
 
 $http -b :8080/acme/ping
-Greetings from RESTHeart!
+{
+    "client_ip": "127.0.0.1",
+    "host": "localhost:8080",
+    "message": "Greetings from RESTHeart!",
+    "version": "8.4.0"
+}
 ----
 
 Now we can ask for available metrics: