Add stats for service endpoints using existing data.

For each service endpoint (e.g. posts to the xinventory service), a stat is available which shows the number of requests received and moving average per second
The full name is "service.<http-method>:<path>.requests (e.g. service.POST:/xinventory.requests)

OpenSim/Framework/Servers/HttpServer/BaseRequestHandler.cs

@@ -26,6 +26,7 @@
  */
 
 using System;
+using OpenSim.Framework.Monitoring;
 
 namespace OpenSim.Framework.Servers.HttpServer
 {
@@ -61,6 +62,19 @@ namespace OpenSim.Framework.Servers.HttpServer
             Description = description;
             m_httpMethod = httpMethod;
             m_path = path;
+
+            StatsManager.RegisterStat(
+                new Stat(
+                "requests", 
+                "requests", 
+                "Number of requests received by this service endpoint", 
+                "requests", 
+                "service", 
+                string.Format("{0}:{1}", httpMethod, path), 
+                StatType.Pull, 
+                MeasuresOfInterest.AverageChangeOverTime,
+                s => s.Value = RequestsReceived,
+                StatVerbosity.Debug));
         }
 
         public virtual string Path