Merge pull request #812 from glucaci/fixExecutePhaseSample

Fix execute workflow phase sample

Author: danielgerlag

ReleaseNotes/3.4.0.md

@@ -38,18 +38,27 @@ public class MetricsMiddleware : IWorkflowMiddleware
         switch (workflow.Status)
         {
             case WorkflowStatus.Complete:
-                if (_suspendedWorkflows.TryRemove(workflow.Id))
-                {
-                    _suspended.Dec();
-                }
+                TryDecrementSuspended(workflow);
                 _completed.Inc();
                 break;
             case WorkflowStatus.Suspended:
+                _suspendedWorkflows.Add(workflow.Id);
                 _suspended.Inc();
                 break;
+            default:
+                TryDecrementSuspended(workflow);
+                break;
         }
 
         return next();
     }
+
+    private void TryDecrementSuspended(WorkflowInstance workflow)
+    {
+        if (_suspendedWorkflows.TryRemove(workflow.Id))
+        {
+            _suspended.Dec();
+        }
+    }
 }
 ```