diff --git a/Src/Workspaces/Core/Log/ITelemetry.cs b/Src/Workspaces/Core/Log/ITelemetry.cs
index 866d23ff76afd63380d105e914c84311bec996ba..d8c97e087db56dc76f71c149b8d25b3b0fcf158e 100644
--- a/Src/Workspaces/Core/Log/ITelemetry.cs
+++ b/Src/Workspaces/Core/Log/ITelemetry.cs
@@ -13,5 +13,6 @@ internal interface ITelemetryService : IWorkspaceService
         void EndCurrentSession();
         void LogRenameSession(RenameSessionInfo renameSession);
         void LogLightBulbSession(LightBulbSessionInfo lightBulbSession);
+        void LogEncDebugSession(EncDebuggingSessionInfo session);
     }
 }
diff --git a/Src/Workspaces/Core/Log/Telemetry.Parameters.cs b/Src/Workspaces/Core/Log/Telemetry.Parameters.cs
index 2b61655042418b72543f34463870b54dd6b38d24..559eebff3f9ff84e6bd60422b82758601b2bc866 100644
--- a/Src/Workspaces/Core/Log/Telemetry.Parameters.cs
+++ b/Src/Workspaces/Core/Log/Telemetry.Parameters.cs
@@ -1,10 +1,9 @@
 // Copyright (c) Microsoft Open Technologies, Inc.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 
 using System;
-using System.Diagnostics.CodeAnalysis;
-using System.Linq;
-using System.Threading;
+using System.Collections.Generic;
 using Microsoft.CodeAnalysis.Options;
+using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.Internal.Log.Telemetry
 {
@@ -86,4 +85,42 @@ internal struct LightBulbSessionInfo
             this.ExtendedFlagsOfSelectedItem = extendedFlagsOfSelectedItem;
         }
     }
+
+    internal class EncDebuggingSessionInfo
+    {
+        public readonly List<EncEditSessionInfo> EditSessions = new List<EncEditSessionInfo>();
+        public int EmptyEditSessions = 0;
+
+        internal void EndEditSession(EncEditSessionInfo encEditSessionInfo)
+        {
+            if (encEditSessionInfo.IsEmpty())
+            {
+                EmptyEditSessions++;
+            }
+            else
+            {
+                EditSessions.Add(encEditSessionInfo);
+            }
+        }
+    }
+
+    internal class EncEditSessionInfo
+    {
+        public readonly HashSet<ValueTuple<ushort, ushort>> RudeEdits = new HashSet<ValueTuple<ushort, ushort>>();
+        public IEnumerable<string> EmitDeltaErrorIds;
+        public bool HadCompilationErrors;
+        public bool HadRudeEdits;
+        public bool HadValidChanges;
+        public bool HadValidInsignificantChanges;
+
+        internal void LogRudeEdit(ushort kind, ushort syntaxKind)
+        {
+            RudeEdits.Add(ValueTuple.Create(kind, syntaxKind));
+        }
+
+        internal bool IsEmpty()
+        {
+            return !(HadCompilationErrors || HadRudeEdits || HadValidChanges || HadValidInsignificantChanges);
+        }
+    }
 }
diff --git a/Src/Workspaces/Core/Log/TelemetryWorkspaceServiceFactory.cs b/Src/Workspaces/Core/Log/TelemetryWorkspaceServiceFactory.cs
index 7187ab844e2413682d8d9af28e8c24238d75b34c..1afffa0dfeea1b4673094c00487bf8f5af734b0a 100644
--- a/Src/Workspaces/Core/Log/TelemetryWorkspaceServiceFactory.cs
+++ b/Src/Workspaces/Core/Log/TelemetryWorkspaceServiceFactory.cs
@@ -19,7 +19,7 @@ private class EmptyTelemetryLogger : ITelemetryService
             void ITelemetryService.EndCurrentSession()
             {
             }
-
+            
             void ITelemetryService.LogLightBulbSession(Telemetry.LightBulbSessionInfo lightBulbSession)
             {
             }
@@ -27,6 +27,10 @@ void ITelemetryService.LogLightBulbSession(Telemetry.LightBulbSessionInfo lightB
             void ITelemetryService.LogRenameSession(Telemetry.RenameSessionInfo renameSession)
             {
             }
+
+            void ITelemetryService.LogEncDebugSession(Telemetry.EncDebuggingSessionInfo session)
+            {
+            }
         }
     }
 }
diff --git a/Src/Workspaces/Core/Workspaces.csproj b/Src/Workspaces/Core/Workspaces.csproj
index 3dac85da498b161d6f265e7605a0929c7461d0b4..d15e0f3dc60be9484dc0c1d7053b39aeea33db6e 100644
--- a/Src/Workspaces/Core/Workspaces.csproj
+++ b/Src/Workspaces/Core/Workspaces.csproj
@@ -522,7 +522,9 @@
     <Compile Include="Log\ITelemetry.cs" />
     <Compile Include="Log\Logger.cs" />
     <Compile Include="Log\RoslynEventSource.cs" />
-    <Compile Include="Log\Telemetry.Parameters.cs" />
+    <Compile Include="Log\Telemetry.Parameters.cs">
+      <ExcludeFromStyleCop>true</ExcludeFromStyleCop>
+    </Compile>
     <Compile Include="Log\TelemetryWorkspaceServiceFactory.cs" />
     <Compile Include="Log\TraceLogger.cs" />
     <Compile Include="Notification\AbstractGlobalOperationNotificationService.cs" />