diff --git a/src/Microsoft.TestPlatform.Client/MultiTestRunFinalization/MultiTestRunFinalizationEventsHandler.cs b/src/Microsoft.TestPlatform.Client/MultiTestRunFinalization/MultiTestRunFinalizationEventsHandler.cs
index e2c59074db..78cc89e1be 100644
--- a/src/Microsoft.TestPlatform.Client/MultiTestRunFinalization/MultiTestRunFinalizationEventsHandler.cs
+++ b/src/Microsoft.TestPlatform.Client/MultiTestRunFinalization/MultiTestRunFinalizationEventsHandler.cs
@@ -16,8 +16,6 @@ namespace Microsoft.VisualStudio.TestPlatform.Client.MultiTestRunFinalization
     public class MultiTestRunFinalizationEventsHandler : IMultiTestRunFinalizationEventsHandler
     {
         private readonly ICommunicationManager communicationManager;
-        private bool finalizationCompleteSent;
-        private readonly object syncObject = new object();
 
         /// <summary>
         /// Initializes a new instance of the <see cref="MultiTestRunFinalizationEventsHandler"/> class.
@@ -41,26 +39,18 @@ public void HandleLogMessage(TestMessageLevel level, string message)
 
         public void HandleMultiTestRunFinalizationComplete(ICollection<AttachmentSet> attachments)
         {
-            lock(this.syncObject)
+            if (EqtTrace.IsInfoEnabled)
             {
-                if(!finalizationCompleteSent)
-                {
-                    if (EqtTrace.IsInfoEnabled)
-                    {
-                        EqtTrace.Info("Multi test run finalization completed.");
-                    }
-
-                    var payload = new MultiTestRunFinalizationCompletePayload()
-                    {
-                        Attachments = attachments
-                    };
+                EqtTrace.Info("Multi test run finalization completed.");
+            }
 
-                    // Send run complete to translation layer
-                    this.communicationManager.SendMessage(MessageType.MultiTestRunFinalizationComplete, payload);
+            var payload = new MultiTestRunFinalizationCompletePayload()
+            {
+                Attachments = attachments
+            };
 
-                    finalizationCompleteSent = true;
-                }
-            }
+            // Send run complete to translation layer
+            this.communicationManager.SendMessage(MessageType.MultiTestRunFinalizationComplete, payload);
         }
 
         public void HandleRawMessage(string rawMessage)
diff --git a/src/Microsoft.TestPlatform.CoreUtilities/Tracing/Interfaces/ITestPlatformEventSource.cs b/src/Microsoft.TestPlatform.CoreUtilities/Tracing/Interfaces/ITestPlatformEventSource.cs
index 41a0d7b7ce..a287b0cf6d 100644
--- a/src/Microsoft.TestPlatform.CoreUtilities/Tracing/Interfaces/ITestPlatformEventSource.cs
+++ b/src/Microsoft.TestPlatform.CoreUtilities/Tracing/Interfaces/ITestPlatformEventSource.cs
@@ -194,25 +194,12 @@ public interface ITestPlatformEventSource
         void MultiTestRunFinalizationRequestStop();
 
         /// <summary>
-        /// The adapter multi test run finalization start.
-        /// </summary>
-        /// <param name="numberOfAttachements">
-        /// The number of attachements.
-        /// </param>
-        void AdapterMultiTestRunFinalizationStart(long numberOfAttachements);
-
-        /// <summary>
-        /// The adapter multi test run finalization stop.
+        /// The multi test run finalization start.
         /// </summary>
         /// <param name="numberOfAttachements">
         /// The number of attachements.
         /// </param>
-        void AdapterMultiTestRunFinalizationStop(long numberOfAttachements);
-
-        /// <summary>
-        /// The multi test run finalization start.
-        /// </summary>
-        void MultiTestRunFinalizationStart();
+        void MultiTestRunFinalizationStart(long numberOfAttachements);
 
         /// <summary>
         /// The multi test run finalization stop.
diff --git a/src/Microsoft.TestPlatform.CoreUtilities/Tracing/TestPlatformEventSource.cs b/src/Microsoft.TestPlatform.CoreUtilities/Tracing/TestPlatformEventSource.cs
index 7a615cf53e..7cda495578 100644
--- a/src/Microsoft.TestPlatform.CoreUtilities/Tracing/TestPlatformEventSource.cs
+++ b/src/Microsoft.TestPlatform.CoreUtilities/Tracing/TestPlatformEventSource.cs
@@ -252,25 +252,11 @@ public void MultiTestRunFinalizationRequestStop()
             this.WriteEvent(TestPlatformInstrumentationEvents.MultiTestRunFinalizationRequestStopEventId);
         }
 
-        /// <inheritdoc/>
-        [Event(TestPlatformInstrumentationEvents.AdapterMultiTestRunFinalizationStartEventId)]
-        public void AdapterMultiTestRunFinalizationStart(long numberOfAttachements)
-        {
-            this.WriteEvent(TestPlatformInstrumentationEvents.AdapterMultiTestRunFinalizationStartEventId, numberOfAttachements);
-        }
-
-        /// <inheritdoc/>
-        [Event(TestPlatformInstrumentationEvents.AdapterMultiTestRunFinalizationStopEventId)]
-        public void AdapterMultiTestRunFinalizationStop(long numberOfAttachements)
-        {
-            this.WriteEvent(TestPlatformInstrumentationEvents.AdapterMultiTestRunFinalizationStopEventId, numberOfAttachements);
-        }
-
         /// <inheritdoc/>
         [Event(TestPlatformInstrumentationEvents.MultiTestRunFinalizationStartEventId)]
-        public void MultiTestRunFinalizationStart()
+        public void MultiTestRunFinalizationStart(long numberOfAttachements)
         {
-            this.WriteEvent(TestPlatformInstrumentationEvents.MultiTestRunFinalizationStartEventId);
+            this.WriteEvent(TestPlatformInstrumentationEvents.MultiTestRunFinalizationStartEventId, numberOfAttachements);
         }
 
         /// <inheritdoc/>
diff --git a/src/Microsoft.TestPlatform.CoreUtilities/Tracing/TestPlatformInstrumentationEvents.cs b/src/Microsoft.TestPlatform.CoreUtilities/Tracing/TestPlatformInstrumentationEvents.cs
index 498eb86b25..2fa7f1e87a 100644
--- a/src/Microsoft.TestPlatform.CoreUtilities/Tracing/TestPlatformInstrumentationEvents.cs
+++ b/src/Microsoft.TestPlatform.CoreUtilities/Tracing/TestPlatformInstrumentationEvents.cs
@@ -178,24 +178,14 @@ internal class TestPlatformInstrumentationEvents
         /// </summary>
         public const int MultiTestRunFinalizationRequestStopEventId = 0x43;
 
-        /// <summary>
-        /// The adapter session finalization start event id.
-        /// </summary>
-        public const int AdapterMultiTestRunFinalizationStartEventId = 0x44;
-
-        /// <summary>
-        /// The adapter session finalization stop event id.
-        /// </summary>
-        public const int AdapterMultiTestRunFinalizationStopEventId = 0x45;
-
         /// <summary>
         /// Events fired on session finalization start of translation layer.
         /// </summary>
-        public const int TranslationLayerMultiTestRunFinalizationStartEventId = 0x46;
+        public const int TranslationLayerMultiTestRunFinalizationStartEventId = 0x44;
 
         /// <summary>
         /// Events fired on session finalization complete in translation layer.
         /// </summary>
-        public const int TranslationLayerMultiTestRunFinalizationStopEventId = 0x47;
+        public const int TranslationLayerMultiTestRunFinalizationStopEventId = 0x45;
     }
 }
\ No newline at end of file
diff --git a/src/Microsoft.TestPlatform.CrossPlatEngine/DataCollection/DataCollectorAttachmentsHandler.cs b/src/Microsoft.TestPlatform.CrossPlatEngine/DataCollection/DataCollectorAttachmentsHandler.cs
index 40037744b1..639bd48ef9 100644
--- a/src/Microsoft.TestPlatform.CrossPlatEngine/DataCollection/DataCollectorAttachmentsHandler.cs
+++ b/src/Microsoft.TestPlatform.CrossPlatEngine/DataCollection/DataCollectorAttachmentsHandler.cs
@@ -27,15 +27,15 @@ public void HandleAttachements(ICollection<AttachmentSet> attachments, Cancellat
                 Uri attachementUri = dataCollectorAttachmentsHandler.GetExtensionUri();
                 if (attachementUri != null)
                 {
-                    var coverageAttachments = attachments.Where(dataCollectionAttachment => attachementUri.Equals(dataCollectionAttachment.Uri)).ToArray();
+                    var attachmentsToBeProcessed = attachments.Where(dataCollectionAttachment => attachementUri.Equals(dataCollectionAttachment.Uri)).ToArray();
 
-                    foreach (var coverageAttachment in coverageAttachments)
+                    foreach (var attachment in attachmentsToBeProcessed)
                     {
-                        attachments.Remove(coverageAttachment);
+                        attachments.Remove(attachment);
                     }
 
-                    ICollection<AttachmentSet> mergedAttachments = dataCollectorAttachmentsHandler.HandleDataCollectionAttachmentSets(new Collection<AttachmentSet>(coverageAttachments), cancellationToken);
-                    foreach (var attachment in mergedAttachments)
+                    ICollection<AttachmentSet> processedAttachements = dataCollectorAttachmentsHandler.HandleDataCollectionAttachmentSets(new Collection<AttachmentSet>(attachmentsToBeProcessed), cancellationToken);
+                    foreach (var attachment in processedAttachements)
                     {
                         attachments.Add(attachment);
                     }
diff --git a/src/Microsoft.TestPlatform.CrossPlatEngine/MultiTestRunFinalization/MultiTestRunFinalizationManager.cs b/src/Microsoft.TestPlatform.CrossPlatEngine/MultiTestRunFinalization/MultiTestRunFinalizationManager.cs
index 398ef08071..baf4626add 100644
--- a/src/Microsoft.TestPlatform.CrossPlatEngine/MultiTestRunFinalization/MultiTestRunFinalizationManager.cs
+++ b/src/Microsoft.TestPlatform.CrossPlatEngine/MultiTestRunFinalization/MultiTestRunFinalizationManager.cs
@@ -5,6 +5,7 @@
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestPlatform.CoreUtilities.Tracing.Interfaces;
 using Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.DataCollection;
 using Microsoft.VisualStudio.TestPlatform.ObjectModel;
 using Microsoft.VisualStudio.TestPlatform.ObjectModel.Client;
@@ -18,13 +19,15 @@ namespace Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.MultiTestRunFinali
     public class MultiTestRunFinalizationManager : IMultiTestRunFinalizationManager
     {
         private readonly DataCollectorAttachmentsHandler attachmentsHandler;
+        private readonly ITestPlatformEventSource testPlatformEventSource;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="MultiTestRunFinalizationManager"/> class.
         /// </summary>
-        public MultiTestRunFinalizationManager(DataCollectorAttachmentsHandler attachmentsHandler)
+        public MultiTestRunFinalizationManager(DataCollectorAttachmentsHandler attachmentsHandler, ITestPlatformEventSource testPlatformEventSource)
         {
-            this.attachmentsHandler = attachmentsHandler;
+            this.attachmentsHandler = attachmentsHandler ?? throw new ArgumentNullException(nameof(attachmentsHandler));
+            this.testPlatformEventSource = testPlatformEventSource ?? throw new ArgumentNullException(nameof(testPlatformEventSource));
         }
 
         /// <summary>
@@ -39,6 +42,8 @@ public async Task FinalizeMultiTestRunAsync(ICollection<AttachmentSet> attachmen
             {
                 cancellationToken.ThrowIfCancellationRequested();
 
+                testPlatformEventSource.MultiTestRunFinalizationStart(attachments.Count);
+
                 var taskCompletionSource = new TaskCompletionSource<object>();
                 cancellationToken.Register(() =>
                 {
@@ -47,15 +52,20 @@ public async Task FinalizeMultiTestRunAsync(ICollection<AttachmentSet> attachmen
 
                 Task task = Task.Run(() =>
                 {
-                    attachmentsHandler.HandleAttachements(attachments, cancellationToken);
-                    eventHandler.HandleMultiTestRunFinalizationComplete(attachments);
+                    attachmentsHandler.HandleAttachements(attachments, cancellationToken);                    
                 });
 
                 var completedTask = await Task.WhenAny(task, taskCompletionSource.Task);
 
-                if (completedTask != task)
+                if (completedTask == task)
+                {
+                    eventHandler.HandleMultiTestRunFinalizationComplete(attachments);
+                    testPlatformEventSource.MultiTestRunFinalizationStop(attachments.Count);
+                }
+                else
                 {
                     eventHandler.HandleMultiTestRunFinalizationComplete(null);
+                    testPlatformEventSource.MultiTestRunFinalizationStop(0);
                 }
             }
             catch (Exception e)
@@ -64,6 +74,7 @@ public async Task FinalizeMultiTestRunAsync(ICollection<AttachmentSet> attachmen
 
                 eventHandler.HandleLogMessage(ObjectModel.Logging.TestMessageLevel.Error, e.Message);
                 eventHandler.HandleMultiTestRunFinalizationComplete(null);
+                testPlatformEventSource.MultiTestRunFinalizationStop(0);
             }
 
         }
diff --git a/src/Microsoft.TestPlatform.VsTestConsole.TranslationLayer/VsTestConsoleRequestSender.cs b/src/Microsoft.TestPlatform.VsTestConsole.TranslationLayer/VsTestConsoleRequestSender.cs
index e4532e2191..beb8efce4e 100644
--- a/src/Microsoft.TestPlatform.VsTestConsole.TranslationLayer/VsTestConsoleRequestSender.cs
+++ b/src/Microsoft.TestPlatform.VsTestConsole.TranslationLayer/VsTestConsoleRequestSender.cs
@@ -386,7 +386,7 @@ public void EndSession()
         /// <inheritdoc/>
         public void FinalizeMultiTestRun(ICollection<AttachmentSet> attachments, IMultiTestRunFinalizationEventsHandler testSessionEventsHandler)
         {
-            this.SendMessageAndListenAndReportAttachements(attachments, testSessionEventsHandler);
+            this.SendMessageAndListenAndReportAttachments(attachments, testSessionEventsHandler);
         }
 
         /// <inheritdoc/>
@@ -741,7 +741,7 @@ private async Task SendMessageAndListenAndReportTestResultsAsync(string messageT
             this.testPlatformEventSource.TranslationLayerExecutionStop();
         }
 
-        private void SendMessageAndListenAndReportAttachements(ICollection<AttachmentSet> attachments, IMultiTestRunFinalizationEventsHandler eventHandler)
+        private void SendMessageAndListenAndReportAttachments(ICollection<AttachmentSet> attachments, IMultiTestRunFinalizationEventsHandler eventHandler)
         {
             try
             {
diff --git a/src/vstest.console/TestPlatformHelpers/TestRequestManager.cs b/src/vstest.console/TestPlatformHelpers/TestRequestManager.cs
index 0bcd0337d6..5f57eeb7ca 100644
--- a/src/vstest.console/TestPlatformHelpers/TestRequestManager.cs
+++ b/src/vstest.console/TestPlatformHelpers/TestRequestManager.cs
@@ -84,7 +84,7 @@ public TestRequestManager()
                   new InferHelper(AssemblyMetadataProvider.Instance),
                   MetricsPublisherFactory.GetMetricsPublisher(IsTelemetryOptedIn(), CommandLineOptions.Instance.IsDesignMode),
                   new ProcessHelper(),
-                  new MultiTestRunFinalizationManager(new CrossPlatEngine.DataCollection.DataCollectorAttachmentsHandler(new CodeCoverageDataAttachmentsHandler())))
+                  new MultiTestRunFinalizationManager(new CrossPlatEngine.DataCollection.DataCollectorAttachmentsHandler(new CodeCoverageDataAttachmentsHandler()), TestPlatformEventSource.Instance))
         {
         }