Add telemetry to toggle block comment.

src/EditorFeatures/Core/Implementation/CommentSelection/AbstractToggleBlockCommentBase.cs

@@ -9,6 +9,7 @@
 using Microsoft.CodeAnalysis.CommentSelection;
 using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
 using Microsoft.CodeAnalysis.Experiments;
+using Microsoft.CodeAnalysis.Internal.Log;
 using Microsoft.CodeAnalysis.PooledObjects;
 using Microsoft.CodeAnalysis.Shared.Extensions;
 using Microsoft.CodeAnalysis.Text;
@@ -30,6 +31,9 @@ internal abstract class AbstractToggleBlockCommentBase :
         private static readonly CommentSelectionResult s_emptyCommentSelectionResult =
             new CommentSelectionResult(new List<TextChange>(), new List<CommentTrackingSpan>(), Operation.Uncomment);
 
+        private const string ContentTypeString = "ContentType";
+        private const string SubjectBufferLengthString = "subjectBufferLength";
+
         private readonly ITextStructureNavigatorSelectorService _navigatorSelectorService;
 
         internal AbstractToggleBlockCommentBase(
@@ -83,21 +87,28 @@ public bool ExecuteCommand(ToggleBlockCommentCommandArgs args, CommandExecutionC
         internal async override Task<CommentSelectionResult> CollectEditsAsync(Document document, ICommentSelectionService service,
             ITextBuffer subjectBuffer, NormalizedSnapshotSpanCollection selectedSpans, ValueTuple command, CancellationToken cancellationToken)
         {
-            var experimentationService = document.Project.Solution.Workspace.Services.GetRequiredService<IExperimentationService>();
-            if (!experimentationService.IsExperimentEnabled(WellKnownExperimentNames.RoslynToggleBlockComment))
+            using (Logger.LogBlock(FunctionId.CommandHandler_ToggleBlockComment, KeyValueLogMessage.Create(LogType.UserAction, m =>
             {
-                return s_emptyCommentSelectionResult;
-            }
+                m[ContentTypeString] = subjectBuffer.ContentType.DisplayName;
+                m[SubjectBufferLengthString] = subjectBuffer.CurrentSnapshot.Length;
+            }), cancellationToken))
+            {
+                var experimentationService = document.Project.Solution.Workspace.Services.GetRequiredService<IExperimentationService>();
+                if (!experimentationService.IsExperimentEnabled(WellKnownExperimentNames.RoslynToggleBlockComment))
+                {
+                    return s_emptyCommentSelectionResult;
+                }
 
-            var navigator = _navigatorSelectorService.GetTextStructureNavigator(subjectBuffer);
+                var navigator = _navigatorSelectorService.GetTextStructureNavigator(subjectBuffer);
 
-            var commentInfo = await service.GetInfoAsync(document, selectedSpans.First().Span.ToTextSpan(), cancellationToken).ConfigureAwait(false);
-            if (commentInfo.SupportsBlockComment)
-            {
-                return await ToggleBlockCommentsAsync(document, commentInfo, navigator, selectedSpans, cancellationToken).ConfigureAwait(false);
-            }
+                var commentInfo = await service.GetInfoAsync(document, selectedSpans.First().Span.ToTextSpan(), cancellationToken).ConfigureAwait(false);
+                if (commentInfo.SupportsBlockComment)
+                {
+                    return await ToggleBlockCommentsAsync(document, commentInfo, navigator, selectedSpans, cancellationToken).ConfigureAwait(false);
+                }
 
-            return s_emptyCommentSelectionResult;
+                return s_emptyCommentSelectionResult;
+            }
         }
 
         private async Task<CommentSelectionResult> ToggleBlockCommentsAsync(Document document, CommentSelectionInfo commentInfo,

src/Workspaces/Core/Portable/Log/FunctionId.cs

@@ -61,6 +61,7 @@ internal enum FunctionId
         CommandHandler_GetCommandState,
         CommandHandler_ExecuteHandlers,
         CommandHandler_FormatCommand,
+        CommandHandler_ToggleBlockComment,
 
         Workspace_SourceText_GetChangeRanges,
         Workspace_Recoverable_RecoverRootAsync,