Add globalJson property for global.json state to toplevelparser/command event

src/Cli/dotnet/Program.cs

@@ -230,7 +230,18 @@ internal static int ProcessArgs(string[] args, TimeSpan startupTime)
         }
         PerformanceLogEventSource.Log.TelemetrySaveIfEnabledStart();
         performanceData.Add("Startup Time", startupTime.TotalMilliseconds);
-        TelemetryEventEntry.SendFiltered(Tuple.Create(parseResult, performanceData));
+
+        string globalJsonState = string.Empty;
+        if (TelemetryClient.Enabled)
+        {
+            // Get the global.json state to report in telemetry along with this command invocation.
+            // We don't care about the actual SDK resolution, just the global.json information,
+            // so just pass empty string as executable directory for resolution.
+            NativeWrapper.SdkResolutionResult result = NativeWrapper.NETCoreSdkResolverNativeWrapper.ResolveSdk(string.Empty, Environment.CurrentDirectory);
+            globalJsonState = result.GlobalJsonState;
+        }
+
+        TelemetryEventEntry.SendFiltered(Tuple.Create(parseResult, performanceData, globalJsonState));
         PerformanceLogEventSource.Log.TelemetrySaveIfEnabledStop();
 
         int exitCode;

src/Cli/dotnet/Telemetry/TelemetryFilter.cs

@@ -26,24 +26,40 @@ public IEnumerable<ApplicationInsightsEntryFormat> Filter(object objectToFilter)
     {
         var result = new List<ApplicationInsightsEntryFormat>();
         Dictionary<string, double> measurements = null;
+        string globalJsonState = string.Empty;
         if (objectToFilter is Tuple<ParseResult, Dictionary<string, double>> parseResultWithMeasurements)
         {
             objectToFilter = parseResultWithMeasurements.Item1;
             measurements = parseResultWithMeasurements.Item2;
             measurements = RemoveZeroTimes(measurements);
         }
+        else if (objectToFilter is Tuple<ParseResult, Dictionary<string, double>, string> parseResultWithMeasurementsAndGlobalJsonState)
+        {
+            objectToFilter = parseResultWithMeasurementsAndGlobalJsonState.Item1;
+            measurements = parseResultWithMeasurementsAndGlobalJsonState.Item2;
+            measurements = RemoveZeroTimes(measurements);
+            globalJsonState = parseResultWithMeasurementsAndGlobalJsonState.Item3;
+        }
 
         if (objectToFilter is ParseResult parseResult)
         {
             var topLevelCommandName = parseResult.RootSubCommandResult();
             if (topLevelCommandName != null)
             {
+                Dictionary<string, string> properties = new()
+                {
+                    ["verb"] = topLevelCommandName
+                };
+                if (!string.IsNullOrEmpty(globalJsonState))
+                {
+                    properties["globalJson"] = globalJsonState;
+                }
+
                 result.Add(new ApplicationInsightsEntryFormat(
                     "toplevelparser/command",
-                    new Dictionary<string, string>()
-                    {{ "verb", topLevelCommandName }}
-                    , measurements
-                    ));
+                    properties,
+                    measurements
+                ));
 
                 LogVerbosityForAllTopLevelCommand(result, parseResult, topLevelCommandName, measurements);
 

src/Resolvers/Microsoft.DotNet.NativeWrapper/Interop.cs

@@ -80,6 +80,7 @@ internal enum hostfxr_resolve_sdk2_result_key_t : int
             resolved_sdk_dir = 0,
             global_json_path = 1,
             requested_version = 2,
+            global_json_state = 3,
         }
 
         [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]

src/Resolvers/Microsoft.DotNet.NativeWrapper/SdkResolutionResult.cs

@@ -20,6 +20,11 @@ public class SdkResolutionResult
         /// </summary>
         public string? RequestedVersion;
 
+        /// <summary>
+        /// Result of the global.json search
+        /// </summary>
+        public string? GlobalJsonState;
+
         /// <summary>
         /// True if a global.json was found but there was no compatible SDK, so it was ignored. 
         /// </summary>
@@ -38,6 +43,9 @@ internal void Initialize(Interop.hostfxr_resolve_sdk2_result_key_t key, string v
                 case Interop.hostfxr_resolve_sdk2_result_key_t.requested_version:
                     RequestedVersion = value;
                     break;
+                case Interop.hostfxr_resolve_sdk2_result_key_t.global_json_state:
+                    GlobalJsonState = value;
+                    break;
             }
         }
     }

test/dotnet.Tests/TelemetryFilterTest.cs

@@ -50,6 +50,20 @@ public void TopLevelCommandNameShouldBeSentToTelemetryWithPerformanceData()
                   e.Measurement["Startup Time"] == 12345);
         }
 
+        [Fact]
+        public void TopLevelCommandNameShouldBeSentToTelemetryWithGlobalJsonState()
+        {
+            string globalJsonState = "invalid_data";
+            var parseResult = Parser.Parse(["build"]);
+            TelemetryEventEntry.SendFiltered(Tuple.Create(parseResult, new Dictionary<string, double>(), globalJsonState));
+            _fakeTelemetry.LogEntries.Should().Contain(e => e.EventName == "toplevelparser/command" &&
+                  e.Properties.ContainsKey("verb") &&
+                  e.Properties["verb"] == Sha256Hasher.Hash("BUILD") &&
+                  e.Measurement == null &&
+                  e.Properties.ContainsKey("globalJson") &&
+                  e.Properties["globalJson"] == Sha256Hasher.HashWithNormalizedCasing(globalJsonState));
+        }
+
         [Fact]
         public void TopLevelCommandNameShouldBeSentToTelemetryWithZeroPerformanceData()
         {