Log SDK resolution result

src/Build.UnitTests/BackEnd/SdkResolverService_Tests.cs

@@ -94,6 +94,8 @@ public void AssertResolutionWarnsIfResolvedVersionIsDifferentFromReferencedVersi
 
             result.Path.ShouldBe("path");
 
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
+
             _logger.WarningCount.ShouldBe(1);
             _logger.Warnings.First().Code.ShouldStartWith("MSB4241");
         }
@@ -111,7 +113,6 @@ public void AssertResolverThrows()
             e.Sdk.Name.ShouldBe("1sdkName");
         }
 
-
         [Fact]
         // Scenario: MockSdkResolverWithResolvableSdkPattern2 is a specific resolver (i.e. resolver with pattern)
         // and it successfully resolves sdk.
@@ -124,6 +125,7 @@ public void AssertSecondResolverWithPatternCanResolve()
             var result = SdkResolverService.Instance.ResolveSdk(BuildEventContext.InvalidSubmissionId, sdk, _loggingContext, new MockElementLocation("file"), "sln", "projectPath", interactive: false, isRunningInVisualStudio: false, failOnUnresolvedSdk: true);
 
             result.Path.ShouldBe("resolverpathwithresolvablesdkpattern2");
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
             _logger.BuildMessageEvents.Select(i => i.Message).ShouldContain("MockSdkResolverWithResolvableSdkPattern2 running");
             _logger.BuildMessageEvents.Select(i => i.Message).ShouldNotContain("MockSdkResolver1 running");
             _logger.BuildMessageEvents.Select(i => i.Message).ShouldNotContain("MockSdkResolver2 running");
@@ -141,6 +143,7 @@ public void AssertFirstResolverCanResolve()
             var result = SdkResolverService.Instance.ResolveSdk(BuildEventContext.InvalidSubmissionId, sdk, _loggingContext, new MockElementLocation("file"), "sln", "projectPath", interactive: false, isRunningInVisualStudio: false, failOnUnresolvedSdk: true);
 
             result.Path.ShouldBe("resolverpath1");
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
             _logger.BuildMessageEvents.Select(i => i.Message).ShouldContain("MockSdkResolver1 running");
             _logger.BuildMessageEvents.Select(i => i.Message).ShouldNotContain("MockSdkResolverWithResolvableSdkPattern1 running");
         }
@@ -162,6 +165,7 @@ public void AssertFirstResolverWithPatternCantResolveChangeWave17_4()
                 var result = SdkResolverService.Instance.ResolveSdk(BuildEventContext.InvalidSubmissionId, sdk, _loggingContext, new MockElementLocation("file"), "sln", "projectPath", interactive: false, isRunningInVisualStudio: false, failOnUnresolvedSdk: true);
 
                 result.Path.ShouldBe("resolverpath1");
+                _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
                 _logger.BuildMessageEvents.Select(i => i.Message).ShouldContain("MockSdkResolver1 running");
                 _logger.BuildMessageEvents.Select(i => i.Message).ShouldNotContain("MockSdkResolverWithResolvableSdkPattern1 running");
                 ChangeWaves.ResetStateForTests();
@@ -180,6 +184,7 @@ public void AssertFirstResolverWithPatternCanResolve()
             var result = SdkResolverService.Instance.ResolveSdk(BuildEventContext.InvalidSubmissionId, sdk, _loggingContext, new MockElementLocation("file"), "sln", "projectPath", interactive: false, isRunningInVisualStudio: false, failOnUnresolvedSdk: true);
 
             result.Path.ShouldBe("resolverpathwithresolvablesdkpattern1");
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
             _logger.BuildMessageEvents.Select(i => i.Message).ShouldContain("MockSdkResolverWithResolvableSdkPattern1 running");
             _logger.BuildMessageEvents.Select(i => i.Message).ShouldNotContain("MockSdkResolver1 running");
         }
@@ -196,6 +201,7 @@ public void AssertFirstResolverErrorsSupressedWhenResolved()
             var result = SdkResolverService.Instance.ResolveSdk(BuildEventContext.InvalidSubmissionId, sdk, _loggingContext, new MockElementLocation("file"), "sln", "projectPath", interactive: false, isRunningInVisualStudio: false, failOnUnresolvedSdk: true);
 
             result.Path.ShouldBe("resolverpath2");
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
 
             // Both resolvers should run, and no ERROR string.
             _logger.BuildMessageEvents.Select(i => i.Message).ShouldContain("MockSdkResolver1 running");
@@ -366,6 +372,7 @@ public void SdkResolverCanReturnNoPaths(bool includePropertiesAndItems)
 
             ValidateExpectedPropertiesAndItems(includePropertiesAndItems, result);
 
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue(); 
             _logger.WarningCount.ShouldBe(0);
         }
 
@@ -402,6 +409,7 @@ public void SdkResultCanReturnPropertiesAndItems()
 
             ValidateExpectedPropertiesAndItems(true, result);
 
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
             _logger.WarningCount.ShouldBe(0);
         }
 
@@ -454,6 +462,7 @@ public void SdkResultCanReturnMultiplePaths(bool includePropertiesAndItems)
 
             ValidateExpectedPropertiesAndItems(includePropertiesAndItems, result);
 
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
             _logger.WarningCount.ShouldBe(0);
         }
 
@@ -499,6 +508,7 @@ public void AssertResolutionWarnsIfResolvedVersionIsDifferentFromReferencedVersi
 
             ValidateExpectedPropertiesAndItems(true, result);
 
+            _logger.BuildMessageEvents.Any(i => i.Message.StartsWith($"The SDK \"{sdk}\" was successfully resolved")).ShouldBeTrue();
             _logger.WarningCount.ShouldBe(1);
             _logger.Warnings.First().Code.ShouldStartWith("MSB4241");
         }

src/Build/BackEnd/Components/SdkResolution/SdkResolverService.cs

@@ -355,6 +355,8 @@ private bool TryResolveSdkUsingSpecifiedResolvers(
 
                 if (result.Success)
                 {
+                    loggingContext.LogComment(MessageImportance.Low, "SucceededToResolveSDK", sdk.ToString(), sdkResolver.Name, result.Path ?? "null", result.Version ?? "null");
+
                     LogWarnings(loggingContext, sdkReferenceLocation, result.Warnings);
 
                     if (!IsReferenceSameVersion(sdk, result.Version))

src/Build/Resources/Strings.resx

@@ -1324,6 +1324,9 @@
     <value>Could not resolve SDK "{0}". Exactly one of the probing messages below indicates why we could not resolve the SDK. Investigate and resolve that message to correctly specify the SDK.
   {1}</value>
   </data>
+  <data name="SucceededToResolveSDK" xml:space="preserve">
+    <value>The SDK "{0}" was successfully resolved by the SDK resolver "{1}". SDK Result: "Path : {2}, Version : {3}"</value>
+  </data>
   <data name="CouldNotRunNuGetSdkResolver" xml:space="preserve">
     <value>The NuGet-based SDK resolver failed to run because NuGet assemblies could not be located.  Check your installation of MSBuild or set the environment variable "{0}" to the folder that contains the required NuGet assemblies. {1}</value>
   </data>