Metrics switch support in the SDK (#35418)

Author: tarekgh

src/Assets/TestProjects/KitchenSink/TestApp/TestApp.csproj

@@ -14,6 +14,7 @@
     <EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization>false</EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization>
     <DebuggerSupport>true</DebuggerSupport>
     <EventSourceSupport>false</EventSourceSupport>
+    <MetricsSupport>false</MetricsSupport>
     <InvariantGlobalization>true</InvariantGlobalization>
     <PredefinedCulturesOnly>true</PredefinedCulturesOnly>
     <ConcurrentGarbageCollection>false</ConcurrentGarbageCollection>

src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets

@@ -504,6 +504,11 @@ Copyright (c) .NET Foundation. All rights reserved.
                                     Value="$(DebuggerSupport)"
                                     Trim="true" />
 
+    <RuntimeHostConfigurationOption Include="System.Diagnostics.Metrics.Meter.IsSupported"
+                                    Condition="'$(MetricsSupport)' != ''"
+                                    Value="$(MetricsSupport)"
+                                    Trim="true" />
+
     <RuntimeHostConfigurationOption Include="System.Diagnostics.Tracing.EventSource.IsSupported"
                                     Condition="'$(EventSourceSupport)' != ''"
                                     Value="$(EventSourceSupport)"

src/Tests/Microsoft.NET.Build.Tests/GivenThatWeWantToBuildALibrary.cs

@@ -896,6 +896,50 @@ public void It_can_implicitly_define_predefined_Cultures_only(string targetFrame
             }
         }
 
+        [Theory]
+        [InlineData("True")]
+        [InlineData("False")]
+        [InlineData(null)]
+        public void It_can_evaluate_metrics_support(string value)
+        {
+            var testProj = new TestProject()
+            {
+                Name = "CheckMetricsSupport",
+                TargetFrameworks = ToolsetInfo.CurrentTargetFramework,
+                IsExe = true,
+            };
+
+            if (value is not null)
+            {
+                testProj.AdditionalProperties["MetricsSupport"] = value;
+            }
+
+            var testAsset = _testAssetsManager.CreateTestProject(testProj, identifier: value);
+            var buildCommand = new BuildCommand(testAsset);
+            buildCommand
+                .Execute()
+                .Should()
+                .Pass();
+
+            string runtimeConfigName = $"{testProj.Name}.runtimeconfig.json";
+            var outputDirectory = buildCommand.GetOutputDirectory(testProj.TargetFrameworks);
+            outputDirectory.Should().HaveFile(runtimeConfigName);
+
+            string runtimeConfigFile = Path.Combine(outputDirectory.FullName, runtimeConfigName);
+            string runtimeConfigContents = File.ReadAllText(runtimeConfigFile);
+            JObject runtimeConfig = JObject.Parse(runtimeConfigContents);
+            JToken metricsSupport = runtimeConfig["runtimeOptions"]["configProperties"]["System.Diagnostics.Metrics.Meter.IsSupported"];
+
+            if (value is null)
+            {
+                metricsSupport.Should().BeNull();
+            }
+            else
+            {
+                metricsSupport.Value<string>().Should().Be(value);
+            }
+        }
+
         [Theory]
         [InlineData("netcoreapp2.2", null, false, null, false)]
         [InlineData(ToolsetInfo.CurrentTargetFramework, null, true, null, true)]

src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToPublishAProjectWithAllFeatures.cs

@@ -60,6 +60,7 @@ public void It_publishes_the_project_correctly(string targetFramework, string []
             ""System.AggressiveAttributeTrimming"": true,
             ""System.ComponentModel.TypeConverter.EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization"": false,
             ""System.Diagnostics.Debugger.IsSupported"": true,
+            ""System.Diagnostics.Metrics.Meter.IsSupported"": false,
             ""System.Diagnostics.Tracing.EventSource.IsSupported"": false,
             ""System.Globalization.Invariant"": true,
             ""System.Globalization.PredefinedCulturesOnly"": true,
@@ -101,7 +102,7 @@ public void It_publishes_the_project_correctly(string targetFramework, string []
             baselineConfigJsonObject["runtimeOptions"]["tfm"] = targetFramework;
             baselineConfigJsonObject["runtimeOptions"]["framework"]["version"] =
                 targetFramework == "net6.0" ? "6.0.0" : "1.1.2";
-            
+
             runtimeConfigJsonObject
                 .Should()
                 .BeEquivalentTo(baselineConfigJsonObject);