OTLP over http/protobuf as default exporter (#351)

open-telemetry · Feb 10, 2022 · c65a787 · c65a787
1 parent d741e31
commit c65a787
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Showing 19 changed files with 213 additions and 93 deletions.
diff --git a/OpenTelemetry.ClrProfiler.sln b/OpenTelemetry.ClrProfiler.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.28803.452
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.32112.339
 MinimumVisualStudioVersion = 15.0.26124.0
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "OpenTelemetry.ClrProfiler.Native", "src\OpenTelemetry.ClrProfiler.Native\OpenTelemetry.ClrProfiler.Native.vcxproj", "{91B6272F-5780-4C94-8071-DBBA7B4F67F3}"
 	ProjectSection(ProjectDependencies) = postProject
@@ -129,7 +129,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "IntegrationTests.StartupHoo
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Samples.StartupHook", "test\test-applications\integrations\Samples.StartupHook\Samples.StartupHook.csproj", "{FF665CC4-6643-4614-A1A0-FA182E3AF37C}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenTelemetry.Instrumentation.AdditionalDeps", "src\OpenTelemetry.Instrumentation.AdditionalDeps\OpenTelemetry.Instrumentation.AdditionalDeps.csproj", "{E026D9FA-FBD5-4066-AF6A-FB63DE28521F}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.AdditionalDeps", "src\OpenTelemetry.Instrumentation.AdditionalDeps\OpenTelemetry.Instrumentation.AdditionalDeps.csproj", "{E026D9FA-FBD5-4066-AF6A-FB63DE28521F}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenTelemetry.ClrProfiler.Managed.Tests", "test\OpenTelemetry.ClrProfiler.Managed.Tests\OpenTelemetry.ClrProfiler.Managed.Tests.csproj", "{065FEB4E-A99E-4A59-8112-1CB30CF794F9}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -499,6 +501,18 @@ Global
 		{E026D9FA-FBD5-4066-AF6A-FB63DE28521F}.Release|x64.Build.0 = Release|Any CPU
 		{E026D9FA-FBD5-4066-AF6A-FB63DE28521F}.Release|x86.ActiveCfg = Release|Any CPU
 		{E026D9FA-FBD5-4066-AF6A-FB63DE28521F}.Release|x86.Build.0 = Release|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Debug|x64.Build.0 = Debug|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Debug|x86.Build.0 = Debug|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Release|x64.ActiveCfg = Release|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Release|x64.Build.0 = Release|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Release|x86.ActiveCfg = Release|Any CPU
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -542,6 +556,7 @@ Global
 		{0584ADC1-956E-49B0-A46F-8405AA2AD207} = {357C3F25-98CA-41C6-BA2C-20968695D026}
 		{FF665CC4-6643-4614-A1A0-FA182E3AF37C} = {E409ADD3-9574-465C-AB09-4324D205CC7C}
 		{E026D9FA-FBD5-4066-AF6A-FB63DE28521F} = {9E5F0022-0A50-40BF-AC6A-C3078585ECAB}
+		{065FEB4E-A99E-4A59-8112-1CB30CF794F9} = {5C915382-C886-457D-8641-9E766D8E5A17}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {160A1D00-1F5B-40F8-A155-621B4459D78F}

diff --git a/build/nuke/Build.Steps.cs b/build/nuke/Build.Steps.cs
@@ -125,6 +125,11 @@ partial class Build
                 .SetConfiguration(BuildConfiguration)
                 .SetNoRestore(true));
 
+            DotNetBuild(x => x
+                .SetProjectFile(Solution.GetProject(Projects.Tests.ClrProfilerManagedTests))
+                .SetConfiguration(BuildConfiguration)
+                .SetNoRestore(true));
+
             DotNetMSBuild(x => x
                 .SetTargetPath(MsBuildProject)
                 .SetTargetPlatform(Platform)
@@ -265,7 +270,8 @@ partial class Build
 
             var unitTestProjects = new[]
             {
-                Solution.GetProject(Projects.Tests.ClrProfilerManagedLoaderTests)
+                Solution.GetProject(Projects.Tests.ClrProfilerManagedLoaderTests),
+                Solution.GetProject(Projects.Tests.ClrProfilerManagedTests)
             };
 
             DotNetTest(config => config

diff --git a/build/nuke/Projects.cs b/build/nuke/Projects.cs
@@ -12,6 +12,7 @@ public static class Tests
         public const string ClrProfilerNativeTests = "OpenTelemetry.ClrProfiler.Native.Tests";
         public const string ClrProfilerManagedLoaderTests = "OpenTelemetry.ClrProfiler.Managed.Loader.Tests";
         public const string ClrProfilerManagedBootstrappingTests = "OpenTelemetry.ClrProfiler.Managed.Bootstrapping.Tests";
+        public const string ClrProfilerManagedTests = "OpenTelemetry.ClrProfiler.Managed.Tests";
 
         public const string IntegrationTestsHelpers = "IntegrationTests.Helpers";
     }

diff --git a/dev/docker-compose.yaml b/dev/docker-compose.yaml
@@ -20,7 +20,7 @@ services:
       - "8888:8888"  # Prometheus metrics exposed by the collector
       - "8889:8889"  # Prometheus exporter metrics
       - "13133:13133" # health_check extension
-      - "4317:4317"  # OTLP gRPC receiver
+      - "4318:4318"  # OTLP http/protobuf receiver
       - "55679:55679" # zpages extension
       - "9411:9411"  # zipkin receiver
     depends_on:

diff --git a/dev/envvars.sh b/dev/envvars.sh
@@ -59,7 +59,6 @@ export DOTNET_STARTUP_HOOKS="${CURDIR}/bin/tracer-home/netcoreapp3.1/OpenTelemet
 export OTEL_DOTNET_TRACER_HOME="${CURDIR}/bin/tracer-home"
 export OTEL_INTEGRATIONS="${CURDIR}/bin/tracer-home/integrations.json"
 export OTEL_TRACE_DEBUG="1"
-export OTEL_EXPORTER="zipkin"
 export OTEL_DUMP_ILREWRITE_ENABLED="0"
 export OTEL_CLR_ENABLE_INLINING="1"
 export OTEL_PROFILER_EXCLUDE_PROCESSES="dotnet.exe,dotnet"
diff --git a/docs/USAGE.md b/docs/USAGE.md
@@ -65,13 +65,13 @@ The exporter is used to output the telemetry.
 
 | Environment variable | Description | Default |
 |-|-|-|
-| `OTEL_EXPORTER` | The exporter to be used. The Tracer uses it to encode and dispatch traces. Available values are: `zipkin`, `jeager`, `otlp`. | |
+| `OTEL_EXPORTER` | The exporter to be used. The Tracer uses it to encode and dispatch traces. Available values are: `zipkin`, `jeager`, `otlp`. | `otlp` |
 | `OTEL_EXPORTER_JAEGER_AGENT_HOST` | Hostname for the Jaeger agent. | `localhost` |
 | `OTEL_EXPORTER_JAEGER_AGENT_PORT` | Port for the Jaeger agent. | `6831` |
-| `OTEL_EXPORTER_OTLP_ENDPOINT` | Target endpoint for OTLP exporter. More details [here](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md). | `http://localhost:4318` |
+| `OTEL_EXPORTER_OTLP_ENDPOINT` | Target endpoint for OTLP exporter. More details [here](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md). | `http://localhost:4318` for `http/protobuf` protocol, `http://localhost:4317` for `grpc` protocol |
 | `OTEL_EXPORTER_OTLP_HEADERS` | Key-value pairs to be used as headers associated with gRPC or HTTP requests. More details [here](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md). | |
 | `OTEL_EXPORTER_OTLP_TIMEOUT` | Maximum time the OTLP exporter will wait for each batch export. | `1000` (ms) |
-| `OTEL_EXPORTER_OTLP_PROTOCOL` | The OTLP expoter transport protocol. Supported values: `grpc`, `http/protobuf`. [1] | `grpc` |
+| `OTEL_EXPORTER_OTLP_PROTOCOL` | The OTLP expoter transport protocol. Supported values: `grpc`, `http/protobuf`. [1] | `http/protobuf` |
 | `OTEL_EXPORTER_ZIPKIN_ENDPOINT` | Zipkin URL. | `http://localhost:8126` |
 
 **[1]**: `OTEL_EXPORTER_OTLP_PROTOCOL` remarks:

diff --git a/src/OpenTelemetry.ClrProfiler.Managed/Configuration/ConfigurationKeys.cs b/src/OpenTelemetry.ClrProfiler.Managed/Configuration/ConfigurationKeys.cs
@@ -22,10 +22,21 @@ public class ConfigurationKeys
         /// <summary>
         /// Configuration key for the exporter to be used. The Tracer uses it to encode and
         /// dispatch traces.
-        /// Default is <c>"Zipkin"</c>.
+        /// Default is <c>"otlp"</c>.
         /// </summary>
         public const string Exporter = "OTEL_EXPORTER";
 
+        /// <summary>
+        /// Configuration key for the otlp protocol to be used.
+        /// Default is <c>"http/protobuf"</c>.
+        /// </summary>
+        public const string ExporterOtlpProtocol = "OTEL_EXPORTER_OTLP_PROTOCOL";
+
+        /// <summary>
+        /// Configuration key for the otlp exporter endpoint to be used.
+        /// </summary>
+        public const string ExporterOtlpEndpoint = "OTEL_EXPORTER_OTLP_ENDPOINT";
+
         /// <summary>
         /// Configuration key for whether the console exporter is enabled.
         /// </summary>
@@ -42,7 +53,7 @@ public class ConfigurationKeys
         public const string DisabledInstrumentations = "OTEL_DOTNET_TRACER_DISABLED_INSTRUMENTATIONS";
 
         /// <summary>
-        /// Configuration key for colon (:) separated list of plugins repesented by <see cref="System.Type.AssemblyQualifiedName"/>.
+        /// Configuration key for colon (:) separated list of plugins represented by <see cref="System.Type.AssemblyQualifiedName"/>.
         /// </summary>
         public const string ProviderPlugins = "OTEL_DOTNET_TRACER_INSTRUMENTATION_PLUGINS";
 

diff --git a/src/OpenTelemetry.ClrProfiler.Managed/Configuration/EnvironmentConfigurationHelper.cs b/src/OpenTelemetry.ClrProfiler.Managed/Configuration/EnvironmentConfigurationHelper.cs
@@ -1,8 +1,9 @@
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
-using System.Reflection;
+#if NETCOREAPP3_1
+using OpenTelemetry.Exporter;
+#endif
 using OpenTelemetry.Resources;
 using OpenTelemetry.Trace;
 
@@ -70,21 +71,32 @@ private static TracerProviderBuilder SetExporter(this TracerProviderBuilder buil
                     break;
                 case "otlp":
 #if NETCOREAPP3_1
-                    // Adding the OtlpExporter creates a GrpcChannel.
-                    // This switch must be set before creating a GrpcChannel/HttpClient when calling an insecure gRPC service.
-                    // See: https://docs.microsoft.com/aspnet/core/grpc/troubleshoot#call-insecure-grpc-services-with-net-core-client
-                    AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
+                    if (!settings.OtlpExportProtocol.HasValue || settings.OtlpExportProtocol != OtlpExportProtocol.HttpProtobuf)
+                    {
+                        // Adding the OtlpExporter creates a GrpcChannel.
+                        // This switch must be set before creating a GrpcChannel/HttpClient when calling an insecure gRPC service.
+                        // See: https://docs.microsoft.com/aspnet/core/grpc/troubleshoot#call-insecure-grpc-services-with-net-core-client
+                        AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
+                    }
 #endif
                     builder.AddOtlpExporter(options =>
                     {
-                        options.ExportProcessorType = ExportProcessorType.Simple; // workaround for https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/issues/290
+                        if (settings.OtlpExportProtocol.HasValue)
+                        {
+                            options.Protocol = settings.OtlpExportProtocol.Value;
+                        }
+
+                        if (settings.OtlpExportEndpoint != null)
+                        {
+                            options.Endpoint = settings.OtlpExportEndpoint;
+                        }
                     });
                     break;
                 case "":
                 case null:
                     break;
                 default:
-                    throw new ArgumentOutOfRangeException("The exporter name is not recognised");
+                    throw new FormatException($"The exporter name '{settings.Exporter}' is not recognized");
             }
 
             return builder;

diff --git a/src/OpenTelemetry.ClrProfiler.Managed/Configuration/Settings.cs b/src/OpenTelemetry.ClrProfiler.Managed/Configuration/Settings.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using OpenTelemetry.Exporter;
 
 namespace OpenTelemetry.ClrProfiler.Managed.Configuration
 {
@@ -23,7 +24,10 @@ private Settings(IConfigurationSource source)
                 throw new ArgumentNullException(nameof(source));
             }
 
-            Exporter = source.GetString(ConfigurationKeys.Exporter);
+            Exporter = source.GetString(ConfigurationKeys.Exporter) ?? "otlp";
+            OtlpExportProtocol = GetExporterOtlpProtocol(source);
+            OtlpExportEndpoint = GetExporterOtlpEndpoint(source, OtlpExportProtocol);
+
             LoadTracerAtStartup = source.GetBool(ConfigurationKeys.LoadTracerAtStartup) ?? true;
             ConsoleExporterEnabled = source.GetBool(ConfigurationKeys.ConsoleExporterEnabled) ?? true;
 
@@ -89,16 +93,11 @@ private Settings(IConfigurationSource source)
         }
 
         /// <summary>
-        /// Gets or sets a value indicating whether tracing is enabled.
+        /// Gets a value indicating whether tracing is enabled.
         /// Default is <c>true</c>.
         /// </summary>
         /// <seealso cref="ConfigurationKeys.TraceEnabled"/>
-        public bool TraceEnabled { get; set; }
-
-        /// <summary>
-        /// Gets the version of the service
-        /// </summary>
-        public string ServiceVersion { get; }
+        public bool TraceEnabled { get; }
 
         /// <summary>
         /// Gets a value indicating whether the tracer should be loaded by the profiler. Default is true.
@@ -111,14 +110,16 @@ private Settings(IConfigurationSource source)
         public string Exporter { get; }
 
         /// <summary>
-        /// Gets jaeger exporter agent host.
+        /// Gets the the OTLP transport protocol. Supported values: Grpc and HttpProtobuf.
         /// </summary>
-        public string JaegerExporterAgentHost { get; }
+        public OtlpExportProtocol? OtlpExportProtocol { get; }
 
         /// <summary>
-        /// Gets jaeger exporter agent port.
+        /// Gets the the OTLP exporter endpoint.
+        /// Will be removed when https://github.com/open-telemetry/opentelemetry-dotnet/pull/2868 is released.
         /// </summary>
-        public int JaegerExporterAgentPort { get; }
+        // TODO: To be removed when https://github.com/open-telemetry/opentelemetry-dotnet/pull/2868 is released.
+        public Uri OtlpExportEndpoint { get; }
 
         /// <summary>
         /// Gets a value indicating whether the console exporter is enabled.
@@ -131,12 +132,12 @@ private Settings(IConfigurationSource source)
         public IList<Instrumentation> EnabledInstrumentations { get; }
 
         /// <summary>
-        /// Gets the list of plugins repesented by <see cref="Type.AssemblyQualifiedName"/>.
+        /// Gets the list of plugins represented by <see cref="Type.AssemblyQualifiedName"/>.
         /// </summary>
         public IList<string> TracerPlugins { get; } = new List<string>();
 
         /// <summary>
-        /// Gets the list of activitysources to be added to the tracer at the startup.
+        /// Gets the list of activity sources to be added to the tracer at the startup.
         /// </summary>
         public IList<string> ActivitySources { get; } = new List<string> { "OpenTelemetry.ClrProfiler.*" };
 
@@ -164,5 +165,35 @@ internal static Settings FromDefaultSources()
 
             return new Settings(configurationSource);
         }
+
+        private static OtlpExportProtocol? GetExporterOtlpProtocol(IConfigurationSource source)
+        {
+            // the defualt in SDK is grpc. http/protobuf should be default for our purposes
+            var exporterOtlpProtocol = source.GetString(ConfigurationKeys.ExporterOtlpProtocol);
+
+            if (string.IsNullOrEmpty(exporterOtlpProtocol) || exporterOtlpProtocol == "http/protobuf")
+            {
+                // override settings only for http/protobuf
+                // the second part of the condition is needed to override default endpoint as long as https://github.com/open-telemetry/opentelemetry-dotnet/pull/2868 is not fixed
+                return OpenTelemetry.Exporter.OtlpExportProtocol.HttpProtobuf;
+            }
+
+            // null value here means that it will be handled by OTEL .NET SDK
+            return null;
+        }
+
+        private static Uri GetExporterOtlpEndpoint(IConfigurationSource source, OtlpExportProtocol? otlpExportProtocol)
+        {
+            var exporterOtlpEndpoint = source.GetString(ConfigurationKeys.ExporterOtlpEndpoint);
+
+            if (otlpExportProtocol == OpenTelemetry.Exporter.OtlpExportProtocol.HttpProtobuf && string.IsNullOrWhiteSpace(exporterOtlpEndpoint))
+            {
+                // override endpoint only for otlp over http/protobuf
+                return new Uri("http://localhost:4318/v1/traces");
+            }
+
+            // null value here means that it will be handled by OTEL .NET SDK
+            return null;
+        }
     }
 }
diff --git a/src/OpenTelemetry.ClrProfiler.Managed/Properties/AssemblyInfo.cs b/src/OpenTelemetry.ClrProfiler.Managed/Properties/AssemblyInfo.cs
@@ -0,0 +1,3 @@
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("OpenTelemetry.ClrProfiler.Managed.Tests")]
diff --git a/test/Directory.Build.props b/test/Directory.Build.props
@@ -15,7 +15,14 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
     <PackageReference Include="Moq" Version="4.16.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.1.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
   </ItemGroup>
 
   <!-- StyleCop -->

diff --git a/....Managed.Bootstrapping.Tests/OpenTelemetry.ClrProfiler.Managed.Bootstrapping.Tests.csproj b/....Managed.Bootstrapping.Tests/OpenTelemetry.ClrProfiler.Managed.Bootstrapping.Tests.csproj
@@ -1,18 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-
-  <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
-    <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-      <PrivateAssets>all</PrivateAssets>
-    </PackageReference>
-    <PackageReference Include="coverlet.collector" Version="3.1.0">
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-      <PrivateAssets>all</PrivateAssets>
-    </PackageReference>
-  </ItemGroup>
-
   <ItemGroup>
     <ProjectReference Include="..\..\src\OpenTelemetry.ClrProfiler.Managed\OpenTelemetry.ClrProfiler.Managed.csproj" />
   </ItemGroup>

diff --git a/...ry.ClrProfiler.Managed.Loader.Tests/OpenTelemetry.ClrProfiler.Managed.Loader.Tests.csproj b/...ry.ClrProfiler.Managed.Loader.Tests/OpenTelemetry.ClrProfiler.Managed.Loader.Tests.csproj
@@ -1,18 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-
-  <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
-    <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-      <PrivateAssets>all</PrivateAssets>
-    </PackageReference>
-    <PackageReference Include="coverlet.collector" Version="3.1.0">
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-      <PrivateAssets>all</PrivateAssets>
-    </PackageReference>
-  </ItemGroup>
-
   <ItemGroup>
     <ProjectReference Include="..\..\src\OpenTelemetry.ClrProfiler.Managed.Loader\OpenTelemetry.ClrProfiler.Managed.Loader.csproj" />
   </ItemGroup>
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		using System.Runtime.CompilerServices;

		[assembly: InternalsVisibleTo("OpenTelemetry.ClrProfiler.Managed.Tests")]