Removes net452 net46 from OTLP Exporter (#2152)

Author: cijothomas

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/.publicApi/net46/PublicAPI.Unshipped.txt

@@ -0,0 +1,18 @@
+OpenTelemetry.Exporter.OtlpExporterOptions
+OpenTelemetry.Exporter.OtlpExporterOptions.BatchExportProcessorOptions.get -> OpenTelemetry.BatchExportProcessorOptions<System.Diagnostics.Activity>
+OpenTelemetry.Exporter.OtlpExporterOptions.BatchExportProcessorOptions.set -> void
+OpenTelemetry.Exporter.OtlpExporterOptions.Endpoint.get -> System.Uri
+OpenTelemetry.Exporter.OtlpExporterOptions.Endpoint.set -> void
+OpenTelemetry.Exporter.OtlpExporterOptions.ExportProcessorType.get -> OpenTelemetry.ExportProcessorType
+OpenTelemetry.Exporter.OtlpExporterOptions.ExportProcessorType.set -> void
+OpenTelemetry.Exporter.OtlpExporterOptions.Headers.get -> string
+OpenTelemetry.Exporter.OtlpExporterOptions.Headers.set -> void
+OpenTelemetry.Exporter.OtlpExporterOptions.OtlpExporterOptions() -> void
+OpenTelemetry.Exporter.OtlpExporterOptions.TimeoutMilliseconds.get -> int
+OpenTelemetry.Exporter.OtlpExporterOptions.TimeoutMilliseconds.set -> void
+OpenTelemetry.Exporter.OtlpTraceExporter
+OpenTelemetry.Exporter.OtlpTraceExporter.OtlpTraceExporter(OpenTelemetry.Exporter.OtlpExporterOptions options) -> void
+OpenTelemetry.Trace.OtlpTraceExporterHelperExtensions
+override OpenTelemetry.Exporter.OtlpTraceExporter.Export(in OpenTelemetry.Batch<System.Diagnostics.Activity> activityBatch) -> OpenTelemetry.ExportResult
+override OpenTelemetry.Exporter.OtlpTraceExporter.OnShutdown(int timeoutMilliseconds) -> bool
+static OpenTelemetry.Trace.OtlpTraceExporterHelperExtensions.AddOtlpExporter(this OpenTelemetry.Trace.TracerProviderBuilder builder, System.Action<OpenTelemetry.Exporter.OtlpExporterOptions> configure = null) -> OpenTelemetry.Trace.TracerProviderBuilder

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/.publicApi/net452/PublicAPI.Unshipped.txt renamed to src/OpenTelemetry.Exporter.OpenTelemetryProtocol/.publicApi/net461/PublicAPI.Shipped.txt

@@ -9,6 +9,9 @@ please check the latest changes
 
 ## Unreleased
 
+* Removes .NET Framework 4.5.2, .NET 4.6 support. The minimum .NET Framework
+  version supported is .NET 4.6.1. ([#2138](https://github.com/open-telemetry/opentelemetry-dotnet/issues/2138))
+
 ## 1.1.0
 
 Released 2021-Jul-12

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/.publicApi/net461/PublicAPI.Unshipped.txt

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;net452;net46</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net461</TargetFrameworks>
 
     <!--
         There is an integration test for the OTLP exporter that runs a test targeting netcoreapp2.1, netcoreapp3.1 and net5.0.
@@ -26,6 +26,12 @@
     <MinVerTagPrefix>core-</MinVerTagPrefix>
   </PropertyGroup>
 
+  <!--Do not run ApiCopmat for net461 as this is newly added. There is no existing contract for net461 against which we could compare the implementation.
+  Remove this property once we have released a stable net461 version.-->
+  <PropertyGroup Condition="'$(TargetFramework)' == 'net461'">
+    <RunApiCompat>false</RunApiCompat>
+  </PropertyGroup>
+
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.1'">
     <PackageReference Include="Grpc.Net.Client" Version="$(GrpcNetClientPkgVer)" />
   </ItemGroup>

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFrameworks Condition="$(TARGET_FRAMEWORK) == ''">netcoreapp2.1;netcoreapp3.1;net5.0</TargetFrameworks>
-    <TargetFrameworks Condition="$(TARGET_FRAMEWORK) == '' AND $(OS) == 'Windows_NT'">$(TargetFrameworks);net452;net46</TargetFrameworks>
+    <TargetFrameworks Condition="$(TARGET_FRAMEWORK) == '' AND $(OS) == 'Windows_NT'">$(TargetFrameworks);net461</TargetFrameworks>
     <TargetFrameworks Condition="$(TARGET_FRAMEWORK) != ''">$(TARGET_FRAMEWORK)</TargetFrameworks>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
@@ -22,7 +22,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Compile Include="$(RepoRoot)\src\OpenTelemetry\Internal\DateTimeOffsetExtensions.net452.cs" Link="Includes\DateTimeOffsetExtensions.net452.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\DelegatingTestExporter.cs" Link="Includes\DelegatingTestExporter.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\EventSourceTestHelper.cs" Link="Includes\EventSourceTestHelper.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\SkipUnlessEnvVarFoundFactAttribute.cs" Link="Includes\SkipUnlessEnvVarFoundFactAttribute.cs" />

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/OpenTelemetry.Exporter.OpenTelemetryProtocol.csproj

@@ -24,9 +24,6 @@
 using Grpc.Core;
 using OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation;
 using OpenTelemetry.Resources;
-#if NET452
-using OpenTelemetry.Internal;
-#endif
 using OpenTelemetry.Tests;
 using OpenTelemetry.Trace;
 using Xunit;
@@ -194,11 +191,7 @@ public void ToOtlpSpanTest()
             var startTime = new DateTime(2020, 02, 20, 20, 20, 20, DateTimeKind.Utc);
 
             DateTimeOffset dateTimeOffset;
-#if NET452
-            dateTimeOffset = DateTimeOffsetExtensions.FromUnixTimeMilliseconds(0);
-#else
             dateTimeOffset = DateTimeOffset.FromUnixTimeMilliseconds(0);
-#endif
 
             var expectedUnixTimeTicks = (ulong)(startTime.Ticks - dateTimeOffset.Ticks);
             var duration = TimeSpan.FromMilliseconds(1555);