[HttpClient] Add back netstandard2.0 target (#3787)

* Add back netstandard2.0 target

* changelog

* public api files

src/OpenTelemetry.Instrumentation.Http/.publicApi/netstandard2.0/PublicAPI.Unshipped.txt

@@ -0,0 +1,14 @@
+OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions
+OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions.Enrich.get -> System.Action<System.Diagnostics.Activity, string, object>
+OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions.Enrich.set -> void
+OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions.Filter.get -> System.Func<System.Net.Http.HttpRequestMessage, bool>
+OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions.Filter.set -> void
+OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions.HttpClientInstrumentationOptions() -> void
+OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions.RecordException.get -> bool
+OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions.RecordException.set -> void
+OpenTelemetry.Metrics.MeterProviderBuilderExtensions
+OpenTelemetry.Trace.TracerProviderBuilderExtensions
+static OpenTelemetry.Metrics.MeterProviderBuilderExtensions.AddHttpClientInstrumentation(this OpenTelemetry.Metrics.MeterProviderBuilder builder) -> OpenTelemetry.Metrics.MeterProviderBuilder
+static OpenTelemetry.Trace.TracerProviderBuilderExtensions.AddHttpClientInstrumentation(this OpenTelemetry.Trace.TracerProviderBuilder builder) -> OpenTelemetry.Trace.TracerProviderBuilder
+static OpenTelemetry.Trace.TracerProviderBuilderExtensions.AddHttpClientInstrumentation(this OpenTelemetry.Trace.TracerProviderBuilder builder, string name, System.Action<OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions> configureHttpClientInstrumentationOptions) -> OpenTelemetry.Trace.TracerProviderBuilder
+static OpenTelemetry.Trace.TracerProviderBuilderExtensions.AddHttpClientInstrumentation(this OpenTelemetry.Trace.TracerProviderBuilder builder, System.Action<OpenTelemetry.Instrumentation.Http.HttpClientInstrumentationOptions> configureHttpClientInstrumentationOptions) -> OpenTelemetry.Trace.TracerProviderBuilder

src/OpenTelemetry.Instrumentation.Http/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+* Added back `netstandard2.0` target.
+([#3787](https://github.com/open-telemetry/opentelemetry-dotnet/pull/3787))
+
 ## 1.0.0-rc9.8
 
 Released 2022-Oct-17

src/OpenTelemetry.Instrumentation.Http/OpenTelemetry.Instrumentation.Http.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <!-- OmniSharp/VS Code requires TargetFrameworks to be in descending order for IntelliSense and analysis. -->
-    <TargetFrameworks>net6.0;net462</TargetFrameworks>
+    <TargetFrameworks>net6.0;netstandard2.0;net462</TargetFrameworks>
     <Description>Http instrumentation for OpenTelemetry .NET</Description>
     <PackageTags>$(PackageTags);distributed-tracing</PackageTags>
     <IncludeDiagnosticSourceInstrumentationHelpers>true</IncludeDiagnosticSourceInstrumentationHelpers>