[repo] cleanup #nullable disable

CONTRIBUTING.md

 * [ ] [CONTRIBUTING](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/CONTRIBUTING.md) guidelines followed (license requirements, nullable enabled, static analysis, etc.) 
 * [ ] [CONTRIBUTING](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/CONTRIBUTING.md) guidelines followed (license requirements, nullable enabled, static analysis, etc.) 
@@ -308,23 +308,6 @@ analysis](https://learn.microsoft.com/dotnet/fundamentals/code-analysis/overview
 [Common.props](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/build/Common.props)
 new projects must NOT manually override these settings.
 
-## New code
-
-New code files MUST enable [nullable reference
-types](https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/nullable-reference-types)
-manually in projects where it is not automatically enabled project-wide. This is
-done by specifying `#nullable enable` towards the top of the file (usually after
-the copyright header). We are currently working towards enabling nullable
-context in every project by updating code as it is worked on, this requirement
-is to make sure the surface area of code needing updates is shrinking and not
-expanding.
-
-> [!NOTE]
-> The first time a project is updated to use nullable context in public APIs
-some housekeeping needs to be done in public API definitions (`.publicApi`
-folder). This can be done automatically via a code fix offered by the public API
-analyzer.
-
 ## License requirements
 
 OpenTelemetry .NET is licensed under the [Apache License, Version

src/OpenTelemetry.Exporter.Console/Implementation/ConsoleTagWriter.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 using System.Text;
 using OpenTelemetry.Internal;

src/OpenTelemetry.Exporter.Zipkin/Implementation/ZipkinTagWriter.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Buffers.Text;
 using System.Globalization;
 using System.Text.Json;

src/Shared/ActivityHelperExtensions.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
 using OpenTelemetry.Internal;

src/Shared/AssemblyVersionExtensions.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;

src/Shared/Configuration/IConfigurationExtensionsLogger.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 namespace Microsoft.Extensions.Configuration;
 
 internal interface IConfigurationExtensionsLogger

src/Shared/Configuration/OpenTelemetryConfigurationExtensions.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 #if !NETFRAMEWORK && !NETSTANDARD2_0
 using System.Diagnostics.CodeAnalysis;

src/Shared/DiagnosticDefinitions.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 namespace OpenTelemetry.Internal;
 
 internal static class DiagnosticDefinitions

src/Shared/ExceptionExtensions.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Globalization;
 
 namespace OpenTelemetry.Internal;

src/Shared/Guard.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;

src/Shared/Metrics/Base2ExponentialBucketHistogramHelper.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 namespace OpenTelemetry.Metrics;
 
 /// <summary>

src/Shared/Options/DelegatingOptionsFactory.cs

@@ -13,8 +13,6 @@ we take a dependency on Microsoft.Extensions.Options v5.0.0 (or greater), much
  example of how that works.
 */
 
-#nullable enable
-
 using System.Diagnostics;
 #if NET
 using System.Diagnostics.CodeAnalysis;

src/Shared/Options/DelegatingOptionsFactoryServiceCollectionExtensions.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 #if NET
 using System.Diagnostics.CodeAnalysis;

src/Shared/Options/SingletonOptionsManager.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 #if NET
 using System.Diagnostics.CodeAnalysis;
 #endif

src/Shared/PeerServiceResolver.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Runtime.CompilerServices;
 using OpenTelemetry.Trace;
 

src/Shared/PeriodicExportingMetricReaderHelper.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 namespace OpenTelemetry.Metrics;
 
 internal static class PeriodicExportingMetricReaderHelper

src/Shared/PooledList.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Buffers;
 using System.Collections;
 using System.Diagnostics.CodeAnalysis;

src/Shared/ResourceSemanticConventions.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 namespace OpenTelemetry.Resources;
 
 internal static class ResourceSemanticConventions

src/Shared/SemanticConventions.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 namespace OpenTelemetry.Trace;
 
 /// <summary>

src/Shared/SpanAttributeConstants.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 namespace OpenTelemetry.Trace;
 
 /// <summary>

src/Shared/StatusHelper.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Runtime.CompilerServices;
 using OpenTelemetry.Trace;
 

src/Shared/TagWriter/ArrayTagWriter.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 namespace OpenTelemetry.Internal;
 
 internal abstract class ArrayTagWriter<TArrayState>

src/Shared/TagWriter/JsonStringArrayTagWriter.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 using System.Text.Json;
 

src/Shared/TagWriter/TagWriter.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 using System.Globalization;
 

test/OpenTelemetry.Api.Tests/BaggageTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using Xunit;
 
 namespace OpenTelemetry.Tests;

test/OpenTelemetry.Api.Tests/Context/RuntimeContextTest.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using Xunit;
 
 namespace OpenTelemetry.Context.Tests;

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/OtlpRetryTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Net;
 using System.Net.Http.Headers;
 #if NETFRAMEWORK

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/OtlpSpecConfigDefinitionTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Collections;
 using Microsoft.Extensions.Configuration;
 using OpenTelemetry.Metrics;

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/UseOtlpExporterExtensionTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;

test/OpenTelemetry.Shims.OpenTracing.Tests/VersionHelper.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using NuGet.Versioning;
 using OpenTelemetry.Internal;
 using OpenTelemetry.Trace;

test/OpenTelemetry.Tests/Internal/AssemblyVersionExtensionsTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Reflection;
 using Xunit;
 

test/OpenTelemetry.Tests/Internal/JsonStringArrayTagWriterTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Text;
 using Xunit;
 

test/OpenTelemetry.Tests/Internal/PeriodicExportingMetricReaderHelperTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using Microsoft.Extensions.Configuration;
 using OpenTelemetry.Exporter;
 using OpenTelemetry.Metrics;

test/OpenTelemetry.Tests/Internal/SelfDiagnosticsConfigRefresherTest.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics;
 using System.Text;
 using OpenTelemetry.Tests;

test/OpenTelemetry.Tests/Logs/BatchExportLogRecordProcessorOptionsTest.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using Microsoft.Extensions.Configuration;
 using Xunit;
 

test/OpenTelemetry.Tests/Logs/LogRecordSharedPoolTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using Xunit;
 
 namespace OpenTelemetry.Logs.Tests;

test/OpenTelemetry.Tests/Logs/LogRecordStateProcessorTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.Extensions.Logging;
 using Xunit;

test/OpenTelemetry.Tests/Logs/LogRecordThreadStaticPoolTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using Xunit;
 
 namespace OpenTelemetry.Logs.Tests;

test/OpenTelemetry.Tests/Logs/LoggerProviderBuilderExtensionsTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using Microsoft.Extensions.DependencyInjection;
 using OpenTelemetry.Resources;
 using Xunit;

test/OpenTelemetry.Tests/Logs/LoggerProviderExtensionsTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using OpenTelemetry.Exporter;
 using Xunit;
 

test/OpenTelemetry.Tests/Logs/LoggerProviderSdkTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using OpenTelemetry.Exporter;

test/OpenTelemetry.Tests/Logs/OpenTelemetryLoggingExtensionsTests.cs

@@ -1,8 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#nullable enable
-
 using System.Reflection;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;