Upgrade to .NET 10 and modernize project infrastructure

[xavierjohn]

Upgrades the ServiceLevelIndicators library from .NET 8 to .NET 10, modernizes tooling, and updates all dependencies to their latest compatible versions.

Changes

Framework & SDK
Target framework: net8.0 → net10.0
SDK: 8.0.100 → 10.0.100 (stable)
Version: 8.0 → 10.0-preview.{height}

Solution format
Migrated from .sln to .slnx (VS 2026 XML-based solution format)
Deleted ServiceLevelIndicators.sln, added ServiceLevelIndicators.slnx

Test framework
Migrated from xUnit 2.8.0 to xUnit v3 (3.2.2)
Removed xunit.runner.json (no longer needed)
Updated async tests to use TestContext.Current.CancellationToken
Removed Xunit.Abstractions namespace references
Package upgrades (via Central Package Management)

Asp.Versioning packages → 10.0.0-preview.1 (extension methods → extension properties)
Azure.Core 1.44.0 → 1.51.1
OpenTelemetry 1.9.0 → 1.15.0
FluentAssertions 6.12.0 → 7.2.0
Microsoft.NET.Test.Sdk 17.9.0 → 18.3.0
coverlet.collector 6.0.2 → 8.0.0
Nerdbank.GitVersioning 3.6.143 → 3.9.50
All Microsoft.AspNetCore/Extensions packages → 10.0.3
Swashbuckle.AspNetCore kept at 6.8.1 (v10+ has breaking OpenAPI v2 changes)

[Copilot]

Pull request overview

Upgrades the ServiceLevelIndicators library and its samples/tests to .NET 10, modernizes solution/build tooling, and updates dependencies (notably xUnit v3 and OpenTelemetry) to newer compatible versions.

Changes:

• Move repository build to .NET 10 (SDK + target frameworks) and update versioning to 10.0-preview.{height}.
• Migrate tests to xUnit v3 and update API-versioning-related code to match newer Asp.Versioning APIs.
• Modernize infrastructure: switch solution to .slnx, refresh EditorConfig, and update local metrics viewing docs/scripts to use the Aspire Dashboard.

Reviewed changes

Copilot reviewed 48 out of 73 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
version.json	Bumps Nerdbank.GitVersioning version string to 10.x preview.
global.json	Pins repo SDK to 10.0.100 and removes msbuild-sdks section.
Directory.Build.props	Updates default TargetFramework to net10.0.
Directory.Packages.props	Central package upgrades (Asp.Versioning 10 preview, OpenTelemetry 1.15, xUnit v3, etc.).
.editorconfig	Replaces/modernizes formatting + analyzer settings.
README.md	Updates local metrics instructions to Aspire Dashboard.
.github/copilot-instructions.md	Adds repo-specific dependency constraints.
.gitignore	Removes ignore entry tied to deleted DockerOpenTelemetry output log file.
ServiceLevelIndicators.sln	Deletes legacy .sln.
ServiceLevelIndicators.slnx	Adds new VS 2026 .slnx solution format.
build/xunit.runner.json	Removes runner config file.
build/test.props	Switches test packages to xUnit v3 and removes runner json linkage; adds CA1707 suppression.
ServiceLevelIndicators/tests/ServiceLevelIndicatorTests.cs	Updates tests for new tooling; removes xUnit abstractions using.
ServiceLevelIndicators/tests/LocationIdTests.cs	Formatting-only adjustments.
ServiceLevelIndicators/tests/CustomerResourceIdTests.cs	Formatting-only adjustments.
ServiceLevelIndicators/src/ServiceLevelIndicatorOptions.cs	Formatting-only adjustments.
ServiceLevelIndicators/src/ServiceLevelIndicator.cs	Formatting-only adjustments.
ServiceLevelIndicators/src/MeasuredOperation.cs	Formatting-only adjustments.
ServiceLevelIndicators/src/IEnrichmentContext.cs	Formatting-only adjustments.
ServiceLevelIndicators/src/IEnrichment.cs	Minor formatting/whitespace adjustments.
ServiceLevelIndicators/src/ServiceLevelIndicatorMeterProviderBuilderExtensions.cs	Minor formatting/whitespace adjustments.
ServiceLevelIndicators.Asp/src/ServiceLevelIndicatorMiddleware.cs	Minor formatting + spacing adjustments.
ServiceLevelIndicators.Asp/src/ServiceLevelIndicatorServiceCollectionExtensions.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/src/WebEnrichmentContext.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/src/HttpContextExtensions.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/src/EndpointBuilderExtensions.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/HttpMethodEnrichment.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/src/Enrich.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/src/EnrichAsync.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/src/ServiceLevelIndicatorApplicationBuilderExtensions.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/src/ServiceLevelIndicatorAttribute.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/src/ServiceLevelIndicatorConvention.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/ServiceLevelIndicatorFeature.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/CustomerResourceIdAttribute.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/CustomerResourceIdMetadata.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/IServiceCollectionExtensions.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/IServiceLevelIndicatorBuilder.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/IServiceLevelIndicatorFeature.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/MeasureAttribute.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/src/MeasureMetadata.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/tests/TestHostBuilder.cs	Refactors host builder setup for newer APIs/style.
ServiceLevelIndicators.Asp/tests/TestController.cs	Minor formatting adjustments.
ServiceLevelIndicators.Asp/tests/TestEnrichment.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/tests/IServiceCollectionExtensions.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp/tests/ServiceLevelIndicatorAspTests.cs	Updates HTTP calls to pass xUnit v3 cancellation token; removes xUnit abstractions using.
ServiceLevelIndicators.Asp.ApiVersioning/src/ServiceLevelIndicatorServiceCollectionExtensions.cs	Formatting-only adjustments.
ServiceLevelIndicators.Asp.ApiVersioning/src/ApiVersionEnrichment.cs	Updates Asp.Versioning API usage (extension property).
ServiceLevelIndicators.Asp.ApiVersioning/tests/TestSingleController.cs	Using ordering/formatting changes.
ServiceLevelIndicators.Asp.ApiVersioning/tests/TestNeutralController.cs	Using ordering/formatting changes.
ServiceLevelIndicators.Asp.ApiVersioning/tests/TestDoubleController.cs	Using ordering/formatting changes.
ServiceLevelIndicators.Asp.ApiVersioning/tests/ServiceLevelIndicatorVersionedAspTests.cs	Updates HTTP calls to pass xUnit v3 cancellation token; removes xUnit abstractions using.
sample/GenerateSli/GenerateSli.csproj	Updates target framework to net10.0.
sample/GenerateSli/Program.cs	Trims trailing whitespace/blank lines.
sample/ConsoleApp/SampleConsoleSLI.csproj	Updates target framework to net10.0.
sample/ConsoleApp/Program.cs	Refactors logging setup; minor formatting (and introduces an extra semicolon).
sample/MinApi/Program.cs	Minor whitespace cleanup.
sample/MinApi/UserExt.cs	Minor whitespace/formatting cleanup.
sample/WebApi/Program.cs	Minor formatting-only change.
sample/WebApi/WeatherForecast.cs	Converts to file-scoped namespace and flattens class structure.
sample/WebApi/SampleApiMeters.cs	Converts to file-scoped namespace; formatting cleanup.
sample/WebApi/ConfigureServiceLevelIndicatorOptions.cs	Formatting-only change.
sample/WebApi/Controllers/WeatherForecastController.cs	Refactors GetWeather() to expression-bodied method.
sample/WebApi/Api.http	Adds HTTP scratch file for local testing.
sample/WebApiVersioned/Program.cs	Using re-ordering + fluent chaining refactor.
sample/WebApiVersioned/SampleVersionedWebApplicationSLI.csproj	Suppresses CA1707.
sample/WebApiVersioned/AddApiVersionMetadata.cs	Updates Asp.Versioning deprecation API usage.
sample/WebApiVersioned/ConfigureSwaggerDefaultOptions.cs	Using order cleanup.
sample/WebApiVersioned/Controllers/2023-06-06/HelloWorldController.cs	Formatting-only change.
sample/WebApiVersioned/Api.http	Adds HTTP scratch file for local testing.
sample/DockerOpenTelemetry/run.cmd	Replaces docker-compose setup with Aspire Dashboard container run command.
sample/DockerOpenTelemetry/docker-compose.yaml	Removes docker-compose stack.
sample/DockerOpenTelemetry/otel-collector-config.yaml	Removes OTEL collector config.
sample/DockerOpenTelemetry/prometheus.yaml	Removes Prometheus scrape config.

Comments suppressed due to low confidence (3)

ServiceLevelIndicators/tests/ServiceLevelIndicatorTests.cs:13

• ITestOutputHelper is referenced but there is no using for its namespace in this file. Unless xUnit v3 exposes ITestOutputHelper under the Xunit namespace, this will fail to compile; consider adding the appropriate using (or fully-qualifying / adding a global using for it).
  ServiceLevelIndicators.Asp/tests/ServiceLevelIndicatorAspTests.cs:15
• ITestOutputHelper is used but there is no using for its namespace in this file. If xUnit v3 still keeps ITestOutputHelper in a separate namespace/package, the test project will not compile; add the appropriate using (or a global using) so the type resolves consistently.
  ServiceLevelIndicators.Asp.ApiVersioning/tests/ServiceLevelIndicatorVersionedAspTests.cs:21
• ITestOutputHelper is referenced but there is no using for its namespace in this file. Unless xUnit v3 exposes it directly under Xunit, this will be a compile error; add the appropriate using (or a global using) to keep the tests building.

public class ServiceLevelIndicatorVersionedAspTests : IDisposable
{
    private const int MillisecondsDelay = 200;
    private readonly Meter _meter;
    private readonly MeterListener _meterListener;
    private readonly ITestOutputHelper _output;
    private KeyValuePair<string, object?>[] _actualTags;
    private KeyValuePair<string, object?>[] _expectedTags;
    private bool _callbackCalled;
    private bool _disposedValue;

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[Copilot]

This starts the Aspire dashboard with anonymous/unsecured mode enabled and publishes ports on all interfaces. To reduce the risk of accidental exposure, consider binding the published ports to localhost (e.g., 127.0.0.1:...) and/or adding an inline note in the script that this is for local dev only and should not be used on shared/remote hosts.

[Copilot]

There is an extra trailing semicolon after the service registration chain (.AddSingleton<ServiceLevelIndicator>(); ;). This compiles as an empty statement but should be removed to avoid lint/noise.