feat: Add Azure Kusto (ADX) health check

[Copilot]

What does this PR do?

Adds health check support for Azure Kusto (Azure Data Explorer) using the Microsoft.Azure.Kusto.Data SDK.

Core Implementation:

• KustoAvailableHealthCheck - Executes .show databases query via ICslQueryProvider to verify cluster connectivity
• KustoAvailableOptions - Supports both connection string and cluster URI configuration with optional database name and timeout
• KustoAvailableConfigure - Validates configuration (connection string/URI required, timeout >= -1, URI must be absolute)
• DependencyInjectionExtensions.AddKustoAvailability() - Registers health check with default tags azure, kusto, adx

Usage:

builder.Services.AddHealthChecks()
    .AddKustoAvailability("cluster1", options =>
    {
        options.ConnectionString = "https://mycluster.kusto.windows.net";
        options.DatabaseName = "MyDatabase"; // optional
        options.Timeout = 1000; // ms, default 100
    });

Test Coverage:

• Unit tests: DI validation, options validation, configuration binding (14 tests)
• Integration tests: Testcontainers.Kusto with healthy/degraded/unhealthy scenarios (5 tests)

Technical Notes:

• Uses global:: prefix for Kusto namespaces to avoid collision with NetEvolve.HealthChecks.Azure.Kusto namespace
• Static health check method (no instance state required)
• Disposes ICslQueryProvider in finally block

Why is it important?

Azure Kusto is a core data analytics service in Azure. Monitoring cluster connectivity is essential for applications depending on ADX for real-time analytics and telemetry.

Related issues

• Closes #XX

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 172.19.0.1
• analytics.localstack.cloud
  • Triggering command: /opt/code/localstack/.venv/bin/python -m localstack.runtime.main (dns block)
• api.localstack.cloud
• assets.localstack.cloud
• localhost.localstack.cloud
• s3.localhost.localstack.cloud
• sbsfe.0
  • Triggering command: /Eventhubs_Emulator/Microsoft.Cloud.EventHub.Emulator.Host dotnet Microsoft.Cloud.EventHub.Emulator.Host.dll (dns block)
• westus-0.in.applicationinsights.azure.com
  • Triggering command: /home/REDACTED/work/healthchecks/healthchecks/tests/NetEvolve.HealthChecks.Tests.Integration/bin/Debug/net9.0/NetEvolve.HealthChecks.Tests.Integration --internal-msbuild-node /tmp/ebeab8c89f844592849fac9f218b60bd (dns block)
  • Triggering command: /home/REDACTED/work/healthchecks/healthchecks/tests/NetEvolve.HealthChecks.Tests.Integration/bin/Debug/net8.0/NetEvolve.HealthChecks.Tests.Integration --internal-msbuild-node /tmp/3c884d81a05b4689a92ddc37b9856b9f (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>NetEvolve.HealthChecks.Azure.Kusto</issue_title>
<issue_description>### Project Name

Azure.Kusto

Project Description

Contains HealthChecks for Azure.Kusto, based on the nuget packages Microsoft.Azure.Kusto.Data.

TestContainer Package Required?

Yes

TestContainer Package Name

Testcontainers.Kusto

Required NuGet Dependencies

Microsoft.Azure.Kusto.Data

Validation Steps

• Create project structure in src/NetEvolve.HealthChecks.<ProjectName>/
• Add project to solution (dotnet sln HealthChecks.slnx add)
• Add project reference to Test projects
• Add required NuGet packages to Directory.Packages.props
• Follow naming conventions from ADR decisions
• Create README.md based on other projects
• Create unit test folder in tests/NetEvolve.HealthChecks.Tests.Unit/<ProjectName>/
• Create integration test folder in tests/NetEvolve.HealthChecks.Tests.Integration/<ProjectName>/
• Add project reference to the solution file
• Add project reference to existing test projects
• Add TestContainer package if specified
• Restore NuGet packages (dotnet restore HealthChecks.slnx)
• Build the solution (dotnet build HealthChecks.slnx --no-restore)
• Run tests for the new project (dotnet test HealthChecks.slnx --no-build)
• Verify all tests pass successfully (>80% coverage recommended)
• Comment on issue with build/test results
• Create pull request linking to this issue

Additional Notes

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes NetEvolve.HealthChecks.Azure.Kusto #1023

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.