conditional-health-checks-policy-registration.cs

 public void ConfigureServices(IServiceCollection services)
{
  services.AddHealthChecks()
    // Specify a typed policy to enable executing a health check
    // This policy could have an exhaustive implementation and
    // reused with other dependencies.
    .AddCheck("MyDependency", () => HealthCheckResult.Healthy())
        .CheckOnlyWhen<FeatureFlagsPolicy>("MyDependency",
            conditionalHealthCheckPolicyCtorArgs: "NewFeature");
}