Monitor another process with TinyHealthCheck

tinyhealthcheck-complex.cs

public static IHostBuilder CreateHostBuilder(string[] args)
{
    var processStartTime = DateTimeOffset.Now;
    return Host.CreateDefaultBuilder(args)
        .ConfigureServices((hostContext, services) =>
        {
            services.AddSingleton<WorkerStateService>();
            services.AddHostedService<Worker>();
            services.AddCustomTinyHealthCheck<CustomHealthCheck>(config =>
            {
                config.Port = 8082;
                config.UrlPath = "/healthz";
                return config;
            });
        });
}

 public class CustomHealthCheck : IHealthCheck
{
    private readonly ILogger<CustomHealthCheck> _logger;
    private readonly WorkerStateService _workerStateService;
    //IHostedServices cannot be reliably retrieved from the DI collection
    //A secondary stateful service is required in order to get state information out of it

    public CustomHealthCheck(ILogger<CustomHealthCheck> logger, WorkerStateService workerStateService)
    {
        _logger = logger;
        _workerStateService = workerStateService;
    }

    public async Task<HealthCheckResult> Execute(CancellationToken cancellationToken)
    {
        _logger.LogInformation("This is an example of accessing the DI containers for logging. You can access any service that is registered");

        return new HealthCheckResult
        {
            Body = JsonSerializer.Serialize(new
            {
                Status = _workerStateService.IsRunning ? "Healthy!" : "Unhealthy!",
                Iteration = _workerStateService.Iteration,
                IsServiceRunning = _workerStateService.IsRunning,
                ErrorMessage = _workerStateService.IsRunning ? null : "We went over 10 iterations, so the service worker quit!"
            }),
            StatusCode = _workerStateService.IsRunning ? System.Net.HttpStatusCode.OK : System.Net.HttpStatusCode.InternalServerError
        };
    }
}