Basic IHealthCheck implementation that injects chaos

ChaosHealthCheck.cs

using System;
using System.Threading;
using System.Threading.Tasks;
using Polly.Contrib.Simmy;
using Polly.Contrib.Simmy.Outcomes;
using Microsoft.Extensions.Diagnostics.HealthChecks;
using CSharpx;

sealed class ChaosHealthCheck : IHealthCheck
{
    readonly MonkeyPolicy _faultPolicy;
    readonly Random _random = new CryptoRandom();
    readonly double _raiseInjection;

    public ChaosHealthCheck(double faultInjection, double raiseInjection)
    {
        _faultPolicy = MonkeyPolicy.InjectException(with =>
            with.Fault(new Exception("Something gone wrong."))
                .InjectionRate(faultInjection)
                .Enabled());
        _raiseInjection = raiseInjection;
    }

    public Task<HealthCheckResult> CheckHealthAsync(
        HealthCheckContext context, CancellationToken cancellationToken = default(CancellationToken))
    {
        var outcome = _faultPolicy.ExecuteAndCapture(() => HealthCheckResult.Healthy());
        return (outcome.FinalException == null) switch
            {
                false => (_random.NextDouble() < _raiseInjection) switch
                {
                    false => Task.FromResult(HealthCheckResult.Unhealthy()),
                    _ => throw outcome.FinalException
                },
                _ => Task.FromResult(outcome.Result)
            };
    }
}