public ActiveHealthCheckMonitor(
IOptions <ActiveHealthCheckMonitorOptions> monitorOptions,
IEnumerable <IActiveHealthCheckPolicy> policies,
IProbingRequestFactory probingRequestFactory,
ITimerFactory timerFactory,
ILogger <ActiveHealthCheckMonitor> logger)
{
_monitorOptions = monitorOptions?.Value ?? throw new ArgumentNullException(nameof(monitorOptions));
_policies = policies?.ToDictionaryByUniqueId(p => p.Name) ?? throw new ArgumentNullException(nameof(policies));
_probingRequestFactory = probingRequestFactory ?? throw new ArgumentNullException(nameof(probingRequestFactory));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
_scheduler = new EntityActionScheduler <ClusterInfo>(cluster => ProbeCluster(cluster), autoStart: false, runOnce: false, timerFactory);
}