public AvailabilityLog AppendLog(int statusCode, string body, long responseTime) { if (AvailabilityLogs is null) { AvailabilityLogs = new List <AvailabilityLog>(); } var availabilityLog = new AvailabilityLog(DateTime.UtcNow, statusCode, body, responseTime); AvailabilityLogs.Add(availabilityLog); return(availabilityLog); }