public void MuteDeadLetters(ActorSystem system = null, params Type[] messageClasses)
{
if (system == null) system = Sys;
if (!system.Log.IsDebugEnabled)
{
if (messageClasses.Any())
foreach (var @class in messageClasses) EventFilter.DeadLetter(@class).Mute();
else EventFilter.DeadLetter(typeof(object)).Mute();
}
}