.newScheduledThreadPool(MAX_CONCURRENCY);
this.config = Atomics.newReference();
this.started = new AtomicBoolean(false);
this.livenessTestFactory = new StandardSshLivenessTestFactory();
this.smtpAlerter = Atomics.newReference();
this.terminationQueue = new TerminationQueue();
this.desiredSize = Atomics.newReference();