presto-main/src/main/java/io/prestosql/failuredetector/HeartbeatFailureDetector.java/MonitoringTask/isExpired
class MonitoringTask:        public synchronized boolean isExpired()
        {
            return future == null && disabledTimestamp != null && Duration.nanosSince(disabledTimestamp).compareTo(gcGraceInterval) > 0;
        }