public void run() {
		for (Entry<String, MonitorClientService> each : monitorClientMap.entrySet()) {
			if ((System.currentTimeMillis() - each.getValue().getLastAccessedTime()) > 30000) {
				close(each.getKey());
				LOGGER.info("Remove unused monitor {}", each.getKey());
			}
		}
	}
Delete the unused monitor clients periodically.
ngrinder-controller/src/main/java/org/ngrinder/perftest/service/monitor/MonitorInfoStore.java