presto-resource-group-managers/src/main/java/io/prestosql/plugin/resourcegroups/db/DbResourceGroupConfigurationManager.java/DbResourceGroupConfigurationManager/start
class DbResourceGroupConfigurationManager:    @PostConstruct
    public void start()
    {
        if (started.compareAndSet(false, true)) {
            configExecutor.scheduleWithFixedDelay(this::load, 1, 1, TimeUnit.SECONDS);
        }
    }