@Override
    public void start() {
        isStarted = true;

        log.info(
            "Current configurations after the bootstrap sync." + LINE_SEPARATOR + singleConfigChangeWatcherRegister.toString());

        Executors.newSingleThreadScheduledExecutor()
                 .scheduleAtFixedRate(
                     new RunnableWithExceptionProtection(
                         this::configSync,
                         t -> log.error("Sync config center error.", t)
                     ), 0, syncPeriod, TimeUnit.SECONDS);
    }
Implement Config Watcher register using a periodic sync task.
oap-server/server-configuration/configuration-api/src/main/java/org/apache/skywalking/oap/server/configuration/api/FetchingConfigWatcherRegister.java