public void rebalancedCluster(long rebalancedTime) {
        clusterStatus.setRebalancedTime(rebalancedTime);
        manager.find(TelemetryModule.NAME)
               .provider()
               .getService(MetricsCreator.class)
               .createGauge(
                   "cluster_rebalanced_time", "oap cluster rebalanced time after scale", MetricsTag.EMPTY_KEY,
                   MetricsTag.EMPTY_VALUE
               )
               .setValue(rebalancedTime / 1000d);

        this.statusWatchers.forEach(watcher -> watcher.onClusterRebalanced(clusterStatus));
    }
The server status service provides the indicators for the current server status.
Notice, this should not be treated as a kind of health checker or self telemetry.
For more, this helps modules to be aware of current OAP server status.

@since 9.4.0
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/status/ServerStatusService.java