public void bootedNow(List<ApplicationConfiguration.ModuleConfiguration> configurations, long uptime) {
        bootingStatus.setBooted(true);
        bootingStatus.setUptime(uptime);
        manager.find(TelemetryModule.NAME)
               .provider()
               .getService(MetricsCreator.class)
               .createGauge("uptime", "oap server start up time", MetricsTag.EMPTY_KEY, MetricsTag.EMPTY_VALUE)
               // Set uptime to second
               .setValue(uptime / 1000d);
        this.statusWatchers.forEach(watcher -> watcher.onServerBooted(bootingStatus));
        this.configurations = configurations;
    }
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