message: test: destory instance
diff: @@ -370,6 +370,7 @@ export class MetricsServerManager extends AbstractIndicator implements MetricsMa
  for (let client of this.metricsClients.values()) {
  client.close();
  }
  + MetricsServerManager.instance = null;
  }
  getNewMetricRegistry(): IMetricsRegistry {
  