public SLSWebApp(SchedulerWrapper wrapper, int metricsAddressPort) {
   this.wrapper = wrapper;
   metrics = wrapper.getMetrics();
   handleOperTimecostHistogramMap = new HashMap<SchedulerEventType, Histogram>();
   queueAllocatedMemoryCounterMap = new HashMap<String, Counter>();
   queueAllocatedVCoresCounterMap = new HashMap<String, Counter>();
   schedulerMetrics = wrapper.getSchedulerMetrics();
   port = metricsAddressPort;
 }