code: public void start() throws Exception {
          Exceptions.checkNotClosed(this.closed, this);
  
          log.info("Initializing metrics provider ...");
          MetricsProvider.initialize(builderConfig.getConfig(MetricsConfig::builder));
          statsProvider = MetricsProvider.getMetricsProvider();
          statsProvider.start();
  
          log.info("Initializing ZooKeeper Client ...");
          this.zkClient = createZKClient();
  
          log.info("Initializing Service Builder ...");
          this.serviceBuilder.initialize();
  
          log.info("Creating StreamSegmentService ...");
          StreamSegmentStore service = this.serviceBuilder.createStreamSegmentService();
  
          log.info("Creating TableStoreService ...");
          TableStore tableStoreService = this.serviceBuilder.createTableStoreService();
  
          log.info("Creating Segment Stats recorder ...");
          autoScaleMonitor = new AutoScaleMonitor(service, builderConfig.getConfig(AutoScalerConfig::builder));
  
          TokenVerifierImpl tokenVerifier = new TokenVerifierImpl(builderConfig.getConfig(AutoScalerConfig::builder));
  
          // Log the configuration
          log.info(serviceConfig.toString());
          log.info(builderConfig.getConfig(AutoScalerConfig::builder).toString());
  
          this.listener = new PravegaConnectionListener(this.serviceConfig.isEnableTls(), this.serviceConfig.getListeningIPAddress(),
                                                        this.serviceConfig.getListeningPort(), service, tableStoreService,
                                                        autoScaleMonitor.getStatsRecorder(), autoScaleMonitor.getTableSegmentStatsRecorder(),
                                                        tokenVerifier, this.serviceConfig.getCertFile(), this.serviceConfig.getKeyFile(),
                                                        this.serviceConfig.isReplyWithStackTraceOnError());
  
          this.listener.startListening();
          log.info("PravegaConnectionListener started successfully.");
          log.info("StreamSegmentService started.");
      }
docs: region Service Operation