code: public ProxyDataSourceBuilder logSlowQueryToSysOut(long thresholdTime, TimeUnit timeUnit) {
          this.createSysOutSlowQueryListener = true;
          this.slowQueryThreshold = thresholdTime;
          this.slowQueryTimeUnit = timeUnit;
          return this;
      }
docs: Register {@link SystemOutSlowQueryListener}.
  
  @return builder
  @since 1.4.1