code: public WeakCounterConfigurationBuilder concurrencyLevel(int level) {
        attributes.attribute(WeakCounterConfiguration.CONCURRENCY_LEVEL).set(level);
        return self();
     }
docs: Sets the counter's concurrency level.
  <p>
  It sets the number of concurrent updates in the counter. A higher value will support a higher number of updates
  but it increases the read of the counter's value.
  <p>
  Default value is 16.
  
  @param level the new concurrency level.