code: public SelfT withLocalDatacenter(@NonNull String profileName, @NonNull String localDatacenter) {
      this.localDatacenters.put(profileName, localDatacenter);
      return self;
    }
docs: Specifies the datacenter that is considered "local" by the load balancing policy.
  
  <p>This is a programmatic alternative to the configuration option {@code
  basic.load-balancing-policy.local-datacenter}. If this method is used, it takes precedence and
  overrides the configuration.
  
  <p>Note that this setting may or may not be relevant depending on the load balancing policy
  implementation in use. The driver's built-in {@code DefaultLoadBalancingPolicy} relies on it;
  if you use a third-party implementation, refer to their documentation.