Monitoring of director back end nodes

Hello,

When working with director, the state of the backend nodes are not checked by Dovecot. The state always remains as "up". I understand that there are external applications documented that monitor backend nodes, and changes the state of them to "down" if they become unresponsive. The question I have is are there plans to implement something built into Dovecot that would monitor and change states based on backend "health"? Or will it always be dependent on an external service?

Thanks.