This feature was first introduced in Tungsten Dashboard version 1.0.9-61
Prior to version 1.0.9, all cluster definitions had to be located in the
config.php file in the clusters
stanza.
You may now configure cluster definitions by hand or via the GUI.
Using the GUI to define clusters is the recommended best practice as of version 1.0.9
A new configuration path {WEBROOT}/conf.d can be
populated with plain text files in JSON format, one per cluster.
Entries which functioned properly in the config.php
file will work in the {WEBROOT}/conf.d files.
Both the Auto-Define Cluster and Define Cluster GUI worklflows create
files in the {WEBROOT}/conf.d subdirectory.