For JBT 4.1/4.1.1 and JBDS 7.0/7.1, generation of discovery.xml is driven by a separate process, rather than part of the creation of update sites' index.html facades.

So, for the next release of repository-utils, we should consider deprecating or removing this functionality as it's no longer used. At the very least, we could remove the logged warning:

[WARNING] No org.jboss.tools.central.discovery plugin in repo. Skip generation of 'jbosstools-directory.xml'

Need to ensure that JBT 4.0 / JBDS 6.0 builds (and earlier) use a specific (older) version of the mojo, such as 0.16.0.CR2, where this functionality is still required.