The PubSub Server Info plugin provides a way for Openfire to report statistics about itself in a well-known pub-sub node: 'serverinfo'. The data format is defined in XEP-0485: PubSub Server Info.
This plugin is what could be used by applications such as the XMPP Network Graph
Copy pubsubserverinfo.jar into the plugins directory of your Openfire installation. The plugin will then be automatically deployed. To upgrade to a new version, copy the new pubsubserverinfo.jar file over the existing file.
Issues may be reported to the forums or via this repo's Github Issues.