A new activity widget for site administrators was added to the HQ dashboard in Hubzilla version 11.2. It shows some vital stats about the system, and is updated periodically. It is only visible to administrators of the hub, and will be enhanced further in coming releases.
The new System Status widget in the Hubzilla HQ dashboard.
A new URL endpoint (/perfstats) was also introduced to allow external monitoring tools to
get the information for display in external dashboards. Again this is only available for authenticated requests with administrator privileges. It will return the information in a pretty straigh forward json format.
This work was done as part of my work on Hubzilla performance profiling sponsored by the NLnet NGI0 Commons fund.