The systree functionality is enabled by default and reports the broker metrics at a fixed interval defined in the
vernemq.conf. The metrics defined here are transformed to MQTT topics e.g.
mqtt_publish_received is transformed to
<nodename> is your node's name, as configured in the
vernemq.conf. To find it, you can grep the file for it:
grep nodename vernemq.conf
The complete list of metrics can be found here.
systree_interval = 20000
This option defaults to
If the systree feature is not required it can be disabled in
systree_enabled = off
mosquitto_sub -t '$SYS/<node-name>/#' -u <username> -P <password> -d