| description |
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Description and Configuration of the $SYSTree Monitoring Feature |
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 $SYS/<nodename>/mqtt/publish/received. <nodename> is your node's name, as configured in the vernemq.conf. To find it, you can grep the file for it: grep nodename vernemq.conf
The complete list of metrics can be found here.
systree_interval = 20000
This option defaults to 20000 milliseconds.
If the systree feature is not required it can be disabled in vernemq.conf
systree_enabled = off
{% hint style="success" %}
The feature and the interval can be changed at runtime using the vmq-admin script.
Usage: vmq-admin set = ... [[--node | -n] | --all]
Example: vmq-admin set systree_interval=60000 -n [email protected]
{% endhint %}
Examples:
mosquitto_sub -t '$SYS/<node-name>/#' -u <username> -P <password> -d