# $SYSTree

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](https://docs.vernemq.com/1.12.3/monitoring/introduction) 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.](https://docs.vernemq.com/1.12.3/monitoring/introduction)

```
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 VerneMQ@127.0.0.1`
{% endhint %}

Examples:

```
mosquitto_sub -t '$SYS/<node-name>/#' -u <username> -P <password> -d
```