MQTT: Broker messages
This check monitors message related statistics of a MQTT broker instance.
It shows the number of currently retained messages active on the broker.
The number of bytes currently held by message payloads in the message store
of the broker and the number of currently held messages in the message store.
Besides these values displaying the current state, it also shows the number
and size of sent and received messages. It also shows these numbers separately
for PUBLISH messages and the number of CONNECT messages received.
To make this check work you have to configure the special agent
which connects via MQTT to the broker to gather information from the
This check has been developed with Mosquitto message broker but might also work
with other brokers. The available values vary from broker to broker and from
version to version.
Please note that this check may only be useful if you connect it directly to a
broker. In case you want to monitor a multi-tentant cluster, this check is
only useful if configure it for each node since the
$SYS/ topic is is node
specific. It is not useful to use this check through a load balancer.
The check is always
The instance ID configured in the special agent.
One service is created for each instance.