Introduction

VerneMQ can be monitored in several ways. We implemented native support for Graphite, MQTT $SYS tree, and Prometheus.
The metrics are also available via the command line tool:
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vmq-admin metrics show
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Or with:
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vmq-admin metrics show -d
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Which will output the metrics together with a short description describing what the metric is about. An example looks like:
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# The number of AUTH packets received.
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counter.mqtt_auth_received = 0
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​
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# The number of times a MQTT queue process has been initialized from offline storage.
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counter.queue_initialized_from_storage = 0
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​
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# The number of PUBLISH packets sent.
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counter.mqtt_publish_sent = 10
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​
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# The number of bytes used for storing retained messages.
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gauge.retain_memory = 21184
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Notice that the metrics:
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mqtt_connack_not_authorized_sent
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mqtt_connack_bad_credentials_sent
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mqtt_connack_server_unavailable_sent
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mqtt_connack_identifier_rejected_sent
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mqtt_connack_unacceptable_protocol_sent
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mqtt_connack_accepted_sent
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Are no longer used (always 0) and will be removed in the future. They were replaced with mqtt_connack_sent using the return_code label. For MQTT 5.0 the reason_code label is used instead.
The output on the command line are aggregated by default, but details for a label can be shown as well, for example all metrics with the not_authorized label:
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vmq-admin metrics show --return_code=not_authorized
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counter.mqtt_connack_sent = 0
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All available labels can be show using vmq-admin metrics show --help.

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