MQTT-exporter

Description

Simple and generic Prometheus exporter for MQTT. Tested with Mosquitto MQTT and Xiaomi sensors.

It exposes metrics from MQTT message out of the box (you just need to specify the target if not on localhost).

MQTT-exporter expects a topic and a flat JSON payload, the value must be numeric values.

It also provides message counters for each MQTT topic (since PR #5):

mqtt_message_total{instance="mqtt-exporter:9000", job="mqtt-exporter", topic="zigbee2mqtt_0x00157d00032b1234"} 10

Tested devices

Note: This exporter aims to be as generic as possible. If the sensor you use is using the following format, it will work:

topic '<prefix>/<name>', payload '{"temperature":26.24,"humidity":45.37}'

Also, the Shelly format is supported:

topic '<prefix>/<name>/sensor/temperature' '20.00'

The exporter is tested with:

Aqara/Xiaomi sensors (WSDCGQ11LM and VOCKQJK11LM)
SONOFF sensors (SNZB-02)
Shelly sensors (H&T wifi)

Metrics conversion example

topic 'zigbee2mqtt/0x00157d00032b1234', payload '{"temperature":26.24,"humidity":45.37}'

will be converted as:

mqtt_temperature{topic="zigbee2mqtt_0x00157d00032b1234"} 25.24
mqtt_humidity{topic="zigbee2mqtt_0x00157d00032b1234"} 45.37

Configuration

Parameters are passed using environment variables.

The list of parameters are:

LOG_LEVEL: Logging level (default: INFO)
MQTT_IGNORED_TOPICS: Comma-separated lists of topics to ignore. Accepts wildcards. (default: None)
MQTT_ADDRESS: IP or hostname of MQTT broker (default: 127.0.0.1)
MQTT_PORT: TCP port of MQTT broker (default: 1883)
MQTT_TOPIC: Topic path to subscribe to (default: #)
MQTT_KEEPALIVE: Keep alive interval to maintain connection with MQTT broker (default: 60)
MQTT_USERNAME: Username which should be used to authenticate against the MQTT broker (default: None)
MQTT_PASSWORD: Password which should be used to authenticate against the MQTT broker (default: None)
PROMETHEUS_PORT: HTTP server PORT to expose Prometheus metrics (default: 9000)
PROMETHEUS_PREFIX: Prefix added to the metric name, example: mqtt_temperature (default: mqtt_)
TOPIC_LABEL: Define the Prometheus label for the topic, example temperature{topic="device1"} (default: topic)

Deployment

Using Docker

With an interactive shell:

docker run -it -p 9000:9000 -e "MQTT_ADDRESS=192.168.0.1" kpetrem/mqtt-exporter

If you need the container to start on system boot (e.g. on your server/Raspberry Pi):

docker run -d -p 9000:9000 --restart unless-stopped --name mqtt-exporter  -e "MQTT_ADDRESS=192.168.0.1" kpetrem/mqtt-exporter

Using Docker Compose

version: "3"
services:
  mqtt-exporter:
    image: kpetrem/mqtt-exporter
    ports:
      - 9000:9000
    environment:
      - MQTT_ADDRESS=192.168.0.1
    restart: unless-stopped

Using Python

pip install -r requirements/base.txt
MQTT_ADDRESS=192.168.0.1 python exporter.py

Get the metrics on Prometheus

See below an example of Prometheus configuration to scrape the metrics:

scrape_configs:
  - job_name: mqtt-exporter
    static_configs:
      - targets: ["mqtt-exporter:9000"]

Nicer metrics

If you want nicer metrics, you can configure mqtt-exporter in your docker-compose.yml as followed:

version: "3"
services:
  mqtt-exporter:
    image: kpetrem/mqtt-exporter
    ports:
      - 9000:9000
    environment:
      - MQTT_ADDRESS=192.168.0.1
      - PROMETHEUS_PREFIX=sensor_
      - TOPIC_LABEL=sensor
    restart: unless-stopped

Result:

sensor_temperature{sensor="zigbee2mqtt_bedroom"} 22.3

And then remove zigbee2mqtt_ prefix from sensor label via Prometheus configuration:

scrape_configs:
  - job_name: mqtt-exporter
    static_configs:
      - targets: ["mqtt-exporter:9000"]
    metric_relabel_configs:
      - source_labels: [sensor]
        regex: 'zigbee2mqtt_(.*)'
        replacement: '$1'
        target_label: sensor

Result:

sensor_temperature{sensor=bedroom"} 22.3

Contribute

Dev environment

You can install invoke package on your system and then use it to install environement, run an autoformat or just run the exporter:

invoke install: to install virtualenv under .venv/ and install all dev requirements
invoke reformat: reformat using black and isort
invoke start: start the app

Coding style

Please ensure you have run the following before pushing a commit:

black and isort (or invoke reformat)
pylama to run all linters

Follow usual best practices:

document your code (inline and docstrings)
constant are in upper case
use comprehensible variable name
one function = one purpose
function name should define perfectly its purpose

roobre/mqtt-exporter