Prometheus

A lot of applications (checkout the list of applications) have an endpoint which can be used to query metrics.

If they aren't specificly made for prometheus you can write an exporter to make them prometheus compatible (e.g. for nextcloud, jitsi).

Simply add the prometheus service definition to the docker-compose.yml, in which the monitoring services are defined.

  prometheus:
    image: prom/prometheus
    restart: always
    volumes:
      - '/srv/main/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml'
      - 'prometheus-data:/prometheus'
    networks:
      - monitoring

# ...

volumes:
  prometheus-data:

The prometheus.yml contain a list of metrics endpoints, that should be queried:

global:
  scrape_interval:     15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    static_configs:
    - targets: ['localhost:9090']

  # query jitsi statistics
  - job_name: 'jitsi'
    static_configs:
      - targets: ['jitsi2prometheus:8080']

  # query traefik statistics
  - job_name: 'traefik'
    static_configs:
      - targets: ['traefik:8080']

In some services (e.g. jitsi and traefik) you may find these "Enable Exports" tutorials, but I didn't add them for every service!

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Last update: 2022-01-09