home-assistant.io/source/_components/prometheus.markdown

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The prometheus component exposes metrics in a format which Prometheus can read.

To use the prometheus component in your installation, add the following to your configuration.yaml file:

# Example configuration.yaml entry
prometheus:

{% configuration %} namespace: description: The "namespace" that will be assigned to all the Prometheus metrics. This is the prefix of the metric name. E.g., having myhass as the namespace will cause the device tracker metrics to be myhass_device_tracker_state, the switch metrics to be myhass_switch_state and so on. The default is to not add any prefix to the metrics name. (available in version 0.73.0 and later) required: false type: string filter: description: Filtering directives for the components which should be included or excluded from recording. required: false type: list keys: exclude: description: Excluded from recording. required: false type: list keys: entities: description: The list of entity ids to be excluded from recording. required: false type: list domains: description: The list of domains to be excluded from recording. required: false type: list include: description: Included in recordings. If set, all other entities will not be recorded. Values set by the exclude option will prevail. required: false type: list keys: entities: description: The list of entity ids to be included from recordings. required: false type: list domains: description: The list of domains to be included from recordings. required: false type: list {% endconfiguration %}

You can then configure Prometheus to fetch metrics from Home Assistant by adding to its scrape_configs configuration.

# Example Prometheus scrape_configs entry
  - job_name: 'hass'
    scrape_interval: 60s
    metrics_path: /api/prometheus

    # Legacy api password
    params:
      api_password: ['PASSWORD']

    # Long-Lived Access Token
    bearer_token: 'your.longlived.token'

    scheme: https
    static_configs:
      - targets: ['HOSTNAME:8123']

When looking into the metrics on the Prometheus side, there will be:

• All Home Assistant domains, which can be easily found through the common namespace prefix, if defined.
• The client library provided metrics, which are a bunch of process_* and also a single pseudo-metric python_info which contains (not as value but as labels) information about the Python version of the client, i.e., the Home Assistant Python interpreter.

Typically, you will only be interested in the first set of metrics.