Prometheus

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

Configuration

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

# Example configuration.yaml entry
prometheus:

Configure Filter

By default, no entity will be excluded. To limit which entities are being exposed to Prometheus, you can use the filter parameter.

# Example filter to include specified domains and exclude specified entities
prometheus:
  filter:
    include_domains:
      - alarm_control_panel
      - light
    include_entity_globs:
      - binary_sensor.*_occupancy
    exclude_entities:
      - light.kitchen_light

Filters are applied as follows:

1. No filter
   • All entities included
2. Only includes
   • Entity listed in entities include: include
   • Otherwise, entity matches domain include: include
   • Otherwise, entity matches glob include: include
   • Otherwise: exclude
3. Only excludes
   • Entity listed in exclude: exclude
   • Otherwise, entity matches domain exclude: exclude
   • Otherwise, entity matches glob exclude: exclude
   • Otherwise: include
4. Domain and/or glob includes (may also have excludes)
   • Entity listed in entities include: include
   • Otherwise, entity listed in entities exclude: exclude
   • Otherwise, entity matches glob include: include
   • Otherwise, entity matches glob exclude: exclude
   • Otherwise, entity matches domain include: include
   • Otherwise: exclude
5. Domain and/or glob excludes (no domain and/or glob includes)
   • Entity listed in entities include: include
   • Otherwise, entity listed in exclude: exclude
   • Otherwise, entity matches glob exclude: exclude
   • Otherwise, entity matches domain exclude: exclude
   • Otherwise: include
6. No Domain and/or glob includes or excludes
   • Entity listed in entities include: include
   • Otherwise: exclude

The following characters can be used in entity globs:

* - The asterisk represents zero, one, or multiple characters ? - The question mark represents a single character

Full Example

Advanced configuration example:

# Advanced configuration.yaml entry
prometheus:
  namespace: hass
  component_config_glob:
    sensor.*_hum:
      override_metric: humidity_percent
    sensor.*_temp:
      override_metric: temperature_c
    sensor.temperature*:
      override_metric: temperature_c
    sensor.*_bat:
      override_metric: battery_percent
  filter:
    include_domains:
      - sensor
    exclude_entity_globs:
      - sensor.weather_*

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']

Replace your.longlived.token with a Home Assistant generated token.

The format to configure the bearer token has changed in Prometheus 2.26, so if you have a newer version, you can use this configuration sample:

# Example Prometheus scrape_configs entry (For version 2.26+
  - job_name: "hass"
    scrape_interval: 60s
    metrics_path: /api/prometheus

    # Long-Lived Access Token
    authorization:
      credentials: "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.

Metrics in unavailable or unknown states

When the Prometheus exporter starts (typically when Home Assistant starts), all non-excluded entities in an unavailable or unknown state are not be exported until they are available again. If the entity goes into state unavailable or unknown again, the value exported will always be the latest known one.

While an entity is in those states, the entity_available corresponding metric is set to 0. This metric can be used to filter out values while the entity is unavailable or in an unknown state thanks to a recording rule.

For example:

- record: "known_temperature_c"
  expr: "temperature_c unless entity_available == 0"