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Document RestoreSensor (#1209)

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Erik Montnemery 2022-02-09 14:33:26 +01:00 committed by GitHub
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docs/core/entity/sensor.md
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@ -66,6 +66,11 @@ If specifying a device class, your sensor entity will need to also return the co
| total_increasing | Similar to `total`, with the restriction that the state represents a monotonically increasing positive total, e.g. a daily amount of consumed gas, weekly water consumption or lifetime energy consumption. Statistics of the accumulated growth of the sensor's value since it was first added is updated every 5 minutes.
## Restoring sensor states
Sensors which restore the state after restart or reload should not extend `RestoreEntity` because that does not store the `native_value`, but instead the `state` which may have been modifed by the sensor base entity. Sensors which restore the state should extend `RestoreSensor` and call `await self.async_get_last_sensor_data` from `async_added_to_hass` to get access to the stored `native_value` and `native_unit_of_measurement`.
## Long-term Statistics
Home Assistant has support for storing sensors as long-term statistics if the entity has