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Deprecate invalid use of sensor unit of measurement and state class

· One min read
Jan-Philipp Benecke
Jan-Philipp Benecke

Since Home Assistant Core 2022.12, a warning is issued in the logs if a sensor entity that has a device class uses unit of measurement and state class incorrectly, taking their device class into account.

An invalid use would be a sensor entity that has a device class of SensorDeviceClass.TEMPERATURE but uses the unit of measurement % instead of °C or °F; or the state class SensorStateClass.TOTAL instead of SensorStateClass.MEASUREMENT.

There will be a six-month deprecation period to ensure all custom integration authors have time to adjust. As of Home Assistant Core 2024.8, the warning will then be replaced by an exception.