Add state class to Eliqonline (#52111)

homeassistant/components/eliqonline/sensor.py

@@ -6,7 +6,11 @@ import logging
 import eliqonline
 import voluptuous as vol
 
-from homeassistant.components.sensor import PLATFORM_SCHEMA, SensorEntity
+from homeassistant.components.sensor import (
+    PLATFORM_SCHEMA,
+    STATE_CLASS_MEASUREMENT,
+    SensorEntity,
+)
 from homeassistant.const import CONF_ACCESS_TOKEN, CONF_NAME, POWER_WATT
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 import homeassistant.helpers.config_validation as cv
@@ -54,6 +58,8 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
 class EliqSensor(SensorEntity):
     """Implementation of an ELIQ Online sensor."""
 
+    _attr_state_class = STATE_CLASS_MEASUREMENT
+
     def __init__(self, api, channel_id, name):
         """Initialize the sensor."""
         self._name = name