Add entity category to roomba (#58362)

homeassistant/components/roomba/sensor.py

@@ -1,7 +1,11 @@
 """Sensor for checking the battery level of Roomba."""
 from homeassistant.components.sensor import SensorEntity
 from homeassistant.components.vacuum import STATE_DOCKED
-from homeassistant.const import DEVICE_CLASS_BATTERY, PERCENTAGE
+from homeassistant.const import (
+    DEVICE_CLASS_BATTERY,
+    ENTITY_CATEGORY_DIAGNOSTIC,
+    PERCENTAGE,
+)
 from homeassistant.helpers.icon import icon_for_battery_level
 
 from .const import BLID, DOMAIN, ROOMBA_SESSION
@@ -20,6 +24,8 @@ async def async_setup_entry(hass, config_entry, async_add_entities):
 class RoombaBattery(IRobotEntity, SensorEntity):
     """Class to hold Roomba Sensor basic info."""
 
+    _attr_entity_category = ENTITY_CATEGORY_DIAGNOSTIC
+
     @property
     def name(self):
         """Return the name of the sensor."""