Filter MQTT sensor JSON attributes (#52289)

homeassistant/components/mqtt/sensor.py

@@ -44,6 +44,13 @@ CONF_LAST_RESET_TOPIC = "last_reset_topic"
 CONF_LAST_RESET_VALUE_TEMPLATE = "last_reset_value_template"
 CONF_STATE_CLASS = "state_class"
 
+MQTT_SENSOR_ATTRIBUTES_BLOCKED = frozenset(
+    {
+        sensor.ATTR_LAST_RESET,
+        sensor.ATTR_STATE_CLASS,
+    }
+)
+
 DEFAULT_NAME = "MQTT Sensor"
 DEFAULT_FORCE_UPDATE = False
 PLATFORM_SCHEMA = mqtt.MQTT_RO_PLATFORM_SCHEMA.extend(
@@ -87,6 +94,7 @@ class MqttSensor(MqttEntity, SensorEntity):
     """Representation of a sensor that can be updated using MQTT."""
 
     _attr_last_reset = None
+    _attributes_extra_blocked = MQTT_SENSOR_ATTRIBUTES_BLOCKED
 
     def __init__(self, hass, config, config_entry, discovery_data):
         """Initialize the sensor."""