Add missing mystrom sensor (#113225)

Co-authored-by: TheJulianJES <TheJulianJES@users.noreply.github.com>
Co-authored-by: Franck Nijhof <frenck@frenck.nl>

homeassistant/components/mystrom/sensor.py

@@ -30,6 +30,13 @@ class MyStromSwitchSensorEntityDescription(SensorEntityDescription):
 
 
 SENSOR_TYPES: tuple[MyStromSwitchSensorEntityDescription, ...] = (
+    MyStromSwitchSensorEntityDescription(
+        key="avg_consumption",
+        translation_key="avg_consumption",
+        device_class=SensorDeviceClass.POWER,
+        native_unit_of_measurement=UnitOfPower.WATT,
+        value_fn=lambda device: device.consumedWs,
+    ),
     MyStromSwitchSensorEntityDescription(
         key="consumption",
         device_class=SensorDeviceClass.POWER,

homeassistant/components/mystrom/strings.json

@@ -17,5 +17,12 @@
     "abort": {
       "already_configured": "[%key:common::config_flow::abort::already_configured_device%]"
     }
+  },
+  "entity": {
+    "sensor": {
+      "avg_consumption": {
+        "name": "Average consumption"
+      }
+    }
   }
 }