last_updated virtual attribute documentation added to section state variables

Author: Michael Kaspar

docs/reference.rst

@@ -262,12 +262,13 @@ Here's an example using ``input_number``, assuming it has been configured to cre
    input_number.test.set_value(value=13)
    input_number.test.set_value(13)
 
-Three additional virtual attribute values are available when you use a variable directly as
+Four additional virtual attribute values are available when you use a variable directly as
 ``DOMAIN.entity.attr`` or call ``state.get("DOMAIN.entity.attr")``:
 
 - ``entity_id`` is the DOMAIN.entity as string
 - ``last_changed`` is the last UTC time the state value was changed (not the attributes)
 - ``last_updated`` is the last UTC time the state entity was updated
+- ``last_reported``is the last UTC time the integration set the state of an entity, regardless of whether it changed or not
 
 If you need to compute how many seconds ago the ``binary_sensor.test1`` state changed, you could
 do this: