Filter out duplicate logbook states (#32427)

homeassistant/components/logbook/__init__.py

@@ -199,6 +199,9 @@ def humanify(hass, events):
     """
     domain_prefixes = tuple(f"{dom}." for dom in CONTINUOUS_DOMAINS)
 
+    # Track last states to filter out duplicates
+    last_state = {}
+
     # Group events in batches of GROUP_BY_MINUTES
     for _, g_events in groupby(
         events, lambda event: event.time_fired.minute // GROUP_BY_MINUTES
@@ -236,9 +239,15 @@ def humanify(hass, events):
         # Yield entries
         for event in events_batch:
             if event.event_type == EVENT_STATE_CHANGED:
-
                 to_state = State.from_dict(event.data.get("new_state"))
 
+                # Filter out states that become same state again (force_update=True)
+                # or light becoming different color
+                if last_state.get(to_state.entity_id) == to_state.state:
+                    continue
+
+                last_state[to_state.entity_id] = to_state.state
+
                 domain = to_state.domain
 
                 # Skip all but the last sensor state

tests/components/logbook/test_init.py

@@ -1484,3 +1484,36 @@ async def test_humanify_script_started_event(hass):
     assert event2["domain"] == "script"
     assert event2["message"] == "started"
     assert event2["entity_id"] == "script.bye"
+
+
+async def test_humanify_same_state(hass):
+    """Test humanifying Script Run event."""
+    state_50 = ha.State("light.kitchen", "on", {"brightness": 50}).as_dict()
+    state_100 = ha.State("light.kitchen", "on", {"brightness": 100}).as_dict()
+    state_200 = ha.State("light.kitchen", "on", {"brightness": 200}).as_dict()
+
+    events = list(
+        logbook.humanify(
+            hass,
+            [
+                ha.Event(
+                    EVENT_STATE_CHANGED,
+                    {
+                        "entity_id": "light.kitchen",
+                        "old_state": state_50,
+                        "new_state": state_100,
+                    },
+                ),
+                ha.Event(
+                    EVENT_STATE_CHANGED,
+                    {
+                        "entity_id": "light.kitchen",
+                        "old_state": state_100,
+                        "new_state": state_200,
+                    },
+                ),
+            ],
+        )
+    )
+
+    assert len(events) == 1