Improve log for sum statistics (#55502)

homeassistant/components/sensor/recorder.py

@@ -406,6 +406,19 @@ def compile_statistics(  # noqa: C901
                     and (last_reset := state.attributes.get("last_reset"))
                     != old_last_reset
                 ):
+                    if old_state is None:
+                        _LOGGER.info(
+                            "Compiling initial sum statistics for %s, zero point set to %s",
+                            entity_id,
+                            fstate,
+                        )
+                    else:
+                        _LOGGER.info(
+                            "Detected new cycle for %s, last_reset set to %s (old last_reset %s)",
+                            entity_id,
+                            last_reset,
+                            old_last_reset,
+                        )
                     reset = True
                 elif old_state is None and last_reset is None:
                     reset = True
@@ -420,7 +433,7 @@ def compile_statistics(  # noqa: C901
                 ):
                     reset = True
                     _LOGGER.info(
-                        "Detected new cycle for %s, zero point set to %s (old zero point %s)",
+                        "Detected new cycle for %s, value dropped from %s to %s",
                         entity_id,
                         fstate,
                         new_state,

tests/components/sensor/test_recorder.py

@@ -273,6 +273,9 @@ def test_compile_hourly_sum_statistics_amount(
         ]
     }
     assert "Error while processing event StatisticsTask" not in caplog.text
+    assert "Detected new cycle for sensor.test1, last_reset set to" in caplog.text
+    assert "Compiling initial sum statistics for sensor.test1" in caplog.text
+    assert "Detected new cycle for sensor.test1, value dropped" not in caplog.text
 
 
 @pytest.mark.parametrize("state_class", ["measurement"])
@@ -424,6 +427,9 @@ def test_compile_hourly_sum_statistics_total_increasing(
         ]
     }
     assert "Error while processing event StatisticsTask" not in caplog.text
+    assert "Detected new cycle for sensor.test1, last_reset set to" not in caplog.text
+    assert "Compiling initial sum statistics for sensor.test1" in caplog.text
+    assert "Detected new cycle for sensor.test1, value dropped" in caplog.text
 
 
 @pytest.mark.parametrize(