Distinguish empty plugin folder from plugin load failures in logs

airflow-core/src/airflow/plugins_manager.py

@@ -133,7 +133,16 @@ def __register_plugins(plugin_instances: list[AirflowPlugin], errors: dict[str,
         if not settings.LAZY_LOAD_PROVIDERS:
             __register_plugins(*_load_providers_plugins())
 
-    log.debug("Loading %d plugin(s) took %.2f ms", len(plugins), timer.duration)
+    if import_errors:
+        log.warning(
+            "Failed to load %d plugin file(s): %s",
+            len(import_errors),
+            sorted(import_errors.keys()),
+        )
+    elif not plugins:
+        log.debug("No plugins loaded (plugins folder is empty or contains no valid plugins)")
+    else:
+        log.debug("Loading %d plugin(s) took %.2f ms", len(plugins), timer.duration)
     return plugins, import_errors
 
 

airflow-core/tests/unit/plugins/test_plugins_manager.py

@@ -91,6 +91,28 @@ def test_loads_filesystem_plugins(self, caplog):
 
         assert [r for r in caplog.record_tuples if not r[0].startswith("opentelemetry.")] == []
 
+    def test_empty_plugins_folder_logs_no_failure(self, caplog, tmp_path):
+        from airflow import plugins_manager
+
+        with (
+            caplog.at_level(logging.DEBUG, logger="airflow.plugins_manager"),
+            conf_vars(
+                {
+                    ("core", "plugins_folder"): os.fspath(tmp_path),
+                    ("core", "load_examples"): "False",
+                }
+            ),
+            mock.patch("airflow.plugins_manager._load_entrypoint_plugins", return_value=([], [])),
+            mock.patch("airflow.plugins_manager._load_providers_plugins", return_value=([], [])),
+        ):
+            plugins, import_errors = plugins_manager._get_plugins()
+
+        assert plugins == []
+        assert import_errors == {}
+        received_logs = caplog.text
+        assert "Failed to load" not in received_logs
+        assert "No plugins loaded" in received_logs
+
     def test_loads_filesystem_plugins_exception(self, caplog, tmp_path):
         from airflow import plugins_manager
 
@@ -108,6 +130,7 @@ def test_loads_filesystem_plugins_exception(self, caplog, tmp_path):
 
         received_logs = caplog.text
         assert "Failed to load plugin" in received_logs
+        assert "Failed to load 1 plugin file(s)" in received_logs
         assert "testplugin.py" in received_logs
 
     def test_duplicate_plugin_name_does_not_prevent_loading_subsequent_plugins(self):