From e22cb3521eec98d62a479d0c86da19a931f32f81 Mon Sep 17 00:00:00 2001
From: Turan Almammadov <16321061+turanalmammadov@users.noreply.github.com>
Date: Wed, 4 Mar 2026 00:58:17 +0400
Subject: [PATCH] fix: improve log messages when no plugins are loaded

Previously, when no plugins were present in the plugins folder, the
loading summary log was identical to a successful load. This made it
hard to distinguish between an empty plugin directory and errors.

Changes:
- When import_errors exist: emit a WARNING listing all failing plugin
  paths so operators can quickly see what broke
- When no plugins and no errors: emit a clear DEBUG message indicating
  the plugins folder is empty / contains no Airflow plugins
- When plugins are loaded successfully: keep the existing debug timing
  message

Closes #56816

Made-with: Cursor
---
 airflow-core/src/airflow/plugins_manager.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/airflow-core/src/airflow/plugins_manager.py b/airflow-core/src/airflow/plugins_manager.py
index 6e2b94330d677..5b62aeebd7a2e 100644
--- a/airflow-core/src/airflow/plugins_manager.py
+++ b/airflow-core/src/airflow/plugins_manager.py
@@ -128,7 +128,16 @@ 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(s): %s",
+            len(import_errors),
+            list(import_errors.keys()),
+        )
+    elif not plugins:
+        log.debug("No plugins loaded (plugins folder is empty or contains no Airflow plugins)")
+    else:
+        log.debug("Loading %d plugin(s) took %.2f ms", len(plugins), timer.duration)
     return plugins, import_errors