fix(logging): tag keboola-owned handlers; only remove those in set_default_logger

.github/workflows/push.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.14"]
+        python-version: ["3.10", "3.14"]
 
     steps:
       - name: Checkout 🛒

src/keboola/component/interface.py

@@ -160,18 +160,22 @@ def filter(self, rec):
 
         hd1 = logging.StreamHandler(sys.stdout)
         hd1.addFilter(InfoFilter())
+        hd1._keboola_owned = True
         hd2 = logging.StreamHandler(sys.stderr)
         hd2.setLevel(logging.WARNING)
+        hd2._keboola_owned = True
 
-        logging.getLogger().setLevel(log_level)
-        # remove default handler
-        for h in logging.getLogger().handlers:
-            logging.getLogger().removeHandler(h)
-        logging.getLogger().addHandler(hd1)
-        logging.getLogger().addHandler(hd2)
+        root = logging.getLogger()
+        root.setLevel(log_level)
+        # Remove only handlers previously installed by keboola.component, leaving
+        # any external handlers (e.g. test infrastructure) untouched.
+        for h in list(root.handlers):
+            if getattr(h, "_keboola_owned", False):
+                root.removeHandler(h)
+        root.addHandler(hd1)
+        root.addHandler(hd2)
 
-        logger = logging.getLogger()
-        return logger
+        return root
 
     @staticmethod
     def set_gelf_logger(
@@ -192,9 +196,11 @@ def set_gelf_logger(
 
         Returns: Logger object
         """
-        # remove existing handlers
-        for h in logging.getLogger().handlers:
-            logging.getLogger().removeHandler(h)
+        # Remove only handlers previously installed by keboola.component.
+        root = logging.getLogger()
+        for h in list(root.handlers):
+            if getattr(h, "_keboola_owned", False):
+                root.removeHandler(h)
         if stdout:
             CommonInterface.set_default_logger(log_level)
 
@@ -210,6 +216,7 @@ def set_gelf_logger(
         else:
             raise ValueError(f"Unsupported gelf transport layer: {transport_layer}. Choose TCP or UDP")
 
+        gelf._keboola_owned = True
         logging.getLogger().setLevel(log_level)
         logging.getLogger().addHandler(gelf)