fix(logger): child logger must respect log level

aws_lambda_powertools/logging/logger.py

@@ -285,7 +285,11 @@ def _init_logger(
         #   b) different sampling mechanisms
         #   c) multiple messages from being logged as handlers can be duplicated
         is_logger_preconfigured = getattr(self._logger, LOGGER_ATTRIBUTE_PRECONFIGURED, False)
-        if self.child or is_logger_preconfigured:
+        if self.child:
+            self.setLevel(log_level)
+            return
+
+        if is_logger_preconfigured:
             return
 
         self.setLevel(log_level)

tests/functional/logger/required_dependencies/test_logger.py

@@ -1217,3 +1217,18 @@ def remove_keys(self, keys: Iterable[str]) -> None:
     # THEN the context keys should not persist
     current_keys = logger.get_current_keys()
     assert current_keys == {}
+
+
+def test_logger_change_level_child_logger(stdout, service_name):
+    # GIVEN a new Logger and child Logger
+    logger = Logger(service=service_name, stream=stdout)
+    child_logger = Logger(service=service_name, child=True, stream=stdout, level="DEBUG")
+
+    # WHEN we emit logs for both in DEBUG level
+    logger.debug("PARENT")
+    child_logger.debug("CHILD")
+
+    # THEN only child log must emit log due to level
+    logs = list(stdout.getvalue().strip().split("\n"))
+    assert len(logs) == 1
+    assert "service" in logs[0]