From 066220454f701db60519dc3fc2bcc6a3c443d1a7 Mon Sep 17 00:00:00 2001
From: Jonatan Heyman <jonatan@heyman.info>
Date: Sun, 19 Apr 2020 10:44:08 +0200
Subject: [PATCH] Add disable_existing_logger:False to logging config, to
 prevent suppressing logging messages from loggers that haven't been
 explicitly declared (#1337)

---
 locust/log.py           | 1 +
 locust/test/test_log.py | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/locust/log.py b/locust/log.py
index 79e27e4c55..00b4170639 100644
--- a/locust/log.py
+++ b/locust/log.py
@@ -14,6 +14,7 @@ def setup_logging(loglevel, logfile=None):
     
     LOGGING_CONFIG = {
         "version": 1,
+        "disable_existing_loggers": False,
         "formatters": {
             "default": {
                 "format": "[%(asctime)s] {0}/%(levelname)s/%(name)s: %(message)s".format(HOSTNAME),
diff --git a/locust/test/test_log.py b/locust/test/test_log.py
index 33517f6231..e6cc9fc8bb 100644
--- a/locust/test/test_log.py
+++ b/locust/test/test_log.py
@@ -38,12 +38,15 @@ def test_logging_output(self):
             import logging
             from locust import Locust, task, constant
             
+            custom_logger = logging.getLogger("custom_logger")
+            
             class MyLocust(Locust):
                 wait_time = constant(2)
                 @task
                 def my_task(self):
                     print("running my_task")
                     logging.info("custom log message")
+                    custom_logger.info("test")
         """)) as file_path:
             output = subprocess.check_output([
                 "locust", 
@@ -75,6 +78,11 @@ def my_task(self):
             "%s/INFO/root: custom log message" % socket.gethostname(),
             output,
         )
+        # check that custom message of custom_logger is also printed
+        self.assertIn(
+            "%s/INFO/custom_logger: test" % socket.gethostname(),
+            output,
+        )
     
     def test_skip_logging(self):
         with temporary_file(textwrap.dedent("""