diff --git a/openedx/core/lib/celery/routers.py b/openedx/core/lib/celery/routers.py
index c8f6b4196b..5018b9d1ef 100644
--- a/openedx/core/lib/celery/routers.py
+++ b/openedx/core/lib/celery/routers.py
@@ -5,6 +5,9 @@ For more, see http://celery.readthedocs.io/en/latest/userguide/routing.html#rout
 """
 from abc import ABCMeta, abstractproperty
 from django.conf import settings
+import logging
+
+log = logging.getLogger(__name__)
 
 
 class AlternateEnvironmentRouter(object):
@@ -30,6 +33,13 @@ class AlternateEnvironmentRouter(object):
         If None is returned from this method, default routing logic is used.
         """
         alternate_env = self.alternate_env_tasks.get(task, None)
+        if 'update_course_in_cache' in task:
+            log.info("TNL-5408: task={task}, args={args}, alternate_env={alt_env}, queues={queues}".format(
+                task=task,
+                args=args,
+                alt_env=alternate_env,
+                queues=getattr(settings, 'CELERY_QUEUES', []).keys()
+            ))
         if alternate_env:
             return self.ensure_queue_env(alternate_env)
         return None