diff --git a/jupyterlab_server/app.py b/jupyterlab_server/app.py
index 64529160..5d0a7af2 100644
--- a/jupyterlab_server/app.py
+++ b/jupyterlab_server/app.py
@@ -123,6 +123,14 @@ def initialize_settings(self) -> None:
             immutable_cache.update(extensions_url)
 
         self.settings.update({"static_immutable_cache": list(immutable_cache)})
+        if self.serverapp:
+            untracked_message_types = getattr(
+                self.serverapp.kernel_manager, "untracked_message_types", None
+            )
+            if untracked_message_types:
+                web_app = self.serverapp.web_app
+                page_config_data = web_app.settings.setdefault("page_config_data", {})
+                page_config_data["untracked_message_types"] = list(untracked_message_types)
 
     def initialize_templates(self) -> None:
         """Initialize templates."""
diff --git a/jupyterlab_server/themes_handler.py b/jupyterlab_server/themes_handler.py
index 89f1c826..fc8c7233 100644
--- a/jupyterlab_server/themes_handler.py
+++ b/jupyterlab_server/themes_handler.py
@@ -6,8 +6,9 @@
 
 import os
 import re
+from collections.abc import Generator
 from glob import glob
-from typing import Any, Generator
+from typing import Any
 from urllib.parse import urlparse
 
 from jupyter_server.base.handlers import FileFindHandler
diff --git a/jupyterlab_server/translation_utils.py b/jupyterlab_server/translation_utils.py
index 6d3faf57..cee84752 100644
--- a/jupyterlab_server/translation_utils.py
+++ b/jupyterlab_server/translation_utils.py
@@ -17,7 +17,8 @@
 import sys
 import traceback
 from functools import lru_cache
-from typing import Any, Pattern
+from re import Pattern
+from typing import Any
 
 import babel
 from packaging.version import parse as parse_version
diff --git a/tests/test_labapp.py b/tests/test_labapp.py
index d7e39dd3..e7df291d 100644
--- a/tests/test_labapp.py
+++ b/tests/test_labapp.py
@@ -59,7 +59,10 @@ def ispath(p):
         return p.endswith(("Dir", "Path")) or p == "serverRoot"
 
     nondirs = {k: v for k, v in page_config.items() if not ispath(k)}
-    assert nondirs == {
+    untracked_message_types = getattr(
+        labserverapp.serverapp.kernel_manager, "untracked_message_types", None
+    )
+    expected_nondirs = {
         "appName": "JupyterLab Server Application",
         "appNamespace": "jupyterlab_server",
         "appUrl": "/lab",
@@ -96,6 +99,9 @@ def ispath(p):
         "workspacesApiUrl": "/lab/api/workspaces",
         "wsUrl": "",
     }
+    if untracked_message_types is not None:
+        expected_nondirs["untracked_message_types"] = untracked_message_types
+    assert nondirs == expected_nondirs
 
 
 @pytest.fixture