Closes #16010: Enable Prometheus middleware only if metrics are enabled

netbox/netbox/settings.py

@@ -372,7 +372,6 @@ if not DJANGO_ADMIN_ENABLED:
 # Middleware
 MIDDLEWARE = [
     "strawberry_django.middlewares.debug_toolbar.DebugToolbarMiddleware",
-    'django_prometheus.middleware.PrometheusBeforeMiddleware',
     'corsheaders.middleware.CorsMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.locale.LocaleMiddleware',
@@ -386,8 +385,14 @@ MIDDLEWARE = [
     'netbox.middleware.RemoteUserMiddleware',
     'netbox.middleware.CoreMiddleware',
     'netbox.middleware.MaintenanceModeMiddleware',
-    'django_prometheus.middleware.PrometheusAfterMiddleware',
 ]
+if METRICS_ENABLED:
+    # If metrics are enabled, add the before & after Prometheus middleware
+    MIDDLEWARE = [
+        'django_prometheus.middleware.PrometheusBeforeMiddleware',
+        *MIDDLEWARE,
+        'django_prometheus.middleware.PrometheusAfterMiddleware',
+    ]
 
 # URLs
 ROOT_URLCONF = 'netbox.urls'