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In Django 3.1, django.conf.urls.url() is deprecated in favor of django.urls.re_path(). For more info see [1] These were already replaced in Horizon repo by [2]. [1] https://docs.djangoproject.com/en/4.0/releases/3.1/#id2 [2] https://review.opendev.org/c/openstack/horizon/+/827093 Change-Id: I98bcf28d6a82af7f08978fdecb7f5dc7d02e3972