try this

gizmoguy · gizmoguy · commit 9f35960d476f · 2025-05-22T13:03:00.000+12:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -47,3 +47,6 @@ Documentation = "https://prometheus.github.io/client_python/"
 
 [tool.setuptools.package-data]
 prometheus_client = ['py.typed']
+
+[tool.setuptools.data-files]
+"tests" = ["tests/certs/*"]
