diff --git a/pkgs/by-name/pr/pretalx/plugins/openmetrics.nix b/pkgs/by-name/pr/pretalx/plugins/openmetrics.nix
new file mode 100644
index 000000000000..ebf021068bd1
--- /dev/null
+++ b/pkgs/by-name/pr/pretalx/plugins/openmetrics.nix
@@ -0,0 +1,40 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  setuptools,
+  unstableGitUpdater,
+}:
+
+buildPythonPackage {
+  pname = "pretalx-openmetrics";
+  version = "unstable-2025-05-25";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "why2025-datenzone";
+    repo = "pretalx-openmetrics";
+    rev = "1121a5d430c403bc9aedb7ae8b1aa81219c8a58f";
+    hash = "sha256-reQA61JFZsYWE/CAL28Oe60CmGANt0phXLzz9YGtDYQ=";
+  };
+
+  build-system = [
+    setuptools
+  ];
+
+  doCheck = false; # no tests
+
+  pythonImportsCheck = [
+    "pretalx_openmetrics"
+  ];
+
+  # no tagged release yet
+  passthru.updateScript = unstableGitUpdater { };
+
+  meta = {
+    description = "OpenMetrics instrumentation plugin";
+    homepage = "https://github.com/why2025-datenzone/pretalx-openmetrics";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ hexa ];
+  };
+}