From 6a1563de121d1d8db4c12b28b3fc8ab36c6157a1 Mon Sep 17 00:00:00 2001
From: Yucheng He <yucheng@berri.ai>
Date: Sat, 5 Sep 2026 08:50:52 -0700
Subject: [PATCH] fix(otel): avoid mutable field-set construction

---
 litellm/integrations/otel/model/config.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litellm/integrations/otel/model/config.py b/litellm/integrations/otel/model/config.py
index d8439045a12..f0f5befe430 100644
--- a/litellm/integrations/otel/model/config.py
+++ b/litellm/integrations/otel/model/config.py
@@ -263,7 +263,7 @@ class OpenTelemetryV2Config(BaseSettings):
                     endpoint=self.endpoint,
                     headers=self.headers,
                 )
-                if self.model_fields_set & {"exporter", "endpoint", "headers"}
+                if not self.model_fields_set.isdisjoint(("exporter", "endpoint", "headers"))
                 else ExporterSpec()
             ]
         # Ensure ``genai`` is always present and first.