fix(health): return structured response from webhook health check branch

The service == "webhook" branch of health_services_endpoint() called
proxy_logging_obj.budget_alerts() but had no return statement, so
execution fell through to the end of the function and implicitly
returned None. FastAPI serialized this as JSON `null` with HTTP 200,
unlike every other service branch which returns a structured
{"status": ..., "message": ...} dict.

Add the missing return so the webhook branch matches the response
shape used by the other branches, plus a regression test that mocks
budget_alerts and asserts both the call and the structured response.

litellm/proxy/health_endpoints/_health_endpoints.py

@@ -332,6 +332,7 @@ async def health_services_endpoint(
                 type="user_budget",
                 user_info=user_info,
             )
+            return {"status": "success", "message": "Mock webhook alert sent"}
         elif service == "sqs":
             from litellm.integrations.sqs import SQSLogger
 

tests/test_litellm/proxy/health_endpoints/test_health_endpoints.py

@@ -265,6 +265,36 @@ async def test_health_services_endpoint_sqs(status, error_message):
         mock_instance.async_health_check.assert_awaited_once()
 
 
+@pytest.mark.asyncio
+async def test_health_services_endpoint_webhook_returns_structured_response():
+    """
+    Regression test: the /health/services webhook branch called
+    proxy_logging_obj.budget_alerts() but had no return statement, so
+    execution fell through to the end of the function and returned None
+    (serialized as JSON null with HTTP 200) instead of a structured
+    {"status": ..., "message": ...} dict like every other service branch.
+    """
+    user_api_key_dict = UserAPIKeyAuth(
+        token="test-token",
+        user_id="test-user",
+        key_alias="test-key-alias",
+        team_id="test-team",
+    )
+    mock_budget_alerts = AsyncMock()
+
+    with patch(
+        "litellm.proxy.proxy_server.proxy_logging_obj.budget_alerts",
+        mock_budget_alerts,
+    ):
+        result = await health_services_endpoint(
+            user_api_key_dict=user_api_key_dict,
+            service="webhook",
+        )
+
+    mock_budget_alerts.assert_awaited_once()
+    assert result == {"status": "success", "message": "Mock webhook alert sent"}
+
+
 @pytest.mark.asyncio
 async def test_health_license_endpoint_with_active_license():
     license_data = {