[Config] Retire get_global_server_args, and clear the deprecated flags that have a replacement (#38375)

test/registered/unit/test_runtime_context.py

@@ -11,6 +11,7 @@ import pathlib as _pathlib
 import shutil
 import tempfile
 import unittest
+import warnings
 from unittest.mock import patch
 
 import sglang as _sglang
@@ -246,10 +247,33 @@ class TestServerArgsOwnership(_IsolatedServerArgs):
         # Identity, not equality: the slot holds the very object published.
         sentinel = ServerArgs(model_path="dummy")
         server_args_module.set_global_server_args_for_scheduler(sentinel)
-        self.assertIs(server_args_module.get_global_server_args(), sentinel)
         self.assertIs(get_server_args(), sentinel)
         self.assertIs(get_context().server_args, sentinel)
 
+    def test_the_retired_accessor_raises_and_names_the_replacement(self):
+        """`get_global_server_args` is retired: it answered with the record,
+        so a caller reading a field resolution had decided got a stale value
+        and no error at all.
+
+        `RuntimeError` unconditionally, not a warning first: a
+        `DeprecationWarning` is filtered by default outside `__main__`, so no
+        production caller would have seen it, and under
+        `-W error::DeprecationWarning` it would have changed the exception a
+        caller catches. The message has to name where to read instead, since
+        the answer differs by what the caller wanted.
+        """
+        with self.assertRaises(RuntimeError) as cm:
+            server_args_module.get_global_server_args()
+        message = str(cm.exception)
+        self.assertIn("runtime_context", message)
+        self.assertIn("get_server_args()", message)
+
+        # And the type does not change when warnings are errors.
+        with warnings.catch_warnings():
+            warnings.simplefilter("error")
+            with self.assertRaises(RuntimeError):
+                server_args_module.get_global_server_args()
+
     def test_tokenizer_alias_is_distinct_role_shim(self):
         # Deliberately NOT an alias: the two legacy setters publish with
         # different process roles (scheduler vs tokenizer).
@@ -260,10 +284,9 @@ class TestServerArgsOwnership(_IsolatedServerArgs):
 
     def test_pre_publish_error_verbatim(self):
         reset_context()
-        for accessor in (get_server_args, server_args_module.get_global_server_args):
-            with self.assertRaises(ValueError) as cm:
-                accessor()
-            self.assertEqual(str(cm.exception), "Global server args is not set yet!")
+        with self.assertRaises(ValueError) as cm:
+            get_server_args()
+        self.assertEqual(str(cm.exception), "Global server args is not set yet!")
 
     def test_republish_overwrite_allowed(self):
         first = ServerArgs(model_path="dummy")