fix(proxy): publish router_settings changes so peer pods apply them on resync

add_deployment already reapplies DB router settings through _update_llm_router,
so gating router_settings out of the pub/sub publish set left the push path
covering less than the resync actually applies

litellm/proxy/common_utils/config_sync_pubsub.py

@@ -60,6 +60,7 @@ _CONFIG_SYNCED_TABLE_NAMES: frozenset[str] = frozenset(
 _RESYNC_APPLIED_CONFIG_PARAM_NAMES: frozenset[str] = frozenset(
     {
         "general_settings",
+        "router_settings",
         "litellm_settings",
         "model_cost_map_reload_config",
         "anthropic_beta_headers_reload_config",

tests/test_litellm/proxy/common_utils/test_config_sync_pubsub.py

@@ -56,10 +56,11 @@ _EXPECTED_RESYNC_APPLIED_CONFIG_PARAM_NAMES = frozenset(
         "general_settings",
         "litellm_settings",
         "model_cost_map_reload_config",
+        "router_settings",
     }
 )
 
-_STARTUP_ONLY_CONFIG_PARAM_NAMES = ("environment_variables", "router_settings")
+_STARTUP_ONLY_CONFIG_PARAM_NAMES = ("environment_variables",)
 
 
 class _RecordingRedisClient(Redis):
@@ -716,13 +717,14 @@ async def _publish_calls_for_invalidated_param(param_name: str) -> List[Tuple[st
     return client.published
 
 
-async def test_invalidate_config_param_publishes_params_a_resync_applies() -> None:
-    published = await _publish_calls_for_invalidated_param("general_settings")
+@pytest.mark.parametrize("param_name", sorted(_EXPECTED_RESYNC_APPLIED_CONFIG_PARAM_NAMES))
+async def test_invalidate_config_param_publishes_params_a_resync_applies(param_name: str) -> None:
+    published = await _publish_calls_for_invalidated_param(param_name)
 
     assert len(published) == 1
     channel, message = published[0]
     assert channel == CONFIG_SYNC_CHANNEL
-    assert json.loads(message) == {"object_type": "general_settings"}
+    assert json.loads(message) == {"object_type": param_name}
 
 
 @pytest.mark.parametrize("param_name", _STARTUP_ONLY_CONFIG_PARAM_NAMES)

tests/test_litellm/proxy/proxy_server/test_proxy_config.py

@@ -2058,6 +2058,42 @@ async def test_ProxyConfig__add_router_settings_from_db_config_none_router_noop(
         await pc._add_router_settings_from_db_config()  # type: ignore[call-arg]
 
 
+# ---------------------------------------------------------------------------
+# ProxyConfig.add_deployment
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_ProxyConfig_add_deployment_applies_db_router_settings(monkeypatch):
+    from litellm.proxy import proxy_server
+
+    pc = ProxyConfig()
+    fake_router = MagicMock()
+    fake_router.get_model_list = MagicMock(return_value=[])
+    fake_prisma = MagicMock()
+    fake_prisma.db.litellm_config.find_first = AsyncMock(
+        return_value=SimpleNamespace(param_value={"routing_strategy": "latency-based-routing"})
+    )
+
+    async def fake_get_config(*args, **kwargs):
+        return {}
+
+    monkeypatch.setattr(pc, "get_config", fake_get_config)
+    monkeypatch.setattr(pc, "_get_models_from_db", AsyncMock(return_value=[]))
+    monkeypatch.setattr(pc, "_init_non_llm_objects_in_db", AsyncMock())
+    monkeypatch.setattr(proxy_server, "prefetch_config_params", AsyncMock())
+    monkeypatch.setattr(proxy_server, "get_config_param", AsyncMock(return_value=None))
+    monkeypatch.setattr(proxy_server, "llm_router", fake_router)
+    monkeypatch.setattr(proxy_server, "master_key", "sk-master")
+    monkeypatch.setattr(proxy_server, "prisma_client", fake_prisma)
+    monkeypatch.setattr(proxy_server, "general_settings", {})
+    monkeypatch.setattr(proxy_server, "proxy_config", pc)
+
+    await pc.add_deployment(prisma_client=fake_prisma, proxy_logging_obj=MagicMock())
+
+    fake_router.update_settings.assert_called_once_with(routing_strategy="latency-based-routing")
+
+
 # ---------------------------------------------------------------------------
 # ProxyConfig._add_general_settings_from_db_config
 # ---------------------------------------------------------------------------