[router] fix logger type mismatch (#10774)

Co-authored-by: Simo Lin <linsimo.mark@gmail.com>

sgl-router/py_src/sglang_router/router.py

@@ -53,7 +53,7 @@ class Router:
             Useful when the dp aware scheduling strategy is enabled.
             Default: None
         log_dir: Directory to store log files. If None, logs are only output to console. Default: None
-        log_level: Logging level. Options: 'debug', 'info', 'warning', 'error', 'critical'.
+        log_level: Logging level. Options: 'debug', 'info', 'warn', 'error'.
         service_discovery: Enable Kubernetes service discovery. When enabled, the router will
             automatically discover worker pods based on the selector. Default: False
         selector: Dictionary mapping of label keys to values for Kubernetes pod selection.

sgl-router/py_src/sglang_router/router_args.py

@@ -249,7 +249,7 @@ class RouterArgs:
             f"--{prefix}log-level",
             type=str,
             default="info",
-            choices=["debug", "info", "warning", "error", "critical"],
+            choices=["debug", "info", "warn", "error"],
             help="Set the logging level. If not specified, defaults to INFO.",
         )
         parser.add_argument(