[router] add --log-level to sgl-router (#6512)

sgl-router/py_src/sglang_router/launch_router.py

@@ -48,8 +48,8 @@ class RouterArgs:
     eviction_interval: int = 60
     max_tree_size: int = 2**24
     max_payload_size: int = 256 * 1024 * 1024  # 256MB default for large batches
-    verbose: bool = False
     log_dir: Optional[str] = None
+    log_level: Optional[str] = None
     # Service discovery configuration
     service_discovery: bool = False
     selector: Dict[str, str] = dataclasses.field(default_factory=dict)
@@ -178,17 +178,19 @@ class RouterArgs:
             default=RouterArgs.max_payload_size,
             help="Maximum payload size in bytes",
         )
-        parser.add_argument(
-            f"--{prefix}verbose",
-            action="store_true",
-            help="Enable verbose logging",
-        )
         parser.add_argument(
             f"--{prefix}log-dir",
             type=str,
             default=None,
             help="Directory to store log files. If not specified, logs are only output to console.",
         )
+        parser.add_argument(
+            f"--{prefix}log-level",
+            type=str,
+            default="info",
+            choices=["debug", "info", "warning", "error", "critical"],
+            help="Set the logging level. If not specified, defaults to INFO.",
+        )
         parser.add_argument(
             f"--{prefix}service-discovery",
             action="store_true",
@@ -275,8 +277,8 @@ class RouterArgs:
             eviction_interval=getattr(args, f"{prefix}eviction_interval"),
             max_tree_size=getattr(args, f"{prefix}max_tree_size"),
             max_payload_size=getattr(args, f"{prefix}max_payload_size"),
-            verbose=getattr(args, f"{prefix}verbose", False),
             log_dir=getattr(args, f"{prefix}log_dir", None),
+            log_level=getattr(args, f"{prefix}log_level", None),
             service_discovery=getattr(args, f"{prefix}service_discovery", False),
             selector=cls._parse_selector(getattr(args, f"{prefix}selector", None)),
             service_discovery_port=getattr(args, f"{prefix}service_discovery_port"),
@@ -404,8 +406,8 @@ def launch_router(args: argparse.Namespace) -> Optional[Router]:
             eviction_interval_secs=router_args.eviction_interval,
             max_tree_size=router_args.max_tree_size,
             max_payload_size=router_args.max_payload_size,
-            verbose=router_args.verbose,
             log_dir=router_args.log_dir,
+            log_level=router_args.log_level,
             service_discovery=router_args.service_discovery,
             selector=router_args.selector,
             service_discovery_port=router_args.service_discovery_port,

sgl-router/py_src/sglang_router/router.py

@@ -31,8 +31,8 @@ class Router:
             routing. Default: 60
         max_payload_size: Maximum payload size in bytes. Default: 256MB
         max_tree_size: Maximum size of the approximation tree for cache-aware routing. Default: 2^24
-        verbose: Enable verbose logging. Default: False
         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'.
         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.
@@ -66,8 +66,8 @@ class Router:
         eviction_interval_secs: int = 60,
         max_tree_size: int = 2**24,
         max_payload_size: int = 256 * 1024 * 1024,  # 256MB
-        verbose: bool = False,
         log_dir: Optional[str] = None,
+        log_level: Optional[str] = None,
         service_discovery: bool = False,
         selector: Dict[str, str] = None,
         service_discovery_port: int = 80,
@@ -100,8 +100,8 @@ class Router:
             eviction_interval_secs=eviction_interval_secs,
             max_tree_size=max_tree_size,
             max_payload_size=max_payload_size,
-            verbose=verbose,
             log_dir=log_dir,
+            log_level=log_level,
             service_discovery=service_discovery,
             selector=selector,
             service_discovery_port=service_discovery_port,