[Core] Cleanup startup logging a bit (#10961)

Signed-off-by: Russell Bryant <rbryant@redhat.com>

vllm/engine/arg_utils.py

@@ -433,6 +433,7 @@ class EngineArgs:
                             'capping to sliding window size')
         parser.add_argument('--use-v2-block-manager',
                             action='store_true',
+                            default=True,
                             help='[DEPRECATED] block manager v1 has been '
                             'removed and SelfAttnBlockSpaceManager (i.e. '
                             'block manager v2) is now the default. '

vllm/entrypoints/openai/api_server.py

@@ -175,7 +175,7 @@ async def build_async_engine_client_from_engine_args(
 
         # Select random path for IPC.
         ipc_path = get_open_zmq_ipc_path()
-        logger.info("Multiprocessing frontend to use %s for IPC Path.",
+        logger.debug("Multiprocessing frontend to use %s for IPC Path.",
                      ipc_path)
 
         # Start RPCServer in separate process (holds the LLMEngine).
@@ -249,7 +249,7 @@ def mount_metrics(app: FastAPI):
 
     prometheus_multiproc_dir_path = os.getenv("PROMETHEUS_MULTIPROC_DIR", None)
     if prometheus_multiproc_dir_path is not None:
-        logger.info("vLLM to use %s as PROMETHEUS_MULTIPROC_DIR",
+        logger.debug("vLLM to use %s as PROMETHEUS_MULTIPROC_DIR",
                      prometheus_multiproc_dir_path)
         registry = CollectorRegistry()
         multiprocess.MultiProcessCollector(registry)

vllm/plugins/__init__.py

@@ -57,7 +57,7 @@ def load_general_plugins():
 
     discovered_plugins = entry_points(group='vllm.general_plugins')
     if len(discovered_plugins) == 0:
-        logger.info("No plugins found.")
+        logger.debug("No plugins found.")
         return
     logger.info("Available plugins:")
     for plugin in discovered_plugins: