[Misc] Add an env var VLLM_LOGGING_PREFIX, if set, it will be prepend…

… to all logging messages (vllm-project#9590)

Signed-off-by: Sumit Dubey <[email protected]>

vllm/envs.py

@@ -27,6 +27,7 @@
     VLLM_USAGE_SOURCE: str = ""
     VLLM_CONFIGURE_LOGGING: int = 1
     VLLM_LOGGING_LEVEL: str = "INFO"
+    VLLM_LOGGING_PREFIX: str = ""
     VLLM_LOGGING_CONFIG_PATH: Optional[str] = None
     VLLM_TRACE_FUNCTION: int = 0
     VLLM_ATTENTION_BACKEND: Optional[str] = None
@@ -268,6 +269,10 @@ def get_default_config_root():
     "VLLM_LOGGING_LEVEL":
     lambda: os.getenv("VLLM_LOGGING_LEVEL", "INFO"),
 
+    # if set, VLLM_LOGGING_PREFIX will be prepended to all log messages
+    "VLLM_LOGGING_PREFIX":
+    lambda: os.getenv("VLLM_LOGGING_PREFIX", ""),
+
     # Trace function calls
     # If set to 1, vllm will trace function calls
     # Useful for debugging

vllm/logger.py

@@ -15,8 +15,10 @@
 VLLM_CONFIGURE_LOGGING = envs.VLLM_CONFIGURE_LOGGING
 VLLM_LOGGING_CONFIG_PATH = envs.VLLM_LOGGING_CONFIG_PATH
 VLLM_LOGGING_LEVEL = envs.VLLM_LOGGING_LEVEL
+VLLM_LOGGING_PREFIX = envs.VLLM_LOGGING_PREFIX
 
-_FORMAT = "%(levelname)s %(asctime)s %(filename)s:%(lineno)d] %(message)s"
+_FORMAT = (f"{VLLM_LOGGING_PREFIX}%(levelname)s %(asctime)s "
+           "%(filename)s:%(lineno)d] %(message)s")
 _DATE_FORMAT = "%m-%d %H:%M:%S"
 
 DEFAULT_LOGGING_CONFIG = {