Rework logging (#3358)

Unified all log files into one.

### What problem does this PR solve?

Unified all log files into one.

### Type of change

- [x] Refactoring

rag/settings.py

@@ -14,15 +14,11 @@
 #  limitations under the License.
 #
 import os
-import logging
 from api.utils import get_base_config, decrypt_database_config
 from api.utils.file_utils import get_project_base_directory
-from api.utils.log_utils import LoggerFactory, getLogger
-
 
 # Server
 RAG_CONF_PATH = os.path.join(get_project_base_directory(), "conf")
-SUBPROCESS_STD_LOG_NAME = "std.log"
 
 ES = get_base_config("es", {})
 INFINITY = get_base_config("infinity", {"uri": "infinity:23817"})
@@ -36,29 +32,6 @@ except Exception:
     pass
 DOC_MAXIMUM_SIZE = int(os.environ.get("MAX_CONTENT_LENGTH", 128 * 1024 * 1024))
 
-# Logger
-LoggerFactory.set_directory(
-    os.path.join(
-        get_project_base_directory(),
-        "logs",
-        "rag"))
-# {CRITICAL: 50, FATAL:50, ERROR:40, WARNING:30, WARN:30, INFO:20, DEBUG:10, NOTSET:0}
-LoggerFactory.LEVEL = 30
-
-doc_store_logger = getLogger("doc_store")
-minio_logger = getLogger("minio")
-s3_logger = getLogger("s3")
-azure_logger = getLogger("azure")
-cron_logger = getLogger("cron_logger")
-chunk_logger = getLogger("chunk_logger")
-database_logger = getLogger("database")
-
-formatter = logging.Formatter("%(asctime)-15s %(levelname)-8s (%(process)d) %(message)s")
-for logger in [doc_store_logger, minio_logger, s3_logger, azure_logger, cron_logger, chunk_logger, database_logger]:
-    logger.setLevel(logging.INFO)
-    for handler in logger.handlers:
-        handler.setFormatter(fmt=formatter)
-
 SVR_QUEUE_NAME = "rag_flow_svr_queue"
 SVR_QUEUE_RETENTION = 60*60
 SVR_QUEUE_MAX_LEN = 1024