[chore] add logger

Author: liyonghua0910

fastdeploy/metrics/interface.py

@@ -1,5 +1,5 @@
 """
-# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
+# Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

fastdeploy/metrics/metrics.py

@@ -40,6 +40,7 @@
 )
 from fastdeploy.metrics.stats import ZMQMetricsStats
 from fastdeploy.spec_decode import SpecMethod
+from fastdeploy.utils import logger
 
 
 class SimpleCollector(Collector):
@@ -687,6 +688,8 @@ def __init__(self):
         except (json.JSONDecodeError, TypeError):
             self._default_labelvalues = {}
         self._enable_labels = isinstance(self._default_labelvalues, dict) and len(self._default_labelvalues) > 0
+        if self._enable_labels:
+            logger.info(f"Metric labels are enabled with default values: {self._default_labelvalues}")
 
         # 在模块加载，指标注册先设置Prometheus环境变量
         setup_multiprocess_prometheus()