feat(monitoring): 接入 Loki + Promtail 日志采集，Grafana 可直接搜索容器日志

loki-config.yml

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+# Author: fruit.com.cn
+# Loki 单机配置：文件系统存储，7 天保留，供 Grafana 查询容器日志。
+auth_enabled: false
+
+server:
+  http_listen_port: 3100
+  grpc_listen_port: 9096
+
+common:
+  instance_addr: 127.0.0.1
+  path_prefix: /loki
+  storage:
+    filesystem:
+      chunks_directory: /loki/chunks
+      rules_directory: /loki/rules
+  replication_factor: 1
+  ring:
+    kvstore:
+      store: inmemory
+
+query_range:
+  results_cache:
+    cache:
+      embedded_cache:
+        enabled: true
+        max_size_mb: 100
+
+schema_config:
+  configs:
+    - from: 2024-01-01
+      store: tsdb
+      object_store: filesystem
+      schema: v13
+      index:
+        prefix: index_
+        period: 24h
+
+# 7 天保留，避免磁盘无限增长
+limits_config:
+  retention_period: 168h
+  max_query_series: 1000
+  # 允许采集历史日志（容器启动时的旧日志也能入库），靠 retention_period 控制总量
+  reject_old_samples: false
+  ingestion_rate_mb: 20
+  ingestion_burst_size_mb: 40
+  per_stream_rate_limit: 10MB
+  per_stream_rate_limit_burst: 40MB
+
+compactor:
+  working_directory: /loki/compactor
+  compaction_interval: 10m
+  retention_enabled: true
+  retention_delete_delay: 2h
+  retention_delete_worker_count: 150
+  delete_request_store: filesystem