feat(syslog): 增加 WAL 与分 IP 接入诊断

- 每分钟保存 WAL 全局状态和分 IP 接收统计，历史保留 7 天
- 记录接收、WAL 落盘、Kafka ACK、过滤、背压及丢弃数量
- 增加 wal_max_pending_bytes 和 wal_admission_unavailable 指标
- 增加 TCP pending 当前值及进程内峰值统计
- 网络异常后同一 IP 恢复接收时打印恢复日志
- 提供当前状态及按日期查询诊断历史的接口
- 连接关闭时清理 TCP pending 计数并停止无效重试
- 增加相关单元测试和现场排查文档

haobang-security-dm/syslog-serve/src/main/java/com/netty/SyslogUdpChannelInitializer.java

@@ -1,6 +1,7 @@
 package com.netty;
 
 import com.haobang.dispatch.DeviceContextResolver;
+import com.haobang.diagnostics.SyslogIpMetricsRegistry;
 import com.haobang.wal.SyslogWalService;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelPipeline;
@@ -17,13 +18,16 @@ public class SyslogUdpChannelInitializer extends ChannelInitializer<DatagramChan
     private final SyslogWalService walService;
     private final DeviceContextResolver deviceResolver;
     private final boolean dropInvalidBeforeWal;
+    private final SyslogIpMetricsRegistry ipMetrics;
 
     SyslogUdpChannelInitializer(Charset syslogCharset, SyslogWalService walService,
-                                DeviceContextResolver deviceResolver, boolean dropInvalidBeforeWal) {
+                                DeviceContextResolver deviceResolver, boolean dropInvalidBeforeWal,
+                                SyslogIpMetricsRegistry ipMetrics) {
         this.syslogCharset = java.util.Objects.requireNonNull(syslogCharset, "syslogCharset");
         this.walService = java.util.Objects.requireNonNull(walService, "walService");
         this.deviceResolver = java.util.Objects.requireNonNull(deviceResolver, "deviceResolver");
         this.dropInvalidBeforeWal = dropInvalidBeforeWal;
+        this.ipMetrics = java.util.Objects.requireNonNull(ipMetrics, "ipMetrics");
     }
 
     @Override
@@ -36,6 +40,6 @@ public class SyslogUdpChannelInitializer extends ChannelInitializer<DatagramChan
 
         // 添加业务处理器
         pipeline.addLast("handler", new SyslogMessageHandler(
-                syslogCharset, walService, deviceResolver, dropInvalidBeforeWal));
+                syslogCharset, walService, deviceResolver, dropInvalidBeforeWal, ipMetrics));
     }
 }