Envoy Gateway v1.9.0的可观测性需注意：access log仅证明单跳请求，metrics中的xds_nack_total仅表示Envoy拒绝更新，tracing默认客户端采样率改为0%，需显式设置clientSamplingFraction。控制面与数据面指标分离，不可混用。各信号对应不同排障维度，避免误判。

本文介绍Envoy数据面可观测性，聚焦stats、access log和tracing三种信号。它们都耦合在请求路径上，分别擅长聚合告警、单请求失败分类和跨跳相关。排障时按admin统计树前缀（listener/http/cluster/server）缩小范围，用RESPONSE_FLAGS定位失败原因，tracing需业务传播上下文。强调ACK配置不等于根因已解释，需结合机制篇和排障清单。

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