diff --git a/README.md b/README.md
index 8b9ffee5..22077cab 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@
 | MQTT 客户端 | Eclipse Paho 1.2.5 |
 | 会话索引 | Redis |
 | 熔断/限流 | Resilience4j 2 |
-| 可观测 | Micrometer + Prometheus + OpenTelemetry |
+| 可观测 | Micrometer + Prometheus |
 | 冷存 | S3 / OSS / 本地 |
 | 构建 | Maven + Spotless + ArchUnit |
 
@@ -38,7 +38,7 @@ lingniu-vehicle-ingest/
 │   │   ├── ingest-core/             Pipeline / Dispatcher / Disruptor / Session 桥
 │   │   ├── session-core/            设备会话 + 鉴权 + Token + Redis SessionStore
 │   │   ├── vehicle-identity/        跨协议车辆身份解析 + MySQL 外部标识绑定
-│   │   └── observability/           metrics / tracing / health
+│   │   └── observability/           metrics / health
 │   ├── protocols/
 │   │   ├── protocol-gb32960/        GB/T 32960
 │   │   ├── protocol-jt808/          JT/T 808（统一身份映射 + 事件 metadata 内部 VIN + 注册/鉴权/心跳/注销/位置/批量位置/参数/属性/媒体/透传/未知上行和坏帧兜底/断链清理会话/下行分包）
diff --git a/docs/module-data-flow.html b/docs/module-data-flow.html
index 5345d098..89d7ba19 100644
--- a/docs/module-data-flow.html
+++ b/docs/module-data-flow.html
@@ -309,7 +309,7 @@ flowchart TB
     codec["ingest-codec-common<br/>BCD / CRC / BCC / bit 工具"]
     session["session-core<br/>设备会话、命令分发接口、会话存储"]
     identity["vehicle-identity<br/>跨协议身份解析、MySQL 绑定表"]
-    obs["observability<br/>metrics / tracing / health"]
+    obs["observability<br/>metrics / health"]
     api["ingest-api<br/>ProtocolId / RawFrame / VehicleEvent / 注解 SPI"]
     registry["HandlerRegistry<br/>按协议、命令、infoType 路由"]
     dispatcher["Dispatcher<br/>RawFrame 到 Handler 到 EventBus"]
@@ -535,7 +535,7 @@ flowchart LR
       </tr>
       <tr>
         <td>modules/core/observability</td>
-        <td>监控、指标、追踪、健康检查等横切能力。</td>
+        <td>监控、指标、健康检查等横切能力。</td>
         <td>核心管线和 Sink 运行状态。</td>
         <td>Micrometer 指标、健康信息。</td>
         <td><span class="tag green">可用性</span><span class="tag">延迟监控</span></td>
diff --git a/modules/apps/vehicle-history-app/src/test/java/com/lingniu/ingest/historyapp/MavenModuleProfileTest.java b/modules/apps/vehicle-history-app/src/test/java/com/lingniu/ingest/historyapp/MavenModuleProfileTest.java
index 7f5a7827..1c6b75b0 100644
--- a/modules/apps/vehicle-history-app/src/test/java/com/lingniu/ingest/historyapp/MavenModuleProfileTest.java
+++ b/modules/apps/vehicle-history-app/src/test/java/com/lingniu/ingest/historyapp/MavenModuleProfileTest.java
@@ -267,6 +267,10 @@ class MavenModuleProfileTest {
     void observabilityBuildSurfaceUsesMicrometerWithoutUnusedOpenTelemetryBom() throws Exception {
         Document pom = rootPom();
         Document observabilityPom = modulePom("modules/core/observability/pom.xml");
+        String readme = Files.readString(repositoryRoot().resolve("README.md"));
+        String moduleDataFlow = Files.readString(repositoryRoot().resolve("docs/module-data-flow.html"));
+        String traceSpan = Files.readString(repositoryRoot()
+                .resolve("modules/core/ingest-api/src/main/java/com/lingniu/ingest/api/annotation/TraceSpan.java"));
 
         assertThat(hasProjectProperty(pom, "micrometer.version"))
                 .isTrue();
@@ -281,6 +285,15 @@ class MavenModuleProfileTest {
                 .isFalse();
         assertThat(productionJavaContains("io.opentelemetry"))
                 .isFalse();
+        assertThat(readme)
+                .contains("| 可观测 | Micrometer + Prometheus |")
+                .doesNotContain("OpenTelemetry");
+        assertThat(moduleDataFlow)
+                .contains("observability<br/>metrics / health")
+                .doesNotContain("observability<br/>metrics / tracing / health");
+        assertThat(traceSpan)
+                .doesNotContain("OpenTelemetry")
+                .doesNotContain("span");
     }
 
     @Test
diff --git a/modules/core/ingest-api/src/main/java/com/lingniu/ingest/api/annotation/TraceSpan.java b/modules/core/ingest-api/src/main/java/com/lingniu/ingest/api/annotation/TraceSpan.java
index daf225c0..1dbbb521 100644
--- a/modules/core/ingest-api/src/main/java/com/lingniu/ingest/api/annotation/TraceSpan.java
+++ b/modules/core/ingest-api/src/main/java/com/lingniu/ingest/api/annotation/TraceSpan.java
@@ -6,7 +6,7 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 /**
- * 为 Handler 方法开启 OpenTelemetry span。
+ * 为 Handler 方法标记轻量 traceId 诊断名称。
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.METHOD)