Spring Boot 4 Microservices & REST APIs · 课时

Micrometer Tracing

使用追踪 ID 和跨度 ID 为服务添加监测

Micrometer Tracing 是 CoddyKit 上的免费 Spring Boot 4 Microservices & REST APIs 课时。这是第 2 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Spring Boot 4 Microservices & REST APIs 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Spring Boot 4 Microservices & REST APIs 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Micrometer Tracing overview

Micrometer Tracing is a vendor-neutral tracing facade. You code against its API, and a bridge (Brave or OpenTelemetry) does the real work and propagation.

Adding the dependencies

Add Micrometer Tracing plus a bridge. The Brave bridge is a common choice.

<dependency>
  <groupId>io.micrometer</groupId>
  <artifactId>micrometer-tracing-bridge-brave</artifactId>
</dependency>

Auto-configuration kicks in

With the bridge on the classpath, Spring Boot auto-configures a Tracer and instruments incoming requests and outbound HTTP clients. Many spans appear with zero code.

The Tracer bean

The Tracer is the entry point for working with spans manually. It is auto-configured and injectable.

@Service
public class OrderService {
    private final Tracer tracer;
    public OrderService(Tracer tracer) { this.tracer = tracer; }
}

Creating a custom span

Wrap a meaningful unit of work in its own span to time it and see it in the trace.

Span span = tracer.nextSpan().name("calculate-price");
try (Tracer.SpanInScope ws = tracer.withSpan(span.start())) {
    calculatePrice();
} finally {
    span.end();
}

@NewSpan and @SpanTag

For convenience, annotate a method with @NewSpan to wrap it in a span automatically, and tag arguments with @SpanTag.

@NewSpan("load-customer")
public Customer load(@SpanTag("customerId") Long id) {
    return repo.findById(id);
}

Adding tags and events

Enrich spans with tags (key/value metadata) and events (timestamped notes) to make traces more diagnostic.

span.tag("user.id", userId);
span.event("cache-miss");

Reading the current trace IDs

You can read the active trace and span IDs - useful for returning a trace id to clients or correlating.

Span current = tracer.currentSpan();
if (current != null) {
    String traceId = current.context().traceId();
    String spanId = current.context().spanId();
}

Brave vs OpenTelemetry bridge

Two bridges exist: Brave (Zipkin-native) and OpenTelemetry (OTel ecosystem). Pick one - they should not be on the classpath together.

Propagation format

The bridge controls how context is propagated. You can choose formats like W3C (traceparent) or B3, which matters when integrating with other systems.

management:
  tracing:
    propagation:
      type: w3c

Baggage

Baggage is extra key/value data propagated alongside the trace context across services - e.g. a tenant id - so every downstream span and log can access it.

Quick Check

Check your Micrometer Tracing knowledge.

Recap

You used Micrometer Tracing:

It is a facade; a Brave or OTel bridge does the real work
Inject the Tracer to create custom spans, or use @NewSpan
Add tags/events; read traceId/spanId
Baggage propagates extra context

常见问题解答

「Micrometer Tracing」课时是免费的吗？

是的 — 「Micrometer Tracing」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Spring Boot 4 Microservices & REST APIs 课程的其余内容，请升级到 CoddyKit PRO。 Spring Boot 4 Microservices & REST APIs 课程共包含 4 节课。

「Micrometer Tracing」这节课中我会学到什么？

使用追踪 ID 和跨度 ID 为服务添加监测你通过在浏览器中直接运行的动手代码来练习 Spring Boot 4 Microservices & REST APIs，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Spring Boot 4 Microservices & REST APIs 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Spring Boot 4 Microservices & REST APIs 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 2 节课，共 4 节。

「Micrometer Tracing」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Spring Boot 4 Microservices & REST APIs 课中编写并运行代码吗？

能。每节 Spring Boot 4 Microservices & REST APIs 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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