Distributed Tracing & Observability With Zipkin and Micrometer Mock Test

Question 1: DISTRIBUTED TRACING - Purpose of Distributed Tracing

What is the primary purpose of distributed tracing in microservices?

Question 2: DISTRIBUTED TRACING - Spring Cloud Sleuth Role

What does Spring Cloud Sleuth do in a Spring Boot microservice?

Question 3: DISTRIBUTED TRACING - Code Snippet (Enable Sleuth and Zipkin)

What is achieved by this configuration in application.yml?

spring:
  zipkin:
    base-url: http://localhost:9411
    enabled: true
  sleuth:
    sampler:
      probability: 1.0

Question 4: DISTRIBUTED TRACING - Span vs Trace

Which statement is correct?

Question 5: DISTRIBUTED TRACING - Micrometer Metrics Purpose

What is Micrometer used for in Spring Boot?

Question 6: DISTRIBUTED TRACING - Code Snippet (Custom Span)

What does this snippet do?

@Autowired
Tracer tracer;

public void processPayment() {
    Span newSpan = tracer.nextSpan().name("payment-span");
    try (Tracer.SpanInScope ws = tracer.withSpan(newSpan.start())) {
        // business logic here
    } finally {
        newSpan.end();
    }
}

Question 7: DISTRIBUTED TRACING - Auto-Instrumentation

How does Spring Cloud Sleuth instrument HTTP requests automatically?

Question 8: DISTRIBUTED TRACING - Code Snippet (Micrometer Counter)

What does this snippet achieve?

@Autowired
MeterRegistry registry;

public void incrementOrders() {
    registry.counter("orders.processed").increment();
}

Question 9: DISTRIBUTED TRACING - Sampling Probability

In Sleuth, what does setting spring.sleuth.sampler.probability=0.5 do?

Question 10: DISTRIBUTED TRACING - Visualizing Traces

Which tool is commonly used to visualize traces collected from Sleuth?