Spring Cloud Test 2

    Question 1: SERVICE DISCOVERY - Default Port for Eureka Server

    By default, on which port does a Eureka Server run?

    Question 2: API GATEWAY - Predicates in Routing

    What do Predicates in Spring Cloud Gateway define?

    Question 3: CENTRALIZED CONFIG - Config Client Setup

    Which file is typically used by a Config Client to connect to the Config Server?

    Question 4: CIRCUIT BREAKEER - Code Snippet (Config in application.yml)

    What does the following config do?

    resilience4j.circuitbreaker:
  instances:
    orderService:
      failureRateThreshold: 50
      waitDurationInOpenState: 10s

    Question 5: DISTRIBUTED TRACING - Micrometer Metrics Purpose

    What is Micrometer used for in Spring Boot?

    Question 6: SERVICE DISCOVERY - application.properties (Eureka Client)

    What does this configuration achieve?

    spring.application.name=order-service
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

    Question 7: API GATEWAY - Code Snippet (Header Predicate)

    What does this config enforce?

    spring:
  cloud:
    gateway:
      routes:
        - id: auth_route
          uri: http://localhost:8082
          predicates:
            - Header=X-Auth-Token, .+

    Question 8: CENTRALIZED CONFIG - Code Snippet (Client bootstrap.yml)

    What does this configuration do?

    spring:
  cloud:
    config:
      uri: http://localhost:8888
  application:
    name: order-service

    Question 9: RESILIENCE - Retry Mechanism

    In Resilience4j, what does the `@Retry` annotation do?

    Question 10: 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 11: SERVICE DISCOVERY - @LoadBalanced in RestTemplate

    What does the @LoadBalanced annotation do for a RestTemplate bean in a Eureka-enabled Spring Boot app?

    Question 12: API GATEWAY - Filters

    What is the purpose of filters in Spring Cloud Gateway?

    Question 13: CENTRALIZED CONFIG - Profiles & Labels

    If a service named order-service runs with profile dev, which file will Config Server serve?

    Question 14: CIRCUIT BREAKEER - Code Snippet (Retry Example)

    What is the effect of this snippet?

    @Retry(name = "paymentRetry", fallbackMethod = "paymentFallback")
public String processPayment() {
    return paymentClient.pay();
}

    Question 15: DISTRIBUTED TRACING - Auto-Instrumentation

    How does Spring Cloud Sleuth instrument HTTP requests automatically?

    Question 16: SERVICE DISCOVERY - Code Snippet (Inter-Service Call)

    What does the following code achieve?

    @Autowired
private RestTemplate restTemplate;

public String callPayment() {
    return restTemplate.getForObject("http://payment-service/pay", String.class);
}

    Question 17: API GATEWAY - Code Snippet (Add Request Header Filter)

    What does this filter configuration do?

    spring:
  cloud:
    gateway:
      routes:
        - id: log_route
          uri: http://localhost:8083
          predicates:
            - Path=/logs/**
          filters:
            - AddRequestHeader=X-App-Name, GatewayService

    Question 18: CENTRALIZED CONFIG - Refreshing Config at Runtime

    How do you make a Spring Boot bean refreshable when config values change in Config Server?

    Question 19: RESILIENCE - Bulkhead Pattern

    What does the Bulkhead feature in Resilience4j achieve?

    Question 20: DISTRIBUTED TRACING - Code Snippet (Micrometer Counter)

    What does this snippet achieve?

    @Autowired
MeterRegistry registry;

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