How does Spring Boot 4 handle logging configuration?

# Logging configuration in application.yml:
logging:
  level:
    root: INFO                         # global default level
    com.example.service: DEBUG         # package-specific level
    org.springframework.security: WARN # reduce security noise
    org.hibernate.SQL: DEBUG           # log SQL statements
    org.hibernate.orm.jdbc.bind: TRACE # log SQL parameters
  file:
    name: /var/log/order-service/app.log
  logback:
    rollingpolicy:
      max-file-size: 100MB
      max-history: 30
  pattern:
    console: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"
    file: "%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} [%X{traceId},%X{spanId}] - %msg%n"

// Structured logging (JSON) for production / log aggregation:
logging:
  structured:
    format:
      console: ecs      # Elastic Common Schema
      file: logstash    # Logstash JSON format
# Output: machine-readable JSON logs for ELK stack

// Using SLF4J in application code:
@Service
public class OrderService {
    private static final Logger log = LoggerFactory.getLogger(OrderService.class);
    // Or with Lombok:
    // @Slf4j
    // public class OrderService {

    public Order createOrder(CreateOrderRequest req) {
        log.debug("Creating order for product: {}", req.productId());
        Order order = repo.save(new Order(req));
        log.info("Order created successfully: id={}, product={}", order.id(), order.productId());
        return order;
    }
}

// Change log level at runtime via Actuator:
// POST /actuator/loggers/com.example.service
// Body: {"configuredLevel": "DEBUG"}