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Monitoramento com Spring Boot Actuator

Utilize os endpoints do Spring Boot Actuator para monitorar, gerenciar e inspecionar sua aplicação em produção.

Monitoramento com Spring Boot Actuator é uma aula grátis de Spring Boot 4 Complete Guide no CoddyKit. Esta é a aula 2 de 4. Você pode ler a aula completa abaixo gratuitamente — depois pratica ao vivo no navegador com um editor de código integrado e um tutor de IA 24/7. Faz parte do caminho de aprendizado de Spring Boot 4 Complete Guide, e seu progresso é sincronizado entre a web e o app CoddyKit. O curso de Spring Boot 4 Complete Guide inclui 4 aulas no total.

Partes desta aula ainda não foram traduzidas e aparecem em inglês.

Meet Spring Boot Actuator

Spring Boot Actuator is a powerful tool that helps you monitor and manage your application when it's running in production. Think of it as your app's built-in dashboard!

It provides production-ready features without requiring you to write much code.

  • Monitoring: Check health, metrics, and environment details.
  • Management: Log levels, shutdown, refresh context.
  • Insight: Understand your app's internal workings.

Include Actuator in Your Project

To use Actuator, you just need to add its starter dependency to your project. This brings in all the necessary libraries.

For Maven, add this to your pom.xml:

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

Discover Actuator's Endpoints

Once Actuator is added, your application automatically exposes several "endpoints". These are HTTP URLs that provide specific information about your running app.

Some default endpoints include:

  • /actuator/health: Shows application health status.
  • /actuator/info: Displays general application information.
  • /actuator/metrics: Provides detailed metrics (CPU, memory, etc.).

By default, only /health and /info are exposed via web.

Run & Access Actuator

Let's create a simple Spring Boot app with Actuator. After running it, you can access the default endpoints in your browser or with a tool like curl.

Try running this and then navigate to http://localhost:8080/actuator/health.

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ActuatorDemoApplication {
  public static void main(String[] args) {
    SpringApplication.run(ActuatorDemoApplication.class, args);
  }
}

Deep Dive: The /health Endpoint

The /actuator/health endpoint is crucial for understanding your application's operational status. It aggregates information from various "health indicators".

  • DiskSpace: Checks available disk space.
  • DataSource: Verifies database connectivity (if configured).
  • Liveness/Readiness: For Kubernetes deployments (newer versions).

It typically returns {"status": "UP"} if everything is fine, or details if something is down.

Custom Info with /info

The /actuator/info endpoint provides general information about your application. By default, it's empty, but you can easily populate it with useful details.

Add custom properties to your application.properties or application.yml:

info.app.name=MyActuatorApp
info.app.version=1.0.0
info.app.description=A demo for CoddyKit

Configure & Expose More Endpoints

By default, only /health and /info are exposed over the web. You can expose more endpoints like /beans (list all Spring beans) or /env (environment properties).

To expose all endpoints, add this to application.properties:

management.endpoints.web.exposure.include=*

Monitor Performance with /metrics

The /actuator/metrics endpoint is invaluable for performance monitoring. It exposes various metrics about your application, JVM, and system.

Examples of metrics:

  • jvm.memory.used: Current JVM memory usage.
  • system.cpu.usage: System CPU load.
  • http.server.requests: Details about incoming HTTP requests.

You can query specific metrics like /actuator/metrics/jvm.memory.used for detailed data.

Build Your Own Health Checks

You can create custom health indicators to check the status of specific parts of your application, like an external service dependency or a custom cache.

Implement the HealthIndicator interface:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Component;

@SpringBootApplication
public class CustomHealthApp {
    public static void main(String[] args) {
        SpringApplication.run(CustomHealthApp.class, args);
    }
}

@Component
class MyCustomHealthIndicator implements HealthIndicator {

    @Override
    public Health health() {
        // Simulate checking an external service
        boolean serviceIsUp = Math.random() > 0.5; // Randomly up or down
        if (serviceIsUp) {
            return Health.up().withDetail("myServiceStatus", "OK").build();
        } else {
            return Health.down().withDetail("myServiceStatus", "Failed").build();
        }
    }
}

Quick Check: Actuator Endpoints

Which of the following Actuator endpoints are exposed by default over the web in a basic Spring Boot application with the Actuator dependency?

Actuator: Your App's Best Friend

Congratulations! You've learned how Spring Boot Actuator transforms your application into a production-ready, observable service.

  • It provides crucial insights into your app's health and performance.
  • You can easily add it with a single dependency.
  • Default endpoints like /health and /info are automatically available.
  • You can expose more endpoints and even create custom health checks.

Actuator is a must-have for any serious Spring Boot application!

Perguntas Frequentes

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Utilize os endpoints do Spring Boot Actuator para monitorar, gerenciar e inspecionar sua aplicação em produção. Você pratica Spring Boot 4 Complete Guide com código prático que executa diretamente no navegador, e um tutor de IA 24/7 responde suas dúvidas enquanto trabalha na aula.

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Nenhuma experiência prévia é necessária. Spring Boot 4 Complete Guide no CoddyKit é estruturado para alunos iniciantes até avançados, então você pode começar aqui ou desde o início e aprender no seu ritmo. Esta é a aula 2 de 4.

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A maioria das aulas CoddyKit leva cerca de 5–10 minutos. Cada uma é compacta e interativa, então você faz progresso constante e retoma exatamente de onde parou entre web e app.

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Sim. Cada aula de Spring Boot 4 Complete Guide inclui um editor de código integrado, então você escreve e executa código real direto no navegador e recebe feedback de IA instantaneamente — nenhuma configuração local necessária.

Todas as aulas deste curso

  1. Conteinerização de Aplicações Spring Boot
  2. Monitoramento com Spring Boot Actuator
  3. Estratégias de Implantação na Nuvem
  4. Criando pipelines de CI/CD para Spring Boot
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