Actuator & Monitoring

Actuator & Monitoring

Der Actuator liefert produktionsreife Monitoring-Endpoints — Health, Metriken, Info.

Lektion 46: Actuator-Endpoints

# application.yml
management:
  endpoints.web.exposure.include: health,info,metrics,prometheus
  endpoint.health.show-details: always

Lektion 47: Health-Checks

{
  "status": "UP",
  "components": {
    "db": { "status": "UP" },
    "diskSpace": { "status": "UP" },
    "ping": { "status": "UP" }
  }
}

Spring Boot prüft automatisch: DataSource, Kafka, Redis, Disk-Space, PING.

Lektion 48: Metriken

@Service
public class OrderService {
    private final Counter ordersCreated;

    OrderService(MeterRegistry registry) {
        this.ordersCreated = Counter.builder("orders.created")
            .description("Total orders created")
            .register(registry);
    }

    public void createOrder(Order order) {
        ordersCreated.increment();
        // ...
    }
}

Lektion 49: Custom Health Indicators

@Component
public class PaymentHealthIndicator implements HealthIndicator {
    @Override
    public Health health() {
        boolean healthy = checkPaymentGateway();
        return healthy ? Health.up().build()
                       : Health.down().withDetail("gateway", "timeout").build();
    }
}

Lektion 50: Observability in Produktion

• Logs — strukturiert (JSON), mit Trace-IDs
• Metrics — SLI/SLO-Dashboards (Prometheus + Grafana)
• Traces — verteilte Tracing (Micrometer Tracing + Zipkin/OTLP)
• Alerts — Prometheus-Alertmanager für kritische Metriken