Spring Boot Actuator

原文链接

You can choose to manage and monitor your application by using HTTP endpoints or with JMX. Auditing, health, and metrics gathering can also be automatically applied to your application

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

exposing endpoints

management.endpoints.web.exposure.include=*
management.endpoints.web.exposure.exclude=env,beans

注意有JMX和web的两种不同类型

CORS Support

management.endpoints.web.cors.allowed-origins=http://example.com
management.endpoints.web.cors.allowed-methods=GET,POST

实现一些自定义的endpoints

You can also write technology-specific endpoints by using @JmxEndpoint or @WebEndpoint. These endpoints are restricted to their respective technologies. For example, @WebEndpoint is exposed only over HTTP and not over JMX.

You can write technology-specific extensions by using @EndpointWebExtension and @EndpointJmxExtension. These annotations let you provide technology-specific operations to augment an existing endpoint.

To provide custom health information, you can register Spring beans that implement the HealthIndicator interface. You need to provide an implementation of the health() method and return a Health response.

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

@Component
public class MyHealthIndicator implements HealthIndicator {

	@Override
	public Health health() {
		int errorCode = check(); // perform some specific health check
		if (errorCode != 0) {
			return Health.down().withDetail("Error Code", errorCode).build();
		}
		return Health.up().build();
	}

}

引出来一个reactive health indicators部分，如何监控

@Component
public class MyReactiveHealthIndicator implements ReactiveHealthIndicator {

	@Override
	public Mono<Health> health() {
		return doHealthCheck() //perform some specific health check that returns a Mono<Health>
			.onErrorResume(ex -> Mono.just(new Health.Builder().down(ex).build())));
	}

}

类似流式的方式

http的management配置

management.server.port=8081
management.server.address=127.0.0.1

Jmx的配置

spring.jmx.unique-names=true
management.endpoints.jmx.domain=com.example.myapp