);

• “我看不到任何监控信息” 原因这方面。默认仅暴露 health。别忘了在 application.yml 中显式开启需要的 metricsinfo 等。

• “Promeus 拉取失败” 再看原因，未添加 micrometer-registry-promeus 或未将 /actuator/promeus 加入到 exposure.include。

• “自定义 HealthIndicator 显示为 DOWN” 说到原因，自定义状态如 DEGRADED 默认被映射为 DOWN。要手动调整 management.health.status.order 配置。

五、自定义 HealthIndicator

基本实现

private final RestTemplate restTemplate;@Value
private String healthEndpoint;@Override
public Health health {
try {
long startTime = System.currentTimeMillis;ResponseEntity response = restTemplate.getForEntity;long responseTime = System.currentTimeMillis - startTime;if .is2xxSuccessful) {
return Health.up
.withDetail
.withDetail
.build;}
return Health.down
.withDetail.value)
.build;} catch {
return Health.down.build;}
}

自定义健康状态

@Override
public Health health {
int errorCode = checkService;// 模拟业务判断
if { // 正常
return Health.up.build;}
// 自定义状态码
return Health.status
.withDetail
.withDetail
.build;老实说，}

六、自定义端点 @Endpoint

端点注解程序

完整自定义端点示例

java @Component @Endpoint public class FeaturesEndpoint {

private final Map features = new ConcurrentHashMap<>;public FeaturesEndpoint {
features.put);features.put);}
@ReadOperation
public Map features { return features;老实说，}
@ReadOperation

public Feature feature {return features.get;}

@WriteOperation public Feature updateFeature(@Selector String name,@Selector boolean enabled){ Feature f=features.get;if{ f.setEnabled;} return f，}

@DeleteOperation public void deleteFeature{features.remove;}

/* 内部 POJO / static class Feature{ private String name;private boolean enabled;/ getters/setters omitted for brevity */ } }

yaml management: endpoints: 从web来看，exposure: include: health,info,features # 必须显式包含你自建的 endpoint id

说到访问方式。

bash curl http://localhost:/actuator/features # 列出全部功能开关 curl http://localhost:/actuator/features/darkMode # 单个功能详情 curl -X POST http://localhost:/actuator/features/darkMode -d '{"enabled":false}' # 开关更新 curl -X DELETE http://localhost:/actuator/features/娱乐aFeatures # 删除功能记录

自动注册原理概览

mermaid flowchart LR A --> B B --> C C --> D D --> E E --> F F --> G

七、Micrometer 指标程序

Micrometer 概述

M​icrometer 是一个指标门面

M​icrometer 可以让你在业务代码里只写一次指标收集逻辑，接下来根据实际部署环境切换后端，无需改动业务代码。