Actuator

引入依賴spring-boot-starter-actuator，通過endpoint來暴露HTTP或JMX來監管應用
通過http://localhost:8080/actuator，可以查看所有endpoints，eg：

/actuator/health, /actuator/info, /actuator/metrics, /actuator/loggers

/health：健康指數檢查

通過management.endpoint.health.show-details=always可以顯示詳細的健康信息。
實現HealthIndicator接口，或繼承AbstractHealthIndicator類自定義健康指標

@Component
public class CustomerHealthIndicator extends AbstractHealthIndicator {
    @Override
    protected void doHealthCheck(Health.Builder builder) throws Exception {
        builder.up().withDetail("xxx", "xxx xxx");
    }
}

/info：應用基本信息

通過META-INF/build-info.properties獲得編譯信息，通過git.properties獲得git信息

# INFO ENDPOINT CONFIGURATION
info:
  app:
    name: @project.name@
    description: @project.description@
    version: @project.version@
    encoding: @project.build.sourceEncoding@
    java:
      version: @java.version@

Automatic Property Expansion：擴展maven工程的properties

授權訪問

通過HTTP認證保護Actuator Endpoints的安全：spring-boot-starter-security

Micrometer

示例學習：Spring Boot Metrics監控之Prometheus&Grafana