Java Micrometer @Timed 注释在简单的公共和私有(服务)方法上

我正在try 使用测微计@Timed注释应用普罗米修斯度量标准.

举个例子:

@RestController
public class TestController {

    @GetMapping("/test")
    @Timed("test-endpoint") //does create prometheus metrics
    public String test() {
        privateMethod();
        publicMethod();
        return "test";
    }

    @Timed("test-private") //does NOT create prometheus metrics
    private void privateMethod() {System.out.println("private stuff");}

    @Timed("test-public") //does NOT create prometheus metrics
    public void publicMethod() {System.out.println("public stuff");}
}

创建以下指标:

...
# HELP test_endpoint_seconds  
# TYPE test_endpoint_seconds summary
test_endpoint_seconds_count{class="com.example.micrometerannotationexample.TestController",exception="none",method="test",} 1.0
test_endpoint_seconds_sum{class="com.example.micrometerannotationexample.TestController",exception="none",method="test",} 0.0076286
# HELP test_endpoint_seconds_max  
# TYPE test_endpoint_seconds_max gauge
test_endpoint_seconds_max{class="com.example.micrometerannotationexample.TestController",exception="none",method="test",} 0.0076286
...

找不到@Timed("test-private")和@Timed("test-public")的指标，为什么？

注意:我在this github thread上读到，Spring Boot无法识别任意方法上的@Timed个注释，需要手动配置TimedAspect Bean才能工作.我试过了，但还是没有效果.

@Configuration
@EnableAspectJAutoProxy
public class MetricsConfig {
    @Bean
    public TimedAspect timedAspect(MeterRegistry registry) {
        return new TimedAspect(registry);
    }
}

To try this locally see necessary gist 100