如何生成WebClient直方图指标

Question

我想获取有关从后端服务到其他第三方服务的呼叫的指标（呼叫数，95%）。我正在使用WebClient进行这些http调用。我找不到启用WebClient直方图指标的特定属性。

我添加了MetricsWebClientFilterFunction来生成指标。这就是逻辑-

WebClient-WebClient=WebClient。生成器（）。baseUrl（服务URL）。过滤器（新MetricsWebClientFilterFunction（meterRegistry，新DefaultWebClientExchangeTagsProvider（），“webClientCalls”，自动定时器。已启用）。build（）

它只生成计数和总和指标。如何为WebClient调用生成直方图指标？

这是endpoint /actuator/prometheus输出-

webClientCalls\u seconds\u count{clientName=“service\u url”，method=“GET”，output=“SUCCESS”，status=“200”，uri=“/hello”，}1.0 webClientCalls\u seconds\u sum{clientName=“service\u url”，method=“GET”，output=“SUCCESS”，status=“200”，uri=“/hello”，}2.301044994

webClientCalls\u seconds\u max{clientName=“service\u url”，method=“GET”，output=“SUCCESS”，status=“200”，uri=“/hello”，}0.0




Answer 1

只需实现自动定时器接口并覆盖应用方法。

public final class AutoTimerHistogram implements AutoTimer {
  @Override
  public void apply(Timer.Builder builder) {
    builder
        .serviceLevelObjectives(
            Duration.ofMillis(100),
            Duration.ofMillis(500),
            Duration.ofMillis(800),
            Duration.ofMillis(1000),
            Duration.ofMillis(1200))
        .minimumExpectedValue(Duration.ofMillis(100))
        .maximumExpectedValue(Duration.ofMillis(10000));
  }
}

然后将其添加到MetricsWebClientFilterFunction中

    MetricsWebClientFilterFunction metricsFilter =
        new MetricsWebClientFilterFunction(
            meterRegistry,
            new DefaultWebClientExchangeTagsProvider(),
            "custom.web.client",
            autoTimerHistogram);

# TYPE custom_web_client_seconds histogram
custom_web_client_seconds_bucket{clientName="login.microsoftonline.com",method="POST",outcome="SUCCESS",status="200",uri="/common/oauth2/v2.0/token",le="0.1",} 0.0
custom_web_client_seconds_bucket{clientName="login.microsoftonline.com",method="POST",outcome="SUCCESS",status="200",uri="/common/oauth2/v2.0/token",le="0.5",} 0.0
custom_web_client_seconds_bucket{clientName="login.microsoftonline.com",method="POST",outcome="SUCCESS",status="200",uri="/common/oauth2/v2.0/token",le="0.8",} 1.0
custom_web_client_seconds_bucket{clientName="login.microsoftonline.com",method="POST",outcome="SUCCESS",status="200",uri="/common/oauth2/v2.0/token",le="1.0",} 1.0
custom_web_client_seconds_bucket{clientName="login.microsoftonline.com",method="POST",outcome="SUCCESS",status="200",uri="/common/oauth2/v2.0/token",le="1.2",} 1.0
custom_web_client_seconds_bucket{clientName="login.microsoftonline.com",method="POST",outcome="SUCCESS",status="200",uri="/common/oauth2/v2.0/token",le="+Inf",} 1.0
custom_web_client_seconds_count{clientName="login.microsoftonline.com",method="POST",outcome="SUCCESS",status="200",uri="/common/oauth2/v2.0/token",} 1.0
custom_web_client_seconds_sum{clientName="login.microsoftonline.com",method="POST",outcome="SUCCESS",status="200",uri="/common/oauth2/v2.0/token",} 0.646656087