我将kamon（kamon.io）与playframework2.8结合使用。
我试着根据“play framework instrumentation”和“exposing metrics for prometheus”设置kamon，然后它将这些指标公开为prometheus格式。
但是，它只公开了与服务器相关的度量，如下所示：

span_processing_time_seconds_bucket{operation="/",span_kind="server",http_status_code="200",error="false",le="0.005",component="play.server.akka-http",http_method="GET"} 2.0
span_processing_time_seconds_bucket{operation="/",span_kind="server",http_status_code="200",error="false",le="0.01",component="play.server.akka-http",http_method="GET"} 3.0
span_processing_time_seconds_bucket{operation="/",span_kind="server",http_status_code="200",error="false",le="0.025",component="play.server.akka-http",http_method="GET"} 3.0
span_processing_time_seconds_bucket{operation="/",span_kind="server",http_status_code="200",error="false",le="0.05",component="play.server.akka-http",http_method="GET"} 3.0
span_processing_time_seconds_bucket{operation="/",span_kind="server",http_status_code="200",error="false",le="0.075",component="play.server.akka-http",http_method="GET"} 3.0
span_processing_time_seconds_bucket{operation="/",span_kind="server",http_status_code="200",error="false",le="0.1",component="play.server.akka-http",http_method="GET"} 3.0

我想得到客户端（即wsclient）的度量，特别是请求的处理时间。
我能得到这些指标吗？如果是，我该怎么做？
基本项目是play2.8.xhelloworld项目。完整项目如下：https://github.com/moznion/play-kamon-prometheus-sample
代码和配置提示如下：
构建.sbt

name := """play-java-hello-world-tutorial"""
organization := "com.example"

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayJava, JavaAgent)

scalaVersion := "2.13.5"
val kamonVersion = "2.1.15"

libraryDependencies += guice
libraryDependencies += ws
libraryDependencies += "io.kamon" %% "kamon-bundle" % kamonVersion
libraryDependencies += "io.kamon" %% "kamon-prometheus" % kamonVersion

应用程序.conf

play.http.secret.key="secret-secret-secret"

kamon {
  prometheus {
    include-environment-tags = true
    embedded-server {
      hostname = 0.0.0.0
      port = 9095
    }
  }
}

插件.sbt

addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.8.8")
addSbtPlugin("io.kamon" % "sbt-kanela-runner-play-2.8" % "2.0.10")

家庭控制器.java

package controllers;

import play.mvc.*;
import play.libs.ws.WSClient;
import com.google.inject.Inject;
import java.util.concurrent.ExecutionException;

public class HomeController extends Controller {
    private static WSClient ws;

    @Inject
    public HomeController(final WSClient wsClient) {
        this.ws = wsClient;
    }

    public Result index() throws ExecutionException, InterruptedException {
        return ok(ws.url("http://127.0.0.1:9095/metrics").get().toCompletableFuture().get().getBody());
    }
}