我已經(jīng)使用Dropwizard實現(xiàn)了一個 Java Web 服務(wù)?，F(xiàn)在我希望它也公開Prometheus metrics。我遵循了這個非常直接的例子。但是，位于http://localhost:9090/metrics的端點仍未公開。這是相關(guān)的代碼：中的依賴項pom.xml：    <dependency>        <groupId>io.prometheus</groupId>        <artifactId>simpleclient_dropwizard</artifactId>        <version>0.5.0</version>    </dependency>    <!-- https://mvnrepository.com/artifact/io.prometheus/simpleclient_servlet -->    <dependency>        <groupId>io.prometheus</groupId>        <artifactId>simpleclient_servlet</artifactId>        <version>0.5.0</version>    </dependency>Java代碼：import io.dropwizard.Application;import io.dropwizard.setup.Bootstrap;import io.dropwizard.setup.Environment;import io.prometheus.client.CollectorRegistry;import io.prometheus.client.dropwizard.DropwizardExports;import io.prometheus.client.exporter.MetricsServlet;[...]public class MyApplication extends Application<MyServiceConfiguration> {@Overridepublic void run(final MyServiceConfiguration configuration,        final Environment environment) {    final MyServiceResource resource = createResource(configuration);    environment.jersey().register(resource);    registerHealthChecks(environment, resource);    registerMetrics(environment);}private void registerMetrics(Environment environment) {    CollectorRegistry collectorRegistry = new CollectorRegistry();    collectorRegistry.register(new DropwizardExports(environment.metrics()));    environment.admin().addServlet("metrics", new MetricsServlet(collectorRegistry))            .addMapping("/metrics");}任何指向我做錯了什么的指針？