在使用SimpleClientHttpRequestFactory时，如何使用标准Spring Boot的普罗米修斯RestTemplate指标定制RestTemplate？

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient_spring_boot</artifactId>
    <version>0.12.0</version>
</dependency>
<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient_hotspot</artifactId>
    <version>0.12.0</version>
</dependency>
<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient_httpserver</artifactId>
    <version>0.12.0</version>
</dependency>

management.endpoints.web.exposure.include=prometheus
management.metrics.export.prometheus.enabled=true

import io.prometheus.client.Counter;
import io.prometheus.client.Histogram;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;
import java.net.URI;

public class PrometheusRestTemplate extends RestTemplate {

    private static final Counter requestCounter = Counter.build()
            .name("http_requests_total")
            .help("Total HTTP requests.")
            .register();

    private static final Histogram requestLatency = Histogram.build()
            .name("http_request_latency_seconds")
            .help("HTTP request latency in seconds.")
            .register();

    public PrometheusRestTemplate() {
        super(new SimpleClientHttpRequestFactory() {
            @Override
            protected ClientHttpResponse executeInternal(ClientHttpRequest request, URI uri) throws IOException {
                long start = System.nanoTime();
                ClientHttpResponse response = super.executeInternal(request, uri);
                long end = System.nanoTime();
                double latency = (end - start) / 1_000_000_000.0;

                requestCounter.inc();
                requestLatency.observe(latency);

                return response;
            }
        });
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AppConfig {

    @Bean
    public RestTemplate restTemplate() {
        return new PrometheusRestTemplate();
    }
}