sentinel暴露的prometheus指标，没有数据

[heqs]

配置如下
management:
endpoints:
web:
exposure:
include: "*"
endpoint:
shutdown:
enabled: true
metrics:
enabled: true
prometheus:
enabled: true
metrics:
tags:
application: it-${spring.application.name}
export:
prometheus:
enabled: true
pushgateway:
base-url: 192.168.1.121:9091
push-rate: 5s
job: it-${spring.application.name}
enabled: true
将这个类https://app.codecov.io/gh/alibaba/Sentinel/pull/735/blob/sentinel-extension/sentinel-metric-prometheus/src/main/java/com/alibaba/csp/sentinel/metric/extension/prometheus/PrometheusMetricExtension.java
复制到我的项目，并通过SPI方式引入，可以成功将指标数据推送到pushgateway，但是没有sentinel的相应指标(pushgateway的指标地址http://192.168.1.121:9091/metrics)，而且看了项目暴露的prometheus指标（http://localhost:8081/actuator/prometheus），有sentinel响应的注释，但是没有数据（接口有访问，debug也有执行到onPass），如下
#HELP sentinel_pass_requests_total total pass requests.
#TYPE sentinel_pass_requests_total counter
#HELP sentinel_success_requests_total total success requests.
#TYPE sentinel_success_requests_total counter
#HELP sentinel_block_requests_total total block requests.
#TYPE sentinel_block_requests_total counter
只有注释行没有数据，

[sczyh30]

可以尝试下社区近期的 PR: #3173