metrics 模块按说明的操作，没发现监控到数据

# metrics settings
metrics {
enabled = true
registryType = "compact"
# multi exporters use comma divided
exporterList = "prometheus"
exporter-prometheus-port = 9898
}
我用prometheus的9898端口访问不到数据，一个空白页

Start by reproducing the reported metrics configuration with the Prometheus exporter enabled on port 9898, then inspect the metrics module and exporter entry point mentioned by the configuration. Confirm whether the endpoint is reachable and returns metrics rather than a blank page; the issue is done when the documented setup exposes data successfully or the configuration mismatch is clearly identified.

Written by the indexing model from the issue text.