kubesphere 3.0 使用集群已有prometheus 监控数据异常

环境：
k8s version 1.18

• thanos + prometheus
  kubesphere 3.0

操作步骤：

• 参考文档：https://v3-0.docs.kubesphere.io/zh/docs/faq/observability/byop/#step-4-change-kubespheres-monitoring-endpoint

现象：node监控数据丢失

通过组件日志未发现有用信息,相关配置如下
#kubectl edit cm -n kubesphere-system kubesphere-config
...
servicemesh:
istioPilotHost: http://istio-pilot.istio-system.svc:8080/version
jaegerQueryHost: http://jaeger-query.istio-system.svc:16686
servicemeshPrometheusHost: http://prometheus-headless.thanos.svc:9090
...
monitoring:
endpoint: http://prometheus-headless.thanos.svc:9090
...
求大佬指点