servicemonitor资源对象的labels为k8s-app: application-jmx
在prometheus-k8s资源对象的serviceMonitorSelector中关联了serviceMonitor的labels
通过kubectl -n kubesphere-monitoring-system port-forward –address=0.0.0.0 prometheus-k8s-0 39090:9090暴露prometheus，通过在service discovery中并没发现相应的配置
