[BUG] sentinel dashboard部署在k8s上看不到流量数据

## Issue Description

Type: *bug report*

### Describe what happened
网关、服务、sentinel dashboard全部都部署在k8s上，现在访问服务看到流量信息

### Describe what you expected to happen

### How to reproduce it (as minimally and precisely as possible)

1.
2.
3.

### Tell us your environment

### Anything else we need to know?

Start by reproducing the Sentinel dashboard deployment on Kubernetes and compare it with the service and gateway deployment described in the issue. Check why traffic data is absent, then document a reproducible configuration and verify that traffic appears in the dashboard.

Written by the indexing model from the issue text.