**Is your feature request related to a problem? Please describe.** Currently pulling metrics from Flink Runner is not implemented yet. **Describe the solution you'd like** Use [Flink REST API](https://ci.apache.org/projects/flink/flink-docs-release-1.5/monitoring/rest_api.html) to pull metrics from
Is your feature request related to a problem? Please describe.
Currently pulling metrics from Flink Runner is not implemented yet.
Describe the solution you'd like
Use Flink REST API to pull metrics from