Flink kubernetes operator 部署prometheus监控

版本：Flink kubernetes operator1.7.0
问题：在参考文章https://blog.youkuaiyun.com/wu892355227/article/details/129334218?spm=1001.2014.3001.5506进行如下PrometheusReporter配置后，在prometheus webui报错：Get "http://IP:9999/metrics": dial tcp IP:9999: connect: connection refused

defaultConfiguration:
  # ...
  flink-conf.yaml: |+
    # Flink Config Overrides
    # ... (other configurations)

    # Add Prometheus reporter configuration
    metrics.reporters: prom
    kubernetes.operator.metrics.reporter.prom.class: org.apache.flink.metrics.prometheus.PrometheusReporter
    kubernetes.operator.metrics.reporter.prom.port: 9999
  # ...

metrics: 
  port: 9999

排查：执行kubectl logs -n flink -l app.kubernetes.io