Hope add upstream metrics label for node

[zyayun]

nginx prometheus metrics, upstream no backend server ip info

Q1: some monitor info,need upstream backend ip label

Example: (upstream metrics add node label to select backend pod ip or podName )
client -> ingress-nginx -> upstream backend -> service -> endpoint(node)

like:

[k8s-ci-robot]

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[github-actions]

This is stale, but we won't close it automatically, just bare in mind the maintainers may be busy with other tasks and will reach your issue ASAP. If you have any question or request to prioritize this, please reach #ingress-nginx-dev on Kubernetes Slack.