When an Ingress resource is deleted, its corresponding metrics remain in Prometheus and are not cleaned up automatically.

[tengxunchao]

Environment：
Kubernetes version: 1.24.17
nginx-ingress version: v1.12.1

Problem
When an Ingress resource is deleted, its corresponding metrics remain in Prometheus and are not cleaned up automatically. These stale metrics only disappear after restarting the nginx-ingress controller.

Question
Is there a way to ensure that these metrics are no longer exposed to Prometheus without restarting nginx-ingress?
Are there any configuration options in nginx-ingress to optimize this behavior?
Or, is there a better recommended approach for handling stale Ingress metrics?

The Ingress corresponding to sit-prometest22.sss.cn in the picture has already been deleted, but Prometheus is still scraping metrics related to it.

[k8s-ci-robot]

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