What would you like to be cleaned:

When running kustomize build config/default/ with CertManager enabled, we see the following warning:

# Warning: 'vars' is deprecated. Please use 'replacements' instead. [EXPERIMENTAL] Run 'kustomize edit fix' to update your Kustomization automatically.
2026/02/12 19:48:34 well-defined vars that were never replaced: VISIBILITY_CERTIFICATE_NAMESPACE,CERTIFICATE_NAME,CERTIFICATE_NAMESPACE,VISIBILITY_CERTIFICATE_NAME

Why is this needed:

To avoid using a deprecated feature, and as mentioned here, it will not be included in the kustomize.config.k8s.io/v1 Kustomization API.

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

1. config/default/kustomization.yaml: uncomment certmanager resource, prometheus resource, and the vars: block
2. config/components/prometheus/kustomization.yaml: uncomment the patches: block

kustomize build config/default/