docs: add private load balancers + DNS-01 credentials guide#333
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Summary
Documents the private NGINX ingress controller + DNS-01 cluster issuer that ships behind the internal NLB feature flag, including the new per-cluster DNS provider credentials endpoints.
Context
The upstream change introduces an internal-only
ingress-nginxcontroller (ingress classnginx-private) plus a cert-managerClusterIssuerthat solves ACME challenges via DNS-01, so private load balancers can serve managed TLS without being publicly reachable. The feature is declared on the cluster contract as anAdditionalLoadBalancerwithnetwork_access: PRIVATEand adns_provider_config(Cloudflare today). Three new API endpoints manage the per-cluster DNS provider API token:GET /api/v2/projects/{project_id}/clusters/{cluster_id}/dns/credentialsPOST /api/v2/projects/{project_id}/clusters/{cluster_id}/dns/credentialsDELETE /api/v2/projects/{project_id}/clusters/{cluster_id}/dns/credentialsContract writes reject unsupported DNS providers and duplicate additional load balancer entries.
Changes
applications/configure/private-load-balancers.mdxcovering when to use a private LB, prerequisites (Cloudflare API token scopes), how to store / check / rotate / delete DNS credentials, the cluster contract shape, and troubleshooting.internal_nlb_enabledflag, so per workflow guidance the page is not added tomint.json.cc @MauAraujo for review.