The letsencrypt-internal ClusterIssuer does not exist on the cluster. Only letsencrypt-prod and letsencrypt-staging are available. Both use DNS-01 via Cloudflare for the mk-labs.cloud zone, so they work for internal-only hosts with no public HTTP reachability. Fixes: https://github.com/volcengine/openviking/issues/... Closes: kanban task t_1c2cc2db