Expand description
ACME state storage: account credentials, per-certificate key+chain, pending TLS-ALPN-01 key authorizations, and the renewal lease that keeps N gateway instances from ordering the same certificate at once.
Backends: fs::FsCertStorage (single node, or a shared volume for certs —
not for challenges) and, behind the redis-store feature,
redis::RedisCertStorage (cluster-ready; keys sealed at rest).