Checkmk special agent for monitoring Hetzner Storage Boxes via the Hetzner Console API. Collects and evaluates storage usage (used_bytes, used_percent), snapshot usage (snapshot size and count), subaccount usage (subaccounts_count), Storage Box status, access settings (Samba, SSH, WebDAV, ZFS, external reachability), delete protection, snapshot plan configuration, and API health. Includes built-in API result caching with configurable TTL, cache age reporting, visible stale cache status, stale cache fallback during API failures, and reduced API load for frequent Checkmk executions. Supports configurable WARN/CRIT thresholds, access setting validation, snapshot/subaccount limit monitoring, and native Checkmk graphing. Compatible with Checkmk 2.4.0 (CRE/CEE) and 2.5.0 (Pro/Ultimate).