KantTresor instances (from 1.82.0) report to /api/kanttresor/melden with the same key-then-HMAC protocol. The new tab lists them with tenants, disk usage and failing services; it never offers or accepts an update order, since KantTresor is updated with ./update.sh on the server. See ADR 124. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>