The alert rules had no notification route, so the 2026-10-01 trickle was only visible to someone looking at a dashboard. The box now runs an alertmanager service that posts critical and warning alerts to the Discord webhook zlay already pages into, and drops info alerts. Adds the in-repo sources for the box's alertmanager.yml and prometheus.yml, and documents the webhook file, the rule-reload procedure (restart, not up -d), and a one-command end-to-end test. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TTKhZqkDD8TLAvjhzi9HLf