docs(audit): document observability stack + Saturday OAM day plan

Operator-defined monitoring architecture (no tool duplication):
- Beszel (Cloudron VPS): CPU/RAM/disk metrics on all Proxmox hosts via Tailscale
- Uptime Kuma (Cloudron VPS): up/down alerting via Pushover
- LibreNMS (VMID 104, on-prem): SNMP polling for switches (non-Tailsale gear)
- Home Assistant (VMID 100, on-prem): power/temp instrumentation + alerting

Saturday 2026-08-01 is designated OAM Day: goal is 100% instrumentation
coverage across all four tools + centralized syslog.

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2026-07-30 23:02:11 -05:00
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@@ -171,6 +171,10 @@ infrastructure, Proxmox cluster ops, and k8s control plane.
- Audit VM cache modes (writethrough → writeback for NFS)
**Other:**
- **Saturday OAM Day (2026-08-01):** 100% instrumentation coverage — Beszel
(metrics) on all hosts, Uptime Kuma (up/down) → Pushover alerts, LibreNMS
(SNMP) for switches, Home Assistant (power/temp) for physical infra,
centralized syslog (tool TBD)
- Investigate core-sw01 port errors (g9/g38/g26)
- k8s: join wnodes, label by workload class
- k8s deferred: ETL tooling, HPC scheduler, vcluster policy