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slice 9: host-health view on the monitoring page (v0.39.0)

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Add agentapi HostMetrics() + a thin /api/host-metrics proxy to the agent's
new GET /host/metrics, and a 'Szerver allapota (gazdagep)' card on the
monitoring page rendering host CPU%/load/mem/CPU-temp(n/a)/uptime + per-
storage capacity bars (thin-pool fill, disk temp/wear). Polls every 8s.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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authentik Default Admin
2026-06-10 16:16:15 +02:00
parent 4c9065381b
commit d8d1e17758
8 changed files with 406 additions and 35 deletions
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CHANGELOG.md
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## Changelog
### v0.39.0 — slice 9: host metrics in the controller (customer host-health view) (2026-06-10)
The customer-facing half of slice 9. Pairs with `felhom-agent` v0.14.0. The de-privileged controller (slice 8C) sees only its own cgroup, so it can't read the host. The monitoring page now shows the **real Proxmox box** — CPU% + load, memory used/total, **CPU/chassis temperature** (or "n/a" when the hardware exposes none), uptime, and **per-storage capacity** (used/total bar, thin-pool fill, disk temp/wear) — proxied from the agent's new `GET /host/metrics`.
#### Added (`internal/agentapi`)
- **`Client.HostMetrics(ctx)`** — calls the agent's `GET /host/metrics` over the leaf-pinned, per-guest-token channel (same client as the 8C disk proxy) and returns `HostMetricsResponse` (host block + per-storage targets). New mirror structs `HostMetrics` (with nullable `CPUTempC`), `StorageTarget`, `ThinPoolFill`, `SmartSummary` (subset — only the fields the UI renders; unknown wire keys ignored).
#### Added (`internal/web`)
- **`ServeHostMetricsAPI`** (`agent_host_metrics_handler.go`) — a thin read-only proxy: `GET /api/host-metrics` → agent `GET /host/metrics`. Returns the `{ok,data,error}` envelope; 503 when the local API is not configured (unprovisioned guest), 502 on an agent error. Wired in `main.go` behind `RequireAuth` (GET-only → no CSRF wrapper).
- **Monitoring view** (`templates/monitoring.html`): a new **"Szerver állapota (gazdagép)"** card at the top renders the agent's host block + per-storage capacity bars (reusing the existing `system-bar`/`storage-item` styling). `cpu_temp_c: null` renders as **"n/a"** cleanly. Polls `/api/host-metrics` every **8 s** while the page is open (the host view is a live snapshot, distinct from the controller's own 60 s metric charts); shows a yellow "nem elérhető" banner when the agent is unreachable.
#### Tests
- `agentapi/host_metrics_test.go`: decodes host + storage (thin-pool, SMART temp + NVMe wear), USB drive's null SMART, and a null `cpu_temp_c` → nil pointer.
### v0.38.0 — slice 8B.2: quiesce downtime optimization (resume at `snapshotted`) (2026-06-10)
The controller half of slice 8B.2. Pairs with `felhom-agent` v0.13.0. The quiesce loop now resumes