Lands sections 6 and 8 of relocate-brouter-to-dedicated-host on top
of the host compose in #291.
## Observability (section 6)
- **Prometheus**: new `brouter-cadvisor` job scraping
`10.0.1.10:8080` over the vSwitch, labeled `host="brouter"`.
- **cAdvisor sidecar** on the dedicated host's compose
(`--docker_only --whitelisted_container_labels=trails.cool.service`)
so metrics only cover trails containers, never the operator's
unrelated workloads on the shared box.
- **Promtail sidecar** on the dedicated host, Docker SD with relabel-
drop on missing `trails.cool.service` label, pushing to flagship
Loki at `http://10.0.0.2:3100/loki/api/v1/push`.
- **Flagship compose**: Loki now publishes port 3100 on the vSwitch
IP only (10.0.0.2:3100) — Hetzner Cloud firewall blocks it from
the public internet.
- **Grafana dashboard**: `brouter.json` — scrape up/down, request
rate (from Planner-side `brouter_request_duration_seconds`),
p50/p95/p99, container memory/CPU, Loki logs panel.
- **Alert**: `brouter-scrape-down` fires on
`up{job="brouter-cadvisor"} < 1 for 2m`; `noDataState: Alerting`
so a total scrape failure still pages.
Operator needs one UFW rule on the dedicated host for the cAdvisor
port — documented in `infrastructure/brouter-host/README.md`.
## Documentation (section 8)
- `CLAUDE.md` — hosts table + updated deployment table with SSH
targets per workflow; BRouter host SSH is `-p 2232 trails@...`,
different key.
- `docs/architecture.md` — Hosting section rewritten to cover both
hosts, vSwitch boundary, and the observability-scoping rationale
for the shared dedicated host.
- `docs/deployment.md` (new) — full operator runbook: host layout,
first-time BRouter provisioning, SOPS rotation (including the
macOS `SOPS_AGE_KEY_FILE` gotcha), cutover procedure with
rollback, manual workflow triggers.
Task 8.4 (infrastructure/README.md) skipped: that file doesn't
exist and the ground is covered by brouter-host/README.md +
docs/deployment.md.
## Validation
- `docker compose config` on both the flagship and brouter-host
compose files — both validate.
- `pnpm typecheck`, `pnpm lint`, `pnpm test` — all clean (full
turbo cache hits; no code changes in this commit).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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