Two cardinality/volume cuts to keep Prometheus storage sustainable
within the size budget:
- scrape_interval 5s -> 20s (evaluation_interval too). 5s tripled the
sample volume vs the 15s default for no benefit on a single-box
deployment; all rules use [5m] windows and for: >= 1m.
- Drop high-cardinality cAdvisor families we never chart or alert on
(container_fs_*, blkio_*, tasks_state, memory_failures_total,
memory_numa_*, network_tcp*/udp*) on both cadvisor jobs. Dashboards
only use container CPU, memory, and start_time. This was the bulk of
the ~12.4k active series.
Validated with `promtool check config`.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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>
Exporters:
- postgres_exporter: DB connections, transactions, cache hit ratio, query stats
- node_exporter: host CPU, memory, disk, network
- cAdvisor: per-container CPU and memory usage
PostgreSQL:
- Enable pg_stat_statements for query-level performance tracking
- Track index scans vs sequential scans, cache hit ratio
Dashboard (service-health.json):
- DB: connections, size, transactions/s, slow queries, cache hit ratio, index usage
- Host: disk gauge, CPU, memory, network I/O, disk I/O
- BRouter: request latency p50/p95/p99, container CPU + memory
- All containers: CPU and memory comparison
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Health endpoints:
- /api/health (Journal) and /health (Planner) with DB connectivity check
- Docker healthchecks updated to use app health endpoints
Structured logging:
- Pino with JSON output in production, pretty-print in dev
- Request logging middleware in Planner (method, path, status, duration)
- Replaced console.log/error with structured logger in email and auth flows
Prometheus metrics:
- prom-client with default Node.js metrics + custom histograms/gauges
- /metrics endpoints on both apps
- http_request_duration, planner_active_sessions, brouter_request_duration
Monitoring stack:
- Prometheus, Loki, Grafana containers in docker-compose
- Grafana provisioned with datasources, dashboards, and alert rules
- Caddy access logging (JSON to stdout for Loki)
- grafana.trails.cool with basic auth via Caddy
Dashboards and alerting:
- Overview: request rate, error rate, latency p50/p95/p99
- Planner: active sessions, connected clients, BRouter latency
- Infrastructure: memory, CPU, event loop lag
- Alerts: disk >80%, app down 2min, error rate >5%
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
