P1 infra: add Prometheus and Grafana to compose

[SlavaKuntsov]

Phase / Priority / Area

Phase 14 · Priority P1 · Area infra

Зависимости

Blocked by: #10 (предположение)

Scope

deploy/docker-compose.yml:1, deploy/prometheus/prometheus.yml (new), deploy/grafana/ (new), .env.example

Goal

База наблюдаемости.

Acceptance Criteria

• Сервисы prometheus:9090, grafana:3001, scrape gateway/metadata/upload/transcoder/rabbitmq/minio
• http://localhost:9090/-/healthy отвечает

Проверки

make up && curl :9090/-/healthy, make lint-*

Out of scope

Алерты (#13)

[SlavaKuntsov]

Pull request opened

#39 — will auto-close via Closes #12 on merge.

Verification

• make lint-go — 0 issues
• make lint-py — success
• make lint-front — ok
• make test-go/test-py — pass
• make up --build -d — all Healthy (prometheus, loki, grafana)
• make e2e — PASS
• curl -H X-Request-ID:test123 → logs contain trace_id; Loki query {service="gateway"} |= "test123" — success

Remaining risks

• Loki allow_structured_metadata false (v11), Promtail docker.sock, rabbitmq_queue_depth Gauge 0 — см. PR Risks