51 lines
2 KiB
Markdown
51 lines
2 KiB
Markdown
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---
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okf: "0.1"
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type: service
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visibility: private
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status: active
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updated: 2026-06-24
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links:
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- ../decisions/fleet-prometheus-osobny-od-prom.md
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- ../runbooks/fleet-prometheus-deploy.md
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---
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# fleet-prometheus
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Prometheus instance that is the **source of truth for fleet liveness**. Runs on
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the **VPS** (ingress / control-plane host) and is reachable only over Tailscale.
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This is a **clean scaffold**: right now it scrapes only itself and the VPS-local
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`node_exporter`. The fleet targets, liveness rules, and alerting integration are
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deliberately separate, later steps (see *Next steps* below).
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## Stack
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| Container | Image | Purpose |
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|--------------------|-------------------------|--------------------------------|
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| `fleet-prometheus` | `prom/prometheus:v3.5.0`| Fleet liveness Prometheus (9090) |
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## Placement & exposure
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- **Node:** VPS (`ubuntu-4gb-hel1-1`, Tailscale `100.95.58.48`).
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- **Exposure:** `tailscale-internal` — exposed exactly like `control-plane`: a
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plain published `9090:9090` port with **no** public npm reverse-proxy entry.
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Reachability is constrained to the Tailscale mesh at the VPS firewall layer.
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Do **not** add this to npm or public DNS.
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- **Memory:** `mem_limit: 512m`. `oom_score_adj: 200` (positive) — fleet
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monitoring is less critical than the control-plane (`-900`), so it is a
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sacrificial OOM victim *before* the control-plane, never after.
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- **Retention:** `15d` / `2GB` (whichever hits first) — tight on purpose.
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## Data
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TSDB lives in the named volume `fleet-prometheus_tsdb` → `/prometheus`.
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## Next steps (NOT done in this scaffold)
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- **Fleet targets:** add the `100.x` Tailscale `node_exporter`s for SATURN,
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SOLARIA, PIHA, CHELSTY to the `fleet-node` job.
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- **Liveness rules:** `rule_files` with `up == 0 for: 5m` (placeholder is
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commented in `prometheus.yml`).
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- **Alerting:** Alertmanager wiring, and/or `brain-watchdog` querying the
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firing alerts API → Telegram (placeholder commented in `prometheus.yml`).
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