Brandyn / Techy
09882833a0
Alerting is vmalert against its stats endpoints plus Alertmanager for delivery, and that covers log conditions only: disk, load and restart loops are metrics and additionally need VictoriaMetrics over the four taps. Four containers for the full picture, which is why a forty-line timer posting to the Discord webhook comes first. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
99 lines
7.0 KiB
Markdown
99 lines
7.0 KiB
Markdown
# Logging framework
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Decided 2026-11-01, and the store chosen on 2026-11-03: **VictoriaLogs**, on the `diag.BASE` host with its UI
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at `/logs` (Phase 14 in `CommunityDiscordMedia.md`). Everything upstream of the store was fixed first, so
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adopting it is a collector config rather than a code change.
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## Where the lines come from (the only two taps a collector needs)
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| Tap | Holds | Read with |
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|---|---|---|
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| **journald** | our systemd units: `dumpd`, `normalize-sweep`, `trash-purge`, `deploy-pending`, `vgdeband` (transient), `deploy.sh` output | `journalctl -u <unit>`; collectors: Alloy `loki.source.journal`, Vector `journald`, VictoriaLogs journald ingestion, Netdata's journal plugin |
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| **Docker json-file logs** | every container (`docker-compose.yml`), rotated 5 × 50 MB each | `docker logs <name>`; collectors read `/var/lib/docker/containers/*/*-json.log` and get the container **labels** below for free |
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Every collector on the shortlist reads both. Metrics are the same story: see the taps table below — all four endpoints are on now, on loopback.
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## Metrics taps (all Prometheus text format, loopback only — scrape them with Alloy, vmagent or Netdata)
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| endpoint | what | from |
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|---|---|---|
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| `http://127.0.0.1:9100/metrics` | host: CPU, RAM, disk space + I/O, network, load, md RAID | node_exporter (host network, pid host) |
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| `http://127.0.0.1:9101/metrics` | per container: CPU, memory, network, block I/O — labelled with `vanguard.service` / `vanguard.category` | cAdvisor |
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| `http://127.0.0.1:9998/metrics` | MediaMTX: per path bytes/s, readers, publishers, WebRTC/HLS/RTMP sessions, dropped packets | MediaMTX `metrics: yes` |
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| `http://127.0.0.1:2019/metrics` | Caddy: requests by host/status, durations, TLS | Caddy admin API (`servers { metrics }`) |
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None of these are reachable from outside (loopback binds; nothing in the firewall). Nothing evaluates them yet:
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metric alerting needs VictoriaMetrics scraping them plus vmalert, and log alerting needs vmalert against
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VictoriaLogs' stats endpoints with Alertmanager for delivery (Phase 14). Thresholds to start with: disk on
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`/srv` > 85 %, load > cores for 15 min, a container restarting, MediaMTX dropped packets rising on a live path.
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## Container labels (set in `docker-compose.yml`, `x-logging` anchor + `labels:`)
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`vanguard.service` = the service name, `vanguard.category` = one of the categories below. A collector turns these
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into stream labels without parsing a single line.
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## Categories = the questions people ask
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| category | services / components | correlation key |
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|---|---|---|
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| `stream` | mediamtx (path ready/closed, recorder, WebRTC sessions, the on-ready hook's `event=mirror`), dumpd `publish_allow` / `publish_deny`, sweep `event=published` | `stream` = `user/Title` |
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| `auth` | caddy access logs (status, `X-Authentik-Username`), authentik-server/worker events, gitea OIDC | `user` |
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| `media` | sweep verdicts / timecode / deband / failed, vgdeband, jellyfin, copyparty | `file` |
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| `intake` | syncthing (`folder.id`), dumpd `clips_setup`, `quota_*` | `folder` = `clips-<user>` |
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| `infra` | mariadb, caddy TLS/ACME, container restarts, disk | host only |
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| `deploy` | deploy.sh, dumpd `deploy_*`, `bot_deploy_*` and `bot_env_*` (the bot's CI posting a release bundle and its settings), act_runner | `rev` |
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| `code`, `bot` | gitea, discord-bot | — |
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## Labels vs fields
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- **Labels** (low cardinality, what you filter by): `service`, `category`, `level`, `unit`. A dozen values each.
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- **Fields** (parsed at query time, what you search in): `stream`, `user`, `file`, `folder`, `session`, `status`, `ip`, `event`.
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Thousands of values — fine as fields, ruinous as labels (Loki). VictoriaLogs indexes every word anyway.
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## Our own line format: logfmt, one event per line
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ts=2026-11-01T19:52:14-06:00 level=info component=sweep event=published stream="techy2493/Vanguard_Training" file="/srv/media/streams/…" verdict=encode
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- `ts` ISO-8601 with offset · `level` info|warn|error · `component` dumpd|sweep|vgdeband|deploy|on-ready · `event` a verb/noun in snake_case · then `key=value`, values with spaces or quotes double-quoted.
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- Same key means the same thing everywhere: `stream` (user/Title), `user`, `file`, `folder`, `rev`, `ip`, `reason`.
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- Implemented by: `log()` in `bin/dumpd.py`, `vglog` in `bin/normalize-sweep.sh` and `bin/vgdeband.sh`, `log()` in `deploy.sh` (`msg=` only), `bin/mtx-on-ready.sh` (MediaMTX prefixes its own path/time).
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Events today: dumpd `publish_allow publish_deny dump clips_setup quota_paused quota_resumed quota_* deploy_* bot_deploy_start bot_deploy_exit bot_deploy_bad_signature bot_deploy_refused bot_env_applied bot_env_failed`;
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sweep `verdict timecode deband fill_gaps published done failed skip`; vgdeband `deband done failed skip`; hook `mirror`.
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A future alert script watches `level=error`, `event=failed`, `event=publish_deny` bursts, `event=quota_paused`, plus disk.
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## Third-party formats a collector must parse
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| source | format | stage |
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|---|---|---|
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| caddy | JSON (`logger`, `level`, `msg`; access logs: `request.*`, `status`, `request.headers.X-Authentik-Username`) | json |
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| authentik | JSON (`event`, `user`, `action`) | json |
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| syncthing | key=value after a `date time:` prefix (`folder.id=… log.pkg=model`) | logfmt |
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| mediamtx | `YYYY/MM/DD HH:MM:SS LVL [component] [session|path x] message` | one regex → component, id, msg |
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| jellyfin | `[HH:MM:SS.mmm] [LVL] [thread] Logger.Class: message` + stack-trace continuation lines | **multiline** (join lines not starting with `[`) then regex |
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| gitea, mariadb, copyparty | plain text | level regex only |
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## Caddy access logs
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On for every site block (`CADDY_LOG` in `configure.py`): JSON to stderr; `Cookie`, `Authorization` and
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`X-Stream-Auth` request headers are deleted before logging, the `X-Authentik-*` identity headers are kept — that is the
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"who downloaded what" audit trail for the files host.
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## Retention
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One global retention period in VictoriaLogs (`-retentionPeriod`); start at 30 days and watch the disk. Keeping
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`auth` and `deploy` longer than the rest would need separate tenants, which is not worth it unless an audit does.
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## Wiring sketches (not deployed; pick one later)
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- **Grafana + Loki**: `alloy` container with `loki.source.journal` + `loki.source.docker` (labels from the container
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labels above) → `loki` on loopback → `grafana` behind Authentik OIDC (third provider, like Jellyfin/Gitea).
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Metrics: Alloy scrapes the four taps above → Prometheus or VictoriaMetrics, same Grafana.
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- **VictoriaLogs** (chosen): single container on `127.0.0.1:9428`, run with `-http.pathPrefix=/logs`; Vector
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ships journald and the Docker logs. Its built-in UI sits behind the Caddy forward-auth gate on `diag.BASE`
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(`media-admins`). VictoriaMetrics beside it would consume the four metric taps.
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- **Netdata**: single container, host + container metrics and alerts (Discord) out of the box, journald viewer;
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behind the Caddy gate. Weakest at log search.
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- **ELK**: rejected — JVM heap and index disk on a box doing x264; our data is structured records (→ MariaDB) and a
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single host's logs.
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