ipx/.claude/skills/ipx-prod-check/SKILL.md

---
name: ipx-prod-check
description: Look for problems in production ipx (the iPX container on Tower) from its logs in Loki and its traces in Tempo, and file what is found as Gitea issues. Use when asked to check on production, look for issues or errors in ipx, see why something is slow or failing in production, review the logs, or investigate a report about the live site.
---

# Checking production ipx

Production logs one JSON object a line (`IPX_LOG_FORMAT=json`), which Alloy ships to Loki under
`{container="iPX"}`, and sends traces to Tempo tagged
`resource.deployment.environment.name="production"`. Anything without that tag is a daemon run by
hand, not production. Loki and Tempo publish no query port, so use the script beside this file:

```sh
Q=.claude/skills/ipx-prod-check/query.py
$Q logs    '<LogQL>'           [since]   # lines, newest first (500 at most)
$Q metric  '<LogQL metric>'    [since]   # $range becomes `since`
$Q traces  '<TraceQL>'         [since]   # slowest first
$Q trace   <trace id>                    # one trace as a tree, with its log lines
```

`since` is `1h`, `24h`, `7d`. Default to `24h`; widen it to see whether something is new.

## What the log carries

Every line has `timestamp`, `level`, `message` and `target`; lines inside a span have `span` (the
innermost: `{"name":"feed","feed":"x"}`). Loki's `| json` flattens it to `span_name`, `span_feed`.
Lines inside a traced span, requests and scans, also carry `trace_id` and `span_id`: give the
`trace_id` to `$Q trace` to see the whole request or scan. (From 2026-09-29 16:30 UTC; before that,
lines had no trace id, the access log's time was `ms`, and each event was logged twice, words under
`ipx::scan` and fields under `ipx::io`.)

| target | fields | what |
|---|---|---|
| `ipx::http` | `method`, `path`, `route`, `status`, `duration_ms` | one per web request; `route` is the pattern, empty for an unrouted path |
| `ipx::scan` | `ev` and the event's own: `feed`, `new`, `downloaded`, `failed`, `bytes`, `msg`, `url`, `feeds`, `reason`; on a failure `error.type` and, from an HTTP error, `http.response.status_code` | the daemon's events, one line each, in words; warnings are feed and download failures |
| `ipx::io` | `ev`, `feeds`, `pending`, `downloaded` on the `status` reply | commands arriving (`-> {...}`) and the healthcheck's answer |
| `ipx` | message, sometimes fields | start-up, shutdown, account and config messages |

Events (`ev`): `feed_start`, `feed_done` (new, downloaded, failed, torrents), `feed_skip` (not due,
routine), `feed_error` (msg), `download_done` (bytes), `download_error` (msg, url),
`torrent_deferred`, `reaped`, `scan_done` (feeds checked), `reap_done`, `status` (feeds, pending,
downloaded: the healthcheck's, every 30s), `error` (msg).

`error.type` is the HTTP status (`404`, `503`) or one of `dns`, `redirect_loop`, `timeout`, `tls`,
`not_a_feed`, `site_message`, `connect`, `parse`, `other`; Loki's `| json` names it `error_type`.

Filter on the text before `| json` where you can (`|= "\"ev\":\"feed_error\""`): it is much
cheaper than parsing every line. Lines before 2026-09-29 14:00 UTC are text, not JSON, and
`| json | __error__=""` drops them.

## The checks

Run these, then read the lines behind whatever stands out. Most of the time is in the reading:
a count says something happened, the lines and traces say why.

1. **Warnings and errors, grouped.** What went wrong, how often, and since when.
   ```
   $Q metric 'sum by (target, message) (count_over_time({container="iPX"} | json | __error__="" | level=~"WARN|ERROR" [$range]))'
   ```
   Feed and download failures name the feed in the message; group them in the next check instead.
2. **Failing feeds and downloads.**
   ```
   $Q metric 'sum by (feed, error_type) (count_over_time({container="iPX"} |= "\"ev\":\"feed_error\"" | json | __error__="" [$range]))' 7d
   $Q metric 'sum by (feed, error_type) (count_over_time({container="iPX"} |= "\"ev\":\"download_error\"" | json | __error__="" [$range]))' 7d
   ```
   Tell the publisher's problems from ipx's. A 404, 410, DNS failure or 503 from the feed's own
   server is the publisher (worth saying, since the feed may have moved; one issue for a feed
   that has been dead for days, not for a 503 once). A parse error on a feed that loads in a
   browser, a redirect loop ipx should follow, or the same failure on many feeds at once is ipx.
3. **Server errors and slow requests.**
   ```
   $Q metric 'sum by (method, route, status) (count_over_time({container="iPX"} |= "\"target\":\"ipx::http\"" | json | __error__="" | status >= 500 [$range]))'
   $Q metric 'topk(10, quantile_over_time(0.95, {container="iPX"} |= "\"target\":\"ipx::http\"" | json | __error__="" | route != "" | route != "/api/events" | unwrap duration_ms [$range]) by (method, route))'
   ```
   Any 5xx is worth a look. 401s are people signing in, not a problem unless one address is
   hammering. For a slow route, find its traces (check 5) and see which span holds the time.
4. **Is the worker keeping up?** Scans should finish regularly, the queue should drain, and the
   daemon should not be restarting on its own.
   ```
   $Q metric 'sum(count_over_time({container="iPX"} |= "\"ev\":\"scan_done\"" [$range]))' 6h
   $Q logs '{container="iPX"} |= "\"ev\":\"status\"" | json | line_format "{{.timestamp}} pending={{.pending}} downloaded={{.downloaded}}"' 6h
   $Q logs '{container="iPX"} |= "daemon started"' 7d
   ```
   A `daemon started` not matched by a deploy (see `git log` and the image's build time) is a
   crash or an OOM kill: check `docker inspect iPX -f '{{.State.OOMKilled}} {{.RestartCount}}'`
   and the lines just before it. A pending count that only grows means downloads are not
   keeping up or not running.
5. **Slow and failed traces.**
   ```
   $Q traces '{resource.deployment.environment.name="production" && duration > 5s}'
   $Q traces '{resource.deployment.environment.name="production" && status = error}'
   $Q trace <id>
   ```
   Scans (`scan`) are long by nature, since they fetch many feeds one after another: look for one
   `feed` or `fetch` span holding most of it, or a `download` far slower than its size explains.
   A web request over a second is worth a look; the trace shows whether the time is in the
   handler or a scan it waited on.

Also check the container itself, since Loki cannot see a daemon that is not running:

```sh
docker ps --filter name=iPX --format '{{.Status}}'
docker logs --since 10m iPX 2>&1 | tail -5
```

`docker logs` and `docker exec iPX ipx ...` are fine. Do not query production's Postgres
directly: ask the user if a question needs the database.

## What to do with what you find

Follow the repository's rules in CLAUDE.md: **every problem found gets a Gitea issue**, with a
closed stdin and a timeout on `tea`. Before filing, list the open issues and do not file one
twice; comment on the existing issue with the new evidence instead.

```sh
R="--login git.sdf1.net --repo rays/ipx"
t() { timeout 30 /src/tea "$@" < /dev/null; }
t issues list $R --state open
t issues create $R -t "<what is wrong, as the user would notice it>" -L bug -d "<what, where, since when, how often, the query or trace id that shows it>"
```

Put in each issue what would let someone pick it up cold: the LogQL or TraceQL that shows it, a
trace id, the first time it was seen and how often. A publisher's dead feed is worth one issue
saying so (the user may want to unsubscribe or find its new address); a single 503 is not.

Finish with a short report to the user: what is healthy, what is wrong (with the issue numbers),
and anything you could not tell from logs and traces alone. Do not fix things unless asked; the
check is for finding them.

## When the checks come back empty

Check that there is data before concluding all is well: `$Q metric 'sum(count_over_time({container="iPX"} [1h]))' 1h`
should be in the hundreds or more. Nothing at all means Alloy is not shipping (it can take a few
minutes to pick up a container after a deploy), or the container is down.