apppack-stats 0.4.0

Live response-time stats from streamed AppPack web logs.

apppack-stats

Live response-time stats from streamed AppPack web logs.

apppack-stats shells out to apppack logs --raw --follow for the app you name, parses the JSON request lines, and renders a live Textual data table grouped by (method, normalized path). Click any column header to re-sort by it; click again to flip the direction.

Slowest endpoints — 1842/1903 lines parsed, 47s elapsed
┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━━━━┳━━━━━┓
┃ Method ┃ Path                          ┃ Count ┃ Avg ms ┃ p95 ms ┃ Max ms ┃ Err ┃
┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━━━━╇━━━━━┩
│ GET    │ /reports/<id>/export          │     7 │   1842 │   2210 │   2480 │     │
│ POST   │ /api/v1/orders                │    23 │    412 │    711 │    980 │   2 │
│ GET    │ /dashboard                    │    91 │    188 │    320 │    640 │     │
└────────┴───────────────────────────────┴───────┴────────┴────────┴────────┴─────┘

Usage

No install required — run it straight from PyPI with uv:

uvx apppack-stats <appname>

Press q (or Ctrl+C) to stop.

Keys

Key	Action
Click column header	Sort by that column (click again to reverse)
n	Toggle URL normalization on/off
q	Quit

The AppPack CLI must be on your PATH and authenticated against the account that owns the app.

Options

Flag	Default	Notes
--refresh SEC	1.0	Seconds between redraws
--start DUR	5m	How far back to seed history (30m, 2h, 1d, …)
--prefix STRING	none	AppPack log-group prefix filter — see note below
--no-normalize	off	Group by raw path instead of normalizing IDs
-o, --output PATH	none	On exit, write the final stats to PATH as CSV (- for stdout). Rows are sorted by whichever column was active in the UI when you quit.

The table fills the terminal and scrolls when there are more rows than fit.

A note on --prefix

apppack logs --prefix filters on AppPack's underlying CloudWatch log-group names, which don't always begin with the service name shown in the rendered (web/web/<task>) label. Different AppPack apps use different log-group naming conventions, so a fixed default like web silently drops everything for some apps. By default apppack-stats passes no prefix and lets the parser filter — only access-log JSON lines (those with method, path, status, response_time_us) are counted; everything else is skipped.

URL normalization

By default, paths are normalized so that /orders/12345 and /orders/67890 share a row as /orders/<id>. UUIDs become /<uuid>, long hex hashes become /<hash>. Pass --no-normalize to keep raw paths.

Adding support for another log shape

Access-log shapes live in src/apppack_stats/extractors.py. Append a new LogShape(...) to the SHAPES list — pick a time_field key that doesn't collide with existing ones, set time_unit to "us", "ms", or "s", and the parser will pick it up automatically.