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pixa/TODO.md
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Export cache, eviction, upstream and transform metrics (closes #85)
New pixa_ metrics, none with labels:
- source cache hits and misses, counted once per variant made or checked;
  a source whose cached file cannot be used is a miss
- cache usage and limit gauges; usage is set each time eviction reads it
- eviction count and bytes, from the size_bytes the deleted row returns
- upstream fetch duration histogram and fetch error counter
- transform duration histogram and an in-progress gauge, both including
  the wait for a processing slot

Removing a damaged file during reconciliation is not counted as an
eviction. README lists every metric; the metrics config comment now says
the pixa_ metrics are measured whether or not /metrics is served.

Model: opus-5-5
2026-11-11 14:32:38 +00:00

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Markdown

# Workflow
- branch per issue from `next`
- do the work in Next Step
- delete Next Step from `TODO.md`
- `TODO.md` merges with git's union merge (`.gitattributes`), which never
reports a conflict: read the merged entries after every merge or rebase
- move the top item of Future Steps into Next Step
- commit (`TODO.md` changes in the same commit as the work)
- open a PR based on `next`
- an independent reviewer who did not write the change gates it
- the manager squash-merges the PR into `next` once review passes
- `next` stays green and mergeable to `main` at any time; only the owner merges
`next` into `main`, via the single milestone PR
- push
# Status
pre-1.0. The `1.0.0` milestone is in progress.
# Next Step
P2: security: per-origin rate limiting
# Future Steps
- P2: HTTP response handling
- Last-Modified headers
- P2: operational
- measure the 1k to 5k req/s target with `script/loadtest` on a machine not
shared with other work