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ci: measure what the CI cache bucket actually stores - #13670
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r2-cache.sh only restores and saves. Nothing deletes, the stale-run janitor only cancels runs, and lifecycle rules exist solely for the per-run canary bucket. A save also skips re-upload when the key already exists, so an object's mtime never refreshes. Archive keys embed a content hash, so every dependency bump mints a new object and keeps the old one forever. Nobody can say how much that costs today, which makes picking a retention window guesswork. Add a read-only census: it walks v1/ with ListObjectsV2, groups by <os>-<arch> namespace, and reports object counts, bytes, and the oldest entry per namespace. With --max-age-days it also models what an age-based rule would reclaim, without deleting anything. The model counts archives only. Expiring a pointer under latest/ costs a restore miss and nothing else, and pointers are negligible bytes, so counting them would overstate the saving. Objects whose timestamp will not parse are reported separately rather than assumed expired. This deliberately has no apply mode. Retention is a cost decision, and it should be made against measured bytes first. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThis change adds a read-only R2 cache census script, tests its pagination and reporting behavior, and runs the tests in the CI guard workflow. ChangesR2 cache census
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant CI
participant CensusTests
participant R2Census
participant R2Endpoint
CI->>CensusTests: Run census test suite
CensusTests->>R2Census: Load and exercise census functions
R2Census->>R2Endpoint: Send signed ListObjectsV2 requests
R2Endpoint-->>R2Census: Return paginated object data
R2Census-->>CensusTests: Return census and reclaim results
CensusTests-->>CI: Report test status
Merge Risk: 🔵 Low · up to The census can understate storage usage or misrepresent unknown object ages. These bounded reporting issues should be corrected before using its output for retention decisions. 🚥 Pre-merge checks | ✅ 24 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (24 passed)
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In `@scripts/ci/r2_cache_census.py`:
- Around line 125-129: Propagate incomplete-listing state through parse_page and
collect: return truncation from parse_page, have collect return objects plus a
completion flag, and mark repeated-token or missing-token termination as partial
while preserving warnings. Update the affected test contract, pass the flag into
the summary, and have the rendered report identify partial counts as a lower
bound.
- Line 162: Represent a namespace with no readable timestamps using None instead
of 0.0: initialize oldest_days accordingly, update it safely when parsing a
valid age in the bucket aggregation logic, and render “oldest unknown” rather
than formatting None as 0d in the report output.
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.github/workflows/ci-guards.ymlscripts/ci/r2_cache_census.pytests/test_ci_r2_cache_census.py
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Two paths ended the listing early while main still printed totals, percentages and a reclaim estimate that read as complete: parse_page dropped the truncation flag when a truncated page carried no continuation token, and collect returned after a repeated token. The whole point of the tool is a cost decision made against measured bytes, so an undercount that looks authoritative is the worst failure it can have. parse_page now returns truncation alongside the token, collect reports whether the walk finished, the header says INCOMPLETE and labels the totals as lower bounds, and the exit status is nonzero so a partial walk cannot pass as success in a script. Also stop reporting an unknown age as "oldest 0d". oldest_days started at zero and objects with unparseable timestamps skip the update, so a namespace with no readable timestamps read as brand-new data. It is None now and renders as "oldest unknown". Both reported by CodeRabbit on #13670. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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tests/test_ci_r2_cache_census.py arrived with #13670 and has no entry, so the unconditional "test exists but has no execution registry entry" check fails and guards / workflow-guard-tests / preflight is red on main for every pull request, whatever it touched. ci-guards.yml runs it in the ci group, which is Linux, so it takes the linux-guard lane. Inserted in alphabetical position within the manifest's sorted tail, beside test_ci_r2_artifact.py. This is the second time today the registry has gone stale within an hour of being fixed: the check that stops a *new* test entering the legacy lane needs --base-sha and only runs on pull requests, while the check that a test is registered at all runs everywhere and reddens main the moment an unregistered test lands. Worth considering whether the registry entry should be generated from ci-guards.yml rather than hand-maintained alongside it. Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
This was referenced Sep 22, 2026
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Nothing in this repo deletes from the CI cache bucket.
scripts/ci/r2-cache.shhasrestoreandsaveand no delete path,ci-stale-run-janitor.ymlcancels stale runs but never touches R2 objects, and lifecycle rules exist only for the per-run canary bucket. Archive keys underv1/<os>-<arch>/objects/embed a content hash, so every dependency bump mints a new object and keeps the old one indefinitely.After this change you can measure that footprint before deciding anything about it:
It walks
v1/withListObjectsV2and prints per-namespace object counts, bytes, and oldest entry.--max-age-daysadditionally models what an age-based rule would reclaim. It never writes to the bucket.One mechanism detail worth knowing before anyone writes a retention rule:
saveskips re-upload when the key already exists, so an object'sLastModifiednever refreshes. An age rule would therefore eventually evict still-hot caches. That is survivable, becauser2-cache.shtreats every restore error as a miss and re-saves on 404, but it makes the window a cold-build tradeoff rather than free cleanup. The model counts archives only: expiring alatest/pointer costs a restore miss and negligible bytes, so counting pointers would overstate the saving.There is deliberately no apply mode. Retention is a cost decision and should be made against measured bytes.
Validation
python3 tests/test_ci_r2_cache_census.pypasses: 11 tests covering pagination, a repeated continuation token, a truncated page with no token, archive/pointer accounting, the age model, unparseable timestamps, and read-only enforcement. Registered inci-guards.ymlunder thecigroup so guard ownership resolves. The fulltests/test_ci_*sweep adds no failures;test_ci_change_areas.py,test_ci_sparkle_build_monotonic.sh, andtest_ci_universal_release_settings.shfail identically on cleanmainin a Linux sandbox, where they cannot reachghor macOS.Example output below is rendered from synthetic objects in a local harness, to show the format. It is not a measurement of the real bucket:
Remaining gap
The bucket has not been measured yet: that needs a run with the cache credentials, which this PR does not perform. A lifecycle rule configured by hand in the Cloudflare dashboard would not be visible to this tool or to the audit above, so the census run is also what would confirm whether cleanup already exists out of band.
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