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CI: Aggregate flake-regressions statistics - #728
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Each flake_regressions matrix job now collects the eval.timings files written by flake-regressions' eval-flake.sh (elapsed, user and kernel time, and maximum RSS of each flake evaluation) into a JSON file and uploads it as an artifact. A new flake_regressions_stats job downloads these, sums them per Nix configuration (lazy-trees = true/false, eval-cores = 24), and writes a table to the job summary. The aggregate is also uploaded as an artifact for comparing runs. Flakes that failed to evaluate are skipped. Jobs that needed a retry are marked, since the retry re-evaluates everything against an empty store, which makes their timings incomparable. Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
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📝 Walkthrough
Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 1 files. (1 skipped: 1 … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title "CI: Aggregate flake-regressions statistics" matches the main change. The PR adds a flake_regressions_stats job and maintainers/flake-regression-stats.py, which aggregate per-job timing and … Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Full details: Title check
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Explanation
The title "CI: Aggregate flake-regressions statistics" matches the main change. The PR adds a flake_regressions_stats job and maintainers/flake-regression-stats.py, which aggregate per-job timing and memory statistics by Nix configuration. The title is specific and concise. It omits the secondary changes, such as setting eval-cores = 1 and adding cache-size reporting, which is acceptable for a title.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 1 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @.github/workflows/build.yml:
- Line 285: Update the flake_regressions workflow so a failed retry still allows
statistics collection and aggregation: disable matrix fail-fast, run the
collector after the test step succeeds or fails unless canceled, and upload its
artifact when collection succeeds. Adjust the flake_regressions_stats condition
to run after matrix failures while excluding skipped or canceled runs.
Review comments at @maintainers/flake-regression-stats.py:
- Around line 37-38: Update the collection logic using flake_dir so a stale
“failed” marker does not exclude an evaluation that ultimately succeeded on
retry; determine success from the final evaluation result or clear the marker
after a successful retry before checking it.
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The success job downloads all artifacts of the run and moves each one's *.xz into ./artifacts. The flake regression statistics artifacts contain no tarballs, so with nullglob mv got only a destination argument and failed. Skip such artifacts. Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
The aggregate JSON file now contains, for each configuration, the totals and the full statistics of every job, so that slow flakes can be found from a single artifact. The summary additionally lists the 10 slowest flakes (by elapsed time) per configuration. Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
The Determinate Nix installer now sets eval-cores = 0, so the lazy-trees configurations were also evaluating in parallel. Set eval-cores = 1 in nix.conf; the eval-cores = 24 configuration overrides it via NIX_CONFIG. Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
The cache directory is on a Namespace cache volume that persists across runs, so its size may affect evaluation performance. Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
Motivation
We want to track the resource usage (elapsed/user/kernel time, memory) of flake-regressions runs over time, but the per-flake numbers are spread over 42 matrix jobs.
Implementation
Each
flake_regressionsjob collects theeval.timingsfiles into a JSON artifact. A newflake_regressions_statsjob aggregates them per Nix configuration usingmaintainers/flake-regression-stats.py, writes a table to the job summary, and uploads the aggregate as an artifact.The
flake_regressionsjobs now seteval-cores = 1, since the Determinate Nix installer enables parallel evaluation by default. Previously thelazy-treesconfigurations were silently evaluating in parallel, which made them incomparable with theeval-cores = 24configuration.🤖 Generated with Claude Code
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