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awesome-copilot/skills/github-actions-efficiency/references/reporting.md
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mutl3y 12666c97ee 2 new efficiency skills to reduce cost and wasted cpu cycles in github actions and codespaces (#1766)
* fresh pull of updated stage with 2 skills and updated README only

* adjusted skills after feedback and used skill analyser to review

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Co-authored-by: Mark Heynes <mutl3y@heynes.biz>
2026-05-25 11:05:10 +10:00

1.5 KiB

Efficiency Reporting and Follow-Up Review

Load this reference when the user asks what changed, wants a before/after report, or asks for another pass over remaining expensive jobs.

Reporting Rules

  • Separate expected savings from measured savings.
  • Do not claim exact time or cost savings without before/after run data.
  • Call out confounders such as cache warm-up, changed matrix breadth, runner changes, or unusually small PRs.

Use this phrasing when data is incomplete:

I can report the efficiency mechanisms that changed, but I cannot honestly claim exact minutes saved without comparing before/after GitHub Actions runs.

What To Measure

Gather:

  1. A baseline sample before the change
  2. A post-change sample after caches warm
  3. Per-workflow or per-job duration comparisons
  4. Avoided runs, skipped jobs, or avoided matrix legs

Always separate:

  • PR wall-clock time
  • Total runner time across jobs
  • Work avoided entirely

These answer different questions. A change can reduce runner spend without materially improving the fastest feedback path.

Follow-Up Review Pass

After the first round of fixes is validated, inspect the remaining expensive jobs:

  • Compare setup time versus execution time
  • Identify heavyweight wrapper actions and confirm what they really enforce
  • Review whether each matrix dimension still serves an active decision
  • Recheck after caches warm
  • Break down the dominant slow step before proposing further changes

Keep the follow-up compact. Report the next few highest-value opportunities, not a long wishlist.