Overview
Annotated
GitHub Actions — CI/CD platform
repo event → plan job DAG → match to ephemeral runners → stream logs + report status · 1,740 job-starts/s peak · 310K concurrent runners · 875 MB/s live logs
arrows
0/20
cards
16
letters
A–N
happy-path
side-effect
failure-comp
new-infra
▶
BOTE — canonical numbers
(every N- chip in the rail links here)
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Failure playbook (A–N)
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What breaks first · interview framing