Calculate the Four Keys from a release log
Compute basic DORA-style delivery signals from a small set of deployment and incident events.
The team has a release log but no shared definition for the Four Keys. Define events consistently before interpreting trends. Changing metric boundaries to make a dashboard look better turns delivery data into theater. Deployment frequency Count successful production deployments in the period: 10 deployments in 7 days. Use production-facing deploys, not every CI run or staging push. Lead time For each change, measure from agreed start event to production deploy; use median or distribution, not only average. Commit-to-prod and merge-to-prod are both usable if named consistently. Change failure rate 2 deployments required rollback, hotfix, or flag disable out of…
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